#399

AGENTS.md

@@ -211,6 +211,13 @@ records.each {
 - In TypeScript and TSX, block bodies for components, functions, callbacks,
   `if`, `try`, `catch`, `finally`, loops, and JSX nesting use 2 spaces per
   level.
+- In TypeScript and TSX, put the opening brace of `try`, `catch`, and
+  `finally` blocks on the next line at the same indentation as the keyword.
+- Do not indent the opening `{` one level deeper than `try`, `catch`, or
+  `finally`.
+- Indent the block body 2 spaces deeper than the keyword and opening brace.
+- Put the closing `}` on its own line at the same indentation as the keyword.
+- Do not write `try {`, `catch {`, or `finally {`.
 - In TypeScript and TSX, use 4-space continuation indentation for wrapped
   expressions, arguments, conditions, arrays, object literals, JSX
   attributes, and similar continuations.
@@ -274,6 +281,10 @@ case 'no':
 - In TypeScript and TSX, use `value == null` and `value != null` as the
   default nullish checks. Do not use `=== null`, `=== undefined`,
   `!== null`, or `!== undefined`.
+- In JavaScript, JSX, TypeScript, and TSX, never use `_1`, `_2`, or similar
+  Ruby-style numbered parameter names. Reserve numbered parameters for Ruby.
+  Use a meaningful callback parameter name such as `row`, `item`, `value`,
+  `entry`, or `result`.
 - If code appears to need a distinction between `null` and `undefined`, treat
   that as a design smell and revise the logic to avoid the distinction.
   External library APIs that explicitly require distinguishing the two are the
@@ -578,6 +589,13 @@ and layout reuse, follow `frontend/AGENTS.md`.
   declarations, unless imports, exports, or file boundaries make that awkward.
 - In TSX, use 2-space block indentation and 4-space continuation
   indentation.
+- In TypeScript and TSX, put the opening brace of `try`, `catch`, and
+  `finally` blocks on the next line at the same indentation as the keyword.
+- Do not indent the opening `{` one level deeper than `try`, `catch`, or
+  `finally`.
+- Indent the block body 2 spaces deeper than the keyword and opening brace.
+- Put the closing `}` on its own line at the same indentation as the keyword.
+- Do not write `try {`, `catch {`, or `finally {`.
 - In TypeScript and TSX, convert every complete leading run of 8 spaces to a
   tab character.
 - A leading tab is exactly equivalent to 8 leading spaces.
@@ -628,6 +646,22 @@ and layout reuse, follow `frontend/AGENTS.md`.
   single physical line.
 - Always add braces around `if`, `else`, or `for` bodies when the body spans
   two or more physical lines, even if it is one statement.
+- `try` / `catch` / `finally` brace placement example:
+
+```ts
+try
+{
+  doWork ()
+}
+catch
+{
+  recover ()
+}
+finally
+{
+  cleanUp ()
+}
+```
 - Do not use a leading semicolon for expression statements such as
   `;([...]).forEach(...)`; rewrite the expression to avoid ASI hazards
   explicitly, for example with `void`.

backend/app/models/post.rb

@@ -1,11 +1,23 @@
 class Post < ApplicationRecord
+  require 'date'
   require 'mini_magick'
   require 'stringio'
 
+  class RemoteThumbnailFetchFailed < StandardError; end
+
+  ORIGINAL_CREATED_INVALID_MESSAGE = 'オリジナルの作成日時の形式が不正です．'.freeze
+  ORIGINAL_CREATED_MINUTE_PRECISION_MESSAGE =
+      'オリジナルの作成日時は分単位で入力してください．'.freeze
+  ORIGINAL_CREATED_ORDER_MESSAGE = 'オリジナルの作成日時の順番がをかしぃです．'.freeze
+  ORIGINAL_CREATED_MINIMUM_RANGE_MESSAGE =
+      'オリジナルの作成日時の範囲は1分以上必要です．'.freeze
+
   def self.resized_thumbnail_attachment(upload)
     upload.rewind
     image = MiniMagick::Image.read(upload.read)
-    image.resize '180x180'
+    image.resize '180x180^'
+    image.gravity 'Center'
+    image.extent '180x180'
     image.format 'jpg'
 
     { io: StringIO.new(image.to_blob),
@@ -118,7 +130,11 @@ class Post < ApplicationRecord
           '%d:%02d' % [min, s]
         end
 
-    remainder_ms.positive? ? "#{ base }.#{ remainder_ms.to_s.rjust(3, '0') }" : base
+    if remainder_ms.positive?
+      "#{ base }.#{ remainder_ms.to_s.rjust(3, '0') }"
+    else
+      base
+    end
   end
 
   def snapshot_parent_post_ids = parents.order(:id).pluck(:id)
@@ -140,19 +156,36 @@ class Post < ApplicationRecord
     thumbnail.attach(self.class.resized_thumbnail_attachment(StringIO.new(thumbnail.download)))
   end
 
+  def attach_thumbnail_from_url! raw_url
+    response = Preview::ThumbnailFetcher.fetch_image_response(raw_url)
+    thumbnail.attach(
+        self.class.resized_thumbnail_attachment(
+            StringIO.new(response.body)))
+  rescue Preview::UrlSafety::UnsafeUrl,
+         Preview::ThumbnailFetcher::GenerationFailed,
+         Preview::HttpFetcher::FetchFailed,
+         Preview::HttpFetcher::FetchTimeout,
+         Preview::HttpFetcher::ResponseTooLarge,
+         MiniMagick::Error => e
+    raise RemoteThumbnailFetchFailed, e.message
+  end
+
   private
 
   def validate_original_created_range
-    f = original_created_from
-    b = original_created_before
-    return if f.blank? || b.blank?
+    return if skip_original_created_validation?
 
-    f = Time.zone.parse(f) if String === f
-    b = Time.zone.parse(b) if String === b
-    return if !(f) || !(b)
+    f = parse_original_created_value(:original_created_from)
+    b = parse_original_created_value(:original_created_before)
+    return if f.nil? || b.nil?
 
-    if f >= b
-      errors.add :original_created_at, 'オリジナルの作成日時の順番がをかしぃです．'
+    if b <= f
+      errors.add :original_created_at, ORIGINAL_CREATED_ORDER_MESSAGE
+      return
+    end
+
+    if b - f < 1.minute
+      errors.add :original_created_at, ORIGINAL_CREATED_MINIMUM_RANGE_MESSAGE
     end
   end
 
@@ -175,4 +208,128 @@ class Post < ApplicationRecord
 
     self.url = PostUrlNormaliser.normalise(url) || url.strip
   end
+
+  def parse_original_created_value field
+    raw_value = public_send("#{ field }_before_type_cast")
+    value = public_send(field)
+    return nil if raw_value.blank? && value.blank?
+
+    time =
+        case raw_value
+        when String
+          parse_original_created_string(raw_value)
+        when Time, ActiveSupport::TimeWithZone
+          raw_value.in_time_zone
+        else
+          value&.in_time_zone
+        end
+    if time.nil?
+      errors.add field, ORIGINAL_CREATED_INVALID_MESSAGE
+      return nil
+    end
+    unless minute_precision_time?(time)
+      errors.add field, ORIGINAL_CREATED_MINUTE_PRECISION_MESSAGE
+      return nil
+    end
+    time
+  end
+
+  def parse_original_created_string raw_value
+    value = raw_value.to_s.strip
+    return nil if value.blank?
+
+    if (match = value.match(/\A(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})\z/))
+      year = match[1].to_i
+      month = match[2].to_i
+      day = match[3].to_i
+      hour = match[4].to_i
+      minute = match[5].to_i
+      return nil unless valid_original_created_components?(year, month, day, hour, minute, 0)
+
+      return Time.zone.local(year, month, day, hour, minute)
+    end
+
+    match =
+        value.match(
+            /\A(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})/ \
+            '(?::(\d{2})(?:\.(\d+))?)?' \
+            '(Z|[+-]\d{2}:?\d{2})?\z/')
+    return nil if match.nil?
+
+    year = match[1].to_i
+    month = match[2].to_i
+    day = match[3].to_i
+    hour = match[4].to_i
+    minute = match[5].to_i
+    second = match[6]&.to_i || 0
+    fraction = match[7]
+    offset = match[8]
+    return nil unless valid_original_created_components?(year, month, day, hour, minute, second)
+    return nil if offset.present? && !(valid_original_created_offset?(offset))
+
+    if offset.present?
+      return Time.new(
+          year,
+          month,
+          day,
+          hour,
+          minute,
+          second + Rational(parse_original_created_nanoseconds(fraction), 1_000_000_000),
+          normalise_original_created_offset(offset)).in_time_zone
+    end
+
+    Time.zone.local(
+        year,
+        month,
+        day,
+        hour,
+        minute,
+        second).change(nsec: parse_original_created_nanoseconds(fraction))
+  rescue ArgumentError, TypeError
+    nil
+  end
+
+  def minute_precision_time? value
+    value.sec.zero? && value.nsec.zero?
+  end
+
+  def valid_original_created_components? year, month, day, hour, minute, second
+    return false unless Date.valid_date?(year, month, day)
+    return false unless hour.between?(0, 23)
+    return false unless minute.between?(0, 59)
+    return false unless second.between?(0, 59)
+
+    true
+  end
+
+  def valid_original_created_offset? value
+    match = value.match(/\A([+-])(\d{2}):?(\d{2})\z/)
+    return true if value == 'Z'
+    return false if match.nil?
+
+    hours = match[2].to_i
+    minutes = match[3].to_i
+    hours.between?(0, 23) && minutes.between?(0, 59)
+  end
+
+  def parse_original_created_nanoseconds value
+    return 0 if value.blank?
+
+    digits = value[0, 9].ljust(9, '0')
+    Integer(digits, 10)
+  end
+
+  def normalise_original_created_offset value
+    return '+00:00' if value == 'Z'
+
+    value.match?(/\A[+-]\d{2}:\d{2}\z/) ? value : "#{ value[0, 3] }:#{ value[3, 2] }"
+  end
+
+  def skip_original_created_validation?
+    return false if new_record?
+    return false if will_save_change_to_original_created_from?
+    return false if will_save_change_to_original_created_before?
+
+    true
+  end
 end

backend/app/services/post_creator.rb

@@ -1,9 +1,12 @@
 class PostCreator
   class VideoMsParseError < ArgumentError; end
 
+  attr_reader :field_warnings
+
   def initialize actor:, attributes:
     @actor = actor
     @attributes = attributes.symbolize_keys
+    @field_warnings = { }
   end
 
   def create!
@@ -13,8 +16,7 @@ class PostCreator
                     uploaded_user: @actor,
                     original_created_from: @attributes[:original_created_from].presence,
                     original_created_before: @attributes[:original_created_before].presence)
-    thumbnail = @attributes[:thumbnail]
-    post.thumbnail.attach(Post.resized_thumbnail_attachment(thumbnail)) if thumbnail.present?
+    attach_thumbnail!(post)
 
     ApplicationRecord.transaction do
       post.save!
@@ -34,6 +36,21 @@ class PostCreator
 
   private
 
+  def attach_thumbnail! post
+    thumbnail = @attributes[:thumbnail]
+    if thumbnail.present?
+      post.thumbnail.attach(Post.resized_thumbnail_attachment(thumbnail))
+      return
+    end
+
+    thumbnail_base = post.thumbnail_base
+    return if thumbnail_base.blank?
+
+    post.attach_thumbnail_from_url!(thumbnail_base)
+  rescue Post::RemoteThumbnailFetchFailed => e
+    @field_warnings[:thumbnail_base] = [e.message]
+  end
+
   def tag_names = @attributes[:tags].to_s.split
 
   def parent_post_ids
@@ -58,8 +75,6 @@ class PostCreator
     duration = @attributes[:duration]
     return nil if duration.blank?
 
-    return duration.to_i if duration.is_a?(Numeric) && duration.to_i.positive?
-
     value = Tag.time_to_ms!(duration.to_s, tag_name: '動画時間')
     raise VideoMsParseError unless value.positive?
 

backend/app/services/post_import_previewer.rb

@@ -157,7 +157,15 @@ class PostImportPreviewer
 
   def initial_attributes row
     attributes = row[:attributes]&.stringify_keys || { }
-    FIELDS.to_h { |field| [field, attributes[field].to_s] }
+    FIELDS.to_h { |field|
+      value = attributes[field]
+      normalised =
+          if field == 'duration'
+            normalise_duration_attribute(value)
+          else
+            value.to_s
+          end
+      [field, normalised] }
   end
 
   def initial_provenance row
@@ -250,16 +258,26 @@ class PostImportPreviewer
   def sanitise_metadata_time value
     return nil unless value.is_a?(String)
 
-    time = Time.iso8601(value)
-    time.nsec.zero? ? time.iso8601 : time.iso8601(9)
+    Time.iso8601(value).in_time_zone.change(sec: 0, nsec: 0).iso8601
   rescue ArgumentError, TypeError
     nil
   end
 
   def sanitise_metadata_duration value
-    return nil unless value.is_a?(Numeric)
+    return nil unless value.is_a?(String)
 
-    value.positive? ? value.to_i : nil
+    value.presence
+  end
+
+  def normalise_duration_attribute value
+    return '' if value.nil?
+    return value if value.is_a?(String)
+
+    milliseconds = Integer(value, exception: false)
+    return value.to_s if milliseconds.nil? || milliseconds <= 0
+
+    seconds_string = (milliseconds / 1_000.0).to_s
+    seconds_string.end_with?('.0') ? seconds_string.delete_suffix('.0') : seconds_string
   end
 
   def preload_metadata! prepared_rows, fetch_metadata, metadata_cache, existing_posts, url_counts
@@ -460,7 +478,7 @@ class PostImportPreviewer
   def parse_duration value, errors
     return nil if value.blank?
 
-    value.is_a?(Numeric) ? value.to_i : Tag.time_to_ms!(value.to_s, tag_name: '動画時間')
+    Tag.time_to_ms!(value.to_s, tag_name: '動画時間')
   rescue Tag::SectionLiteralParseError
     errors[:video_ms] = ['動画時間の記法が不正です．']
     nil

backend/app/services/post_import_row_normaliser.rb

@@ -5,9 +5,10 @@ class PostImportRowNormaliser
     'thumbnail_base',
     'original_created_from',
     'original_created_before',
+    'duration',
     'tags',
     'parent_post_ids'].freeze
-  FLEXIBLE_FIELDS = ['duration', 'video_ms'].freeze
+  FLEXIBLE_FIELDS = ['video_ms'].freeze
   ATTRIBUTE_FIELDS = (STRING_FIELDS + FLEXIBLE_FIELDS).freeze
 
   def self.normalise! rows, allow_warning_fields: false

backend/app/services/post_import_runner.rb

@@ -36,8 +36,13 @@ class PostImportRunner
 
     attributes['tags'] = preview[:attributes]['tags']
     attributes['url'] = row['url']
-    post = PostCreator.new(actor: @actor, attributes:).create!
-    { source_row: row['source_row'], status: 'created', post: PostRepr.base(post) }
+    creator = PostCreator.new(actor: @actor, attributes:)
+    post = creator.create!
+    result = { source_row: row['source_row'], status: 'created', post: PostRepr.base(post) }
+    if creator.field_warnings.present?
+      result[:field_warnings] = creator.field_warnings
+    end
+    result
   rescue ActiveRecord::RecordInvalid => e
     existing_post = existing_post_for_race(row, e.record)
     if existing_post

backend/app/services/post_metadata_fetcher.rb

@@ -1,4 +1,5 @@
 require 'time'
+require 'date'
 
 class PostMetadataFetcher
   TIMESTAMP_PATTERN =
@@ -30,7 +31,7 @@ class PostMetadataFetcher
           Preview::KnownSiteExtractor.thumbnail_url(uri) || metadata[:image_url],
       original_created_from: serialise_time(created_range&.first),
       original_created_before: serialise_time(created_range&.last),
-      duration: duration&.to_f&.then { _1.positive? ? (_1 * 1_000).round : nil },
+      duration: serialise_duration(duration),
       tags: platform_tags.join(' ') }
   end
 
@@ -54,12 +55,16 @@ class PostMetadataFetcher
         when /\A(\d{4})-(\d{2})\z/
           year = Regexp.last_match(1).to_i
           month = Regexp.last_match(2).to_i
+          return nil unless month.between?(1, 12)
+
           from = Time.zone.local(year, month, 1)
           [from, from + 1.month]
         when /\A(\d{4})-(\d{2})-(\d{2})\z/
           year = Regexp.last_match(1).to_i
           month = Regexp.last_match(2).to_i
           day = Regexp.last_match(3).to_i
+          return nil unless Date.valid_date?(year, month, day)
+
           from = Time.zone.local(year, month, day)
           [from, from + 1.day]
         else
@@ -84,36 +89,76 @@ class PostMetadataFetcher
     second = match[6]&.to_i || 0
     fraction = match[7]
     offset = match[8]
-    whole_second = second + fractional_seconds(fraction)
-    from =
+    return nil unless valid_timestamp_components?(year, month, day, hour, minute, second)
+    return nil unless valid_offset?(offset)
+
+    nanoseconds = parse_nanoseconds(fraction)
+    timestamp =
         if offset.present?
-          Time.new(year, month, day, hour, minute, whole_second, parse_offset(offset)).in_time_zone
+          Time.new(
+              year,
+              month,
+              day,
+              hour,
+              minute,
+              second + Rational(nanoseconds, 1_000_000_000),
+              parse_offset(offset)).in_time_zone
         else
-          Time.zone.local(year, month, day, hour, minute, whole_second)
+          Time.zone.local(year, month, day, hour, minute, second).change(nsec: nanoseconds)
         end
+
+    from = timestamp.change(sec: 0, nsec: 0)
     before =
-        if fraction.present?
-          from + (10**(-fraction.length))
-        elsif match[6].present?
-          from + 1.second
-        elsif match[5].present?
-          from + 1.minute
-        else
+        if match[5].nil?
           from + 1.hour
+        else
+          from + 1.minute
         end
     [from, before]
   end
 
+  def self.parse_nanoseconds value
+    return 0 if value.blank?
+
+    digits = value[0, 9].ljust(9, '0')
+    Integer(digits, 10)
+  end
+
   def self.parse_offset value
     return '+00:00' if value == 'Z'
 
     value.match?(/\A[+-]\d{2}:\d{2}\z/) ? value : "#{ value[0, 3] }:#{ value[3, 2] }"
   end
 
-  def self.fractional_seconds value
-    return 0 if value.blank?
+  def self.serialise_duration value
+    seconds = Float(value)
+    return nil unless seconds.positive?
 
-    Rational(value.to_i, 10**value.length)
+    milliseconds = (seconds * 1_000).round
+    seconds_string = (milliseconds / 1_000.0).to_s
+    seconds_string.end_with?('.0') ? seconds_string.delete_suffix('.0') : seconds_string
+  rescue ArgumentError, TypeError
+    nil
+  end
+
+  def self.valid_timestamp_components? year, month, day, hour, minute, second
+    return false unless Date.valid_date?(year, month, day)
+    return false unless hour.between?(0, 23)
+    return false unless minute.between?(0, 59)
+    return false unless second.between?(0, 59)
+
+    true
+  end
+
+  def self.valid_offset? value
+    return true if value.nil? || value == 'Z'
+
+    match = value.match(/\A([+-])(\d{2}):?(\d{2})\z/)
+    return false if match.nil?
+
+    hours = match[2].to_i
+    minutes = match[3].to_i
+    hours.between?(0, 23) && minutes.between?(0, 59)
   end
 
   def self.serialise_time value
@@ -125,7 +170,10 @@ class PostMetadataFetcher
   private_class_method :platform_tags,
                        :original_created_range,
                        :parse_timestamp_range,
+                       :parse_nanoseconds,
                        :parse_offset,
-                       :fractional_seconds,
+                       :serialise_duration,
+                       :valid_timestamp_components?,
+                       :valid_offset?,
                        :serialise_time
 end

backend/app/services/preview/http_fetcher.rb

@@ -12,9 +12,7 @@ module Preview
 
     Response = Data.define(:body, :content_type, :url)
 
-    def self.fetch(raw_url,
-                   max_bytes: DEFAULT_MAX_BYTES,
-                   redirects: MAX_REDIRECTS)
+    def self.fetch(raw_url, max_bytes: DEFAULT_MAX_BYTES, redirects: MAX_REDIRECTS)
       uri, addresses = UrlSafety.validate(raw_url)
       response = request(uri, addresses.first, max_bytes)
 
@@ -69,9 +67,7 @@ module Preview
       log_failure(:timeout, url: uri&.to_s || raw_url, error: e.class.name, message: e.message)
       raise FetchTimeout, e.message
     rescue SocketError, SystemCallError, OpenSSL::SSL::SSLError, EOFError => e
-      log_failure(:network_error,
-                  url: uri&.to_s || raw_url,
-                  error: e.class.name,
+      log_failure(:network_error, url: uri&.to_s || raw_url, error: e.class.name,
                   message: e.message)
       raise FetchFailed, e.message
     end

backend/app/services/preview/thumbnail_fetcher.rb

@@ -25,6 +25,22 @@ module Preview
       fetch_image!(metadata[:image_url])
     end
 
+    def self.fetch_image_response(raw_url)
+      uri, = UrlSafety.validate(raw_url)
+      response = HttpFetcher.fetch(uri.to_s)
+      unless allowed_image_content_type?(response.content_type)
+        raise GenerationFailed, 'サムネール画像が見つかりませんでした．'
+      end
+
+      response
+    rescue HttpFetcher::FetchTimeout
+      raise
+    rescue HttpFetcher::ResponseTooLarge
+      raise
+    rescue HttpFetcher::FetchFailed
+      raise GenerationFailed, 'サムネール画像を取得できませんでした．'
+    end
+
     def self.title(raw_url)
       uri, = UrlSafety.validate(raw_url)
       HtmlMetadataExtractor.extract(
@@ -45,18 +61,7 @@ module Preview
     end
 
     def self.fetch_image!(url)
-      response = HttpFetcher.fetch(url)
-      unless allowed_image_content_type?(response.content_type)
-        raise GenerationFailed, 'サムネール画像が見つかりませんでした．'
-      end
-
-      response.body
-    rescue HttpFetcher::FetchTimeout
-      raise
-    rescue HttpFetcher::ResponseTooLarge
-      raise
-    rescue HttpFetcher::FetchFailed
-      raise GenerationFailed, 'サムネール画像を取得できませんでした．'
+      fetch_image_response(url).body
     end
 
     def self.niconico_thumbnail_url(uri)
@@ -70,16 +75,20 @@ module Preview
 
       xml.at_xpath('//thumbnail_url')&.text&.strip.presence
     rescue HttpFetcher::FetchFailed, HttpFetcher::FetchTimeout => e
-      Rails.logger.info("preview_niconico_getthumbinfo_fallback #{ { url: uri.to_s,
-                                                                     video_id:,
-                                                                     error: e.class.name,
-                                                                     message: e.message }.to_json }")
+      payload = {
+          url: uri.to_s,
+          video_id:,
+          error: e.class.name,
+          message: e.message }
+      Rails.logger.info("preview_niconico_getthumbinfo_fallback #{ payload.to_json }")
       nil
     rescue Nokogiri::XML::SyntaxError => e
-      Rails.logger.info("preview_niconico_getthumbinfo_fallback #{ { url: uri.to_s,
-                                                                     video_id:,
-                                                                     error: e.class.name,
-                                                                     message: e.message }.to_json }")
+      payload = {
+          url: uri.to_s,
+          video_id:,
+          error: e.class.name,
+          message: e.message }
+      Rails.logger.info("preview_niconico_getthumbinfo_fallback #{ payload.to_json }")
       nil
     end
 

backend/app/services/youtube/sync.rb

@@ -1,4 +1,3 @@
-require 'open-uri'
 require 'set'
 require 'time'
 
@@ -127,12 +126,12 @@ module Youtube
       return if post.thumbnail.attached?
       return if thumbnail_url.blank?
 
-      post.thumbnail.attach(
-          io:           URI.open(thumbnail_url),
-          filename:     File.basename(URI.parse(thumbnail_url).path),
-          content_type: 'image/jpeg')
-
-      post.resized_thumbnail!
+      post.attach_thumbnail_from_url!(thumbnail_url)
+    rescue Post::RemoteThumbnailFetchFailed => e
+      Rails.logger.info("youtube_sync_thumbnail_fetch_failed #{ { post_id: post.id,
+                                                                  thumbnail_url:,
+                                                                  error: e.class.name,
+                                                                  message: e.message }.to_json }")
     end
 
     def youtube_url_regexp id

backend/lib/tasks/sync_nico.rake

@@ -70,11 +70,17 @@ namespace :nico do
         unless post.thumbnail.attached?
           thumbnail_base = fetch_thumbnail.(post.url) rescue nil
           if thumbnail_base.present?
-            post.thumbnail.attach(
-                io:           URI.open(thumbnail_base),
-                filename:     File.basename(URI.parse(thumbnail_base).path),
-                content_type: 'image/jpeg')
             attrs[:thumbnail_base] = thumbnail_base
+            begin
+              post.attach_thumbnail_from_url!(thumbnail_base)
+            rescue Post::RemoteThumbnailFetchFailed => e
+              payload = {
+                  post_id: post.id,
+                  thumbnail_base:,
+                  error: e.class.name,
+                  message: e.message }
+              Rails.logger.info("nico_sync_thumbnail_fetch_failed #{ payload.to_json }")
+            end
           end
         end
 
@@ -82,7 +88,6 @@ namespace :nico do
         post_changed = post.changed?
         if post_changed
           post.save!
-          post.resized_thumbnail! if post.thumbnail.attached?
         end
       else
         post_created = true
@@ -91,13 +96,18 @@ namespace :nico do
         post = Post.new(title:, url:, thumbnail_base:, uploaded_user: nil,
                         original_created_from:, original_created_before:)
         if thumbnail_base.present?
-          post.thumbnail.attach(
-              io:           URI.open(thumbnail_base),
-              filename:     File.basename(URI.parse(thumbnail_base).path),
-              content_type: 'image/jpeg')
+          begin
+            post.attach_thumbnail_from_url!(thumbnail_base)
+          rescue Post::RemoteThumbnailFetchFailed => e
+            payload = {
+                post_id: nil,
+                thumbnail_base:,
+                error: e.class.name,
+                message: e.message }
+            Rails.logger.info("nico_sync_thumbnail_fetch_failed #{ payload.to_json }")
+          end
         end
         post.save!
-        post.resized_thumbnail!
         sync_post_tags!(post, [Tag.tagme.id, Tag.bot.id, Tag.niconico.id, Tag.video.id])
       end
 

backend/spec/models/post_spec.rb

@@ -1,4 +1,5 @@
 require 'rails_helper'
+require 'tempfile'
 
 RSpec.describe Post, type: :model do
   before do
@@ -65,4 +66,296 @@ RSpec.describe Post, type: :model do
       expect(post.errors.details.fetch(:url)).to include(error: :taken, value: post.url)
     end
   end
+
+  describe 'thumbnail processing' do
+    def image_blob(width:, height:, background:, draw: nil)
+      Tempfile.create(['post-thumbnail', '.png']) do |file|
+        MiniMagick::Tool::Convert.new do |convert|
+          convert.size "#{ width }x#{ height }"
+          convert.xc background
+          draw&.call(convert)
+          convert << file.path
+        end
+        File.binread(file.path)
+      end
+    end
+
+    def upload_for(blob)
+      StringIO.new(blob).tap(&:rewind)
+    end
+
+    def read_image(attachment)
+      blob =
+          attachment.is_a?(Hash) ? attachment.fetch(:io).read : attachment.download
+      MiniMagick::Image.read(blob)
+    end
+
+    def colour_at(image, x, y)
+      image.get_pixels.fetch(y).fetch(x)
+    end
+
+    def expect_green(pixel)
+      expect(pixel[1]).to be > pixel[0] + 40
+      expect(pixel[1]).to be > pixel[2] + 40
+    end
+
+    def expect_red(pixel)
+      expect(pixel[0]).to be > pixel[1] + 40
+      expect(pixel[0]).to be > pixel[2] + 40
+    end
+
+    def expect_blue(pixel)
+      expect(pixel[2]).to be > pixel[0] + 40
+      expect(pixel[2]).to be > pixel[1] + 40
+    end
+
+    describe '.resized_thumbnail_attachment' do
+      it 'centre-crops a wide image to 180x180 without distorting it' do
+        blob = image_blob(
+            width: 360,
+            height: 180,
+            background: 'red',
+            draw: -> convert {
+              convert.fill 'green'
+              convert.draw 'rectangle 90,0 269,179'
+            })
+
+        resized = described_class.resized_thumbnail_attachment(upload_for(blob))
+        image = read_image(resized)
+
+        expect(image.dimensions).to eq([180, 180])
+        expect_green(colour_at(image, 0, 90))
+        expect_green(colour_at(image, 90, 90))
+        expect_green(colour_at(image, 179, 90))
+      end
+
+      it 'centre-crops a tall image to 180x180 without distorting it' do
+        blob = image_blob(
+            width: 180,
+            height: 360,
+            background: 'red',
+            draw: -> convert {
+              convert.fill 'green'
+              convert.draw 'rectangle 0,90 179,269'
+            })
+
+        resized = described_class.resized_thumbnail_attachment(upload_for(blob))
+        image = read_image(resized)
+
+        expect(image.dimensions).to eq([180, 180])
+        expect_green(colour_at(image, 90, 0))
+        expect_green(colour_at(image, 90, 90))
+        expect_green(colour_at(image, 90, 179))
+      end
+
+      it 'keeps a square image square without distortion' do
+        blob = image_blob(
+            width: 180,
+            height: 180,
+            background: 'red',
+            draw: -> convert {
+              convert.fill 'blue'
+              convert.draw 'rectangle 90,0 179,179'
+            })
+
+        resized = described_class.resized_thumbnail_attachment(upload_for(blob))
+        image = read_image(resized)
+
+        expect(image.dimensions).to eq([180, 180])
+        expect_red(colour_at(image, 20, 90))
+        expect_blue(colour_at(image, 160, 90))
+      end
+    end
+
+    describe '#attach_thumbnail_from_url!' do
+      it 'attaches a fetched remote image through the common resize path' do
+        blob = image_blob(
+            width: 240,
+            height: 180,
+            background: 'red',
+            draw: -> convert {
+              convert.fill 'green'
+              convert.draw 'rectangle 30,0 209,179'
+            })
+        response = Preview::HttpFetcher::Response.new(
+            blob,
+            'image/png',
+            'https://example.com/thumb.png')
+        allow(Preview::ThumbnailFetcher).to receive(:fetch_image_response)
+            .with('https://example.com/thumb.png')
+            .and_return(response)
+
+        post = described_class.create!(title: 'title', url: 'https://example.com/post')
+
+        expect(post.thumbnail).to receive(:attach).once.and_call_original
+        post.attach_thumbnail_from_url!('https://example.com/thumb.png')
+
+        expect(post.thumbnail).to be_attached
+        image = read_image(post.thumbnail)
+        expect(image.dimensions).to eq([180, 180])
+      end
+
+      it 'does not attach anything when thumbnail conversion fails' do
+        response = Preview::HttpFetcher::Response.new(
+            'not-an-image',
+            'image/png',
+            'https://example.com/thumb.png')
+        allow(Preview::ThumbnailFetcher).to receive(:fetch_image_response)
+            .with('https://example.com/thumb.png')
+            .and_return(response)
+        allow(described_class).to receive(:resized_thumbnail_attachment)
+            .and_raise(MiniMagick::Error, 'convert failed')
+
+        post = described_class.create!(title: 'title', url: 'https://example.com/post')
+
+        expect {
+          post.attach_thumbnail_from_url!('https://example.com/thumb.png')
+        }.to raise_error(Post::RemoteThumbnailFetchFailed, 'convert failed')
+
+        expect(post.thumbnail).not_to be_attached
+      end
+
+      it 'keeps an existing thumbnail when remote conversion fails' do
+        existing = described_class.create!(title: 'title', url: 'https://example.com/post')
+        existing.thumbnail.attach(
+            io: StringIO.new('existing'),
+            filename: 'existing.jpg',
+            content_type: 'image/jpeg')
+        blob_id = existing.thumbnail.blob.id
+        response = Preview::HttpFetcher::Response.new(
+            'not-an-image',
+            'image/png',
+            'https://example.com/thumb.png')
+        allow(Preview::ThumbnailFetcher).to receive(:fetch_image_response)
+            .with('https://example.com/thumb.png')
+            .and_return(response)
+        allow(described_class).to receive(:resized_thumbnail_attachment)
+            .and_raise(MiniMagick::Error, 'convert failed')
+
+        expect {
+          existing.attach_thumbnail_from_url!('https://example.com/thumb.png')
+        }.to raise_error(Post::RemoteThumbnailFetchFailed, 'convert failed')
+
+        existing.reload
+        expect(existing.thumbnail).to be_attached
+        expect(existing.thumbnail.blob.id).to eq(blob_id)
+      end
+    end
+  end
+
+  describe 'original created datetime validation' do
+    it 'allows unrelated updates on persisted posts with second-bearing datetimes' do
+      post = described_class.create!(title: 'title', url: 'https://example.com/post')
+      post.update_columns(
+        original_created_from: Time.zone.parse('2024-01-01T12:34:30Z'),
+        original_created_before: Time.zone.parse('2024-01-01T12:35:30Z')
+      )
+
+      post.title = 'updated title'
+
+      expect(post).to be_valid
+      expect { post.save! }.not_to raise_error
+    end
+
+    it 'rejects second-bearing updates when the datetime field changes' do
+      post = described_class.create!(title: 'title', url: 'https://example.com/post')
+
+      post.original_created_from = '2024-01-01T12:34:30Z'
+
+      expect(post).to be_invalid
+      expect(post.errors[:original_created_from]).to eq(
+        [described_class::ORIGINAL_CREATED_MINUTE_PRECISION_MESSAGE]
+      )
+    end
+
+    it 'accepts fixing persisted datetimes to minute precision' do
+      post = described_class.create!(title: 'title', url: 'https://example.com/post')
+      post.update_columns(
+        original_created_from: Time.zone.parse('2024-01-01T12:34:30Z'),
+        original_created_before: Time.zone.parse('2024-01-01T12:35:30Z')
+      )
+
+      post.original_created_from = '2024-01-01T12:34Z'
+      post.original_created_before = '2024-01-01T12:35Z'
+
+      expect(post).to be_valid
+      expect { post.save! }.not_to raise_error
+    end
+
+    it 'adds only the minute-precision error for second precision values' do
+      post = described_class.new(
+        title: 'title',
+        url: 'https://example.com/post',
+        original_created_from: '2024-01-01T12:34:30',
+        original_created_before: '2024-01-01T12:35'
+      )
+
+      expect(post).to be_invalid
+      expect(post.errors[:original_created_from]).to eq(
+        [described_class::ORIGINAL_CREATED_MINUTE_PRECISION_MESSAGE]
+      )
+      expect(post.errors[:original_created_at]).to be_empty
+    end
+
+    it 'adds only the minute-precision error for fractional-second values' do
+      post = described_class.new(
+        title: 'title',
+        url: 'https://example.com/post',
+        original_created_from: '2024-01-01T12:34:00.123',
+        original_created_before: '2024-01-01T12:35'
+      )
+
+      expect(post).to be_invalid
+      expect(post.errors[:original_created_from]).to eq(
+        [described_class::ORIGINAL_CREATED_MINUTE_PRECISION_MESSAGE]
+      )
+      expect(post.errors[:original_created_at]).to be_empty
+    end
+
+    it 'checks range rules only for valid minute-precision endpoints' do
+      post = described_class.new(
+        title: 'title',
+        url: 'https://example.com/post',
+        original_created_from: '2024-01-01T12:34',
+        original_created_before: '2024-01-01T12:34'
+      )
+
+      expect(post).to be_invalid
+      expect(post.errors[:original_created_at]).to eq(
+        [described_class::ORIGINAL_CREATED_ORDER_MESSAGE]
+      )
+    end
+
+    it 'accepts a one-minute range at minute precision' do
+      post = described_class.new(
+        title: 'title',
+        url: 'https://example.com/post',
+        original_created_from: '2024-01-01T12:34',
+        original_created_before: '2024-01-01T12:35'
+      )
+
+      expect(post).to be_valid
+    end
+
+    it 'rejects invalid calendar dates and invalid hours' do
+      invalid_dates = [
+        '2024-02-31T12:00',
+        '2023-02-29T12:00',
+        '2024-02-29T24:00'
+      ]
+
+      invalid_dates.each do |value|
+        post = described_class.new(
+          title: 'title',
+          url: 'https://example.com/post',
+          original_created_from: value
+        )
+
+        expect(post).to be_invalid
+        expect(post.errors[:original_created_from]).to eq(
+          [described_class::ORIGINAL_CREATED_INVALID_MESSAGE]
+        )
+      end
+    end
+  end
 end

backend/spec/requests/post_imports_spec.rb

@@ -84,9 +84,81 @@ RSpec.describe 'Post imports API', type: :request do
       expect(response).to have_http_status(:bad_request)
       expect(json.fetch('message')).to eq('取込行の形式が不正です．')
     end
+
+    it 'returns original created datetime validation errors for minute precision' do
+      sign_in_as(member)
+
+      post '/posts/import/validate', params: {
+        rows: [{
+          sourceRow: 1,
+          url: 'https://example.com/post',
+          metadataUrl: 'https://example.com/post',
+          attributes: {
+            originalCreatedFrom: '2020-01-01T00:00:30Z',
+            originalCreatedBefore: '2020-01-01T00:01Z' },
+          provenance: {
+            url: 'manual',
+            originalCreatedFrom: 'manual',
+            originalCreatedBefore: 'manual' },
+          tagSources: { automatic: '', manual: '' }
+        }],
+        changed_row: -1
+      }
+
+      expect(response).to have_http_status(:ok)
+      expect(json.fetch('rows').first.fetch('validation_errors')).to include(
+        'original_created_from' => ['オリジナルの作成日時は分単位で入力してください．']
+      )
+      expect(json.fetch('rows').first.fetch('validation_errors'))
+          .not_to have_key('original_created_at')
+    end
   end
 
   describe 'POST /posts/import' do
+    it 'keeps the duration string contract through preview, validate, and import' do
+      sign_in_as(member)
+      allow(PostMetadataFetcher).to receive(:fetch).and_return(
+        title: 'fetched title',
+        thumbnail_base: nil,
+        duration: '2.5',
+        tags: '動画'
+      )
+
+      post '/posts/import/preview', params: {
+        source: 'https://example.com/video'
+      }
+      preview_row = json.fetch('rows').first
+      expect(preview_row.dig('attributes', 'duration')).to eq('2.5')
+
+      post '/posts/import/validate', params: {
+        rows: [{
+          sourceRow: preview_row.fetch('source_row'),
+          url: preview_row.fetch('url'),
+          attributes: preview_row.fetch('attributes'),
+          provenance: preview_row.fetch('provenance'),
+          tagSources: preview_row.fetch('tag_sources'),
+          metadataUrl: preview_row.fetch('metadata_url')
+        }],
+        changed_row: -1
+      }
+      validated_row = json.fetch('rows').first
+      expect(validated_row.dig('attributes', 'duration')).to eq('2.5')
+
+      post '/posts/import', params: {
+        rows: [{
+          sourceRow: validated_row.fetch('source_row'),
+          url: validated_row.fetch('url'),
+          attributes: validated_row.fetch('attributes'),
+          provenance: validated_row.fetch('provenance'),
+          tagSources: validated_row.fetch('tag_sources'),
+          metadataUrl: validated_row.fetch('metadata_url')
+        }]
+      }
+
+      expect(response).to have_http_status(:ok)
+      expect(Post.order(:id).last.video_ms).to eq(2_500)
+    end
+
     it 'returns a formal skipped result for an existing post' do
       existing = create(:post, url: 'https://example.com/existing')
       sign_in_as(member)

backend/spec/requests/posts_spec.rb

@@ -2206,6 +2206,91 @@ RSpec.describe 'Posts API', type: :request do
 
       expect(response).to have_http_status(:unprocessable_entity)
     end
+
+    it 'rejects second-bearing original created timestamps on POST /posts' do
+      sign_in_as(member)
+
+      post '/posts', params: post_write_params(
+          title: 'invalid original created from',
+          url: 'https://example.com/invalid-original-created-from',
+          tags: 'spec_tag',
+          thumbnail: dummy_upload,
+          original_created_from: '2020-01-01T00:00:01Z')
+
+      expect(response).to have_http_status(:unprocessable_entity)
+      expect(json.fetch('errors')).to include(
+        'original_created_from' => ['オリジナルの作成日時は分単位で入力してください．']
+      )
+      expect(json.fetch('errors')).not_to have_key('original_created_at')
+    end
+
+    it 'rejects fractional-second original created timestamps on POST /posts' do
+      sign_in_as(member)
+
+      post '/posts', params: post_write_params(
+          title: 'invalid original created before',
+          url: 'https://example.com/invalid-original-created-before',
+          tags: 'spec_tag',
+          thumbnail: dummy_upload,
+          original_created_before: '2020-01-01T00:00:00.123Z')
+
+      expect(response).to have_http_status(:unprocessable_entity)
+      expect(json.fetch('errors')).to include(
+        'original_created_before' => ['オリジナルの作成日時は分単位で入力してください．']
+      )
+      expect(json.fetch('errors')).not_to have_key('original_created_at')
+    end
+
+    it 'rejects non-increasing original created ranges on POST /posts' do
+      sign_in_as(member)
+
+      post '/posts', params: post_write_params(
+          title: 'non-increasing original created range',
+          url: 'https://example.com/non-increasing-original-created-range',
+          tags: 'spec_tag',
+          thumbnail: dummy_upload,
+          original_created_from: '2020-01-01T00:00Z',
+          original_created_before: '2020-01-01T00:00Z')
+
+      expect(response).to have_http_status(:unprocessable_entity)
+      expect(json.fetch('errors')).to include(
+        'original_created_at' => ['オリジナルの作成日時の順番がをかしぃです．']
+      )
+    end
+
+    it 'accepts original created ranges that are exactly one minute on POST /posts' do
+      sign_in_as(member)
+
+      post '/posts', params: post_write_params(
+          title: 'valid original created range',
+          url: 'https://example.com/valid-original-created-range',
+          tags: 'spec_tag',
+          thumbnail: dummy_upload,
+          original_created_from: '2020-01-01T00:00Z',
+          original_created_before: '2020-01-01T00:01Z')
+
+      expect(response).to have_http_status(:created)
+      expect(Time.iso8601(json.fetch('original_created_from')))
+          .to eq(Time.iso8601('2020-01-01T00:00Z'))
+      expect(Time.iso8601(json.fetch('original_created_before')))
+          .to eq(Time.iso8601('2020-01-01T00:01Z'))
+    end
+
+    it 'rejects unparseable original created timestamps on PUT /posts/:id' do
+      sign_in_as(member)
+      base_version = create_post_version_for!(post_record)
+
+      put "/posts/#{post_record.id}", params: post_write_params(
+          base_version_no: base_version.version_no,
+          title: 'updated title',
+          tags: 'spec_tag',
+          original_created_from: 'not-a-time')
+
+      expect(response).to have_http_status(:unprocessable_entity)
+      expect(json.fetch('errors')).to include(
+        'original_created_from' => ['オリジナルの作成日時の形式が不正です．']
+      )
+    end
   end
 
   describe 'tag versioning from post write actions' do

backend/spec/services/post_creator_spec.rb

@@ -0,0 +1,82 @@
+require 'rails_helper'
+require 'base64'
+
+RSpec.describe PostCreator do
+  let(:actor) { create(:user, :member) }
+
+  def real_thumbnail_upload
+    gif = Base64.decode64('R0lGODdhAQABAIABAP///wAAACwAAAAAAQABAAACAkQBADs=')
+
+    Rack::Test::UploadedFile.new(
+        StringIO.new(gif),
+        'image/gif',
+        original_filename: 'thumbnail.gif')
+  end
+
+  before do
+    allow(Tag).to receive(:normalise_tags!).and_return({ tags: [], sections: {} })
+    allow(TagVersioning).to receive(:record_tag_snapshots!)
+    allow(Tag).to receive(:expand_parent_tags).and_return([])
+    allow(PostVersionRecorder).to receive(:record!)
+  end
+
+  it 'prefers an explicit upload over thumbnail_base' do
+    allow(Post).to receive(:resized_thumbnail_attachment).and_return(
+        io: StringIO.new('upload'),
+        filename: 'resized_thumbnail.jpg',
+        content_type: 'image/jpeg')
+    expect_any_instance_of(Post).not_to receive(:attach_thumbnail_from_url!)
+
+    post = described_class.new(
+        actor:,
+        attributes: {
+          title: 'title',
+          url: 'https://example.com/post',
+          thumbnail: real_thumbnail_upload,
+          thumbnail_base: 'https://example.com/thumb.jpg',
+          tags: '' }).create!
+
+    expect(post.thumbnail).to be_attached
+    expect(post.thumbnail_base).to eq('https://example.com/thumb.jpg')
+  end
+
+  it 'uses the common remote thumbnail attach path when thumbnail_base is given' do
+    expect_any_instance_of(Post).to receive(:attach_thumbnail_from_url!)
+        .with('https://example.com/thumb.jpg') do |post, _url|
+      post.thumbnail.attach(
+          io: StringIO.new('thumbnail'),
+          filename: 'thumbnail.jpg',
+          content_type: 'image/jpeg')
+    end
+
+    post = described_class.new(
+        actor:,
+        attributes: {
+          title: 'title',
+          url: 'https://example.com/post',
+          thumbnail_base: 'https://example.com/thumb.jpg',
+          tags: '' }).create!
+
+    expect(post.thumbnail_base).to eq('https://example.com/thumb.jpg')
+    expect(post.thumbnail).to be_attached
+  end
+
+  it 'keeps creating the post and records a warning when remote thumbnail fetch fails' do
+    allow_any_instance_of(Post).to receive(:attach_thumbnail_from_url!)
+        .and_raise(Post::RemoteThumbnailFetchFailed, 'サムネール画像を取得できませんでした．')
+    creator = described_class.new(
+        actor:,
+        attributes: {
+          title: 'title',
+          url: 'https://example.com/post',
+          thumbnail_base: 'https://example.com/thumb.jpg',
+          tags: '' })
+
+    post = creator.create!
+
+    expect(post.thumbnail_base).to eq('https://example.com/thumb.jpg')
+    expect(post.thumbnail).not_to be_attached
+    expect(creator.field_warnings).to eq(
+        thumbnail_base: ['サムネール画像を取得できませんでした．'])
+  end
+end

backend/spec/services/post_import_previewer_spec.rb

@@ -68,7 +68,7 @@ RSpec.describe PostImportPreviewer do
       allow(PostMetadataFetcher).to receive(:fetch).and_return(
         title: 'metadata title',
         thumbnail_base: 'https://example.com/thumb.jpg',
-        duration: 2_000,
+        duration: '2',
         tags: 'known-tag'
       )
 
@@ -79,7 +79,7 @@ RSpec.describe PostImportPreviewer do
       expect(result.fetch(:attributes)).to include(
         'title' => 'metadata title',
         'thumbnail_base' => 'https://example.com/thumb.jpg',
-        'duration' => 2_000,
+        'duration' => '2',
         'tags' => 'known-tag'
       )
       expect(result.fetch(:field_warnings)).not_to have_key('tags')

backend/spec/services/post_import_row_normaliser_spec.rb

@@ -6,7 +6,7 @@ RSpec.describe PostImportRowNormaliser do
       sourceRow: '1',
       url: 'https://example.com/post',
       metadataUrl: 'https://example.com/post',
-      attributes: { title: 'title', duration: 1_000 },
+      attributes: { title: 'title', duration: '1' },
       provenance: { url: 'manual', title: 'automatic' },
       tagSources: { automatic: 'tag', manual: '' }
     }.deep_merge(overrides)
@@ -21,7 +21,7 @@ RSpec.describe PostImportRowNormaliser do
           'source_row' => 1,
           'url' => 'https://example.com/post',
           'metadata_url' => 'https://example.com/post',
-          'attributes' => { 'title' => 'title', 'duration' => 1_000 },
+          'attributes' => { 'title' => 'title', 'duration' => '1' },
           'provenance' => { 'url' => 'manual', 'title' => 'automatic' },
           'tag_sources' => { 'automatic' => 'tag', 'manual' => '' }
         }

backend/spec/services/post_import_runner_spec.rb

@@ -130,4 +130,23 @@ RSpec.describe PostImportRunner do
 
     expect(result).to include(status: 'skipped', existing_post_id: existing.id)
   end
+
+  it 'returns thumbnail warnings from PostCreator on a created row' do
+    previewer = instance_double(PostImportPreviewer)
+    allow(PostImportPreviewer).to receive(:new).and_return(previewer)
+    allow(previewer).to receive(:preview_rows).and_return([preview])
+    created_post = create(:post)
+    creator = instance_double(
+        PostCreator,
+        create!: created_post,
+        field_warnings: { thumbnail_base: ['サムネール画像を取得できませんでした．'] })
+    allow(PostCreator).to receive(:new).and_return(creator)
+
+    result = described_class.new(actor:, rows: [row]).run.fetch(:rows).first
+
+    expect(result).to include(
+      status: 'created',
+      field_warnings: { thumbnail_base: ['サムネール画像を取得できませんでした．'] }
+    )
+  end
 end

backend/spec/services/post_metadata_fetcher_spec.rb

@@ -37,16 +37,30 @@ RSpec.describe PostMetadataFetcher do
     )
   end
 
-  it 'preserves an input offset and fractional-second precision' do
+  it 'rounds second and fractional-second timestamps down to one-minute ranges' do
     result = fetch_with_published_time('2024-02-03T12:34:56.123+02:30')
 
     expect(Time.iso8601(result.fetch(:original_created_from)))
-        .to eq(Time.iso8601('2024-02-03T12:34:56.123+02:30'))
+        .to eq(Time.iso8601('2024-02-03T12:34:00+02:30'))
     expect(
       Time.iso8601(result.fetch(:original_created_before)) -
       Time.iso8601(result.fetch(:original_created_from))
-    ).to eq(0.001)
-    expect(result.fetch(:original_created_from)).to include('.123000000')
+    ).to eq(60)
+    expect(result.fetch(:original_created_from)).not_to include('.')
+  end
+
+  it 'treats hour-precision timestamps as one-hour ranges with and without offsets' do
+    offset_result = fetch_with_published_time('2024-02-03T12+02:30')
+    local_result = fetch_with_published_time('2024-02-03T12')
+
+    expect(Time.iso8601(offset_result.fetch(:original_created_from)))
+        .to eq(Time.iso8601('2024-02-03T12:00:00+02:30'))
+    expect(
+      Time.iso8601(offset_result.fetch(:original_created_before)) -
+      Time.iso8601(offset_result.fetch(:original_created_from))
+    ).to eq(3600)
+    expect(local_result.fetch(:original_created_from)).to eq('2024-02-03T12:00:00Z')
+    expect(local_result.fetch(:original_created_before)).to eq('2024-02-03T13:00:00Z')
   end
 
   it 'adds platform tags for known video URLs' do
@@ -61,4 +75,49 @@ RSpec.describe PostMetadataFetcher do
     expect(result.fetch(:original_created_from)).to be_nil
     expect(result.fetch(:original_created_before)).to be_nil
   end
+
+  it 'returns nil dates for an invalid timestamp second value' do
+    result = fetch_with_published_time('2024-02-03T12:34:99Z')
+
+    expect(result.fetch(:original_created_from)).to be_nil
+    expect(result.fetch(:original_created_before)).to be_nil
+  end
+
+  it 'returns nil dates for invalid calendar dates and invalid hour values' do
+    invalid_day = fetch_with_published_time('2024-02-31T12:00Z')
+    invalid_leap = fetch_with_published_time('2023-02-29T12:00Z')
+    invalid_hour = fetch_with_published_time('2024-02-29T24:00Z')
+
+    [invalid_day, invalid_leap, invalid_hour].each do |result|
+      expect(result.fetch(:original_created_from)).to be_nil
+      expect(result.fetch(:original_created_before)).to be_nil
+    end
+  end
+
+  it 'accepts a valid leap-day timestamp at minute precision' do
+    result = fetch_with_published_time('2024-02-29T12:34Z')
+
+    expect(result.fetch(:original_created_from)).to eq('2024-02-29T12:34:00Z')
+    expect(result.fetch(:original_created_before)).to eq('2024-02-29T12:35:00Z')
+  end
+
+  it 'serialises metadata duration as the same seconds string contract used by forms' do
+    html = <<~HTML
+      <html><head>
+        <meta property="article:published_time" content="2024-02-03T12:34:56.123+02:30">
+        <meta property="og:video:duration" content="2.5">
+      </head></html>
+    HTML
+    uri = URI.parse('https://example.com/video')
+    allow(Preview::UrlSafety).to receive(:validate)
+        .with('https://example.com/video')
+        .and_return([uri, ['8.8.8.8']])
+    allow(Preview::HttpFetcher).to receive(:fetch).and_return(Response.new(html))
+    allow(Preview::HtmlMetadataExtractor).to receive(:extract)
+        .and_return(title: 'title', image_url: nil)
+
+    result = described_class.fetch('https://example.com/video')
+
+    expect(result.fetch(:duration)).to eq('2.5')
+  end
 end

backend/spec/services/preview/thumbnail_fetcher_spec.rb

@@ -48,4 +48,56 @@ RSpec.describe Preview::ThumbnailFetcher do
       expect(described_class.fetch('https://example.com/page')).to eq('jpeg-bytes')
     end
   end
+
+  describe '.fetch_image_response' do
+    it 'rejects an unsafe input URL before HTTP fetch' do
+      allow(Preview::UrlSafety).to receive(:validate)
+          .and_raise(Preview::UrlSafety::UnsafeUrl, '安全でない接続先は使用できません．')
+      expect(Preview::HttpFetcher).not_to receive(:fetch)
+
+      expect {
+        described_class.fetch_image_response('https://unsafe.example.com/thumb.jpg')
+      }.to raise_error(Preview::UrlSafety::UnsafeUrl, '安全でない接続先は使用できません．')
+    end
+
+    it 'rejects an unsafe redirect target' do
+      allow(Preview::UrlSafety).to receive(:validate)
+          .and_return([URI.parse('https://example.com/thumb.jpg'), ['8.8.8.8']])
+      allow(Preview::HttpFetcher).to receive(:fetch)
+          .with('https://example.com/thumb.jpg')
+          .and_raise(Preview::UrlSafety::UnsafeUrl, '安全でない接続先は使用できません．')
+
+      expect {
+        described_class.fetch_image_response('https://example.com/thumb.jpg')
+      }.to raise_error(Preview::UrlSafety::UnsafeUrl, '安全でない接続先は使用できません．')
+    end
+
+    it 'rejects an oversized image response' do
+      allow(Preview::UrlSafety).to receive(:validate)
+          .and_return([URI.parse('https://example.com/thumb.jpg'), ['8.8.8.8']])
+      allow(Preview::HttpFetcher).to receive(:fetch)
+          .with('https://example.com/thumb.jpg')
+          .and_raise(Preview::HttpFetcher::ResponseTooLarge, 'too large')
+
+      expect {
+        described_class.fetch_image_response('https://example.com/thumb.jpg')
+      }.to raise_error(Preview::HttpFetcher::ResponseTooLarge)
+    end
+
+    it 'rejects a non-image content type' do
+      allow(Preview::UrlSafety).to receive(:validate)
+          .and_return([URI.parse('https://example.com/thumb.jpg'), ['8.8.8.8']])
+      allow(Preview::HttpFetcher).to receive(:fetch)
+          .with('https://example.com/thumb.jpg')
+          .and_return(
+              Preview::HttpFetcher::Response.new(
+                  '<html></html>',
+                  'text/html',
+                  'https://example.com/thumb.jpg'))
+
+      expect {
+        described_class.fetch_image_response('https://example.com/thumb.jpg')
+      }.to raise_error(Preview::ThumbnailFetcher::GenerationFailed)
+    end
+  end
 end

backend/spec/services/youtube/sync_spec.rb

@@ -10,6 +10,37 @@ RSpec.describe Youtube::Sync do
     allow(sync).to receive(:attach_thumbnail_if_needed!)
   end
 
+  describe '#attach_thumbnail_if_needed!' do
+    it 'uses the common remote thumbnail attach path' do
+      post = create(:post, thumbnail_base: nil)
+      allow(sync).to receive(:attach_thumbnail_if_needed!).and_call_original
+
+      expect(post).to receive(:attach_thumbnail_from_url!)
+          .with('https://example.com/thumb.jpg')
+
+      sync.send(
+          :attach_thumbnail_if_needed!,
+          post,
+          'https://example.com/thumb.jpg')
+    end
+
+    it 'retries on a later sync when the previous remote attach failed' do
+      post = create(:post, thumbnail_base: nil)
+      allow(sync).to receive(:attach_thumbnail_if_needed!).and_call_original
+      expect(post).to receive(:attach_thumbnail_from_url!)
+          .with('https://example.com/thumb.jpg')
+          .twice
+          .and_raise(Post::RemoteThumbnailFetchFailed, 'failed')
+
+      2.times do
+        sync.send(
+            :attach_thumbnail_if_needed!,
+            post,
+            'https://example.com/thumb.jpg')
+      end
+    end
+  end
+
   describe '#sync!' do
     it 'returns without fetching video details when no video ids are discovered' do
       allow(sync).to receive(:query_terms).and_return([])
@@ -76,7 +107,7 @@ RSpec.describe Youtube::Sync do
       sync.sync!
     end
 
-    it 'creates a YouTube post with default tags and no_deerjikist when no deerjikist mapping exists' do
+    it 'creates a YouTube post with default tags when no deerjikist mapping exists' do
       Tag.tagme
       Tag.bot
       Tag.youtube

backend/spec/tasks/nico_sync_spec.rb

@@ -18,7 +18,11 @@ RSpec.describe "nico:sync" do
 
   it "既存 post を見つけて、nico tag と linked tag を追加し、差分が出たら bot を付ける" do
     # 既存 post（正規表現で拾われるURL）
-    post = Post.create!(title: "old", url: "https://www.nicovideo.jp/watch/sm9", uploaded_user: nil)
+    post = Post.create!(
+      title: "old",
+      url: "https://www.nicovideo.jp/watch/sm9",
+      uploaded_user: nil
+    )
 
     # 既存の非nicoタグ（kept_non_nico_ids）
     kept_general = create_tag!("spec_kept", category: "general")
@@ -60,8 +64,54 @@ RSpec.describe "nico:sync" do
     expect(active_tag_names).to include("bot操作")
   end
 
+  it '既存 post のサムネール取得に共通 attach 経路を使ふ' do
+    post = Post.create!(
+        title: 'old',
+        url: 'https://www.nicovideo.jp/watch/sm9',
+        uploaded_user: nil)
+    Tag.bot
+    Tag.tagme
+
+    stub_python([{ 'code' => 'sm9', 'title' => 't', 'tags' => [] }])
+    allow(URI).to receive(:open)
+        .and_return(
+            StringIO.new(
+                '<meta name="thumbnail" content="https://example.com/thumb.jpg">'))
+    expect(post).to receive(:attach_thumbnail_from_url!)
+        .with('https://example.com/thumb.jpg')
+
+    run_rake_task('nico:sync')
+  end
+
+  it 'サムネール取得失敗後も次回同期で再試行できる' do
+    post = Post.create!(
+        title: 'old',
+        url: 'https://www.nicovideo.jp/watch/sm9',
+        uploaded_user: nil)
+    Tag.bot
+    Tag.tagme
+
+    stub_python([{ 'code' => 'sm9', 'title' => 't', 'tags' => [] }])
+    allow(URI).to receive(:open)
+        .and_return(
+            StringIO.new(
+                '<meta name="thumbnail" content="https://example.com/thumb.jpg">'))
+    expect(post).to receive(:attach_thumbnail_from_url!)
+        .with('https://example.com/thumb.jpg')
+        .twice
+        .and_raise(Post::RemoteThumbnailFetchFailed, 'failed')
+
+    2.times do
+      run_rake_task('nico:sync')
+    end
+  end
+
   it "既存 post にあった古い nico tag は active から外され、履歴として discard される" do
-    post = Post.create!(title: "old", url: "https://www.nicovideo.jp/watch/sm9", uploaded_user: nil)
+    post = Post.create!(
+      title: "old",
+      url: "https://www.nicovideo.jp/watch/sm9",
+      uploaded_user: nil
+    )
 
     # 旧nicoタグ（今回の同期結果に含まれない）
     old_nico = create_tag!("nico:OLD", category: "nico")

frontend/AGENTS.md

@@ -153,6 +153,13 @@ pass or the remaining failure is clearly blocked.
   closing `</div>)` forms when nearby code uses them.
 - Block bodies for components, functions, callbacks, `if`, `try`, `catch`,
   `finally`, loops, and JSX nesting use 2 spaces per level.
+- Put the opening brace of `try`, `catch`, and `finally` blocks on the next
+  line at the same indentation as the keyword.
+- Do not indent the opening `{` one level deeper than `try`, `catch`, or
+  `finally`.
+- Indent the block body 2 spaces deeper than the keyword and opening brace.
+- Put the closing `}` on its own line at the same indentation as the keyword.
+- Do not write `try {`, `catch {`, or `finally {`.
 - Wrapped expressions, arguments, ternary branches, method chains, and object
   pairs use 4-space continuation indentation relative to the owning
   expression. Do not confuse this with 2-space block indentation.
@@ -166,6 +173,10 @@ pass or the remaining failure is clearly blocked.
   `?` / `:` pairing.
 - Keep short inline props types local when they remain readable and within the
   line limit; do not mechanically extract a named type with no reuse benefit.
+- In JavaScript, JSX, TypeScript, and TSX, never use `_1`, `_2`, or similar
+  Ruby-style numbered parameter names. Reserve numbered parameters for Ruby.
+  Use a meaningful callback parameter name such as `row`, `item`, `value`,
+  `entry`, or `result`.
 - In multi-line object literals, keep the opening `{` with the first pair when
   the line length allows it; do not mechanically explode short objects into
   Prettier-style vertical blocks.
@@ -229,12 +240,29 @@ const Component = () => {
 }
 ```
 
+- `try` / `catch` / `finally` brace placement example:
+
+```ts
+try
+{
+  doWork ()
+}
+catch
+{
+  recover ()
+}
+finally
+{
+  cleanUp ()
+}
+```
+
 - Continuation indentation example:
 
 ```ts
 const editingRow =
     Number.isFinite (editingSourceRow)
-    ? rows.find (_1 => _1.sourceRow === editingSourceRow) ?? null
+    ? rows.find (row => row.sourceRow === editingSourceRow) ?? null
     : null
 ```
 

frontend/src/components/PostEditForm.test.tsx

@@ -19,8 +19,8 @@ const toastApi = vi.hoisted (() => ({
 vi.mock ('@/lib/posts', () => postsApi)
 vi.mock ('@/lib/api', () => api)
 vi.mock ('@/components/ui/use-toast', () => toastApi)
-vi.mock ('@/components/dialogues/DialogueProvider', () => ({
-  useDialogue: () => ({
+vi.mock ('@/lib/dialogues/useDialogue', () => ({
+  default: () => ({
     choice: vi.fn (),
   }),
 }))
@@ -78,15 +78,39 @@ describe ('PostEditForm', () => {
 
     render (<PostEditForm post={post} onSave={vi.fn ()}/>)
 
-    expect (screen.getByRole ('spinbutton')).toHaveValue (180.5)
+    expect (screen.getByPlaceholderText ('例: 2 / 2.5 / 1:23')).toHaveValue ('180.5')
 
     const tags = screen.getAllByRole ('textbox')[2]
     fireEvent.change (tags, { target: { value: 'general-tag' } })
-    expect (screen.queryByRole ('spinbutton')).not.toBeInTheDocument ()
+    expect (screen.queryByPlaceholderText ('例: 2 / 2.5 / 1:23')).not.toBeInTheDocument ()
 
     fireEvent.change (tags, {
       target: { value: '動画 general-tag' },
     })
-    expect (screen.getByRole ('spinbutton')).toHaveValue (180.5)
+    expect (screen.getByPlaceholderText ('例: 2 / 2.5 / 1:23')).toHaveValue ('180.5')
+  })
+
+  it ('shows deduplicated original-created endpoint errors on the shared datetime field', async () => {
+    const post = buildPost ()
+    api.isApiError.mockReturnValue (true)
+    postsApi.updatePost.mockRejectedValueOnce ({
+      response: {
+        status: 422,
+        data:   {
+          type: 'validation_error',
+          errors: {
+            original_created_at: ['日時を確認してください．'],
+            original_created_from: ['日時を確認してください．'],
+            original_created_before: ['終了を確認してください．'] },
+        },
+      },
+    })
+
+    render (<PostEditForm post={post} onSave={vi.fn ()}/>)
+    fireEvent.submit (screen.getByRole ('button', { name: '更新' }).closest ('form')!)
+
+    expect (await screen.findByText ('日時を確認してください．')).toBeInTheDocument ()
+    expect (screen.getByText ('終了を確認してください．')).toBeInTheDocument ()
+    expect (screen.getAllByText ('日時を確認してください．')).toHaveLength (1)
   })
 })

frontend/src/components/PostEditForm.tsx

@@ -1,15 +1,16 @@
 import { useEffect, useMemo, useState } from 'react'
 
-import PostFormTagsArea from '@/components/PostFormTagsArea'
 import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
 import FieldError from '@/components/common/FieldError'
-import FormField from '@/components/common/FormField'
-import { useDialogue } from '@/components/dialogues/DialogueProvider'
+import PostDurationField from '@/components/posts/PostDurationField'
+import PostTagsField from '@/components/posts/PostTagsField'
+import PostTextField from '@/components/posts/PostTextField'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { isApiError } from '@/lib/api'
+import useDialogue from '@/lib/dialogues/useDialogue'
 import { updatePost } from '@/lib/posts'
-import { inputClass, msToTime } from '@/lib/utils'
+import { msToTime } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 
 import type { FC, FormEvent } from 'react'
@@ -17,7 +18,11 @@ import type { FC, FormEvent } from 'react'
 import type { Post, TagWithSections } from '@/types'
 
 type PostFormField =
-    'parentPostIds' | 'tags' | 'videoMs' | 'originalCreatedAt'
+    'parentPostIds' | 'tags' | 'videoMs'
+    | 'originalCreatedAt' | 'originalCreatedFrom' | 'originalCreatedBefore'
+
+const groupedMessages = (...values: (string[] | undefined)[]): string[] =>
+    [...new Set (values.flatMap (value => value ?? []))]
 
 const videoMsToDurationValue = (videoMs: number | null): string =>
     videoMs == null ? '' : String (videoMs / 1_000)
@@ -157,32 +162,20 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
       <form onSubmit={handleSubmit} className="max-w-xl pt-2 space-y-4">
 	<FieldError messages={baseErrors}/>
 
-	{/* タイトル */}
-	<FormField label="タイトル">
-	  {({ invalid }) => (
-	      <input
-		  type="text"
-		  disabled={disabled}
-		  className={inputClass (invalid)}
-		  value={title ?? ''}
-		  onChange={e => setTitle (e.target.value)}/>)}
-	</FormField>
+	<PostTextField
+	    label="タイトル"
+	    value={title ?? ''}
+	    disabled={disabled}
+	    onChange={setTitle}/>
 
-	{/* 親投稿 */}
-	<FormField label="親投稿" messages={fieldErrors.parentPostIds}>
-	  {({ describedBy, invalid }) => (
-	      <input
-		  type="text"
-		  disabled={disabled}
-		  value={parentPostIds}
-		  onChange={e => setParentPostIds (e.target.value)}
-		  aria-describedby={describedBy}
-		  aria-invalid={invalid}
-		  className={inputClass (invalid)}/>)}
-	</FormField>
+	<PostTextField
+	    label="親投稿"
+	    value={parentPostIds}
+	    disabled={disabled}
+	    errors={fieldErrors.parentPostIds}
+	    onChange={setParentPostIds}/>
 
-	{/* タグ */}
-	<PostFormTagsArea
+	<PostTagsField
 	    disabled={disabled}
 	    tags={tags}
 	    setTags={setTags}
@@ -195,21 +188,17 @@ const PostEditForm: FC<Props> = ({ post, onSave }) => {
 	    setOriginalCreatedFrom={setOriginalCreatedFrom}
 	    originalCreatedBefore={originalCreatedBefore}
 	    setOriginalCreatedBefore={setOriginalCreatedBefore}
-	    errors={fieldErrors.originalCreatedAt}/>
+	    errors={groupedMessages (
+		fieldErrors.originalCreatedAt,
+		fieldErrors.originalCreatedFrom,
+		fieldErrors.originalCreatedBefore)}/>
 
-	{/* 動画時間 */}
 	{videoFlg && (
-	    <FormField label="動画時間" messages={fieldErrors.videoMs}>
-	      {({ invalid }) => (
-		  <input
-		      type="number"
-		      min="0.001"
-		      step="0.001"
-		      disabled={disabled}
-		      className={inputClass (invalid)}
-		      value={duration}
-		      onChange={e => setDuration (e.target.value)}/>)}
-	    </FormField>)}
+	    <PostDurationField
+		value={duration}
+		disabled={disabled}
+		errors={fieldErrors.videoMs}
+		onChange={setDuration}/>)}
 
 	{/* 送信 */}
 	<Button type="submit" disabled={disabled}>

frontend/src/components/PostOriginalCreatedTimeField.test.tsx

@@ -20,8 +20,10 @@ describe ('PostOriginalCreatedTimeField', () => {
     fireEvent.change (inputs[0], { target: { value: '2026-01-02T03:04' } })
     fireEvent.change (inputs[1], { target: { value: '2026-01-03T03:04' } })
 
-    expect (setFrom).toHaveBeenCalledWith (expect.any (String))
-    expect (setBefore).toHaveBeenCalledWith (expect.any (String))
+    expect (setFrom).toHaveBeenCalledWith (expect.stringMatching (
+	/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}Z$/))
+    expect (setBefore).toHaveBeenCalledWith (expect.stringMatching (
+	/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}Z$/))
   })
 
   it ('infers an exclusive before value on blur', () => {
@@ -38,7 +40,43 @@ describe ('PostOriginalCreatedTimeField', () => {
     const input = screen.getAllByDisplayValue ('')[0]
     fireEvent.blur (input, { target: { value: '2026-01-02T03:04' } })
 
-    expect (setBefore).toHaveBeenCalledWith (expect.any (String))
+    const value = setBefore.mock.calls.at (-1)?.[0]
+    expect (value).toMatch (/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}Z$/)
+    expect (new Date (value).getTime () - new Date ('2026-01-02T03:04').getTime ())
+	.toBe (60_000)
+  })
+
+  it ('does not rewrite mounted values that only differ by offset notation', () => {
+    const setFrom = vi.fn ()
+    const setBefore = vi.fn ()
+
+    render (
+        <PostOriginalCreatedTimeField
+            originalCreatedFrom="2024-01-01T12:34+09:00"
+            setOriginalCreatedFrom={setFrom}
+            originalCreatedBefore="2024-01-01T12:35+09:00"
+            setOriginalCreatedBefore={setBefore}/>,
+    )
+
+    expect (setFrom).not.toHaveBeenCalled ()
+    expect (setBefore).not.toHaveBeenCalled ()
+  })
+
+  it ('emits minute-precision UTC values only when the user edits the input', () => {
+    const setFrom = vi.fn ()
+
+    render (
+        <PostOriginalCreatedTimeField
+            originalCreatedFrom="2024-01-01T12:34+09:00"
+            setOriginalCreatedFrom={setFrom}
+            originalCreatedBefore={null}
+            setOriginalCreatedBefore={vi.fn ()}/>,
+    )
+
+    const input = screen.getDisplayValue ('2024-01-01T12:34')
+    fireEvent.change (input, { target: { value: '2024-01-01T12:35' } })
+
+    expect (setFrom).toHaveBeenCalledWith ('2024-01-01T03:35Z')
   })
 
   it ('resets both values', () => {

frontend/src/components/PostOriginalCreatedTimeField.tsx

@@ -1,4 +1,4 @@
-import DateTimeField from '@/components/common/DateTimeField'
+import DateTimeField, { toMinutePrecisionIsoUtc } from '@/components/common/DateTimeField'
 import FormField from '@/components/common/FormField'
 import { Button } from '@/components/ui/button'
 
@@ -19,72 +19,74 @@ const PostOriginalCreatedTimeField: FC<Props> = (
       setOriginalCreatedFrom,
       originalCreatedBefore,
       setOriginalCreatedBefore,
-      errors }: Props) => (
-    <FormField label="オリジナルの作成日時" messages={errors}>
-      {({ describedBy, invalid }) => (
-	  <>
-	    <div className="my-1 flex flex-col gap-2 sm:flex-row sm:items-start">
-	      <div className="min-w-0 flex-1">
-		<DateTimeField
-		    className="w-full"
-		    disabled={disabled ?? false}
-		    aria-describedby={describedBy}
-		    aria-invalid={invalid}
-		    invalid={invalid}
-		    value={originalCreatedFrom ?? undefined}
-		    onChange={setOriginalCreatedFrom}
-		    onBlur={ev => {
-		      const v = ev.target.value
-		      if (!(v))
-			return
+      errors }: Props) => {
+  return (
+      <FormField label="オリジナルの作成日時" messages={errors}>
+	  {({ describedBy, invalid }) => (
+	      <>
+		<div className="my-1 flex flex-col gap-2 sm:flex-row sm:items-start">
+		  <div className="min-w-0 flex-1">
+		    <DateTimeField
+			className="w-full"
+			disabled={disabled ?? false}
+			aria-describedby={describedBy}
+			aria-invalid={invalid}
+			invalid={invalid}
+			value={originalCreatedFrom ?? undefined}
+			onChange={setOriginalCreatedFrom}
+			onBlur={ev => {
+			  const v = ev.target.value
+			  if (!(v))
+			    return
 
-		      const d = new Date (v)
-		      if (d.getMinutes () === 0 && d.getHours () === 0)
-			d.setDate (d.getDate () + 1)
-		      else
-			d.setMinutes (d.getMinutes () + 1)
-		      setOriginalCreatedBefore (d.toISOString ())
-		    }}/>
-		以降
-	      </div>
-	      <div>
-		<Button
-		    type="button"
-		    className="bg-gray-600 text-white rounded"
-		    disabled={disabled}
-		    onClick={() => {
-		      setOriginalCreatedFrom (null)
-		    }}>
-		  リセット
-		</Button>
-	      </div>
-	    </div>
+			  const d = new Date (v)
+			  if (d.getMinutes () === 0 && d.getHours () === 0)
+			    d.setDate (d.getDate () + 1)
+			  else
+			    d.setMinutes (d.getMinutes () + 1)
+			  setOriginalCreatedBefore (toMinutePrecisionIsoUtc (d.toISOString ()))
+			}}/>
+		    以降
+		  </div>
+		  <div>
+		    <Button
+			type="button"
+			className="bg-gray-600 text-white rounded"
+			disabled={disabled}
+			onClick={() => {
+			  setOriginalCreatedFrom (null)
+			}}>
+		      リセット
+		    </Button>
+		  </div>
+		</div>
 
-	    <div className="my-1 flex flex-col gap-2 sm:flex-row sm:items-start">
-	      <div className="min-w-0 flex-1">
-		<DateTimeField
-		    className="w-full"
-		    disabled={disabled}
-		    aria-describedby={describedBy}
-		    aria-invalid={invalid}
-		    invalid={invalid}
-		    value={originalCreatedBefore ?? undefined}
-		    onChange={setOriginalCreatedBefore}/>
-		より前
-	      </div>
-	      <div>
-		<Button
-		    type="button"
-		    className="bg-gray-600 text-white rounded"
-		    disabled={disabled}
-		    onClick={() => {
-		      setOriginalCreatedBefore (null)
-		    }}>
-		  リセット
-		</Button>
-	      </div>
-	    </div>
-	  </>)}
-    </FormField>)
+		<div className="my-1 flex flex-col gap-2 sm:flex-row sm:items-start">
+		  <div className="min-w-0 flex-1">
+		    <DateTimeField
+			className="w-full"
+			disabled={disabled}
+			aria-describedby={describedBy}
+			aria-invalid={invalid}
+			invalid={invalid}
+			value={originalCreatedBefore ?? undefined}
+			onChange={setOriginalCreatedBefore}/>
+		    より前
+		  </div>
+		  <div>
+		    <Button
+			type="button"
+			className="bg-gray-600 text-white rounded"
+			disabled={disabled}
+			onClick={() => {
+			  setOriginalCreatedBefore (null)
+			}}>
+		      リセット
+		    </Button>
+		  </div>
+		</div>
+	      </>)}
+      </FormField>)
+}
 
 export default PostOriginalCreatedTimeField

frontend/src/components/TopNav.test.tsx

@@ -8,7 +8,8 @@ const submenuItem = (role: 'guest' | 'member' | 'admin', section: string, item:
     user: buildUser ({ role }),
     wikiId: section === 'Wiki' ? 10 : null,
     pathName: section === 'Wiki' ? '/wiki/page' : '/posts' })
-  return menu.find (_1 => _1.name === section)?.subMenu.find (_1 => _1.name === item)
+  return menu.find (entry => entry.name === section)?.subMenu.find (
+      subMenuItem => subMenuItem.name === item)
 }
 
 describe ('menuOutline', () => {

frontend/src/components/TopNav.tsx

@@ -19,7 +19,7 @@ import type { FC, MouseEvent } from 'react'
 
 import type { Material, Menu, MenuVisibleItem, Tag, User } from '@/types'
 
-type Props = { user: User | null, }
+type Props = { user: User | null }
 
 
 export const menuOutline = (

frontend/src/components/common/DateTimeField.test.tsx

@@ -21,7 +21,8 @@ describe ('DateTimeField', () => {
     fireEvent.change (input, { target: { value: '' } })
 
     const first = handleChange.mock.calls[0]?.[0]
-    expect (new Date (first).getFullYear ()).toBe (2026)
+    expect (first).toMatch (/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}Z$/)
+    expect (new Date (first).getUTCSeconds ()).toBe (0)
     expect (handleChange).toHaveBeenLastCalledWith (null)
   })
 })

frontend/src/components/common/DateTimeField.tsx

@@ -8,13 +8,27 @@ import type { ComponentPropsWithoutRef, FC, FocusEvent } from 'react'
 const pad = (n: number): string => n.toString ().padStart (2, '0')
 
 
-const toDateTimeLocalValue = (d: Date) => {
-  const y = d.getFullYear ()
-  const m = pad (d.getMonth () + 1)
-  const day = pad (d.getDate ())
-  const h = pad (d.getHours ())
-  const min = pad (d.getMinutes ())
-  return `${ y }-${ m }-${ day }T${ h }:${ min }:00`
+const toDateTimeLocalValue = (value: Date) => {
+  const y = value.getFullYear ()
+  const m = pad (value.getMonth () + 1)
+  const day = pad (value.getDate ())
+  const h = pad (value.getHours ())
+  const min = pad (value.getMinutes ())
+  return `${ y }-${ m }-${ day }T${ h }:${ min }`
+}
+
+
+const toMinutePrecisionIsoUtc = (value: string) => {
+  const date = new Date (value)
+  if (Number.isNaN (date.getTime ()))
+    return value
+
+  const y = date.getUTCFullYear ()
+  const m = pad (date.getUTCMonth () + 1)
+  const day = pad (date.getUTCDate ())
+  const h = pad (date.getUTCHours ())
+  const min = pad (date.getUTCMinutes ())
+  return `${ y }-${ m }-${ day }T${ h }:${ min }Z`
 }
 
 
@@ -47,14 +61,16 @@ const DateTimeField: FC<Props> = ({ value, onChange, className, onBlur, invalid,
 			     'focus:ring-2 focus:ring-blue-200']),
 			 className)}
 	  type="datetime-local"
+	  step={60}
 	  value={local}
 	  aria-invalid={invalid}
 	  onChange={ev => {
 	    const v = ev.target.value
 	    setLocal (v)
-	    onChange?.(v ? (new Date (v)).toISOString () : null)
+	    onChange?.(v ? toMinutePrecisionIsoUtc (v) : null)
 	  }}
 	  onBlur={onBlur}/>)
 }
 
 export default DateTimeField
+export { toMinutePrecisionIsoUtc }

frontend/src/components/dialogues/DialogueProvider.tsx

@@ -86,7 +86,7 @@ const DialogueProvider: FC<Props> = ({ children }) => {
 
       return current.filter (request => request.id !== id)
     })
-    setPendingIds (current => current.filter (_1 => _1 !== id))
+    setPendingIds (current => current.filter (pendingId => pendingId !== id))
     setFormActions (current => {
 	const { [id]: _, ...rest } = current
 	return rest
@@ -140,15 +140,15 @@ const DialogueProvider: FC<Props> = ({ children }) => {
 
 	setPendingIds (current => [...current, id])
 	try
-	  {
-	    const shouldClose = await action.onSelect ()
-	    if (shouldClose !== false)
-	      closeRequest (id)
-	  }
+	{
+	  const shouldClose = await action.onSelect ()
+	  if (shouldClose !== false)
+	    closeRequest (id)
+	}
 	finally
-	  {
-	    setPendingIds (current => current.filter (_1 => _1 !== id))
-	  }
+	{
+	  setPendingIds (current => current.filter (pendingId => pendingId !== id))
+	}
       },
       [closeRequest, pendingIds])
 

frontend/src/components/posts/PostDurationField.tsx

@@ -0,0 +1,28 @@
+import PostTextField from '@/components/posts/PostTextField'
+
+import type { FC } from 'react'
+
+type Props = {
+  value:     string
+  onChange:  (value: string) => void
+  errors?:   string[]
+  disabled?: boolean }
+
+
+const PostDurationField: FC<Props> = (
+    { value,
+      onChange,
+      errors,
+      disabled },
+) => (
+    <PostTextField
+        label="動画時間"
+        value={value}
+        onChange={onChange}
+        errors={errors}
+        disabled={disabled}
+        type="text"
+        placeholder="例: 2 / 2.5 / 1:23"/>
+)
+
+export default PostDurationField

frontend/src/components/posts/PostTagsField.tsx

@@ -0,0 +1,29 @@
+import PostFormTagsArea from '@/components/PostFormTagsArea'
+import FieldWarning from '@/components/common/FieldWarning'
+
+import type { ComponentPropsWithoutRef, FC } from 'react'
+
+type Props = Omit<ComponentPropsWithoutRef<'textarea'>, 'value' | 'onChange'> & {
+  tags:      string
+  setTags:   (tags: string) => void
+  warnings?: string[]
+  errors?:   string[] }
+
+
+const PostTagsField: FC<Props> = (
+    { tags,
+      setTags,
+      warnings,
+      errors,
+      ...rest },
+) => (
+    <div className="space-y-2">
+      <PostFormTagsArea
+          {...rest}
+          tags={tags}
+          setTags={setTags}
+          errors={errors}/>
+      <FieldWarning messages={warnings}/>
+    </div>)
+
+export default PostTagsField

frontend/src/components/posts/PostTextField.tsx

@@ -0,0 +1,49 @@
+import FieldWarning from '@/components/common/FieldWarning'
+import FormField from '@/components/common/FormField'
+import { inputClass } from '@/lib/utils'
+
+import type { FC, ReactNode } from 'react'
+
+type Props = {
+  label:        string
+  value:        string
+  onChange:     (value: string) => void
+  warnings?:    string[]
+  errors?:      string[]
+  disabled?:    boolean
+  type?:        string
+  placeholder?: string
+  className?:   string
+  after?:       ReactNode }
+
+
+const PostTextField: FC<Props> = (
+    { label,
+      value,
+      onChange,
+      warnings,
+      errors,
+      disabled,
+      type = 'text',
+      placeholder,
+      className,
+      after },
+) => (
+    <FormField label={label} messages={errors}>
+      {({ describedBy, invalid }) => (
+          <>
+            <input
+                type={type}
+                value={value}
+                disabled={disabled}
+                placeholder={placeholder}
+                onChange={ev => onChange (ev.target.value)}
+                aria-describedby={describedBy}
+                aria-invalid={invalid}
+                className={inputClass (invalid, className)}/>
+            <FieldWarning messages={warnings}/>
+            {after}
+          </>)}
+    </FormField>)
+
+export default PostTextField

frontend/src/components/posts/PostThumbnailPreview.test.tsx

@@ -0,0 +1,12 @@
+import { render, screen } from '@testing-library/react'
+import { describe, expect, it } from 'vitest'
+
+import PostThumbnailPreview from '@/components/posts/PostThumbnailPreview'
+
+describe ('PostThumbnailPreview', () => {
+  it ('keeps an existing blob preview URL unchanged for normal post forms', () => {
+    render (<PostThumbnailPreview url="blob:preview" className="h-10 w-10"/>)
+
+    expect (screen.getByRole ('img')).toHaveAttribute ('src', 'blob:preview')
+  })
+})

frontend/src/components/posts/PostThumbnailPreview.tsx

@@ -0,0 +1,50 @@
+import { useEffect, useState } from 'react'
+
+import type { FC } from 'react'
+
+type Props = {
+  url:        string
+  alt?:       string
+  className?: string }
+
+
+const PostThumbnailPreview: FC<Props> = (
+    { url, alt = 'サムネール', className = 'h-16 w-16' },
+) => {
+  const [failed, setFailed] = useState (false)
+
+  useEffect (() => {
+    setFailed (false)
+  }, [url])
+
+  if (!(url))
+    {
+      return (
+          <div
+              className={`${ className } flex items-center justify-center rounded border
+                          border-border bg-muted text-xs text-muted-foreground`}>
+            なし
+          </div>)
+    }
+
+  if (failed)
+    {
+      return (
+          <div
+              className={`${ className } flex items-center justify-center rounded border
+                          border-amber-300 bg-amber-50 p-2 text-center text-xs
+                          text-amber-700 dark:border-amber-900 dark:bg-amber-950
+                          dark:text-amber-200`}>
+            サムネールを表示できません
+          </div>)
+    }
+
+  return (
+      <img
+          src={url}
+          alt={alt}
+          className={`${ className } rounded border border-border object-cover`}
+          onError={() => setFailed (true)}/>)
+}
+
+export default PostThumbnailPreview

frontend/src/components/posts/import/PostImportRowForm.test.tsx

@@ -1,12 +1,25 @@
 import { act, render, screen, waitFor } from '@testing-library/react'
-import { describe, expect, it, vi } from 'vitest'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
 
 import PostImportRowForm from '@/components/posts/import/PostImportRowForm'
 import { buildPostImportRow } from '@/test/postImportFactories'
 
 import type { DialogueFormAction, DialogueFormControls } from '@/lib/dialogues/useDialogue'
 
+const api = vi.hoisted (() => ({
+  apiGet: vi.fn (),
+}))
+
+vi.mock ('@/lib/api', () => api)
+
 describe ('PostImportRowForm', () => {
+  beforeEach (() => {
+    vi.clearAllMocks ()
+    globalThis.URL.createObjectURL = vi.fn (() => 'blob:preview')
+    globalThis.URL.revokeObjectURL = vi.fn ()
+    api.apiGet.mockResolvedValue (new Blob (['img'], { type: 'image/png' }))
+  })
+
   it ('resets only the draft, then saves with resetRequested', async () => {
     const row = buildPostImportRow ()
     row.attributes.title = 'manual title'
@@ -24,7 +37,7 @@ describe ('PostImportRowForm', () => {
     const titleInput = screen.getByDisplayValue ('manual title')
 
     await waitFor (() => expect (actions.at (-1)?.length).toBe (2))
-    const reset = actions.at (-1)?.find (_1 => _1.label === '変更をリセット')
+    const reset = actions.at (-1)?.find (action => action.label === '変更をリセット')
     expect (reset).toMatchObject ({ placement: 'start', variant: 'danger', disabled: false })
     await act (async () => {
       await reset?.onSelect ()
@@ -34,7 +47,7 @@ describe ('PostImportRowForm', () => {
     expect (titleInput).toHaveValue ('')
     expect (onSave).not.toHaveBeenCalled ()
 
-    const save = actions.at (-1)?.find (_1 => _1.label === '編輯内容を保存')
+    const save = actions.at (-1)?.find (action => action.label === '編輯内容を保存')
     await act (async () => {
       await save?.onSelect ()
     })
@@ -63,7 +76,7 @@ describe ('PostImportRowForm', () => {
     await waitFor (() => expect (actions.length).toBe (2))
 
     await act (async () => {
-      await actions.find (_1 => _1.label === '変更をリセット')?.onSelect ()
+      await actions.find (action => action.label === '変更をリセット')?.onSelect ()
     })
 
     expect (screen.getByDisplayValue ('manual title')).toBeInTheDocument ()
@@ -86,6 +99,163 @@ describe ('PostImportRowForm', () => {
     expect (screen.getByText ('duration error')).toBeInTheDocument ()
     expect (screen.getByText ('title warning')).toBeInTheDocument ()
     expect (screen.getAllByRole ('textbox').filter (
-	_1 => _1.getAttribute ('aria-invalid') === 'true')).toHaveLength (3)
+	textbox => textbox.getAttribute ('aria-invalid') === 'true')).toHaveLength (3)
+  })
+
+  it ('keeps untouched original created values unchanged in the save payload', async () => {
+    let actions: DialogueFormAction[] = []
+    const row = buildPostImportRow ({
+      attributes: {
+        originalCreatedFrom: '2024-01-01T12:34+09:00',
+        originalCreatedBefore: '2024-01-01T12:35+09:00' } })
+    const controls: DialogueFormControls = {
+      close: vi.fn (),
+      confirm: vi.fn (),
+      setActions: next => {
+        actions = next
+      } }
+    const onSave = vi.fn ().mockResolvedValue ({ saved: true, row: null })
+
+    render (
+        <PostImportRowForm
+            row={row}
+            controls={controls}
+            onSave={onSave}/>)
+    await waitFor (() => expect (actions.length).toBe (2))
+
+    await act (async () => {
+      void actions.find (action => action.label === '編輯内容を保存')?.onSelect ()
+    })
+
+    expect (onSave).toHaveBeenCalledWith ({
+      draft: expect.objectContaining ({
+        originalCreatedFrom: '2024-01-01T12:34+09:00',
+        originalCreatedBefore: '2024-01-01T12:35+09:00' }),
+      resetRequested: false })
+  })
+
+  it ('keeps the shared duration and tags string contract without leaking file upload UI', async () => {
+    let actions: DialogueFormAction[] = []
+    const controls: DialogueFormControls = {
+      close: vi.fn (),
+      confirm: vi.fn (),
+      setActions: next => {
+        actions = next
+      } }
+    const onSave = vi.fn ().mockResolvedValue ({ saved: true, row: null })
+
+    const { container } = render (
+        <PostImportRowForm
+            row={buildPostImportRow ({
+              attributes: { duration: '2', tags: 'tag1' } })}
+            controls={controls}
+            onSave={onSave}/>)
+    await waitFor (() => expect (actions.length).toBe (2))
+
+    expect (container.querySelector ('input[type="file"]')).toBeNull ()
+    expect (screen.getByPlaceholderText ('例: 2 / 2.5 / 1:23')).toHaveValue ('2')
+    expect (screen.getByDisplayValue ('tag1')).toBeInTheDocument ()
+
+    await act (async () => {
+      await actions.find (action => action.label === '編輯内容を保存')?.onSelect ()
+    })
+
+    expect (onSave).toHaveBeenCalledWith ({
+      draft: expect.objectContaining ({
+        duration: '2',
+        tags: 'tag1' }),
+      resetRequested: false })
+  })
+
+  it ('keeps reset enabled when the value matches but provenance still differs', async () => {
+    const row = buildPostImportRow ({
+      attributes: { title: 'same title' },
+      provenance: { title: 'manual' },
+      resetSnapshot: {
+        url: 'https://example.com/post',
+        attributes: {
+          title: 'same title',
+          thumbnailBase: '',
+          originalCreatedFrom: '',
+          originalCreatedBefore: '',
+          duration: '',
+          tags: '',
+          parentPostIds: '' },
+        provenance: {
+          url: 'manual',
+          title: 'automatic',
+          thumbnailBase: 'automatic',
+          originalCreatedFrom: 'automatic',
+          originalCreatedBefore: 'automatic',
+          duration: 'automatic',
+          tags: 'automatic',
+          parentPostIds: 'automatic' },
+        tagSources: { automatic: '', manual: '' },
+        fieldWarnings: { },
+        baseWarnings: [] } })
+    let actions: DialogueFormAction[] = []
+
+    render (
+        <PostImportRowForm
+            row={row}
+            controls={{
+              close: vi.fn (),
+              confirm: vi.fn (),
+              setActions: next => {
+                actions = next
+              } }}
+            onSave={vi.fn ()}/>)
+    await waitFor (() => expect (actions.length).toBe (2))
+
+    expect (actions.find (action => action.label === '変更をリセット')?.disabled).toBe (false)
+  })
+
+  it ('disables every field while save validation is pending and re-enables them afterwards', async () => {
+    let actions: DialogueFormAction[] = []
+    let resolveSave:
+        ((value: { saved: boolean
+		   row:   ReturnType<typeof buildPostImportRow> | null }) => void) | null
+        = null
+    const onSave = vi.fn (() =>
+        new Promise<{ saved: boolean
+		      row:   ReturnType<typeof buildPostImportRow> | null }> (resolve => {
+          resolveSave = resolve
+        }))
+
+    render (
+        <PostImportRowForm
+            row={buildPostImportRow ({ attributes: { title: 'draft title' } })}
+            controls={{
+              close: vi.fn (),
+              confirm: vi.fn (),
+              setActions: next => {
+                actions = next
+              } }}
+            onSave={onSave}/>)
+    await waitFor (() => expect (actions.length).toBe (2))
+
+    await act (async () => {
+      await actions.find (action => action.label === '編輯内容を保存')?.onSelect ()
+    })
+
+    await waitFor (() => {
+      screen.getAllByRole ('textbox').forEach (textbox => {
+        expect (textbox).toBeDisabled ()
+      })
+    })
+
+    resolveSave?.({
+      saved: false,
+      row: buildPostImportRow ({
+        attributes: { title: 'draft title' },
+        validationErrors: { title: ['タイトルを確認してください．'] } }) })
+
+    await waitFor (() => {
+      screen.getAllByRole ('textbox').forEach (textbox => {
+        expect (textbox).not.toBeDisabled ()
+      })
+    })
+    expect (screen.getByDisplayValue ('draft title')).toBeInTheDocument ()
+    expect (screen.getByText ('タイトルを確認してください．')).toBeInTheDocument ()
   })
 })

frontend/src/components/posts/import/PostImportRowForm.tsx

@@ -3,25 +3,17 @@ import { useCallback, useEffect, useMemo, useState } from 'react'
 import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
 import FieldError from '@/components/common/FieldError'
 import FieldWarning from '@/components/common/FieldWarning'
-import FormField from '@/components/common/FormField'
-import TextArea from '@/components/common/TextArea'
-import ThumbnailPreview from '@/components/posts/import/ThumbnailPreview'
-import { inputClass } from '@/lib/utils'
+import PostDurationField from '@/components/posts/PostDurationField'
+import PostTagsField from '@/components/posts/PostTagsField'
+import PostTextField from '@/components/posts/PostTextField'
+import PostImportThumbnailPreview from '@/components/posts/import/PostImportThumbnailPreview'
 
 import type { FC } from 'react'
 
-import type { PostImportRow } from '@/lib/postImportSession'
+import type { PostImportEditableDraft, PostImportRow } from '@/lib/postImportSession'
 import type { DialogueFormControls } from '@/lib/dialogues/useDialogue'
 
-type Draft = {
-  url:                   string
-  title:                 string
-  thumbnailBase:         string
-  originalCreatedFrom:   string
-  originalCreatedBefore: string
-  duration:              string
-  tags:                  string
-  parentPostIds:         string }
+type Draft = PostImportEditableDraft
 
 type Props = {
   row:          PostImportRow
@@ -52,7 +44,7 @@ const buildResetDraft = (row: PostImportRow): Draft => ({
     parentPostIds: String (row.resetSnapshot.attributes.parentPostIds ?? '') })
 
 const groupedMessages = (...values: (string[] | undefined)[]): string[] =>
-    values.flatMap (value => value ?? [])
+    [...new Set (values.flatMap (value => value ?? []))]
 
 const sameDraft = (left:  Draft, right: Draft): boolean =>
     left.url === right.url
@@ -64,6 +56,19 @@ const sameDraft = (left:  Draft, right: Draft): boolean =>
     && left.tags === right.tags
     && left.parentPostIds === right.parentPostIds
 
+const sameProvenance = (
+    current: PostImportRow['provenance'],
+    reset:   PostImportRow['resetSnapshot']['provenance'],
+): boolean =>
+    Object.keys (reset).every (field => current[field] === reset[field])
+
+const sameTagSources = (
+    current: PostImportRow['tagSources'],
+    reset:   PostImportRow['resetSnapshot']['tagSources'],
+): boolean =>
+    (current?.automatic ?? '') === reset.automatic
+    && (current?.manual ?? '') === reset.manual
+
 
 const PostImportRowForm: FC<Props> = (
     { row,
@@ -86,7 +91,12 @@ const PostImportRowForm: FC<Props> = (
   const resetDraft = useMemo (
       () => buildResetDraft (row),
       [row])
-  const resetDisabled = saving || sameDraft (draft, resetDraft)
+  const resetDisabled =
+      saving
+      || (sameDraft (draft, resetDraft)
+          && sameProvenance (row.provenance, row.resetSnapshot.provenance)
+          && sameTagSources (row.tagSources, row.resetSnapshot.tagSources)
+          && row.metadataUrl === row.resetSnapshot.metadataUrl)
 
   const update = <Key extends keyof Draft,> (
       key:   Key,
@@ -119,19 +129,19 @@ const PostImportRowForm: FC<Props> = (
   const save = useCallback (async (): Promise<boolean> => {
     setSaving (true)
     try
-      {
-	const result = await onSave ({ draft, resetRequested })
-	if (result.saved)
-	  return true
+    {
+      const result = await onSave ({ draft, resetRequested })
+      if (result.saved)
+        return true
 
-	if (result.row != null)
-	  setMessageRow (result.row)
-	return false
-      }
+      if (result.row != null)
+        setMessageRow (result.row)
+      return false
+    }
     finally
-      {
-	setSaving (false)
-      }
+    {
+      setSaving (false)
+    }
   }, [draft, onSave, resetRequested])
 
   useEffect (() => {
@@ -153,37 +163,41 @@ const PostImportRowForm: FC<Props> = (
 	  <div className="space-y-4">
 	    <div className="grid gap-6 md:grid-cols-[7rem_minmax(0,1fr)]">
 	      <div className="space-y-3 md:sticky md:top-0 md:self-start">
-		<ThumbnailPreview
+		<PostImportThumbnailPreview
 		    url={draft.thumbnailBase}
 		    className="h-28 w-28"/>
 	      </div>
 
 	      <div className="space-y-4">
-		<PostImportTextField
+		<PostTextField
 		    label="URL"
 		    value={draft.url}
+		    disabled={saving}
 		    warnings={displayRow.fieldWarnings.url}
 		    errors={groupedMessages (
 			displayRow.validationErrors.url,
 			displayRow.importErrors?.url)}
 		    onChange={value => update ('url', value)}/>
-		<PostImportTextField
+		<PostTextField
 		    label="タイトル"
 		    value={draft.title}
+		    disabled={saving}
 		    warnings={displayRow.fieldWarnings.title}
 		    errors={groupedMessages (
 			displayRow.validationErrors.title,
 			displayRow.importErrors?.title)}
 		    onChange={value => update ('title', value)}/>
-		<PostImportTextField
+		<PostTextField
 		    label="サムネール基底 URL"
 		    value={draft.thumbnailBase}
+		    disabled={saving}
 		    warnings={displayRow.fieldWarnings.thumbnailBase}
 		    errors={groupedMessages (
 			displayRow.validationErrors.thumbnailBase,
 			displayRow.importErrors?.thumbnailBase)}
 		    onChange={value => update ('thumbnailBase', value)}/>
 		<PostOriginalCreatedTimeField
+		    disabled={saving}
 		    originalCreatedFrom={draft.originalCreatedFrom || null}
 		    setOriginalCreatedFrom={value => update ('originalCreatedFrom', value ?? '')}
 		    originalCreatedBefore={draft.originalCreatedBefore || null}
@@ -195,26 +209,28 @@ const PostImportRowForm: FC<Props> = (
 			displayRow.importErrors?.originalCreatedAt,
 			displayRow.importErrors?.originalCreatedFrom,
 			displayRow.importErrors?.originalCreatedBefore)}/>
-		<PostImportTextField
-		    label="動画時間"
+		<PostDurationField
 		    value={draft.duration}
+		    disabled={saving}
 		    errors={groupedMessages (
 			displayRow.validationErrors.duration,
 			displayRow.validationErrors.videoMs,
 			displayRow.importErrors?.duration,
 			displayRow.importErrors?.videoMs)}
 		    onChange={value => update ('duration', value)}/>
-		<PostImportAreaField
-		    label="タグ"
-		    value={draft.tags}
+		<PostTagsField
+		    tags={draft.tags}
+		    disabled={saving}
+		    setTags={value => update ('tags', value)}
 		    warnings={displayRow.fieldWarnings.tags}
 		    errors={groupedMessages (
 			displayRow.validationErrors.tags,
 			displayRow.importErrors?.tags)}
-		    onChange={value => update ('tags', value)}/>
-		<PostImportTextField
+		    rows={4}/>
+		<PostTextField
 		    label="親投稿"
 		    value={draft.parentPostIds}
+		    disabled={saving}
 		    errors={groupedMessages (
 			displayRow.validationErrors.parentPostIds,
 			displayRow.importErrors?.parentPostIds)}
@@ -229,49 +245,6 @@ const PostImportRowForm: FC<Props> = (
       </>)
 }
 
-const PostImportTextField = (
-    { label, value, warnings, errors, onChange }: {
-	label:    string
-	value:    string
-	warnings?: string[]
-	errors?:  string[]
-	onChange: (value: string) => void },
-) => (
-    <FormField label={label} messages={errors}>
-      {({ describedBy, invalid }) => (
-	  <>
-	    <input
-		value={value}
-		onChange={ev => onChange (ev.target.value)}
-		aria-describedby={describedBy}
-		aria-invalid={invalid}
-		className={inputClass (invalid)}/>
-	    <FieldWarning messages={warnings}/>
-	  </>)}
-    </FormField>)
-
-const PostImportAreaField = (
-    { label, value, warnings, errors, onChange }: {
-	label:    string
-	value:    string
-	warnings?: string[]
-	errors?:  string[]
-	onChange: (value: string) => void },
-) => (
-    <FormField label={label} messages={errors}>
-      {({ describedBy, invalid }) => (
-	  <>
-	    <TextArea
-		value={value}
-		rows={4}
-		onChange={ev => onChange (ev.target.value)}
-		aria-describedby={describedBy}
-		invalid={invalid}
-		className="h-auto"/>
-	    <FieldWarning messages={warnings}/>
-	  </>)}
-    </FormField>)
-
 export default PostImportRowForm
 export { buildDraft }
 export type { Draft as PostImportRowDraft }

frontend/src/components/posts/import/PostImportRowSummary.tsx

@@ -1,17 +1,18 @@
 import { Button } from '@/components/ui/button'
-import { cn } from '@/lib/utils'
-
+import PostImportThumbnailPreview from '@/components/posts/import/PostImportThumbnailPreview'
 import PostImportStatusBadge from '@/components/posts/import/PostImportStatusBadge'
-import ThumbnailPreview from '@/components/posts/import/ThumbnailPreview'
 import { displayPostImportStatus } from '@/components/posts/import/postImportRowStatus'
+import { canEditReviewRow } from '@/lib/postImportSession'
+import { cn, originalCreatedAtString } from '@/lib/utils'
 
 import type { FC } from 'react'
 
 import type { PostImportRow } from '@/lib/postImportSession'
 
 type Props = {
-    row:     PostImportRow
-    onEdit:  () => void }
+    row:           PostImportRow
+    onEdit:        () => void
+    editDisabled?: boolean }
 
 const summaryWarning = (row: PostImportRow): string | null =>
     Object.values (row.fieldWarnings ?? { }).flat ()[0]
@@ -19,94 +20,101 @@ const summaryWarning = (row: PostImportRow): string | null =>
     ?? null
 
 const summaryDate = (row: PostImportRow): string =>
-    [row.attributes.originalCreatedFrom, row.attributes.originalCreatedBefore]
-	.filter (_1 => typeof _1 === 'string' && _1 !== '')
-	.join (' ～ ')
+    originalCreatedAtString (
+	row.attributes.originalCreatedFrom?.toString () ?? null,
+	row.attributes.originalCreatedBefore?.toString () ?? null)
 
 
-const PostImportRowSummary: FC<Props> = ({ row, onEdit }) => {
-    const warning = summaryWarning (row)
-    const displayStatus = displayPostImportStatus (row)
+const PostImportRowSummary: FC<Props> = ({ row, onEdit, editDisabled }) => {
+  const warning = summaryWarning (row)
+  const displayStatus = displayPostImportStatus (row)
 
-    return (
-	<>
-	  <div
-	      className={cn (
-		  'hidden items-center gap-4 rounded-lg border p-4 md:grid',
-		  'md:grid-cols-[4rem_5rem_minmax(0,1fr)_auto_auto]',
-		  'transition-shadow hover:shadow-sm')}>
-	    <div className="space-y-1">
-	      <div className="text-sm font-medium">#{row.sourceRow}</div>
-	    </div>
-	    <ThumbnailPreview
-		url={String (row.attributes.thumbnailBase ?? '')}
-		className="h-16 w-16"/>
-	    <div className="min-w-0 space-y-1">
-	      <div className="line-clamp-2 text-sm font-medium">
-		{String (row.attributes.title ?? '') || '（タイトル未取得）'}
-	      </div>
-	      <div className="truncate text-xs text-neutral-600 dark:text-neutral-300">
-		{row.url}
-	      </div>
-	      <div className="truncate text-xs text-neutral-500 dark:text-neutral-400">
-		{String (row.attributes.tags ?? '') || 'タグなし'}
-	      </div>
-	      <div className="text-xs text-neutral-500 dark:text-neutral-400">
-		{summaryDate (row) || '日時未取得'}
-		{row.attributes.duration ? ` / ${ row.attributes.duration }` : ''}
-	      </div>
-	      {warning && (
-		  <div className="text-xs text-amber-700 dark:text-amber-200">
-		    {warning}
-		  </div>)}
-	    </div>
-	    <div className="space-y-1">
-	      {displayStatus != null && <PostImportStatusBadge value={displayStatus}/>}
-	    </div>
-	    <div className="flex justify-end">
-	      <Button
-		  type="button"
-		  variant="outline"
-		  onClick={onEdit}
-		  disabled={row.importStatus === 'created'}>
-		編輯
-	      </Button>
-	    </div>
-	  </div>
+  return (
+      <>
+        <div
+            className={cn (
+                'hidden items-center gap-4 rounded-lg border p-4 md:grid',
+                'md:grid-cols-[4rem_5rem_minmax(0,1fr)_auto_auto]',
+                'transition-shadow hover:shadow-sm')}>
+          <div className="space-y-1">
+            <div className="text-sm font-medium">#{row.sourceRow}</div>
+          </div>
+          <PostImportThumbnailPreview
+              url={String (row.attributes.thumbnailBase ?? '')}
+              className="h-16 w-16"/>
+          <div className="min-w-0 space-y-1">
+            <div className="line-clamp-2 text-sm font-medium">
+              {String (row.attributes.title ?? '') || '（タイトル未取得）'}
+            </div>
+            <div className="truncate text-xs text-neutral-600 dark:text-neutral-300">
+              {row.url}
+            </div>
+            <div className="truncate text-xs text-neutral-500 dark:text-neutral-400">
+              {String (row.attributes.tags ?? '') || 'タグなし'}
+            </div>
+            <div className="text-xs text-neutral-500 dark:text-neutral-400">
+              {summaryDate (row)}
+              {row.attributes.duration ? ` / ${ row.attributes.duration }` : ''}
+            </div>
+            {warning && (
+                <div className="text-xs text-amber-700 dark:text-amber-200">
+                  {warning}
+                </div>)}
+          </div>
+          <div className="space-y-1">
+            {displayStatus != null && <PostImportStatusBadge value={displayStatus}/>}
+          </div>
+          <div className="flex justify-end">
+            <Button
+                type="button"
+                variant="outline"
+                onClick={onEdit}
+                disabled={!(canEditReviewRow (row)) || editDisabled === true}>
+              編輯
+            </Button>
+          </div>
+        </div>
 
-	  <div
-	      className={cn (
-		  'space-y-3 rounded-lg border p-4 md:hidden',
-		  'transition-shadow hover:shadow-sm')}>
-	    <div className="flex items-start gap-3">
-	      <ThumbnailPreview
-		  url={String (row.attributes.thumbnailBase ?? '')}
-		  className="h-20 w-20 shrink-0"/>
-	      <div className="min-w-0 flex-1 space-y-2">
-		<div className="line-clamp-2 text-sm font-medium">
-		  {String (row.attributes.title ?? '') || '（タイトル未取得）'}
-		</div>
-		<div className="truncate text-xs text-neutral-600 dark:text-neutral-300">
-		  {row.url}
-		</div>
-		<div className="flex flex-wrap gap-2">
-		  {displayStatus != null && <PostImportStatusBadge value={displayStatus}/>}
-		</div>
-		{warning && (
-		    <div className="text-xs text-amber-700 dark:text-amber-200">
-		      {warning}
-		    </div>)}
-	      </div>
-	    </div>
-	    <Button
-		type="button"
-		variant="outline"
-		onClick={onEdit}
-		disabled={row.importStatus === 'created'}>
-	      編輯
-	    </Button>
-	  </div>
-	</>)
+        <div
+            className={cn (
+                'space-y-3 rounded-lg border p-4 md:hidden',
+                'transition-shadow hover:shadow-sm')}>
+          <div className="flex items-start gap-3">
+            <PostImportThumbnailPreview
+                url={String (row.attributes.thumbnailBase ?? '')}
+                className="h-20 w-20 shrink-0"/>
+            <div className="min-w-0 flex-1 space-y-2">
+              <div className="line-clamp-2 text-sm font-medium">
+                {String (row.attributes.title ?? '') || '（タイトル未取得）'}
+              </div>
+              <div className="truncate text-xs text-neutral-600 dark:text-neutral-300">
+                {row.url}
+              </div>
+              <div className="flex flex-wrap gap-2">
+                {displayStatus != null && <PostImportStatusBadge value={displayStatus}/>}
+              </div>
+              <div className="text-xs text-neutral-500 dark:text-neutral-400">
+                {String (row.attributes.tags ?? '') || 'タグなし'}
+              </div>
+              <div className="text-xs text-neutral-500 dark:text-neutral-400">
+                {summaryDate (row)}
+                {row.attributes.duration ? ` / ${ row.attributes.duration }` : ''}
+              </div>
+              {warning && (
+                  <div className="text-xs text-amber-700 dark:text-amber-200">
+                    {warning}
+                  </div>)}
+            </div>
+          </div>
+          <Button
+              type="button"
+              variant="outline"
+              onClick={onEdit}
+              disabled={!(canEditReviewRow (row)) || editDisabled === true}>
+            編輯
+          </Button>
+        </div>
+      </>)
 }
 
 export default PostImportRowSummary

frontend/src/components/posts/import/PostImportThumbnailPreview.test.tsx

@@ -0,0 +1,78 @@
+import { render, screen, waitFor } from '@testing-library/react'
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+import PostImportThumbnailPreview from '@/components/posts/import/PostImportThumbnailPreview'
+
+const api = vi.hoisted (() => ({
+  apiGet: vi.fn (),
+}))
+
+vi.mock ('@/lib/api', () => api)
+
+describe ('PostImportThumbnailPreview', () => {
+  beforeEach (() => {
+    vi.clearAllMocks ()
+    globalThis.URL.createObjectURL = vi.fn (() => 'blob:preview')
+    globalThis.URL.revokeObjectURL = vi.fn ()
+  })
+
+  it ('uses a backend-fetched blob URL instead of the external thumbnail URL directly', async () => {
+    api.apiGet.mockResolvedValueOnce (new Blob (['img'], { type: 'image/png' }))
+
+    render (
+        <PostImportThumbnailPreview
+            url="https://example.com/thumbnail.jpg"
+            className="h-10 w-10"/>)
+
+    await waitFor (() => {
+      expect (screen.getByRole ('img')).toHaveAttribute ('src', 'blob:preview')
+    })
+    expect (screen.getByRole ('img')).not.toHaveAttribute (
+        'src',
+        'https://example.com/thumbnail.jpg')
+    expect (api.apiGet).toHaveBeenCalledWith ('/preview/thumbnail', {
+      params: { url: 'https://example.com/thumbnail.jpg' },
+      responseType: 'blob' })
+  })
+
+  it ('does not render the unsafe URL directly when preview fetching fails', async () => {
+    api.apiGet.mockRejectedValueOnce (new Error ('unsafe'))
+
+    render (
+        <PostImportThumbnailPreview
+            url="http://127.0.0.1/private.png"
+            className="h-10 w-10"/>)
+
+    expect (await screen.findByText ('サムネールを表示できません')).toBeInTheDocument ()
+    expect (screen.queryByRole ('img')).toBeNull ()
+  })
+
+  it ('revokes the old object URL when the source URL changes', async () => {
+    const createObjectUrlMock =
+        globalThis.URL.createObjectURL as unknown as ReturnType<typeof vi.fn>
+    createObjectUrlMock
+        .mockReturnValueOnce ('blob:first')
+        .mockReturnValueOnce ('blob:second')
+    api.apiGet
+        .mockResolvedValueOnce (new Blob (['first'], { type: 'image/png' }))
+        .mockResolvedValueOnce (new Blob (['second'], { type: 'image/png' }))
+
+    const { rerender } = render (
+        <PostImportThumbnailPreview
+            url="https://example.com/first.jpg"
+            className="h-10 w-10"/>)
+    await waitFor (() => {
+      expect (screen.getByRole ('img')).toHaveAttribute ('src', 'blob:first')
+    })
+
+    rerender (
+        <PostImportThumbnailPreview
+            url="https://example.com/second.jpg"
+            className="h-10 w-10"/>)
+
+    await waitFor (() => {
+      expect (screen.getByRole ('img')).toHaveAttribute ('src', 'blob:second')
+    })
+    expect (globalThis.URL.revokeObjectURL).toHaveBeenCalledWith ('blob:first')
+  })
+})

frontend/src/components/posts/import/PostImportThumbnailPreview.tsx

@@ -0,0 +1,89 @@
+import { useEffect, useRef, useState } from 'react'
+
+import PostThumbnailPreview from '@/components/posts/PostThumbnailPreview'
+import { apiGet } from '@/lib/api'
+import { cn } from '@/lib/utils'
+
+import type { FC } from 'react'
+
+type Props = {
+  url:        string
+  alt?:       string
+  className?: string }
+
+
+const PostImportThumbnailPreview: FC<Props> = (
+    { url,
+      alt = 'サムネール',
+      className = 'h-16 w-16' },
+) => {
+  const [previewUrl, setPreviewUrl] = useState ('')
+  const [unavailable, setUnavailable] = useState (false)
+  const previewUrlRef = useRef ('')
+
+  useEffect (() => {
+    if (previewUrlRef.current)
+      {
+        URL.revokeObjectURL (previewUrlRef.current)
+        previewUrlRef.current = ''
+      }
+    setPreviewUrl ('')
+    setUnavailable (false)
+
+    if (!(url))
+      return
+
+    let active = true
+
+    const loadPreview = async () => {
+      try
+      {
+        const blob = await apiGet<Blob> ('/preview/thumbnail', {
+            params: { url },
+            responseType: 'blob' })
+        if (!(active))
+          return
+
+        const nextPreviewUrl = URL.createObjectURL (blob)
+        previewUrlRef.current = nextPreviewUrl
+        setPreviewUrl (nextPreviewUrl)
+      }
+      catch
+      {
+        if (active)
+          setUnavailable (true)
+      }
+    }
+
+    void loadPreview ()
+
+    return () => {
+      active = false
+      if (previewUrlRef.current)
+        {
+          URL.revokeObjectURL (previewUrlRef.current)
+          previewUrlRef.current = ''
+        }
+    }
+  }, [url])
+
+  if (unavailable)
+    {
+      return (
+          <div
+              className={`${ className } flex items-center justify-center rounded border
+                          border-amber-300 bg-amber-50 p-2 text-center text-xs
+                          text-amber-700 dark:border-amber-900 dark:bg-amber-950
+                          dark:text-amber-200`}>
+            サムネールを表示できません
+          </div>)
+    }
+
+  return (
+      <PostThumbnailPreview
+          url={previewUrl}
+          alt={alt}
+          className={className}/>)
+}
+
+export default PostImportThumbnailPreview

frontend/src/components/posts/import/ThumbnailPreview.tsx

@@ -1,49 +0,0 @@
-import { useEffect, useState } from 'react'
-
-import type { FC } from 'react'
-
-
-type Props = {
-    url:       string
-    alt?:      string
-    className?: string }
-
-
-const ThumbnailPreview: FC<Props> = ({ url, alt = 'サムネール', className = 'h-16 w-16' }) => {
-    const [failed, setFailed] = useState (false)
-
-    useEffect (() => {
-	setFailed (false)
-    }, [url])
-
-    if (!(url))
-      {
-	return (
-	    <div
-		className={`${ className } flex items-center justify-center rounded border
-			    border-border bg-muted text-xs text-muted-foreground`}>
-	      なし
-	    </div>)
-      }
-
-    if (failed)
-      {
-	return (
-	    <div
-		className={`${ className } flex items-center justify-center rounded border
-			    border-amber-300 bg-amber-50 p-2 text-center text-xs
-			    text-amber-700 dark:border-amber-900 dark:bg-amber-950
-			    dark:text-amber-200`}>
-	      サムネールを表示できません
-	    </div>)
-      }
-
-    return (
-	<img
-	    src={url}
-	    alt={alt}
-	    className={`${ className } rounded border border-border object-cover`}
-	    onError={() => setFailed (true)}/>)
-}
-
-export default ThumbnailPreview

frontend/src/components/posts/import/postImportRowStatus.ts

@@ -5,7 +5,7 @@ export type PostImportDisplayStatus = 'ready' | 'skipped' | 'warning'
 export type PostImportBadgeValue = PostImportDisplayStatus
 
 const hasWarnings = (row: PostImportRow): boolean =>
-    Object.values (row.fieldWarnings ?? { }).some (_1 => _1.length > 0)
+    Object.values (row.fieldWarnings ?? { }).some (messages => messages.length > 0)
     || row.baseWarnings.length > 0
 
 export const displayPostImportStatus = (

frontend/src/lib/postImportRows.test.ts

@@ -1,10 +1,19 @@
 import { describe, expect, it } from 'vitest'
 
 import { creatableImportRows,
+	 buildNextEditedRow,
+	 canEditResultRow,
+	 canEditReviewRow,
+	 canRetryResultRow,
+	 hasExactSourceRows,
 	 initialisePreviewRows,
 	 mergeImportResults,
+	 mergeValidatedImportRow,
 	 mergeValidatedImportRows,
 	 processableImportRows,
+	 replaceImportRow,
+	 resultRepairMode,
+	 resultRowMessages,
 	 resultSummaryCounts,
 	 retryImportRow,
 	 reviewSummaryCounts } from '@/lib/postImportSession'
@@ -82,13 +91,16 @@ describe ('post import row state', () => {
   it ('merges result states and clears incompatible post identifiers', () => {
     const created = mergeImportResults ([buildPostImportRow ({
       skipReason: 'existing',
-      existingPostId: 2 })], [{
+      existingPostId: 2,
+      recoverable: true,
+      importStatus: 'pending' })], [{
       sourceRow: 1,
       status: 'created',
       post: { id: 3 } }])[0]
     const skipped = mergeImportResults ([buildPostImportRow ({
       createdPostId: 3,
-      importStatus: 'created' })], [{
+      importStatus: 'created',
+      recoverable: true })], [{
       sourceRow: 1,
       status: 'skipped',
       existingPostId: 4 }])[0]
@@ -97,20 +109,24 @@ describe ('post import row state', () => {
       existingPostId: 4 })], [{
       sourceRow: 1,
       status: 'failed',
+      recoverable: true,
       errors: { base: ['failure'] } }])[0]
 
     expect (created).toMatchObject ({
       importStatus: 'created',
       createdPostId: 3,
       existingPostId: undefined,
+      recoverable: undefined,
       skipReason: undefined })
     expect (skipped).toMatchObject ({
       importStatus: 'skipped',
       existingPostId: 4,
       createdPostId: undefined,
+      recoverable: undefined,
       skipReason: 'existing' })
     expect (failed).toMatchObject ({
       importStatus: 'failed',
+      recoverable: true,
       createdPostId: undefined,
       existingPostId: undefined,
       skipReason: undefined,
@@ -123,12 +139,103 @@ describe ('post import row state', () => {
       buildPostImportRow ({ sourceRow: 2, importStatus: 'skipped',
 	existingPostId: 2, skipReason: 'existing' }),
       buildPostImportRow ({ sourceRow: 3, importStatus: 'failed',
-	importErrors: { base: ['failed'] } })]
+	recoverable: true, importErrors: { base: ['failed'] } }),
+      buildPostImportRow ({ sourceRow: 4, importStatus: 'pending',
+	recoverable: true, validationErrors: { base: ['failed'] } })]
 
-    expect (resultSummaryCounts (rows)).toEqual ({ created: 1, skipped: 1, failed: 1 })
+    expect (resultSummaryCounts (rows)).toEqual ({ created: 1, skipped: 1, failed: 2 })
     expect (retryImportRow (rows, 3)[2]).toMatchObject ({
       importStatus: 'pending',
       importErrors: undefined })
+    expect (retryImportRow (rows, 4)[3]).toBe (rows[3])
+  })
+
+  it ('deduplicates messages and keeps repair mode only for repairable rows', () => {
+    const repairable = buildPostImportRow ({
+      sourceRow: 1,
+      importStatus: 'pending',
+      validationErrors: { title: ['invalid'], base: ['duplicate'] },
+      importErrors: { base: ['duplicate'], url: ['network'] } })
+    const complete = buildPostImportRow ({
+      sourceRow: 2,
+      importStatus: 'created',
+      createdPostId: 2 })
+
+    expect (resultRowMessages (repairable)).toEqual (['invalid', 'duplicate', 'network'])
+    expect (resultRepairMode ([repairable, complete])).toBe ('failed')
+    expect (resultRepairMode ([complete])).toBe ('all')
+  })
+
+  it ('classifies editable and retryable rows by terminal and recoverable state', () => {
+    const ready = buildPostImportRow ()
+    const skipped = buildPostImportRow ({
+      importStatus: 'skipped',
+      skipReason: 'existing',
+      existingPostId: 2 })
+    const hardFailed = buildPostImportRow ({
+      importStatus: 'failed',
+      importErrors: { base: ['failed'] } })
+    const pendingInvalid = buildPostImportRow ({
+      importStatus: 'pending',
+      recoverable: true,
+      validationErrors: { title: ['invalid'] } })
+    const pendingValid = buildPostImportRow ({
+      importStatus: 'pending',
+      recoverable: true })
+
+    expect (canEditReviewRow (ready)).toBe (true)
+    expect (canEditReviewRow (skipped)).toBe (false)
+    expect (canEditReviewRow (hardFailed)).toBe (false)
+    expect (canEditResultRow (pendingInvalid)).toBe (true)
+    expect (canRetryResultRow (pendingInvalid)).toBe (false)
+    expect (canRetryResultRow (pendingValid)).toBe (true)
+  })
+
+  it ('detects missing, duplicate, and extra source rows exactly', () => {
+    expect (hasExactSourceRows ([1, 2], [{ sourceRow: 1 }, { sourceRow: 2 }])).toBe (true)
+    expect (hasExactSourceRows ([1, 2], [{ sourceRow: 1 }])).toBe (false)
+    expect (hasExactSourceRows ([1, 2], [{ sourceRow: 1 }, { sourceRow: 1 }])).toBe (false)
+    expect (hasExactSourceRows ([1, 2], [{ sourceRow: 1 }, { sourceRow: 3 }])).toBe (false)
+  })
+
+  it ('merges only the validated source row and preserves other row edits', () => {
+    const edited = buildPostImportRow ({
+      sourceRow: 1,
+      attributes: { title: 'edited row' },
+      provenance: { title: 'manual' } })
+    const other = buildPostImportRow ({
+      sourceRow: 2,
+      attributes: { title: 'keep me' },
+      provenance: { title: 'manual' } })
+    const validated = buildPostImportRow ({
+      sourceRow: 1,
+      attributes: { title: 'validated row' } })
+
+    const result = mergeValidatedImportRow ([edited, other], validated)
+
+    expect (result[0]?.attributes.title).toBe ('validated row')
+    expect (result[1]?.attributes.title).toBe ('keep me')
+  })
+
+  it ('replaces only the targeted source row and preserves the others', () => {
+    const original = buildPostImportRow ({
+      sourceRow: 1,
+      importStatus: 'failed',
+      recoverable: true,
+      importErrors: { base: ['failed'] } })
+    const other = buildPostImportRow ({
+      sourceRow: 2,
+      attributes: { title: 'keep edited row' } })
+    const restored = buildPostImportRow ({
+      sourceRow: 1,
+      importStatus: 'failed',
+      recoverable: true,
+      importErrors: { base: ['failed'] } })
+
+    const result = replaceImportRow ([original, other], restored)
+
+    expect (result[0]).toEqual (restored)
+    expect (result[1]?.attributes.title).toBe ('keep edited row')
   })
 
   it ('copies reset snapshot values instead of sharing mutable records', () => {
@@ -144,4 +251,38 @@ describe ('post import row state', () => {
     expect (initialised.resetSnapshot.attributes.title).toBe ('')
     expect (initialised.resetSnapshot.fieldWarnings.title).toEqual (['warning'])
   })
+
+  it ('builds the next edited row with shared repair semantics', () => {
+    const row = buildPostImportRow ({
+      url: 'https://example.com/original',
+      importStatus: 'failed',
+      recoverable: true,
+      importErrors: { base: ['failed'] },
+      attributes: { title: 'old title', tags: 'old-tag', duration: '2' },
+      provenance: { title: 'automatic', tags: 'automatic', url: 'manual' },
+      tagSources: { automatic: 'old-tag', manual: '' } })
+
+    const nextRow = buildNextEditedRow (
+        row,
+        {
+          url: 'https://example.com/edited',
+          title: 'edited title',
+          thumbnailBase: '',
+          originalCreatedFrom: '',
+          originalCreatedBefore: '',
+          duration: '2.5',
+          tags: 'edited-tag',
+          parentPostIds: '' },
+        true)
+
+    expect (nextRow.importStatus).toBe ('pending')
+    expect (nextRow.importErrors).toBeUndefined ()
+    expect (nextRow.url).toBe ('https://example.com/edited')
+    expect (nextRow.attributes.title).toBe ('edited title')
+    expect (nextRow.attributes.duration).toBe ('2.5')
+    expect (nextRow.attributes.tags).toBe ('edited-tag')
+    expect (nextRow.provenance.title).toBe ('manual')
+    expect (nextRow.provenance.url).toBe ('manual')
+    expect (nextRow.tagSources?.manual).toBe ('edited-tag')
+  })
 })

frontend/src/lib/postImportRows.ts

@@ -1,4 +1,5 @@
-import type { PostImportResultRow,
+import type { PostImportEditableDraft,
+	      PostImportResultRow,
 	      PostImportRow } from '@/lib/postImportTypes'
 
 const hasSkipReason = (row: PostImportRow): boolean =>
@@ -7,6 +8,13 @@ const hasSkipReason = (row: PostImportRow): boolean =>
 const hasValidationErrors = (row: PostImportRow): boolean =>
     Object.keys (row.validationErrors ?? { }).length > 0
 
+const isRecoverableRow = (row: PostImportRow): boolean =>
+    row.recoverable === true
+
+const isRepairableImportStatus = (row: PostImportRow): boolean =>
+    isRecoverableRow (row)
+    && (row.importStatus === 'failed' || row.importStatus === 'pending')
+
 const buildResetSnapshot = (row: PostImportRow) => ({
     url: row.url,
     attributes: { ...row.attributes },
@@ -22,15 +30,15 @@ const buildResetSnapshot = (row: PostImportRow) => ({
 
 export const processableImportRows = (rows: PostImportRow[]): PostImportRow[] =>
     rows.filter (row => {
-	if (row.importStatus === 'created')
-	  return false
-	if (row.importStatus === 'skipped')
-	  return false
-	if (row.importStatus === 'failed')
-	  return false
-	if (hasValidationErrors (row))
-	  return false
-	return row.importStatus == null || row.importStatus === 'pending'
+      if (row.importStatus === 'created')
+        return false
+      if (row.importStatus === 'skipped')
+        return false
+      if (row.importStatus === 'failed')
+        return false
+      if (hasValidationErrors (row))
+        return false
+      return row.importStatus == null || row.importStatus === 'pending'
     })
 
 export const creatableImportRows = (rows: PostImportRow[]): PostImportRow[] =>
@@ -40,31 +48,151 @@ export const creatableImportRows = (rows: PostImportRow[]): PostImportRow[] =>
 export const reviewSummaryCounts = (rows: PostImportRow[]) => ({
     total: rows.length,
     submittable: rows.filter (row =>
-	creatableImportRows ([row]).length > 0
-	&& !(hasValidationErrors (row))).length,
+        creatableImportRows ([row]).length > 0
+        && !(hasValidationErrors (row))).length,
     skipPlanned: rows.filter (row =>
-	processableImportRows ([row]).length > 0
-	&& hasSkipReason (row)).length })
+        processableImportRows ([row]).length > 0
+        && hasSkipReason (row)).length })
 
 
 export const resultSummaryCounts = (rows: PostImportRow[]) =>
     rows.reduce (
-	(counts, row) => {
-	    if (row.importStatus === 'created')
-	      {
-		++counts.created
-		return counts
-	      }
-	    if (row.importStatus === 'skipped')
-	      {
-		++counts.skipped
-		return counts
-	      }
-	    if (row.importStatus === 'failed')
-	      ++counts.failed
-	    return counts
-	},
-	{ created: 0, skipped: 0, failed: 0 })
+        (counts, row) => {
+          if (row.importStatus === 'created')
+            {
+              ++counts.created
+              return counts
+            }
+          if (row.importStatus === 'skipped')
+            {
+              ++counts.skipped
+              return counts
+            }
+          if (row.importStatus === 'failed'
+              || (row.recoverable === true && row.importStatus === 'pending'))
+            ++counts.failed
+          return counts
+        },
+        { created: 0, skipped: 0, failed: 0 })
+
+
+export const resultRepairMode = (
+    rows: PostImportRow[],
+): 'all' | 'failed' =>
+    rows.some (row => hasValidationErrors (row) || isRepairableImportStatus (row))
+    ? 'failed'
+    : 'all'
+
+
+export const canEditReviewRow = (row: PostImportRow): boolean =>
+    !(row.importStatus === 'created'
+      || row.importStatus === 'skipped'
+      || (row.importStatus === 'failed' && row.recoverable !== true))
+
+
+export const canEditResultRow = (row: PostImportRow): boolean =>
+    row.recoverable === true
+    && (row.importStatus === 'failed'
+        || (row.importStatus === 'pending' && hasValidationErrors (row)))
+
+
+export const canRetryResultRow = (row: PostImportRow): boolean =>
+    row.recoverable === true
+    && (row.importStatus === 'failed'
+        || (row.importStatus === 'pending' && !(hasValidationErrors (row))))
+
+
+export const resultRowMessages = (row: PostImportRow): string[] =>
+    [...new Set ([
+        ...Object.values (row.validationErrors ?? { }).flat (),
+        ...Object.values (row.importErrors ?? { }).flat ()])]
+
+
+export const resultRowWarnings = (row: PostImportRow): string[] =>
+    [...new Set ([
+        ...Object.values (row.fieldWarnings ?? { }).flat (),
+        ...row.baseWarnings])]
+
+export const buildNextEditedRow = (
+    editingRow:  PostImportRow,
+    draft:       PostImportEditableDraft,
+    urlChanged:  boolean,
+): PostImportRow => {
+    const nextProvenance = { ...editingRow.provenance }
+    const nextAttributes = { ...editingRow.attributes }
+    const nextTagSources = {
+	automatic: editingRow.tagSources?.automatic ?? '',
+	manual: editingRow.tagSources?.manual ?? '' }
+    const draftFields = [
+	['title', draft.title],
+	['thumbnailBase', draft.thumbnailBase],
+	['originalCreatedFrom', draft.originalCreatedFrom],
+	['originalCreatedBefore', draft.originalCreatedBefore],
+	['duration', draft.duration],
+	['parentPostIds', draft.parentPostIds]] as const
+    draftFields.forEach (([field, value]) => {
+	nextAttributes[field] = value
+	nextProvenance[field] =
+	    value !== String (editingRow.attributes[field] ?? '')
+	    ? 'manual'
+	    : (editingRow.provenance[field] ?? 'automatic')
+    })
+    nextAttributes.tags = draft.tags
+    if (draft.tags !== String (editingRow.attributes.tags ?? ''))
+      {
+	nextProvenance.tags = 'manual'
+	nextTagSources.manual = draft.tags
+      }
+    else
+      {
+	nextProvenance.tags = editingRow.provenance.tags ?? 'automatic'
+	nextTagSources.manual = editingRow.tagSources?.manual ?? ''
+      }
+
+    return {
+	...editingRow,
+	url: draft.url,
+	attributes: nextAttributes,
+	provenance: {
+	    ...nextProvenance,
+	    url: urlChanged ? 'manual' : (editingRow.provenance.url ?? 'manual') },
+	tagSources: nextTagSources,
+	importStatus: editingRow.importStatus === 'created' ? 'created' : 'pending',
+	importErrors: undefined }
+}
+
+
+export const hasExactSourceRows = (
+    expected: number[],
+    actual:   Array<{ sourceRow: number }>,
+): boolean => {
+    if (expected.length !== actual.length)
+      return false
+
+    const expectedSorted = [...expected].sort ((a, b) => a - b)
+    const actualSorted = actual.map (row => row.sourceRow).sort ((a, b) => a - b)
+    return expectedSorted.every ((value, index) => value === actualSorted[index])
+}
+
+
+export const replaceImportRow = (
+    rows:      PostImportRow[],
+    nextRow:   PostImportRow,
+): PostImportRow[] =>
+    rows.map (row => row.sourceRow === nextRow.sourceRow ? nextRow : row)
+
+
+export const mergeValidatedImportRow = (
+    rows:      PostImportRow[],
+    validated: PostImportRow,
+): PostImportRow[] => {
+    const current = rows.find (row => row.sourceRow === validated.sourceRow)
+    if (current == null)
+      return rows
+
+    const [merged] = mergeValidatedImportRows ([current], [validated])
+    return merged == null ? rows : replaceImportRow (rows, merged)
+}
 
 
 export const mergeValidatedImportRows = (
@@ -73,46 +201,46 @@ export const mergeValidatedImportRows = (
 ): PostImportRow[] => {
     const validatedMap = new Map (validated.map (row => [row.sourceRow, row]))
     return current.map (previous => {
-	if (
-	    previous.importStatus === 'created'
-	    || previous.importStatus === 'skipped'
-	    || previous.importStatus === 'failed')
-	  return previous
+      if (
+          previous.importStatus === 'created'
+          || previous.importStatus === 'skipped'
+          || previous.importStatus === 'failed')
+        return previous
 
-	const row = validatedMap.get (previous.sourceRow)
-	if (row == null)
-	  return previous
+      const row = validatedMap.get (previous.sourceRow)
+      if (row == null)
+        return previous
 
-	const fieldWarnings =
-	    Object.keys (row.fieldWarnings).length > 0 || row.metadataUrl !== previous.metadataUrl
-	    ? { ...row.fieldWarnings }
-	    : { ...previous.fieldWarnings }
-	for (const [field, origin] of Object.entries (row.provenance))
-	  {
-	    if (origin === 'manual')
-	      delete fieldWarnings[field]
-	  }
+      const fieldWarnings =
+          Object.keys (row.fieldWarnings).length > 0 || row.metadataUrl !== previous.metadataUrl
+          ? { ...row.fieldWarnings }
+          : { ...previous.fieldWarnings }
+      for (const [field, origin] of Object.entries (row.provenance))
+        {
+          if (origin === 'manual')
+            delete fieldWarnings[field]
+        }
 
-	return {
-	    ...previous,
-	    url: row.url,
-	    attributes: row.attributes,
-	    provenance: row.provenance,
-	    tagSources: row.tagSources,
-	    skipReason: row.skipReason,
-	    existingPostId: row.existingPostId,
-	    fieldWarnings,
-	    baseWarnings:
-		row.baseWarnings.length > 0 || row.metadataUrl !== previous.metadataUrl
-		? row.baseWarnings
-		: previous.baseWarnings,
-	    validationErrors: row.validationErrors,
-	    status: row.status,
-	    metadataUrl: row.metadataUrl,
-	    resetSnapshot:
-		row.metadataUrl !== previous.metadataUrl
-		? buildResetSnapshot (row)
-		: previous.resetSnapshot }
+      return {
+          ...previous,
+          url: row.url,
+          attributes: row.attributes,
+          provenance: row.provenance,
+          tagSources: row.tagSources,
+          skipReason: row.skipReason,
+          existingPostId: row.existingPostId,
+          fieldWarnings,
+          baseWarnings:
+              row.baseWarnings.length > 0 || row.metadataUrl !== previous.metadataUrl
+              ? row.baseWarnings
+              : previous.baseWarnings,
+          validationErrors: row.validationErrors,
+          status: row.status,
+          metadataUrl: row.metadataUrl,
+          resetSnapshot:
+              row.metadataUrl !== previous.metadataUrl
+              ? buildResetSnapshot (row)
+              : previous.resetSnapshot }
     })
 }
 
@@ -123,37 +251,46 @@ export const mergeImportResults = (
 ): PostImportRow[] => {
     const resultMap = new Map (results.map (row => [row.sourceRow, row]))
     return rows.map (row => {
-	const result = resultMap.get (row.sourceRow)
-	if (result == null)
-	  return row
+      const result = resultMap.get (row.sourceRow)
+      if (result == null)
+        return row
 
-	switch (result.status)
-	  {
-	  case 'created':
-	    return {
-		...row,
-		importStatus: 'created',
-		skipReason: undefined,
-		createdPostId: result.post.id,
-		existingPostId: undefined,
-		importErrors: result.errors }
-	  case 'skipped':
-	    return {
-		...row,
-		importStatus: 'skipped',
-		skipReason: 'existing',
-		createdPostId: undefined,
-		existingPostId: result.existingPostId,
-		importErrors: result.errors }
-	  case 'failed':
-	    return {
-		...row,
-		importStatus: 'failed',
-		skipReason: undefined,
-		createdPostId: undefined,
-		existingPostId: undefined,
-		importErrors: result.errors }
-	  }
+      switch (result.status)
+        {
+        case 'created':
+          return {
+              ...row,
+              importStatus: 'created',
+              recoverable: undefined,
+              skipReason: undefined,
+              createdPostId: result.post.id,
+              existingPostId: undefined,
+              fieldWarnings: result.fieldWarnings ?? row.fieldWarnings,
+              baseWarnings: result.baseWarnings ?? row.baseWarnings,
+              importErrors: result.errors }
+        case 'skipped':
+          return {
+              ...row,
+              importStatus: 'skipped',
+              recoverable: undefined,
+              skipReason: 'existing',
+              createdPostId: undefined,
+              existingPostId: result.existingPostId,
+              fieldWarnings: result.fieldWarnings ?? row.fieldWarnings,
+              baseWarnings: result.baseWarnings ?? row.baseWarnings,
+              importErrors: result.errors }
+        case 'failed':
+          return {
+              ...row,
+              importStatus: 'failed',
+              recoverable: result.recoverable === true ? true : undefined,
+              skipReason: undefined,
+              createdPostId: undefined,
+              existingPostId: undefined,
+              fieldWarnings: result.fieldWarnings ?? row.fieldWarnings,
+              baseWarnings: result.baseWarnings ?? row.baseWarnings,
+              importErrors: result.errors }
+        }
     })
 }
 
@@ -163,11 +300,13 @@ export const retryImportRow = (
     sourceRow: number,
 ): PostImportRow[] =>
     rows.map (row =>
-	row.sourceRow === sourceRow && row.importStatus === 'failed'
-	? { ...row, importStatus: 'pending', importErrors: undefined }
-	: row)
+        row.sourceRow === sourceRow
+        && row.importStatus === 'failed'
+        && row.recoverable === true
+        ? { ...row, importStatus: 'pending', importErrors: undefined }
+        : row)
 
 export const initialisePreviewRows = (rows: PostImportRow[]): PostImportRow[] =>
     rows.map (row => ({
-	...row,
-	resetSnapshot: buildResetSnapshot (row) }))
+        ...row,
+        resetSnapshot: buildResetSnapshot (row) }))

frontend/src/lib/postImportSourceValidation.ts

@@ -19,30 +19,30 @@ const normaliseImportUrl = (value: string): string | null => {
 
     try
     {
-	const url = new URL (trimmed)
-	if (!(url.protocol === 'http:' || url.protocol === 'https:'))
-	  return null
-	if (!(url.host))
-	  return null
+      const url = new URL (trimmed)
+      if (!(url.protocol === 'http:' || url.protocol === 'https:'))
+        return null
+      if (!(url.host))
+        return null
 
-	url.hostname = url.hostname.toLowerCase ()
-	if (url.pathname.endsWith ('/'))
-	  url.pathname = url.pathname.replace (/\/+$/, '')
-	return url.toString ()
+      url.hostname = url.hostname.toLowerCase ()
+      if (url.pathname.endsWith ('/'))
+        url.pathname = url.pathname.replace (/\/+$/, '')
+      return url.toString ()
     }
     catch
     {
-	return null
+      return null
     }
 }
 
 
 export const countImportSourceLines = (source: string): number =>
     source
-	.split (/\r\n|\n|\r/)
-	.map (_1 => _1.trim ())
-	.filter (_1 => _1 !== '')
-	.length
+        .split (/\r\n|\n|\r/)
+        .map (line => line.trim ())
+        .filter (line => line !== '')
+        .length
 
 
 export const validateImportSource = (
@@ -54,56 +54,56 @@ export const validateImportSource = (
     let count = 0
 
     lines.forEach ((rawLine, index) => {
-	const value = rawLine.trim ()
-	if (!(value))
-	  return
+      const value = rawLine.trim ()
+      if (!(value))
+        return
 
-	++count
-	const sourceRow = index + 1
-	const displayUrl = truncateUrl (value)
-	const normalised = normaliseImportUrl (value)
-	if (count > MAX_ROWS)
-	  {
-	    issues.push ({
-		sourceRow,
-		message: `取込件数は ${ MAX_ROWS } 件までです．`,
-		url: displayUrl })
-	    return
-	  }
-	if (!(value.startsWith ('http://') || value.startsWith ('https://')))
-	  {
-	    issues.push ({
-		sourceRow,
-		message: 'HTTP または HTTPS の URL ではありません．',
-		url: displayUrl })
-	    return
-	  }
-	if (bytesize (value) > MAX_URL_BYTES)
-	  {
-	    issues.push ({
-		sourceRow,
-		message: 'URL が長すぎます．',
-		url: displayUrl })
-	    return
-	  }
-	if (normalised == null)
-	  {
-	    issues.push ({
-		sourceRow,
-		message: 'URL の形式が不正です．',
-		url: displayUrl })
-	    return
-	  }
-	const duplicateRow = seen.get (normalised)
-	if (duplicateRow != null)
-	  {
-	    issues.push ({
-		sourceRow,
-		message: `${ duplicateRow } 行目と同じ URL です．`,
-		url: displayUrl })
-	    return
-	  }
-	seen.set (normalised, sourceRow)
+      ++count
+      const sourceRow = index + 1
+      const displayUrl = truncateUrl (value)
+      const normalised = normaliseImportUrl (value)
+      if (count > MAX_ROWS)
+        {
+          issues.push ({
+              sourceRow,
+              message: `取込件数は ${ MAX_ROWS } 件までです．`,
+              url: displayUrl })
+          return
+        }
+      if (!(value.startsWith ('http://') || value.startsWith ('https://')))
+        {
+          issues.push ({
+              sourceRow,
+              message: 'HTTP または HTTPS の URL ではありません．',
+              url: displayUrl })
+          return
+        }
+      if (bytesize (value) > MAX_URL_BYTES)
+        {
+          issues.push ({
+              sourceRow,
+              message: 'URL が長すぎます．',
+              url: displayUrl })
+          return
+        }
+      if (normalised == null)
+        {
+          issues.push ({
+              sourceRow,
+              message: 'URL の形式が不正です．',
+              url: displayUrl })
+          return
+        }
+      const duplicateRow = seen.get (normalised)
+      if (duplicateRow != null)
+        {
+          issues.push ({
+              sourceRow,
+              message: `${ duplicateRow } 行目と同じ URL です．`,
+              url: displayUrl })
+          return
+        }
+      seen.set (normalised, sourceRow)
     })
 
     return issues

frontend/src/lib/postImportStorage.test.ts

@@ -16,18 +16,27 @@ describe ('post import storage', () => {
 
   it ('round-trips a valid session and source draft', () => {
     const row = buildPostImportRow ({
+      attributes: { duration: '2.5' },
+      recoverable: true,
+      importStatus: 'pending',
+      validationErrors: { title: ['invalid'] } })
+    const skipped = buildPostImportRow ({
       importStatus: 'skipped',
       skipReason: 'existing',
       existingPostId: 10 })
 
     expect (savePostImportSession ('session', {
-      source: row.url,
-      rows: [row],
+      source: skipped.url,
+      rows: [row, skipped],
       repairMode: 'all' })).toBe (true)
     expect (loadPostImportSession ('session')).toMatchObject ({
       version: 2,
-      source: row.url,
+      source: skipped.url,
       rows: [{
+	attributes: { duration: '2.5' },
+	recoverable: true,
+	importStatus: 'pending' },
+	      {
 	importStatus: 'skipped',
 	skipReason: 'existing',
 	existingPostId: 10 }] })
@@ -49,7 +58,10 @@ describe ('post import storage', () => {
       { ...session.rows[0], skipReason: 'existing', existingPostId: undefined },
       { ...session.rows[0], existingPostId: 2, skipReason: undefined },
       { ...session.rows[0], importStatus: 'created', createdPostId: undefined },
-      { ...session.rows[0], importStatus: 'failed', createdPostId: 3 }]
+      { ...session.rows[0], importStatus: 'failed', createdPostId: 3 },
+      { ...session.rows[0], importStatus: 'created', recoverable: true },
+      { ...session.rows[0], importStatus: 'skipped', recoverable: true },
+      { ...session.rows[0], recoverable: true }]
 
     for (const [index, row] of invalidRows.entries ())
       {

frontend/src/lib/postImportStorage.ts

@@ -40,12 +40,12 @@ const readStorage = (
 
     try
     {
-	return sessionStorage.getItem (key)
+      return sessionStorage.getItem (key)
     }
     catch
     {
-	onError?.('保存済みデータを読み込めませんでした．')
-	return null
+      onError?.('保存済みデータを読み込めませんでした．')
+      return null
     }
 }
 
@@ -60,13 +60,13 @@ const writeStorage = (
 
     try
     {
-	sessionStorage.setItem (key, value)
-	return true
+      sessionStorage.setItem (key, value)
+      return true
     }
     catch
     {
-	onError?.('ブラウザへ保存できませんでした．')
-	return false
+      onError?.('ブラウザへ保存できませんでした．')
+      return false
     }
 }
 
@@ -80,11 +80,11 @@ const removeStorage = (
 
     try
     {
-	sessionStorage.removeItem (key)
+      sessionStorage.removeItem (key)
     }
     catch
     {
-	onError?.('保存済みデータを削除できませんでした．')
+      onError?.('保存済みデータを削除できませんでした．')
     }
 }
 
@@ -96,9 +96,9 @@ const ensureStringListRecord = (value: unknown): Record<string, string[]> | null
     const result: Record<string, string[]> = { }
     for (const [key, entry] of Object.entries (value))
       {
-	if (!(Array.isArray (entry)) || !(entry.every (_1 => typeof _1 === 'string')))
-	  return null
-	result[key] = entry
+        if (!(Array.isArray (entry)) || !(entry.every (item => typeof item === 'string')))
+          return null
+        result[key] = entry
       }
     return result
 }
@@ -149,7 +149,7 @@ const sanitiseResetSnapshot = (value: unknown): PostImportResetSnapshot | null =
     if (!(hasOnlyKeys (value.attributes, ATTRIBUTE_KEYS)))
       return null
     if (!(Object.values (value.attributes).every (entry =>
-	typeof entry === 'string' || typeof entry === 'number')))
+        typeof entry === 'string' || typeof entry === 'number')))
       return null
     if (!(isPlainObject (value.provenance)))
       return null
@@ -161,7 +161,7 @@ const sanitiseResetSnapshot = (value: unknown): PostImportResetSnapshot | null =
       return null
     if (!(hasOnlyKeys (value.tagSources, TAG_SOURCE_KEYS)))
       return null
-    if (!(Object.values (value.tagSources).every (_1 => typeof _1 === 'string')))
+    if (!(Object.values (value.tagSources).every (entry => typeof entry === 'string')))
       return null
     const fieldWarnings = ensureStringListRecord (value.fieldWarnings)
     if (fieldWarnings == null)
@@ -169,19 +169,19 @@ const sanitiseResetSnapshot = (value: unknown): PostImportResetSnapshot | null =
     if (!(hasOnlyKeys (fieldWarnings, WARNING_KEYS)))
       return null
     if (!(Array.isArray (value.baseWarnings))
-	|| !(value.baseWarnings.every (_1 => typeof _1 === 'string')))
+        || !(value.baseWarnings.every (warning => typeof warning === 'string')))
       return null
     if (value.metadataUrl != null && typeof value.metadataUrl !== 'string')
       return null
 
     return {
-	url: value.url,
-	attributes: value.attributes as Record<string, string | number>,
-	provenance: value.provenance as Record<string, PostImportOrigin>,
-	tagSources: value.tagSources as Record<PostImportOrigin, string>,
-	fieldWarnings,
-	baseWarnings: value.baseWarnings,
-	metadataUrl: value.metadataUrl as string | undefined }
+        url: value.url,
+        attributes: value.attributes as Record<string, string | number>,
+        provenance: value.provenance as Record<string, PostImportOrigin>,
+        tagSources: value.tagSources as Record<PostImportOrigin, string>,
+        fieldWarnings,
+        baseWarnings: value.baseWarnings,
+        metadataUrl: value.metadataUrl as string | undefined }
 }
 
 
@@ -202,6 +202,8 @@ const sanitiseRow = (value: unknown): PostImportRow | null => {
       return null
     if (value.skipReason != null && !(isValidSkipReason (value.skipReason)))
       return null
+    if (value.recoverable != null && value.recoverable !== true)
+      return null
     if (value.skipReason === 'existing' && !(isPositiveInteger (value.existingPostId)))
       return null
     if (value.skipReason !== 'existing' && value.existingPostId != null)
@@ -210,6 +212,13 @@ const sanitiseRow = (value: unknown): PostImportRow | null => {
       return null
     if (value.importStatus !== 'created' && value.createdPostId != null)
       return null
+    if (value.recoverable === true
+        && value.importStatus !== 'failed'
+        && value.importStatus !== 'pending')
+      return null
+    if ((value.importStatus === 'created' || value.importStatus === 'skipped')
+        && value.recoverable != null)
+      return null
 
     const validationErrors = ensureStringListRecord (value.validationErrors)
     const fieldWarnings = ensureStringListRecord (value.fieldWarnings)
@@ -220,20 +229,20 @@ const sanitiseRow = (value: unknown): PostImportRow | null => {
       return null
 
     const importErrors =
-	value.importErrors == null
-	? undefined
-	: ensureStringListRecord (value.importErrors)
+        value.importErrors == null
+        ? undefined
+        : ensureStringListRecord (value.importErrors)
     if (importErrors === null)
       return null
     if (!(Array.isArray (value.baseWarnings))
-	|| !(value.baseWarnings.every (_1 => typeof _1 === 'string')))
+        || !(value.baseWarnings.every (warning => typeof warning === 'string')))
       return null
 
     const provenanceEntries = Object.entries (value.provenance)
     if (!(hasOnlyKeys (value.attributes, ATTRIBUTE_KEYS)))
       return null
     if (!(Object.values (value.attributes).every (entry =>
-	typeof entry === 'string' || typeof entry === 'number')))
+        typeof entry === 'string' || typeof entry === 'number')))
       return null
     if (!(hasOnlyKeys (value.provenance, PROVENANCE_KEYS)))
       return null
@@ -242,33 +251,34 @@ const sanitiseRow = (value: unknown): PostImportRow | null => {
 
     if (value.tagSources != null)
       {
-	if (!(isPlainObject (value.tagSources)))
-	  return null
-	if (!(hasOnlyKeys (value.tagSources, TAG_SOURCE_KEYS)))
-	  return null
-	if (!(Object.values (value.tagSources).every (_1 => typeof _1 === 'string')))
-	  return null
+        if (!(isPlainObject (value.tagSources)))
+          return null
+        if (!(hasOnlyKeys (value.tagSources, TAG_SOURCE_KEYS)))
+          return null
+        if (!(Object.values (value.tagSources).every (entry => typeof entry === 'string')))
+          return null
       }
 
     return {
-	sourceRow: Number (value.sourceRow),
-	url: value.url,
-	attributes: value.attributes as Record<string, string | number>,
-	fieldWarnings,
-	baseWarnings: value.baseWarnings,
-	validationErrors,
-	importErrors,
-	provenance: value.provenance as Record<string, PostImportOrigin>,
-	tagSources: value.tagSources as Record<PostImportOrigin, string> | undefined,
-	status: value.status,
-	skipReason: value.skipReason ?? undefined,
-	existingPostId:
-	    isPositiveInteger (value.existingPostId) ? Number (value.existingPostId) : undefined,
-	metadataUrl: typeof value.metadataUrl === 'string' ? value.metadataUrl : undefined,
-	resetSnapshot,
-	createdPostId:
-	    isPositiveInteger (value.createdPostId) ? Number (value.createdPostId) : undefined,
-	importStatus: value.importStatus ?? undefined }
+        sourceRow: Number (value.sourceRow),
+        url: value.url,
+        attributes: value.attributes as Record<string, string | number>,
+        fieldWarnings,
+        baseWarnings: value.baseWarnings,
+        validationErrors,
+        importErrors,
+        provenance: value.provenance as Record<string, PostImportOrigin>,
+        tagSources: value.tagSources as Record<PostImportOrigin, string> | undefined,
+        status: value.status,
+        skipReason: value.skipReason ?? undefined,
+        existingPostId:
+            isPositiveInteger (value.existingPostId) ? Number (value.existingPostId) : undefined,
+        metadataUrl: typeof value.metadataUrl === 'string' ? value.metadataUrl : undefined,
+        resetSnapshot,
+        createdPostId:
+            isPositiveInteger (value.createdPostId) ? Number (value.createdPostId) : undefined,
+        importStatus: value.importStatus ?? undefined,
+        recoverable: value.recoverable === true ? true : undefined }
 }
 
 
@@ -292,34 +302,34 @@ export const cleanupExpiredPostImportSessions = (
 
     try
     {
-	for (let i = 0; i < sessionStorage.length; ++i)
-	  {
-	    const key = sessionStorage.key (i)
-	    if (key == null || !(key.startsWith (SESSION_PREFIX)))
-	      continue
+      for (let i = 0; i < sessionStorage.length; ++i)
+        {
+          const key = sessionStorage.key (i)
+          if (key == null || !(key.startsWith (SESSION_PREFIX)))
+            continue
 
-	    const raw = sessionStorage.getItem (key)
-	    if (raw == null)
-	      continue
-	    try
-	    {
-		const value = JSON.parse (raw) as { savedAt?: string }
-		if (typeof value.savedAt !== 'string' || isExpiredSession (value.savedAt))
-		  {
-		    sessionStorage.removeItem (key)
-		    --i
-		  }
-	    }
-	    catch
-	    {
-		sessionStorage.removeItem (key)
-		--i
-	    }
-	  }
+          const raw = sessionStorage.getItem (key)
+          if (raw == null)
+            continue
+          try
+          {
+            const value = JSON.parse (raw) as { savedAt?: string }
+            if (typeof value.savedAt !== 'string' || isExpiredSession (value.savedAt))
+              {
+                sessionStorage.removeItem (key)
+                --i
+              }
+          }
+          catch
+          {
+            sessionStorage.removeItem (key)
+            --i
+          }
+        }
     }
     catch
     {
-	onError?.('保存済みデータを整理できませんでした．')
+      onError?.('保存済みデータを整理できませんでした．')
     }
 }
 
@@ -333,12 +343,12 @@ export const loadPostImportSourceDraft = (
 
     try
     {
-	const value = JSON.parse (raw) as { source?: string }
-	return { source: typeof value.source === 'string' ? value.source : '' }
+      const value = JSON.parse (raw) as { source?: string }
+      return { source: typeof value.source === 'string' ? value.source : '' }
     }
     catch
     {
-	return { source: '' }
+      return { source: '' }
     }
 }
 
@@ -363,12 +373,12 @@ export const savePostImportSession = (
     onError?:  StorageErrorHandler,
 ): boolean =>
     writeStorage (
-	sessionKey (sessionId),
-	JSON.stringify ({
-	    ...session,
-	    version: SESSION_VERSION,
-	    savedAt: new Date ().toISOString () }),
-	onError)
+        sessionKey (sessionId),
+        JSON.stringify ({
+            ...session,
+            version: SESSION_VERSION,
+            savedAt: new Date ().toISOString () }),
+        onError)
 
 
 export const loadPostImportSession = (
@@ -381,28 +391,28 @@ export const loadPostImportSession = (
 
     try
     {
-	const value = JSON.parse (raw) as Partial<PostImportSession>
-	if (value.version !== SESSION_VERSION || !(Array.isArray (value.rows)))
-	  return null
-	if (typeof value.savedAt !== 'string' || isExpiredSession (value.savedAt))
-	  {
-	    removeStorage (sessionKey (sessionId), onError)
-	    return null
-	  }
+      const value = JSON.parse (raw) as Partial<PostImportSession>
+      if (value.version !== SESSION_VERSION || !(Array.isArray (value.rows)))
+        return null
+      if (typeof value.savedAt !== 'string' || isExpiredSession (value.savedAt))
+        {
+          removeStorage (sessionKey (sessionId), onError)
+          return null
+        }
 
-	const rows = value.rows.map (sanitiseRow)
-	if (rows.some (_1 => _1 == null))
-	  return null
+      const rows = value.rows.map (sanitiseRow)
+      if (rows.some (row => row == null))
+        return null
 
-	return {
-	    version: SESSION_VERSION,
-	    savedAt: value.savedAt,
-	    source: typeof value.source === 'string' ? value.source : '',
-	    rows: rows as PostImportRow[],
-	    repairMode: value.repairMode === 'failed' ? 'failed' : 'all' }
+      return {
+          version: SESSION_VERSION,
+          savedAt: value.savedAt,
+          source: typeof value.source === 'string' ? value.source : '',
+          rows: rows as PostImportRow[],
+          repairMode: value.repairMode === 'failed' ? 'failed' : 'all' }
     }
     catch
     {
-	return null
+      return null
     }
 }

frontend/src/lib/postImportTypes.ts

@@ -34,22 +34,29 @@ export type PostImportRow = {
     metadataUrl?:      string
     resetSnapshot:     PostImportResetSnapshot
     createdPostId?:    number
-    importStatus?:     PostImportStatus }
+    importStatus?:     PostImportStatus
+    recoverable?:      boolean }
 
 export type PostImportResultRow =
     | {
 	sourceRow: number
 	status:    'created'
 	post:      { id: number }
+	fieldWarnings?: Record<string, string[]>
+	baseWarnings?:  string[]
 	errors?:   Record<string, string[]> }
     | {
 	sourceRow:      number
 	status:         'skipped'
 	existingPostId: number
+	fieldWarnings?: Record<string, string[]>
+	baseWarnings?:  string[]
 	errors?:        Record<string, string[]> }
     | {
 	sourceRow: number
 	status:    'failed'
+	fieldWarnings?: Record<string, string[]>
+	baseWarnings?:  string[]
 	errors?:   Record<string, string[]>
 	recoverable?: boolean }
 
@@ -65,4 +72,14 @@ export type PostImportSourceIssue = {
     message:   string
     url:       string }
 
+export type PostImportEditableDraft = {
+    url:                   string
+    title:                 string
+    thumbnailBase:         string
+    originalCreatedFrom:   string
+    originalCreatedBefore: string
+    duration:              string
+    tags:                  string
+    parentPostIds:         string }
+
 export type StorageErrorHandler = (message: string) => void

frontend/src/pages/posts/PostImportResultPage.test.tsx

@@ -1,82 +1,402 @@
-import { fireEvent, screen } from '@testing-library/react'
-import { Route, Routes, useLocation } from 'react-router-dom'
+import { act, fireEvent, render, screen, waitFor } from '@testing-library/react'
+import { HelmetProvider } from 'react-helmet-async'
+import { MemoryRouter, Route, Routes } from 'react-router-dom'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
-import { savePostImportSession } from '@/lib/postImportSession'
+import {
+  loadPostImportSession,
+  savePostImportSession,
+} from '@/lib/postImportSession'
 import PostImportResultPage from '@/pages/posts/PostImportResultPage'
 import { buildUser } from '@/test/factories'
 import { buildPostImportRow } from '@/test/postImportFactories'
-import { renderWithProviders } from '@/test/render'
+import { originalCreatedAtString } from '@/lib/utils'
 
-const api = vi.hoisted (() => ({ apiPost: vi.fn () }))
-const toastApi = vi.hoisted (() => ({ toast: vi.fn () }))
+import type { PostImportRow } from '@/lib/postImportSession'
+import type { DialogueFormAction, DialogueFormControls } from '@/lib/dialogues/useDialogue'
+
+const api = vi.hoisted (() => ({
+  apiGet: vi.fn (),
+  apiPost: vi.fn (),
+}))
+
+const toastApi = vi.hoisted (() => ({
+  toast: vi.fn (),
+}))
+
+const dialogue = vi.hoisted (() => ({
+  form: vi.fn (() => Promise.resolve ()),
+}))
 
-vi.mock ('@/lib/api', () => api)
 vi.mock ('@/components/ui/use-toast', () => toastApi)
-
-const ReviewLocation = () => {
-  const location = useLocation ()
-  return <div>{`review route ${ location.search }`}</div>
-}
-
-const renderPage = () => renderWithProviders (
-    <Routes>
-      <Route
-	  path="/posts/import/:sessionId/result"
-	  element={<PostImportResultPage user={buildUser ()}/>}/>
-      <Route path="/posts/import/:sessionId/review" element={<ReviewLocation/>}/>
-    </Routes>,
-    { route: '/posts/import/session/result' })
+vi.mock ('@/lib/api', () => api)
+vi.mock ('@/lib/dialogues/useDialogue', () => ({
+  default: () => dialogue,
+}))
 
 describe ('PostImportResultPage', () => {
   beforeEach (() => {
     sessionStorage.clear ()
     vi.clearAllMocks ()
+    globalThis.URL.createObjectURL = vi.fn (() => 'blob:preview')
+    globalThis.URL.revokeObjectURL = vi.fn ()
+    api.apiGet.mockResolvedValue (new Blob (['img'], { type: 'image/png' }))
   })
 
-  it ('shows exclusive result counts, post links, and failed-row actions', async () => {
-    const rows = [
-      buildPostImportRow ({ sourceRow: 1, importStatus: 'created', createdPostId: 11 }),
-      buildPostImportRow ({ sourceRow: 2, importStatus: 'skipped',
-	skipReason: 'existing', existingPostId: 22 }),
-      buildPostImportRow ({ sourceRow: 3, importStatus: 'failed',
-	importErrors: { base: ['登録中に失敗しました．'] } })]
-    savePostImportSession ('session', { source: '', rows, repairMode: 'all' })
+  it ('shows edit and retry only for recoverable failures and shows warnings', () => {
+    savePostImportSession ('result-session', {
+      source: '',
+      repairMode: 'failed',
+      rows: [
+        buildPostImportRow ({
+          sourceRow: 1,
+          attributes: { title: 'recoverable row' },
+          importStatus: 'failed',
+          recoverable: true,
+          importErrors: { base: ['recoverable failed'] } }),
+        buildPostImportRow ({
+          sourceRow: 2,
+          attributes: { title: 'hard failed row' },
+          importStatus: 'failed',
+          importErrors: { base: ['hard failed'] } }),
+        buildPostImportRow ({
+          sourceRow: 3,
+          attributes: {
+            title: 'created row',
+            originalCreatedFrom: '2024-01-01T00:00:00Z',
+            originalCreatedBefore: '2024-01-02T00:00:00Z' },
+          importStatus: 'created',
+          createdPostId: 3,
+          fieldWarnings: {
+            thumbnailBase: ['サムネール画像を取得できませんでした．'] } })] })
 
-    renderPage ()
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/result-session/result']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<PostImportResultPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
 
-    expect (await screen.findByText (
-	/登録成功\s*1件.*スキップ\s*1件.*失敗\s*1件/)).toBeInTheDocument ()
-    expect (screen.getAllByRole ('link', { name: '投稿を開く' })
-	.map (_1 => _1.getAttribute ('href'))).toEqual (['/posts/11', '/posts/22'])
-    expect (screen.getByText ('登録中に失敗しました．')).toBeInTheDocument ()
-    expect (screen.getByRole ('button', { name: '編輯' })).toBeInTheDocument ()
-    expect (screen.getByRole ('button', { name: '再試行' })).toBeInTheDocument ()
+    expect (screen.getAllByRole ('button', { name: '編輯' })).toHaveLength (1)
+    expect (screen.getAllByRole ('button', { name: '再試行' })).toHaveLength (1)
+    expect (screen.getByText ('サムネール画像を取得できませんでした．'))
+        .toBeInTheDocument ()
+    expect (screen.getByText (
+        originalCreatedAtString ('2024-01-01T00:00:00Z', '2024-01-02T00:00:00Z'),
+    )).toBeInTheDocument ()
   })
 
-  it ('returns a retry validation error to the review dialogue route', async () => {
-    const failed = buildPostImportRow ({
-      importStatus: 'failed',
-      importErrors: { base: ['old error'] } })
-    const invalid = buildPostImportRow ({
-      importStatus: 'pending',
-      status: 'error',
-      validationErrors: { title: ['タイトルを確認してください．'] } })
-    savePostImportSession ('session', {
-      source: failed.url,
-      rows: [failed],
-      repairMode: 'all' })
-    api.apiPost.mockResolvedValue ({ rows: [invalid] })
+  it ('shows hour-precision original-created ranges with the shared utility output', () => {
+    const from = '2024-01-01T12:00:00Z'
+    const before = '2024-01-01T13:00:00Z'
+    savePostImportSession ('result-hour-range', {
+      source: '',
+      repairMode: 'all',
+      rows: [buildPostImportRow ({
+        sourceRow: 1,
+        importStatus: 'created',
+        createdPostId: 1,
+        attributes: {
+          title: 'created row',
+          originalCreatedFrom: from,
+          originalCreatedBefore: before } })] })
 
-    renderPage ()
-    fireEvent.click (await screen.findByRole ('button', { name: '再試行' }))
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/result-hour-range/result']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<PostImportResultPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
 
-    expect (await screen.findByText ('review route ?edit=1')).toBeInTheDocument ()
-    expect (api.apiPost).toHaveBeenCalledTimes (1)
-    const saved = JSON.parse (
-	sessionStorage.getItem ('post-import-session:session') ?? '{}')
-    expect (saved.rows[0]).toMatchObject ({
-      importStatus: 'pending',
-      validationErrors: { title: ['タイトルを確認してください．'] } })
+    expect (screen.getByText (originalCreatedAtString (from, before))).toBeInTheDocument ()
+  })
+
+  it ('keeps recoverable pending rows actionable and hides actions for hard failures', () => {
+    savePostImportSession ('result-pending', {
+      source: '',
+      repairMode: 'failed',
+      rows: [
+        buildPostImportRow ({
+          sourceRow: 1,
+          importStatus: 'pending',
+          recoverable: true,
+          validationErrors: { title: ['invalid'] } }),
+        buildPostImportRow ({
+          sourceRow: 2,
+          importStatus: 'pending',
+          recoverable: true }),
+        buildPostImportRow ({
+          sourceRow: 3,
+          importStatus: 'failed',
+          importErrors: { base: ['hard failed'] } })] })
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/result-pending/result']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<PostImportResultPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    expect (screen.getAllByRole ('button', { name: '編輯' })).toHaveLength (1)
+    expect (screen.getAllByRole ('button', { name: '再試行' })).toHaveLength (1)
+    expect (screen.getByText ('invalid')).toBeInTheDocument ()
+    expect (screen.getByText ('hard failed')).toBeInTheDocument ()
+  })
+
+  it ('disables editing, retry, and navigation while retry is running', async () => {
+    let resolveValidation: ((value: { rows: PostImportRow[] }) => void) | null = null
+    savePostImportSession ('result-retry-busy', {
+      source: '',
+      repairMode: 'failed',
+      rows: [
+        buildPostImportRow ({
+          sourceRow: 1,
+          importStatus: 'failed',
+          recoverable: true,
+          importErrors: { base: ['failed'] } }),
+        buildPostImportRow ({
+          sourceRow: 2,
+          importStatus: 'failed',
+          recoverable: true,
+          importErrors: { base: ['failed'] } })] })
+    api.apiPost.mockImplementationOnce (() =>
+        new Promise<{ rows: PostImportRow[] }> (resolve => {
+          resolveValidation = resolve
+        }))
+    api.apiPost.mockResolvedValueOnce ({
+      created: 0,
+      skipped: 0,
+      failed: 0,
+      rows: [] })
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/result-retry-busy/result']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<PostImportResultPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getAllByRole ('button', { name: '再試行' })[0])
+
+    await waitFor (() => {
+      screen.getAllByRole ('button', { name: '編輯' }).forEach (button => {
+        expect (button).toBeDisabled ()
+      })
+      screen.getAllByRole ('button', { name: '再試行' }).forEach (button => {
+        expect (button).toBeDisabled ()
+      })
+      expect (screen.getByRole ('button', { name: '確認画面へ戻る' })).toBeDisabled ()
+      expect (screen.getByRole ('button', { name: '新しい URL リストを入力' })).toBeDisabled ()
+    })
+
+    resolveValidation?.({ rows: [buildPostImportRow ({ sourceRow: 1 })] })
+  })
+
+  it ('persists retry success to sessionStorage', async () => {
+    savePostImportSession ('result-retry-success', {
+      source: '',
+      repairMode: 'failed',
+      rows: [buildPostImportRow ({
+        sourceRow: 1,
+        importStatus: 'failed',
+        recoverable: true,
+        importErrors: { base: ['failed'] } })] })
+    api.apiPost
+        .mockResolvedValueOnce ({
+          rows: [buildPostImportRow ({
+            sourceRow: 1,
+            importStatus: 'pending',
+            recoverable: true })] })
+        .mockResolvedValueOnce ({
+          created: 1,
+          skipped: 0,
+          failed: 0,
+          rows: [{
+            sourceRow: 1,
+            status: 'created',
+            post: { id: 10 } }] })
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/result-retry-success/result']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<PostImportResultPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '再試行' }))
+
+    await waitFor (() => {
+      expect (loadPostImportSession ('result-retry-success')?.rows[0]?.importStatus)
+          .toBe ('created')
+    })
+  })
+
+  it ('keeps edited recoverable rows in session and retries with the edited values', async () => {
+    savePostImportSession ('result-edit-retry', {
+      source: '',
+      repairMode: 'failed',
+      rows: [buildPostImportRow ({
+        sourceRow: 1,
+        attributes: { title: 'old title' },
+        importStatus: 'failed',
+        recoverable: true,
+        importErrors: { base: ['failed'] } })] })
+    api.apiPost
+        .mockResolvedValueOnce ({
+          rows: [buildPostImportRow ({
+            sourceRow: 1,
+            attributes: { title: 'edited title' },
+            importStatus: 'pending',
+            recoverable: true })] })
+        .mockResolvedValueOnce ({
+          rows: [buildPostImportRow ({
+            sourceRow: 1,
+            attributes: { title: 'edited title' },
+            importStatus: 'pending',
+            recoverable: true })] })
+        .mockResolvedValueOnce ({
+          created: 1,
+          skipped: 0,
+          failed: 0,
+          rows: [{
+            sourceRow: 1,
+            status: 'created',
+            post: { id: 11 } }] })
+    dialogue.form.mockImplementationOnce (async options => {
+      let actions: DialogueFormAction[] = []
+      const controls: DialogueFormControls = {
+        close: vi.fn (),
+        confirm: vi.fn (),
+        setActions: next => {
+          actions = next
+        } }
+
+      render (options.body (controls))
+      await waitFor (() => expect (actions.length).toBe (2))
+      fireEvent.change (screen.getByDisplayValue ('old title'), {
+        target: { value: 'edited title' } })
+      await act (async () => {
+        await actions.find (action => action.label === '編輯内容を保存')?.onSelect ()
+      })
+    })
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/result-edit-retry/result']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<PostImportResultPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '編輯' }))
+
+    await waitFor (() => {
+      const saved = loadPostImportSession ('result-edit-retry')
+      expect (saved?.rows[0]?.attributes.title).toBe ('edited title')
+      expect (saved?.rows[0]?.importStatus).toBe ('pending')
+    })
+
+    fireEvent.click (screen.getByRole ('button', { name: '再試行' }))
+
+    await waitFor (() => {
+      expect (api.apiPost.mock.calls[2]?.[1]?.rows?.[0]?.attributes?.title)
+          .toBe ('edited title')
+    })
+  })
+
+  it ('persists restored failed state when retry fails', async () => {
+    savePostImportSession ('result-retry-failure', {
+      source: '',
+      repairMode: 'failed',
+      rows: [buildPostImportRow ({
+        sourceRow: 1,
+        importStatus: 'failed',
+        recoverable: true,
+        importErrors: { base: ['failed'] } })] })
+    api.apiPost.mockRejectedValueOnce (new Error ('network error'))
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/result-retry-failure/result']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<PostImportResultPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '再試行' }))
+
+    await waitFor (() => {
+      const saved = loadPostImportSession ('result-retry-failure')
+      expect (saved?.rows[0]?.importStatus).toBe ('failed')
+      expect (saved?.rows[0]?.recoverable).toBe (true)
+    })
+  })
+
+  it ('restores the failed row when the retry import response is incomplete', async () => {
+    savePostImportSession ('result-retry-missing-row', {
+      source: '',
+      repairMode: 'failed',
+      rows: [buildPostImportRow ({
+        sourceRow: 1,
+        importStatus: 'failed',
+        recoverable: true,
+        importErrors: { base: ['failed'] } })] })
+    api.apiPost
+        .mockResolvedValueOnce ({
+          rows: [buildPostImportRow ({
+            sourceRow: 1,
+            importStatus: 'pending',
+            recoverable: true })] })
+        .mockResolvedValueOnce ({
+          created: 1,
+          skipped: 0,
+          failed: 0,
+          rows: [] })
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/result-retry-missing-row/result']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<PostImportResultPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '再試行' }))
+
+    await waitFor (() => {
+      const saved = loadPostImportSession ('result-retry-missing-row')
+      expect (saved?.rows[0]?.importStatus).toBe ('failed')
+      expect (toastApi.toast).toHaveBeenCalledWith (
+          expect.objectContaining ({ title: '登録結果が不完全でした' }))
+    })
   })
 })

frontend/src/pages/posts/PostImportResultPage.tsx

@@ -1,48 +1,61 @@
-import { useEffect, useMemo, useState } from 'react'
+import { useEffect, useMemo, useRef, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useNavigate, useParams } from 'react-router-dom'
 
 import FieldError from '@/components/common/FieldError'
+import FieldWarning from '@/components/common/FieldWarning'
 import PageTitle from '@/components/common/PageTitle'
 import PrefetchLink from '@/components/PrefetchLink'
 import MainArea from '@/components/layout/MainArea'
+import PostImportRowForm from '@/components/posts/import/PostImportRowForm'
 import PostImportStatusBadge from '@/components/posts/import/PostImportStatusBadge'
 import { displayPostImportStatus } from '@/components/posts/import/postImportRowStatus'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
 import { apiPost } from '@/lib/api'
+import useDialogue from '@/lib/dialogues/useDialogue'
 import { canEditContent } from '@/lib/users'
 import { clearPostImportSourceDraft,
+	 buildNextEditedRow,
+	 canEditResultRow,
+	 canRetryResultRow,
+	 hasExactSourceRows,
 	 initialisePreviewRows,
 	 loadPostImportSession,
 	 mergeImportResults,
-	 mergeValidatedImportRows,
+	 mergeValidatedImportRow,
+	 replaceImportRow,
+	 resultRepairMode,
+	 resultRowMessages,
+	 resultRowWarnings,
 	 resultSummaryCounts,
 	 retryImportRow,
 	 savePostImportSession } from '@/lib/postImportSession'
+import { originalCreatedAtString } from '@/lib/utils'
 import Forbidden from '@/pages/Forbidden'
 
 import type { FC } from 'react'
 
+import type { PostImportRowDraft } from '@/components/posts/import/PostImportRowForm'
 import type { PostImportResultRow, PostImportRow } from '@/lib/postImportSession'
 import type { PostImportSession } from '@/lib/postImportSession'
 import type { User } from '@/types'
 
 type Props = { user: User | null }
 
-const rowMessages = (row: PostImportRow): string[] =>
-    Object.values (row.importErrors ?? { }).flat ()
-
 
 const PostImportResultPage: FC<Props> = ({ user }) => {
   const editable = canEditContent (user)
+  const dialogue = useDialogue ()
   const navigate = useNavigate ()
   const { sessionId } = useParams ()
 
   const [session, setSession] = useState<PostImportSession | null> (null)
   const [missing, setMissing] = useState (false)
   const [loadingRow, setLoadingRow] = useState<number | null> (null)
+  const [, setEditingRow] = useState<PostImportRow | null> (null)
+  const sessionRef = useRef<PostImportSession | null> (null)
 
   useEffect (() => {
     if (sessionId == null)
@@ -62,115 +75,341 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
 	toast ({ title: '取込状態を保存できませんでした', description: message }))
   }, [session, sessionId])
 
+  useEffect (() => {
+    sessionRef.current = session
+  }, [session])
+
   const counts = useMemo (
       () => resultSummaryCounts (session?.rows ?? []),
       [session])
+  const busy = loadingRow != null
+
+  const persistSession = (nextSession: PostImportSession) => {
+    if (sessionId == null)
+      return
+
+    savePostImportSession (sessionId, nextSession, message =>
+        toast ({ title: '取込状態を保存できませんでした', description: message }))
+  }
+
+  const saveDraft = async (
+      row: PostImportRow,
+      { draft, resetRequested }: {
+	  draft:            PostImportRowDraft
+	  resetRequested:   boolean },
+  ): Promise<{ saved: boolean
+	       row:   PostImportRow | null }> => {
+    const currentSession = sessionRef.current
+    if (currentSession == null)
+      return { saved: false, row: null }
+    if (!(canEditResultRow (row)))
+      return { saved: false, row: null }
+
+    const baseRow =
+	resetRequested
+	? { ...row,
+	    url: row.resetSnapshot.url,
+	    attributes: { ...row.resetSnapshot.attributes },
+	    provenance: { ...row.resetSnapshot.provenance },
+	    tagSources: { ...row.resetSnapshot.tagSources },
+	    fieldWarnings: Object.fromEntries (
+		Object.entries (row.resetSnapshot.fieldWarnings)
+		    .map (([key, values]) => [key, [...values]])),
+	    baseWarnings: [...row.resetSnapshot.baseWarnings],
+	    metadataUrl: row.resetSnapshot.metadataUrl }
+	: row
+    const urlChanged = draft.url !== baseRow.url
+    const nextRow = buildNextEditedRow (baseRow, draft, urlChanged)
+
+    const nextRows = currentSession.rows.map (row =>
+		row.sourceRow === baseRow.sourceRow
+		? nextRow
+		: row)
+    try
+    {
+      const validated = await apiPost<{ rows: PostImportRow[] }> ('/posts/import/validate', {
+	  rows:
+	      nextRows
+	      .filter (row => row.importStatus !== 'created')
+	      .map (row => ({ sourceRow: row.sourceRow,
+			      url: row.url,
+			      attributes: row.attributes,
+			      provenance: row.provenance,
+			      tagSources: row.tagSources,
+			      metadataUrl: row.metadataUrl })),
+	  changed_row: urlChanged ? baseRow.sourceRow : -1 })
+      const validatedRows = initialisePreviewRows (validated.rows)
+      const target = validatedRows.find (
+          validatedRow => validatedRow.sourceRow === baseRow.sourceRow)
+      const latestSession = sessionRef.current
+      if (latestSession == null)
+        return { saved: false, row: null }
+      if (target == null)
+        {
+          const restoredRows = replaceImportRow (latestSession.rows, row)
+          const restoredSession = {
+              ...latestSession,
+              rows: restoredRows,
+              repairMode: resultRepairMode (restoredRows) }
+          sessionRef.current = restoredSession
+          setSession (restoredSession)
+          toast ({ title: '行の再検証結果が不完全でした' })
+          return { saved: false, row: null }
+        }
+      const editedRows = replaceImportRow (latestSession.rows, nextRow)
+      const rows = mergeValidatedImportRow (editedRows, target)
+      const nextSession = {
+          ...latestSession,
+          rows,
+          repairMode: resultRepairMode (rows) }
+      sessionRef.current = nextSession
+      setSession (nextSession)
+      persistSession (nextSession)
+      const mergedTarget =
+          rows.find (mergedRow => mergedRow.sourceRow === baseRow.sourceRow)
+          ?? target
+      if (Object.keys (mergedTarget.validationErrors).length > 0)
+        return { saved: false, row: mergedTarget }
+      return { saved: true, row: null }
+    }
+    catch
+    {
+      toast ({ title: '行の再検証に失敗しました' })
+      return { saved: false, row: null }
+    }
+  }
+
+  const openEditingDialogue = async (row: PostImportRow) => {
+    const saveRowDraft = (
+	{ draft, resetRequested }: {
+	    draft:          PostImportRowDraft
+	    resetRequested: boolean },
+    ) =>
+	saveDraft (row, { draft, resetRequested })
+
+    await dialogue.form ({
+	title: '投稿を編輯',
+	description: `投稿 ${ row.sourceRow } の内容を確認し、必要な項目を編輯してください．`,
+	cancelText: '取消',
+	size: 'large',
+	body: controls => (
+	    <PostImportRowForm
+		row={row}
+		controls={controls}
+		onSave={saveRowDraft}/>) })
+  }
+
+  const editRow = async (row: PostImportRow) => {
+    setEditingRow (row)
+    try
+    {
+      await openEditingDialogue (row)
+    }
+    finally
+    {
+      setEditingRow (current =>
+          current?.sourceRow === row.sourceRow
+          ? null
+          : current)
+    }
+  }
 
   const retry = async (sourceRow: number) => {
-    if (session == null || sessionId == null)
+    if (session == null || sessionId == null || loadingRow != null)
+      return
+
+    const initialSession = sessionRef.current
+    if (initialSession == null)
       return
 
     setLoadingRow (sourceRow)
+    const originalRow = initialSession.rows.find (row => row.sourceRow === sourceRow)
+    if (originalRow == null)
+      {
+        setLoadingRow (null)
+        return
+      }
     try
-      {
-	const pendingRows = retryImportRow (session.rows, sourceRow)
-	setSession ({ ...session, rows: pendingRows })
-	const validated = await apiPost<{ rows: PostImportRow[] }> ('/posts/import/validate', {
-	    rows: pendingRows
-		.filter (row => row.importStatus !== 'created')
-		.map (row => ({
-		    sourceRow: row.sourceRow,
-		    url: row.url,
-		    attributes: row.attributes,
-		    provenance: row.provenance,
-		    tagSources: row.tagSources,
-		    metadataUrl: row.metadataUrl })),
-	    changed_row: -1 })
-	const validatedRows = mergeValidatedImportRows (
-	    pendingRows,
-	    initialisePreviewRows (validated.rows))
-	const nextSession = {
-	    ...session,
-	    rows: validatedRows,
-	    repairMode: 'failed' as const }
-	setSession (nextSession)
-	const target = validatedRows.find (_1 => _1.sourceRow === sourceRow)
-	if (target == null)
-	  return
-	if (Object.keys (target.validationErrors ?? { }).length > 0)
-	  {
-	    const saved = savePostImportSession (sessionId, nextSession, message =>
-		toast ({ title: '取込状態を保存できませんでした', description: message }))
-	    if (saved)
-	      navigate (`/posts/import/${ sessionId }/review?edit=${ sourceRow }`)
-	    return
-	  }
+    {
+      const pendingRows = retryImportRow (initialSession.rows, sourceRow)
+      const pendingSession = { ...initialSession, rows: pendingRows }
+      sessionRef.current = pendingSession
+      setSession (pendingSession)
+      persistSession (pendingSession)
+      const requestedRows = pendingRows.filter (row => row.importStatus !== 'created')
+      const validated = await apiPost<{ rows: PostImportRow[] }> ('/posts/import/validate', {
+          rows: requestedRows.map (row => ({
+                  sourceRow: row.sourceRow,
+                  url: row.url,
+                  attributes: row.attributes,
+                  provenance: row.provenance,
+                  tagSources: row.tagSources,
+                  metadataUrl: row.metadataUrl })),
+          changed_row: -1 })
+      const validatedRows = initialisePreviewRows (validated.rows)
+      if (!(hasExactSourceRows (requestedRows.map (row => row.sourceRow), validatedRows)))
+        {
+          const latest = sessionRef.current ?? pendingSession
+          const restoredRows = replaceImportRow (latest.rows, originalRow)
+          const restoredSession = {
+              ...latest,
+              rows: restoredRows,
+              repairMode: resultRepairMode (restoredRows) }
+          sessionRef.current = restoredSession
+          setSession (restoredSession)
+          persistSession (restoredSession)
+          toast ({ title: '再検証結果が不完全でした' })
+          return
+        }
+      const validatedTarget = validatedRows.find (
+          row => row.sourceRow === sourceRow)
+      if (validatedTarget == null)
+        {
+          const latest = sessionRef.current ?? pendingSession
+          const restoredRows = replaceImportRow (latest.rows, originalRow)
+          const restoredSession = {
+              ...latest,
+              rows: restoredRows,
+              repairMode: resultRepairMode (restoredRows) }
+          sessionRef.current = restoredSession
+          setSession (restoredSession)
+          persistSession (restoredSession)
+          toast ({ title: '再検証結果が不完全でした' })
+          return
+        }
+      const latestAfterValidate = sessionRef.current ?? pendingSession
+      const mergedValidatedRows = mergeValidatedImportRow (
+          latestAfterValidate.rows,
+          validatedTarget)
+      const nextSession = {
+          ...latestAfterValidate,
+          rows: mergedValidatedRows,
+          repairMode: resultRepairMode (mergedValidatedRows) }
+      sessionRef.current = nextSession
+      setSession (nextSession)
+      persistSession (nextSession)
+      const target = mergedValidatedRows.find (row => row.sourceRow === sourceRow)
+      if (target == null)
+        {
+          const restoredRows = replaceImportRow (latestAfterValidate.rows, originalRow)
+          const restoredSession = {
+              ...latestAfterValidate,
+              rows: restoredRows,
+              repairMode: resultRepairMode (restoredRows) }
+          sessionRef.current = restoredSession
+          setSession (restoredSession)
+          persistSession (restoredSession)
+          toast ({ title: '再検証結果が不完全でした' })
+          return
+        }
+      if (Object.keys (target.validationErrors ?? { }).length > 0)
+        {
+          const saved = savePostImportSession (sessionId, nextSession, message =>
+              toast ({ title: '取込状態を保存できませんでした', description: message }))
+          if (saved)
+            void editRow (target)
+          return
+        }
 
-	const result = await apiPost<{
-	    created: number
-	    skipped: number
-	    failed:  number
-	    rows:    PostImportResultRow[] }> ('/posts/import', {
-		rows: [{
-		    sourceRow: target.sourceRow,
-		    url: target.url,
-		    attributes: target.attributes,
-		    provenance: target.provenance,
-		    tagSources: target.tagSources,
-		    metadataUrl: target.metadataUrl }] })
-	const mergedRows = mergeImportResults (nextSession.rows, result.rows)
-	const recoverableRows = result.rows.filter (row =>
-	    row.status === 'failed'
-	    && row.recoverable
-	    && Object.keys (row.errors ?? { }).length > 0)
-	const nextRows = mergedRows.map ((row): PostImportRow => {
-	  const recoverable = recoverableRows.find (_1 => _1.sourceRow === row.sourceRow)
-	  if (recoverable == null)
-	    return row
-	  return {
-	      ...row,
-	      importStatus: 'pending',
-	      validationErrors: recoverable.errors ?? { },
-	      importErrors: undefined }
-	})
-	const recoverableTarget = nextRows.find (_1 => _1.sourceRow === sourceRow)
-	const resultSession = {
-	    ...nextSession,
-	    rows: nextRows,
-	    repairMode: recoverableTarget == null ? 'all' as const : 'failed' as const }
-	setSession (resultSession)
-	if (recoverableTarget != null
-	    && Object.keys (recoverableTarget.validationErrors).length > 0)
-	  {
-	    const saved = savePostImportSession (sessionId, resultSession, message =>
-		toast ({ title: '取込状態を保存できませんでした', description: message }))
-	    if (saved)
-	      navigate (`/posts/import/${ sessionId }/review?edit=${ sourceRow }`)
-	    return
-	  }
-      }
+      const result = await apiPost<{
+          created: number
+          skipped: number
+          failed:  number
+          rows:    PostImportResultRow[] }> ('/posts/import', {
+              rows: [{
+                  sourceRow: target.sourceRow,
+                  url: target.url,
+                  attributes: target.attributes,
+                  provenance: target.provenance,
+                  tagSources: target.tagSources,
+                  metadataUrl: target.metadataUrl }] })
+      if (!(hasExactSourceRows ([sourceRow], result.rows)))
+        {
+          const latest = sessionRef.current ?? nextSession
+          const restoredRows = replaceImportRow (latest.rows, originalRow)
+          const restoredSession = {
+              ...latest,
+              rows: restoredRows,
+              repairMode: resultRepairMode (restoredRows) }
+          sessionRef.current = restoredSession
+          setSession (restoredSession)
+          persistSession (restoredSession)
+          toast ({ title: '登録結果が不完全でした' })
+          return
+        }
+      const latestAfterImport = sessionRef.current ?? nextSession
+      const mergedRows = mergeImportResults (latestAfterImport.rows, result.rows)
+      const recoverableRows = result.rows.filter (row =>
+          row.status === 'failed'
+          && row.recoverable
+          && Object.keys (row.errors ?? { }).length > 0)
+      const nextRows = mergedRows.map ((row): PostImportRow => {
+        const recoverable = recoverableRows.find (
+            recoverableRow => recoverableRow.sourceRow === row.sourceRow)
+        if (recoverable == null)
+          return row
+        return {
+            ...row,
+            importStatus: 'pending',
+            recoverable: true,
+            validationErrors: recoverable.errors ?? { },
+            importErrors: undefined }
+      })
+      const recoverableTarget = nextRows.find (row => row.sourceRow === sourceRow)
+      const resultSession = {
+          ...nextSession,
+          rows: nextRows,
+          repairMode: resultRepairMode (nextRows) }
+      sessionRef.current = resultSession
+      setSession (resultSession)
+      persistSession (resultSession)
+      if (recoverableTarget != null
+          && Object.keys (recoverableTarget.validationErrors).length > 0)
+        {
+          const saved = savePostImportSession (sessionId, resultSession, message =>
+              toast ({ title: '取込状態を保存できませんでした', description: message }))
+          if (saved)
+            void editRow (recoverableTarget)
+          return
+        }
+    }
     catch
-      {
-	setSession (session)
-	toast ({ title: '再試行に失敗しました' })
-      }
+    {
+      const latest = sessionRef.current
+      if (latest != null)
+        {
+          const restoredRows = replaceImportRow (latest.rows, originalRow)
+          const restoredSession = {
+              ...latest,
+              rows: restoredRows,
+              repairMode: resultRepairMode (restoredRows) }
+          sessionRef.current = restoredSession
+          setSession (restoredSession)
+          persistSession (restoredSession)
+        }
+      toast ({ title: '再試行に失敗しました' })
+    }
     finally
-      {
-	setLoadingRow (null)
-      }
+    {
+      setLoadingRow (null)
+    }
   }
 
   const openRepair = (sourceRow: number) => {
-    if (session == null || sessionId == null)
+    const currentSession = sessionRef.current
+    if (currentSession == null || sessionId == null || loadingRow != null)
       return
 
-    const nextSession = { ...session, repairMode: 'failed' as const }
+    const nextSession = { ...currentSession, repairMode: 'failed' as const }
+    sessionRef.current = nextSession
     setSession (nextSession)
     const saved = savePostImportSession (sessionId, nextSession, message =>
 	toast ({ title: '取込状態を保存できませんでした', description: message }))
     if (!(saved))
       return
-    navigate (`/posts/import/${ sessionId }/review?edit=${ sourceRow }`)
+    const row = nextSession.rows.find (rowValue => rowValue.sourceRow === sourceRow)
+    if (row != null)
+      void editRow (row)
   }
 
   if (!(editable))
@@ -206,10 +445,8 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
 	  <div className="space-y-3">
 	    {session.rows.map (row => {
 	      const displayStatus = displayPostImportStatus (row)
-	      const canEdit = row.importStatus === 'failed'
-	      const canRetry =
-		  row.importStatus === 'failed'
-		  && Object.keys (row.validationErrors).length === 0
+	      const canEdit = canEditResultRow (row)
+	      const canRetry = canRetryResultRow (row)
 	      return (
 		  <div
 		      key={row.sourceRow}
@@ -227,7 +464,17 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
 			<div className="text-xs text-neutral-500 dark:text-neutral-400">
 			  {row.url}
 			</div>
-			<FieldError messages={rowMessages (row)}/>
+			<div className="text-xs text-neutral-500 dark:text-neutral-400">
+			  {String (row.attributes.tags ?? '') || 'タグなし'}
+			</div>
+			<div className="text-xs text-neutral-500 dark:text-neutral-400">
+			  {originalCreatedAtString (
+			      row.attributes.originalCreatedFrom?.toString () ?? null,
+			      row.attributes.originalCreatedBefore?.toString () ?? null)}
+			  {row.attributes.duration ? ` / ${ row.attributes.duration }` : ''}
+			</div>
+			<FieldWarning messages={resultRowWarnings (row)}/>
+			<FieldError messages={resultRowMessages (row)}/>
 		      </div>
 
 		      <div className="flex flex-col gap-2 sm:flex-row">
@@ -242,14 +489,15 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
 			    <Button
 				type="button"
 				variant="outline"
-				onClick={() => openRepair (row.sourceRow)}>
+				onClick={() => openRepair (row.sourceRow)}
+				disabled={busy}>
 			      編輯
 			    </Button>)}
 			{canRetry && (
 			    <Button
 				type="button"
 				onClick={() => retry (row.sourceRow)}
-				disabled={loadingRow === row.sourceRow}>
+				disabled={busy}>
 			      再試行
 			    </Button>)}
 		      </div>
@@ -261,8 +509,13 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
 	      <Button
 		  type="button"
 		  variant="outline"
+		  disabled={busy}
 		  onClick={() => {
-		      const nextSession = { ...session, repairMode: 'all' as const }
+		      const currentSession = sessionRef.current
+		      if (currentSession == null)
+			return
+		      const nextSession = { ...currentSession, repairMode: 'all' as const }
+		      sessionRef.current = nextSession
 		      setSession (nextSession)
 		      const saved = savePostImportSession (sessionId, nextSession, message =>
 			  toast ({ title: '取込状態を保存できませんでした', description: message }))
@@ -275,6 +528,7 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
 	      <Button
 		  type="button"
 		  variant="outline"
+		  disabled={busy}
 		  onClick={() => {
 		      clearPostImportSourceDraft (message =>
 			  toast ({ title: '入力内容を削除できませんでした', description: message }))

frontend/src/pages/posts/PostImportReviewPage.test.tsx

@@ -1,78 +1,295 @@
-import { fireEvent, screen, waitFor } from '@testing-library/react'
-import { Route, Routes } from 'react-router-dom'
+import { fireEvent, render, screen, waitFor } from '@testing-library/react'
+import { HelmetProvider } from 'react-helmet-async'
+import { MemoryRouter, Route, Routes } from 'react-router-dom'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
-import { savePostImportSession } from '@/lib/postImportSession'
+import { loadPostImportSession, savePostImportSession } from '@/lib/postImportSession'
 import PostImportReviewPage from '@/pages/posts/PostImportReviewPage'
 import { buildUser } from '@/test/factories'
 import { buildPostImportRow } from '@/test/postImportFactories'
-import { renderWithProviders } from '@/test/render'
 
-const api = vi.hoisted (() => ({ apiPost: vi.fn () }))
-const toastApi = vi.hoisted (() => ({ toast: vi.fn () }))
+import type { DialogueFormAction, DialogueFormControls } from '@/lib/dialogues/useDialogue'
+import type { PostImportRow } from '@/lib/postImportSession'
+
+const api = vi.hoisted (() => ({
+  apiGet: vi.fn (),
+  apiPost: vi.fn (),
+}))
+
+const toastApi = vi.hoisted (() => ({
+  toast: vi.fn (),
+}))
+
+const dialogue = vi.hoisted (() => ({
+  form: vi.fn (() => Promise.resolve ()),
+}))
 
 vi.mock ('@/lib/api', () => api)
 vi.mock ('@/components/ui/use-toast', () => toastApi)
-
-const renderPage = () => renderWithProviders (
-    <Routes>
-      <Route
-	  path="/posts/import/:sessionId/review"
-	  element={<PostImportReviewPage user={buildUser ()}/>}/>
-      <Route path="/posts/import/:sessionId/result" element={<div>result route</div>}/>
-    </Routes>,
-    { route: '/posts/import/session/review' })
+vi.mock ('@/lib/dialogues/useDialogue', () => ({
+  default: () => dialogue,
+}))
 
 describe ('PostImportReviewPage', () => {
   beforeEach (() => {
     sessionStorage.clear ()
     vi.clearAllMocks ()
+    globalThis.URL.createObjectURL = vi.fn (() => 'blob:preview')
+    globalThis.URL.revokeObjectURL = vi.fn ()
+    api.apiGet.mockResolvedValue (new Blob (['img'], { type: 'image/png' }))
   })
 
-  it ('keeps the review route and opens the first invalid row dialogue', async () => {
-    const row = buildPostImportRow ({ attributes: { title: 'title' } })
-    savePostImportSession ('session', { source: row.url, rows: [row], repairMode: 'all' })
-    api.apiPost.mockResolvedValue ({ rows: [buildPostImportRow ({
-      attributes: { title: 'title' },
-      status: 'error',
-      validationErrors: { title: ['タイトルを確認してください．'] } })] })
-
-    renderPage ()
-    fireEvent.click (await screen.findByRole ('button', { name: '取込実行' }))
-
-    expect (await screen.findByText ('投稿を編輯')).toBeInTheDocument ()
-    expect (screen.getByText ('タイトルを確認してください．')).toBeInTheDocument ()
-    expect (api.apiPost).toHaveBeenCalledTimes (1)
-    expect (screen.queryByText ('result route')).not.toBeInTheDocument ()
-  })
-
-  it ('submits existing rows for a formal skipped result and opens result route', async () => {
-    const row = buildPostImportRow ({
-      skipReason: 'existing',
-      existingPostId: 10 })
-    savePostImportSession ('session', { source: row.url, rows: [row], repairMode: 'all' })
+  it ('navigates to the result route after an initial recoverable failure', async () => {
+    savePostImportSession ('review-session', {
+      source: 'https://example.com/post',
+      repairMode: 'all',
+      rows: [buildPostImportRow ({ sourceRow: 1 })] })
     api.apiPost
-	.mockResolvedValueOnce ({ rows: [row] })
-	.mockResolvedValueOnce ({
-	  created: 0,
-	  skipped: 1,
-	  failed: 0,
-	  rows: [{ sourceRow: 1, status: 'skipped', existingPostId: 10 }] })
+        .mockResolvedValueOnce ({
+          rows: [buildPostImportRow ({ sourceRow: 1 })] })
+        .mockResolvedValueOnce ({
+          created: 0,
+          skipped: 0,
+          failed: 1,
+          rows: [{
+            sourceRow: 1,
+            status: 'failed',
+            recoverable: true,
+            errors: { title: ['invalid'] } }] })
 
-    renderPage ()
-    fireEvent.click (await screen.findByRole ('button', { name: '取込実行' }))
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/review-session/review']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/review"
+                  element={<PostImportReviewPage user={buildUser ()}/>}/>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<div>RESULT ROUTE</div>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '取込実行' }))
 
-    expect (await screen.findByText ('result route')).toBeInTheDocument ()
-    expect (api.apiPost).toHaveBeenCalledTimes (2)
-    expect (api.apiPost.mock.calls[1]?.[1]).toMatchObject ({
-      rows: [expect.objectContaining ({ sourceRow: 1, url: row.url })] })
     await waitFor (() => {
-      const saved = JSON.parse (
-	  sessionStorage.getItem ('post-import-session:session') ?? '{}')
-      expect (saved.rows[0]).toMatchObject ({
-	importStatus: 'skipped',
-	existingPostId: 10,
-	skipReason: 'existing' })
+      expect (screen.getByText ('RESULT ROUTE')).toBeInTheDocument ()
+    })
+    expect (dialogue.form).not.toHaveBeenCalled ()
+  })
+
+  it ('disables row editing and navigation while batch import is running', async () => {
+    let resolveValidation: ((value: { rows: PostImportRow[] }) => void) | null = null
+    savePostImportSession ('review-loading', {
+      source: 'https://example.com/post',
+      repairMode: 'all',
+      rows: [buildPostImportRow ({ sourceRow: 1 })] })
+    api.apiPost.mockImplementationOnce (() =>
+        new Promise<{ rows: PostImportRow[] }> (resolve => {
+          resolveValidation = resolve
+        }))
+    api.apiPost.mockResolvedValueOnce ({
+      created: 0,
+      skipped: 0,
+      failed: 0,
+      rows: [] })
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/review-loading/review']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/review"
+                  element={<PostImportReviewPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '取込実行' }))
+
+    await waitFor (() => {
+      expect (screen.getByRole ('button', { name: '編輯' })).toBeDisabled ()
+      expect (screen.getByRole ('button', { name: 'URL リスト入力へ戻る' })).toBeDisabled ()
+      expect (screen.getByRole ('button', { name: '取込実行' })).toBeDisabled ()
+    })
+
+    resolveValidation?.({ rows: [buildPostImportRow ({ sourceRow: 1 })] })
+  })
+
+  it ('does not call import when validation omits a requested source row', async () => {
+    savePostImportSession ('review-missing-row', {
+      source: 'https://example.com/post-1\nhttps://example.com/post-2',
+      repairMode: 'all',
+      rows: [
+        buildPostImportRow ({ sourceRow: 1 }),
+        buildPostImportRow ({ sourceRow: 2 })] })
+    api.apiPost.mockResolvedValueOnce ({
+      rows: [buildPostImportRow ({ sourceRow: 1 })] })
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/review-missing-row/review']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/review"
+                  element={<PostImportReviewPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '取込実行' }))
+
+    await waitFor (() => {
+      expect (toastApi.toast).toHaveBeenCalledWith (
+          expect.objectContaining ({ title: '再検証結果が不完全でした' }))
+    })
+    expect (api.apiPost).toHaveBeenCalledTimes (1)
+  })
+
+  it ('does not navigate to result when import omits a requested source row', async () => {
+    savePostImportSession ('review-missing-import-row', {
+      source: 'https://example.com/post',
+      repairMode: 'all',
+      rows: [buildPostImportRow ({ sourceRow: 1 })] })
+    api.apiPost
+        .mockResolvedValueOnce ({
+          rows: [buildPostImportRow ({ sourceRow: 1 })] })
+        .mockResolvedValueOnce ({
+          created: 1,
+          skipped: 0,
+          failed: 0,
+          rows: [] })
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/review-missing-import-row/review']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/review"
+                  element={<PostImportReviewPage user={buildUser ()}/>}/>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<div>RESULT ROUTE</div>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '取込実行' }))
+
+    await waitFor (() => {
+      expect (toastApi.toast).toHaveBeenCalledWith (
+          expect.objectContaining ({ title: '登録結果が不完全でした' }))
+    })
+    expect (screen.queryByText ('RESULT ROUTE')).not.toBeInTheDocument ()
+  })
+
+  it ('keeps edited recoverable rows in session before the next batch submit', async () => {
+    savePostImportSession ('review-edit-retry', {
+      source: 'https://example.com/post',
+      repairMode: 'failed',
+      rows: [buildPostImportRow ({
+        sourceRow: 1,
+        attributes: { title: 'old title' },
+        importStatus: 'failed',
+        recoverable: true,
+        importErrors: { base: ['failed'] } })] })
+    api.apiPost
+        .mockResolvedValueOnce ({
+          rows: [buildPostImportRow ({
+            sourceRow: 1,
+            attributes: { title: 'edited title' },
+            importStatus: 'pending',
+            recoverable: true })] })
+        .mockResolvedValueOnce ({
+          rows: [buildPostImportRow ({
+            sourceRow: 1,
+            attributes: { title: 'edited title' },
+            importStatus: 'pending',
+            recoverable: true })] })
+        .mockResolvedValueOnce ({
+          created: 0,
+          skipped: 0,
+          failed: 1,
+          rows: [{
+            sourceRow: 1,
+            status: 'failed',
+            recoverable: true,
+            errors: { title: ['invalid'] } }] })
+    dialogue.form.mockImplementationOnce (async options => {
+      let actions: DialogueFormAction[] = []
+      const controls: DialogueFormControls = {
+        close: vi.fn (),
+        confirm: vi.fn (),
+        setActions: next => {
+          actions = next
+        } }
+
+      render (options.body (controls))
+      await waitFor (() => expect (actions.length).toBe (2))
+      fireEvent.change (screen.getByDisplayValue ('old title'), {
+        target: { value: 'edited title' } })
+      await actions.find (action => action.label === '編輯内容を保存')?.onSelect ()
+    })
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/review-edit-retry/review']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/review"
+                  element={<PostImportReviewPage user={buildUser ()}/>}/>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<div>RESULT ROUTE</div>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '編輯' }))
+
+    await waitFor (() => {
+      const saved = loadPostImportSession ('review-edit-retry')
+      expect (saved?.rows[0]?.attributes.title).toBe ('edited title')
+      expect (saved?.rows[0]?.importStatus).toBe ('pending')
+    })
+
+    fireEvent.click (screen.getByRole ('button', { name: '取込実行' }))
+
+    await waitFor (() => {
+      expect (api.apiPost.mock.calls[1]?.[1]?.rows?.[0]?.attributes?.title)
+          .toBe ('edited title')
     })
   })
+
+  it ('sorts recoverable pending validation rows to the top in repair mode', () => {
+    savePostImportSession ('review-repair-sort', {
+      source: '',
+      repairMode: 'failed',
+      rows: [
+        buildPostImportRow ({
+          sourceRow: 2,
+          attributes: { title: 'normal row' } }),
+        buildPostImportRow ({
+          sourceRow: 1,
+          attributes: { title: 'repair row' },
+          importStatus: 'pending',
+          recoverable: true,
+          validationErrors: { title: ['invalid'] } })] })
+
+    const { container } = render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/review-repair-sort/review']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/review"
+                  element={<PostImportReviewPage user={buildUser ()}/>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    const titles = Array.from (container.querySelectorAll ('.line-clamp-2')).map (
+        node => node.textContent)
+    expect (titles[0]).toBe ('repair row')
+  })
 })

frontend/src/pages/posts/PostImportReviewPage.tsx

@@ -1,6 +1,6 @@
-import { useEffect, useMemo, useState } from 'react'
+import { useEffect, useMemo, useRef, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
-import { useNavigate, useParams, useSearchParams } from 'react-router-dom'
+import { useNavigate, useParams } from 'react-router-dom'
 
 import PageTitle from '@/components/common/PageTitle'
 import MainArea from '@/components/layout/MainArea'
@@ -13,11 +13,17 @@ import { apiPost } from '@/lib/api'
 import useDialogue from '@/lib/dialogues/useDialogue'
 import { canEditContent } from '@/lib/users'
 import { loadPostImportSession,
+	 buildNextEditedRow,
+	 canEditReviewRow,
 	 creatableImportRows,
+	 hasExactSourceRows,
 	 initialisePreviewRows,
 	 mergeImportResults,
+	 mergeValidatedImportRow,
 	 mergeValidatedImportRows,
 	 processableImportRows,
+	 replaceImportRow,
+	 resultRepairMode,
 	 reviewSummaryCounts,
 	 savePostImportSession } from '@/lib/postImportSession'
 import Forbidden from '@/pages/Forbidden'
@@ -32,17 +38,24 @@ import type { User } from '@/types'
 
 type Props = { user: User | null }
 
+const isRepairRow = (row: PostImportRow): boolean =>
+    row.recoverable === true
+    && (row.importStatus === 'failed'
+        || (row.importStatus === 'pending'
+            && Object.keys (row.validationErrors).length > 0))
+
 
 const PostImportReviewPage: FC<Props> = ({ user }) => {
   const editable = canEditContent (user)
   const dialogue = useDialogue ()
   const navigate = useNavigate ()
   const { sessionId } = useParams ()
-  const [searchParams, setSearchParams] = useSearchParams ()
 
   const [session, setSession] = useState<PostImportSession | null> (null)
   const [loading, setLoading] = useState (false)
   const [missing, setMissing] = useState (false)
+  const [editingRow, setEditingRow] = useState<PostImportRow | null> (null)
+  const sessionRef = useRef<PostImportSession | null> (null)
 
   useEffect (() => {
     if (sessionId == null)
@@ -62,12 +75,11 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 	toast ({ title: '取込状態を保存できませんでした', description: message }))
   }, [session, sessionId])
 
+  useEffect (() => {
+    sessionRef.current = session
+  }, [session])
+
   const rows = session?.rows ?? []
-  const editingSourceRow = Number (searchParams.get ('edit') ?? '')
-  const editingRow =
-      Number.isFinite (editingSourceRow)
-      ? rows.find (_1 => _1.sourceRow === editingSourceRow) ?? null
-      : null
   const counts = useMemo (() => reviewSummaryCounts (rows), [rows])
   const processable = useMemo (
       () => processableImportRows (rows),
@@ -79,9 +91,9 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
       session?.repairMode === 'failed'
       ? (
 	  [...rows].sort ((a, b) => {
-	    const aFailed = a.importStatus === 'failed' ? 0 : 1
-	    const bFailed = b.importStatus === 'failed' ? 0 : 1
-	    return aFailed - bFailed || a.sourceRow - b.sourceRow
+	    const aRepair = isRepairRow (a) ? 0 : 1
+	    const bRepair = isRepairRow (b) ? 0 : 1
+	    return aRepair - bRepair || a.sourceRow - b.sourceRow
 	  }))
       : rows
 
@@ -93,41 +105,37 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
     element?.scrollIntoView ({ block: 'center', behavior: 'smooth' })
   }, [editingRow, session?.repairMode])
 
-  const updateSessionRows = (nextRows: PostImportRow[]) =>
-      setSession (current =>
-	  current != null ? { ...current, rows: nextRows } : current)
-
   const saveDraft = async (
-      { draft, resetRequested, resetSnapshot }: {
+      row: PostImportRow,
+      { draft, resetRequested }: {
 	  draft:            PostImportRowDraft
-	  resetRequested:   boolean
-	  resetSnapshot:    PostImportRow['resetSnapshot'] },
+	  resetRequested:   boolean },
   ): Promise<{ saved: boolean
 	       row:   PostImportRow | null }> => {
-    if (session == null)
+    const currentSession = sessionRef.current
+    if (currentSession == null)
       return { saved: false, row: null }
-
-    if (editingRow == null)
+    if (!(canEditReviewRow (row)))
       return { saved: false, row: null }
 
     const baseRow =
 	resetRequested
-	? { ...editingRow,
-	    url: resetSnapshot.url,
-	    attributes: { ...resetSnapshot.attributes },
-	    provenance: { ...resetSnapshot.provenance },
-	    tagSources: { ...resetSnapshot.tagSources },
+	? { ...row,
+	    url: row.resetSnapshot.url,
+	    attributes: { ...row.resetSnapshot.attributes },
+	    provenance: { ...row.resetSnapshot.provenance },
+	    tagSources: { ...row.resetSnapshot.tagSources },
 	    fieldWarnings: Object.fromEntries (
-		Object.entries (resetSnapshot.fieldWarnings)
+		Object.entries (row.resetSnapshot.fieldWarnings)
 		    .map (([key, values]) => [key, [...values]])),
-	    baseWarnings: [...resetSnapshot.baseWarnings],
-	    metadataUrl: resetSnapshot.metadataUrl }
-	: editingRow
+	    baseWarnings: [...row.resetSnapshot.baseWarnings],
+	    metadataUrl: row.resetSnapshot.metadataUrl }
+	: row
     const urlChanged = draft.url !== baseRow.url
     const nextRow = buildNextEditedRow (baseRow, draft, urlChanged)
 
-    const nextRows = session.rows.map (row =>
-		row.sourceRow === editingRow.sourceRow
+    const nextRows = currentSession.rows.map (row =>
+		row.sourceRow === baseRow.sourceRow
 		? nextRow
 		: row)
     try
@@ -142,13 +150,38 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 			      provenance: row.provenance,
 			      tagSources: row.tagSources,
 			      metadataUrl: row.metadataUrl })),
-	  changed_row: urlChanged ? editingRow.sourceRow : -1 })
+	  changed_row: urlChanged ? baseRow.sourceRow : -1 })
       const validatedRows = initialisePreviewRows (validated.rows)
-      const target = validatedRows.find (row => row.sourceRow === editingRow.sourceRow)
-      if (target != null && Object.keys (target.validationErrors).length > 0)
-	return { saved: false, row: target }
-      updateSessionRows (mergeValidatedImportRows (nextRows, validatedRows))
-      setSearchParams ({ })
+      const target = validatedRows.find (
+          validatedRow => validatedRow.sourceRow === baseRow.sourceRow)
+      const latestSession = sessionRef.current
+      if (latestSession == null)
+        return { saved: false, row: null }
+      if (target == null)
+        {
+          const restoredRows = replaceImportRow (latestSession.rows, row)
+          const restoredSession = {
+              ...latestSession,
+              rows: restoredRows,
+              repairMode: resultRepairMode (restoredRows) }
+          sessionRef.current = restoredSession
+          setSession (restoredSession)
+          toast ({ title: '行の再検証結果が不完全でした' })
+          return { saved: false, row: null }
+        }
+      const editedRows = replaceImportRow (latestSession.rows, nextRow)
+      const rows = mergeValidatedImportRow (editedRows, target)
+      const nextSession = {
+          ...latestSession,
+          rows,
+          repairMode: resultRepairMode (rows) }
+      sessionRef.current = nextSession
+      setSession (nextSession)
+      const mergedTarget =
+          rows.find (mergedRow => mergedRow.sourceRow === baseRow.sourceRow)
+          ?? target
+      if (Object.keys (mergedTarget.validationErrors).length > 0)
+        return { saved: false, row: mergedTarget }
       return { saved: true, row: null }
     }
     catch
@@ -164,10 +197,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 	    draft:          PostImportRowDraft
 	    resetRequested: boolean },
     ) =>
-	saveDraft ({
-	    draft,
-	    resetRequested,
-	    resetSnapshot: row.resetSnapshot })
+	saveDraft (row, { draft, resetRequested })
 
     await dialogue.form ({
 	title: '投稿を編輯',
@@ -179,43 +209,73 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 		row={row}
 		controls={controls}
 		onSave={saveRowDraft}/>) })
-    setSearchParams ({ })
   }
 
-  useEffect (() => {
-    if (editingRow == null)
-      return
-
-    void openEditingDialogue (editingRow)
-  }, [editingRow])
+  const editRow = async (row: PostImportRow) => {
+    setEditingRow (row)
+    try
+    {
+      await openEditingDialogue (row)
+    }
+    finally
+    {
+      setEditingRow (current =>
+          current?.sourceRow === row.sourceRow
+          ? null
+          : current)
+    }
+  }
 
   const submit = async () => {
-    if (sessionId == null || session == null || processable.length === 0)
+    const currentSession = sessionRef.current
+    if (sessionId == null || currentSession == null || processable.length === 0)
       return
 
     setLoading (true)
     try
     {
+      const validatableRows =
+          currentSession.rows.filter (row => row.importStatus !== 'created')
       const validated = await apiPost<{ rows: PostImportRow[] }> ('/posts/import/validate', {
 	  rows:
-	      session.rows
-	      .filter (row => row.importStatus !== 'created')
-	      .map (row => ({ sourceRow: row.sourceRow,
-			      url: row.url,
-			      attributes: row.attributes,
-			      provenance: row.provenance,
-			      tagSources: row.tagSources,
-			      metadataUrl: row.metadataUrl })),
+	      validatableRows.map (row => ({ sourceRow: row.sourceRow,
+					     url: row.url,
+					     attributes: row.attributes,
+					     provenance: row.provenance,
+					     tagSources: row.tagSources,
+					     metadataUrl: row.metadataUrl })),
 	  changed_row: -1 })
       const validatedRows = initialisePreviewRows (validated.rows)
-      const mergedRows = mergeValidatedImportRows (session.rows, validatedRows)
+      const expectedSourceRows = validatableRows.map (row => row.sourceRow)
+      if (!(hasExactSourceRows (expectedSourceRows, validatedRows)))
+        {
+          toast ({ title: '再検証結果が不完全でした' })
+          return
+        }
+      const latestAfterValidate = sessionRef.current ?? currentSession
+      const mergedRows = mergeValidatedImportRows (latestAfterValidate.rows, validatedRows)
       const firstInvalid = mergedRows.find (row => Object.keys (row.validationErrors).length > 0)
       if (firstInvalid != null)
 	{
-	  setSession ({ ...session, rows: mergedRows })
-	  setSearchParams ({ edit: String (firstInvalid.sourceRow) })
+	  const nextSession = {
+              ...latestAfterValidate,
+              rows: mergedRows,
+              repairMode: resultRepairMode (mergedRows) }
+	  sessionRef.current = nextSession
+	  setSession (nextSession)
+	  void editRow (firstInvalid)
 	  return
 	}
+      const validatedSession = {
+          ...latestAfterValidate,
+          rows: mergedRows,
+          repairMode: resultRepairMode (mergedRows) }
+      sessionRef.current = validatedSession
+      setSession (validatedSession)
+      const savedValidated = savePostImportSession (sessionId, validatedSession, message =>
+	  toast ({ title: '取込状態を保存できませんでした', description: message }))
+      if (!(savedValidated))
+	return
 
       const result = await apiPost<{
 	  created: number
@@ -229,7 +289,14 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 		  provenance: row.provenance,
 		  tagSources: row.tagSources,
 		  metadataUrl: row.metadataUrl })) })
-      const mergedResults = mergeImportResults (mergedRows, result.rows)
+      const expectedImportRows = processableImportRows (mergedRows).map (row => row.sourceRow)
+      if (!(hasExactSourceRows (expectedImportRows, result.rows)))
+	{
+	  toast ({ title: '登録結果が不完全でした' })
+	  return
+	}
+      const latestAfterImport = sessionRef.current ?? validatedSession
+      const mergedResults = mergeImportResults (latestAfterImport.rows, result.rows)
       const recoverableRows = result.rows.filter (row =>
 	  row.status === 'failed'
 	  && row.recoverable
@@ -241,25 +308,15 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 	return {
 	    ...row,
 	    importStatus: 'pending',
+	    recoverable: true,
 	    validationErrors: recoverable.errors ?? { },
 	    importErrors: undefined }
       })
-      const firstRecoverable = nextRows.find (row =>
-	  Object.keys (row.validationErrors).length > 0
-	  && row.importStatus !== 'created')
-      if (firstRecoverable != null)
-	{
-	  const repairSession = { ...session,
-				  rows: nextRows,
-				  repairMode: 'failed' as const }
-	  setSession (repairSession)
-	  const saved = savePostImportSession (sessionId, repairSession, message =>
-	      toast ({ title: '取込状態を保存できませんでした', description: message }))
-	  if (saved)
-	    setSearchParams ({ edit: String (firstRecoverable.sourceRow) })
-	  return
-	}
-      const nextSession = { ...session, rows: nextRows, repairMode: 'all' as const }
+      const nextSession = {
+          ...latestAfterImport,
+          rows: nextRows,
+          repairMode: resultRepairMode (nextRows) }
+      sessionRef.current = nextSession
       setSession (nextSession)
       const saved = savePostImportSession (sessionId, nextSession, message =>
 	  toast ({ title: '取込状態を保存できませんでした', description: message }))
@@ -309,9 +366,8 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 		  <div key={row.sourceRow} id={`post-import-row-${ row.sourceRow }`}>
 		    <PostImportRowSummary
 			row={row}
-			onEdit={() => {
-			  setSearchParams ({ edit: String (row.sourceRow) })
-			}}/>
+			editDisabled={loading}
+			onEdit={() => void editRow (row)}/>
 		  </div>))}
 	    </div>
 	  </div>
@@ -351,7 +407,7 @@ const PostImportFooter = (
 	  <span>スキップ予定 {skipPlannedCount}件</span>
 	</div>
 	<div className="flex flex-col gap-2 sm:flex-row">
-	  <Button type="button" variant="outline" onClick={onBack}>
+	  <Button type="button" variant="outline" onClick={onBack} disabled={loading}>
 	    URL リスト入力へ戻る
 	  </Button>
 	  <Button
@@ -364,52 +420,4 @@ const PostImportFooter = (
       </div>
     </div>)
 
-const buildNextEditedRow = (
-    editingRow:  PostImportRow,
-    draft:       PostImportRowDraft,
-    urlChanged:  boolean,
-): PostImportRow => {
-    const nextProvenance = { ...editingRow.provenance }
-    const nextAttributes = { ...editingRow.attributes }
-    const nextTagSources = {
-	automatic: editingRow.tagSources?.automatic ?? '',
-	manual: editingRow.tagSources?.manual ?? '' }
-    const draftFields = [
-	['title', draft.title],
-	['thumbnailBase', draft.thumbnailBase],
-	['originalCreatedFrom', draft.originalCreatedFrom],
-	['originalCreatedBefore', draft.originalCreatedBefore],
-	['duration', draft.duration],
-	['parentPostIds', draft.parentPostIds]] as const
-    draftFields.forEach (([field, value]) => {
-	nextAttributes[field] = value
-	nextProvenance[field] =
-	    value !== String (editingRow.attributes[field] ?? '')
-	    ? 'manual'
-	    : (editingRow.provenance[field] ?? 'automatic')
-    })
-    nextAttributes.tags = draft.tags
-    if (draft.tags !== String (editingRow.attributes.tags ?? ''))
-      {
-	nextProvenance.tags = 'manual'
-	nextTagSources.manual = draft.tags
-      }
-    else
-      {
-	nextProvenance.tags = editingRow.provenance.tags ?? 'automatic'
-	nextTagSources.manual = editingRow.tagSources?.manual ?? ''
-      }
-
-    return {
-	...editingRow,
-	url: draft.url,
-	attributes: nextAttributes,
-	provenance: {
-	    ...nextProvenance,
-	    url: urlChanged ? 'manual' : (editingRow.provenance.url ?? 'manual') },
-	tagSources: nextTagSources,
-	importStatus: editingRow.importStatus === 'created' ? 'created' : 'pending',
-	importErrors: undefined }
-}
-
 export default PostImportReviewPage

frontend/src/pages/posts/PostImportSourcePage.test.tsx

@@ -86,7 +86,8 @@ describe ('PostImportSourcePage', () => {
 	  expect.stringMatching (/^\/posts\/import\/[^/]+\/review$/))
     })
     const sessionKeys = Array.from ({ length: sessionStorage.length }, (_, index) =>
-	sessionStorage.key (index)).filter (_1 => _1?.startsWith ('post-import-session:'))
+	sessionStorage.key (index)).filter (
+	    key => key?.startsWith ('post-import-session:'))
     expect (sessionKeys).toHaveLength (1)
   })
 })

frontend/src/pages/posts/PostImportSourcePage.tsx

@@ -60,7 +60,7 @@ const PostImportSourcePage: FC<Props> = ({ user }) => {
   const sourceDescribedBy =
       [sourceError != null ? SOURCE_ERROR_ID : null,
        sourceIssues.length > 0 ? SOURCE_ISSUES_ID : null]
-      .filter (_1 => _1 != null)
+      .filter (value => value != null)
       .join (' ')
 
   useEffect (() => {

frontend/src/pages/posts/PostNewPage.test.tsx

@@ -1,6 +1,7 @@
 import { fireEvent, screen, waitFor } from '@testing-library/react'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
+import { toMinutePrecisionIsoUtc } from '@/components/common/DateTimeField'
 import PostNewPage from '@/pages/posts/PostNewPage'
 import { buildUser } from '@/test/factories'
 import { renderWithProviders } from '@/test/render'
@@ -39,8 +40,8 @@ describe ('PostNewPage', () => {
     const textboxes = screen.getAllByRole ('textbox')
     fireEvent.change (textboxes[0], { target: { value: 'https://example.com/post' } })
     fireEvent.change (textboxes[1], { target: { value: '投稿タイトル' } })
-    fireEvent.change (textboxes[2], { target: { value: '1 2' } })
-    fireEvent.change (textboxes[3], { target: { value: 'tag1 tag2' } })
+    fireEvent.change (textboxes[3], { target: { value: '1 2' } })
+    fireEvent.change (textboxes[4], { target: { value: 'tag1 tag2' } })
     fireEvent.click (screen.getByRole ('button', { name: '追加' }))
 
     await waitFor (() => {
@@ -63,17 +64,19 @@ describe ('PostNewPage', () => {
 
     renderWithProviders (<PostNewPage user={buildUser ({ role: 'member' })}/>)
 
-    const tags = screen.getAllByRole ('textbox')[3]
+    const tags = screen.getAllByRole ('textbox')[4]
     fireEvent.change (tags, { target: { value: '動画' } })
-    fireEvent.change (screen.getByRole ('spinbutton'), { target: { value: '180.5' } })
+    fireEvent.change (
+        screen.getByPlaceholderText ('例: 2 / 2.5 / 1:23'),
+        { target: { value: '180.5' } })
 
     fireEvent.change (tags, { target: { value: 'general-tag' } })
-    expect (screen.queryByRole ('spinbutton')).not.toBeInTheDocument ()
+    expect (screen.queryByPlaceholderText ('例: 2 / 2.5 / 1:23')).not.toBeInTheDocument ()
 
     fireEvent.change (tags, {
       target: { value: '動画 general-tag' },
     })
-    expect (screen.getByRole ('spinbutton')).toHaveValue (180.5)
+    expect (screen.getByPlaceholderText ('例: 2 / 2.5 / 1:23')).toHaveValue ('180.5')
   })
 
   it ('shows 422 validation errors for post fields', async () => {
@@ -96,11 +99,64 @@ describe ('PostNewPage', () => {
     const textboxes = screen.getAllByRole ('textbox')
     fireEvent.change (textboxes[0], { target: { value: 'https://example.com/post' } })
     fireEvent.change (textboxes[1], { target: { value: '投稿タイトル' } })
-    fireEvent.change (textboxes[3], { target: { value: 'nico:nico_tag' } })
+    fireEvent.change (textboxes[4], { target: { value: 'nico:nico_tag' } })
     fireEvent.click (screen.getByRole ('button', { name: '追加' }))
 
     expect (await screen.findByText ('投稿内容を確認してください．')).toBeInTheDocument ()
     expect (screen.getByText ('ニコニコ・タグは直接指定できません．')).toBeInTheDocument ()
-    expect (screen.getAllByRole ('textbox')[3]).toHaveAttribute ('aria-invalid', 'true')
+    expect (screen.getAllByRole ('textbox')[4]).toHaveAttribute ('aria-invalid', 'true')
+  })
+
+  it ('uses the shared duration, tags, and datetime value contract for post submission', async () => {
+    api.apiPost.mockResolvedValueOnce ({})
+    api.apiGet.mockResolvedValue ([])
+
+    const { container } = renderWithProviders (<PostNewPage user={buildUser ({ role: 'member' })}/>)
+
+    const textboxes = screen.getAllByRole ('textbox')
+    fireEvent.change (textboxes[0], { target: { value: 'https://example.com/post' } })
+    fireEvent.change (textboxes[1], { target: { value: '投稿タイトル' } })
+    fireEvent.change (textboxes[4], { target: { value: '動画 tag1 tag2' } })
+    fireEvent.change (
+        screen.getByPlaceholderText ('例: 2 / 2.5 / 1:23'),
+        { target: { value: '2.5' } })
+    const datetimeInputs = container.querySelectorAll ('input[type="datetime-local"]')
+    fireEvent.change (datetimeInputs[0] as HTMLInputElement, {
+      target: { value: '2024-01-01T12:34' } })
+    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
+
+    await waitFor (() => expect (api.apiPost).toHaveBeenCalled ())
+
+    const formData = api.apiPost.mock.calls[0]?.[1] as FormData
+    expect (container.querySelector ('input[type="file"]')).not.toBeNull ()
+    expect (formData.get ('duration')).toBe ('2.5')
+    expect (formData.get ('tags')).toBe ('動画 tag1 tag2')
+    expect (formData.get ('original_created_from')).toBe (
+        toMinutePrecisionIsoUtc ('2024-01-01T12:34'))
+  })
+
+  it ('shows deduplicated original-created endpoint errors on the shared datetime field', async () => {
+    api.apiGet.mockResolvedValue ([])
+    api.isApiError.mockReturnValue (true)
+    api.apiPost.mockRejectedValueOnce ({
+      response: {
+        status: 422,
+        data:   {
+          type: 'validation_error',
+          errors: {
+            original_created_at: ['日時を確認してください．'],
+            original_created_from: ['日時を確認してください．'],
+            original_created_before: ['終了を確認してください．'] },
+        },
+      },
+    })
+
+    renderWithProviders (<PostNewPage user={buildUser ({ role: 'member' })}/>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
+
+    expect (await screen.findByText ('日時を確認してください．')).toBeInTheDocument ()
+    expect (screen.getByText ('終了を確認してください．')).toBeInTheDocument ()
+    expect (screen.getAllByText ('日時を確認してください．')).toHaveLength (1)
   })
 })

frontend/src/pages/posts/PostNewPage.tsx

@@ -2,19 +2,20 @@ import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useNavigate } from 'react-router-dom'
 
-import PostFormTagsArea from '@/components/PostFormTagsArea'
 import PostOriginalCreatedTimeField from '@/components/PostOriginalCreatedTimeField'
 import FieldError from '@/components/common/FieldError'
 import Form from '@/components/common/Form'
-import FormField from '@/components/common/FormField'
 import PageTitle from '@/components/common/PageTitle'
 import MainArea from '@/components/layout/MainArea'
+import PostDurationField from '@/components/posts/PostDurationField'
+import PostTagsField from '@/components/posts/PostTagsField'
+import PostTextField from '@/components/posts/PostTextField'
+import PostThumbnailPreview from '@/components/posts/PostThumbnailPreview'
 import { Button } from '@/components/ui/button'
 import { toast } from '@/components/ui/use-toast'
 import { SITE_TITLE } from '@/config'
 import { apiGet, apiPost } from '@/lib/api'
 import { canEditContent } from '@/lib/users'
-import { inputClass } from '@/lib/utils'
 import { useValidationErrors } from '@/lib/useValidationErrors'
 import Forbidden from '@/pages/Forbidden'
 
@@ -26,7 +27,11 @@ type Props = { user: User | null }
 
 type PostFormField =
     'url' | 'title' | 'tags' | 'parentPostIds'
-    | 'videoMs' | 'originalCreatedAt' | 'thumbnail'
+    | 'videoMs' | 'originalCreatedAt' | 'originalCreatedFrom'
+    | 'originalCreatedBefore' | 'thumbnail'
+
+const groupedMessages = (...values: (string[] | undefined)[]): string[] =>
+    [...new Set (values.flatMap (value => value ?? []))]
 
 
 const PostNewPage: FC<Props> = ({ user }) => {
@@ -138,30 +143,22 @@ const PostNewPage: FC<Props> = ({ user }) => {
 	  <PageTitle>広場に投稿を追加する</PageTitle>
 	  <FieldError messages={baseErrors}/>
 
-	  {/* URL */}
-	  <FormField label="URL" messages={fieldErrors.url}>
-	    {({ describedBy, invalid }) => (
-		<input type="url"
-		       placeholder="例：https://www.nicovideo.jp/watch/..."
-		       value={url}
-		       onChange={e => setURL (e.target.value)}
-		       aria-describedby={describedBy}
-		       aria-invalid={invalid}
-		       className={inputClass (invalid)}/>)}
-	  </FormField>
+	  <PostTextField
+	      label="URL"
+	      type="url"
+	      value={url}
+	      errors={fieldErrors.url}
+	      placeholder="例：https://www.nicovideo.jp/watch/..."
+	      onChange={setURL}/>
 
-	  {/* タイトル */}
-	  <FormField label="タイトル" messages={fieldErrors.title}>
-	    {({ describedBy, invalid }) => (
-		<div className="space-y-2">
-		  <input type="text"
-			 aria-describedby={describedBy}
-			 aria-invalid={invalid}
-			 className={inputClass (invalid)}
-			 value={title}
-			 placeholder={titleLoading ? 'Loading...' : ''}
-			 onChange={ev => setTitle (ev.target.value)}
-			 disabled={titleLoading}/>
+	  <PostTextField
+	      label="タイトル"
+	      value={title}
+	      errors={fieldErrors.title}
+	      disabled={titleLoading}
+	      placeholder={titleLoading ? 'Loading...' : undefined}
+	      onChange={setTitle}
+	      after={
 		  <div className="flex flex-wrap items-center gap-2 text-sm">
 		    <span>必要なタイミングで URL から取得できます．</span>
 		    <Button
@@ -171,59 +168,51 @@ const PostNewPage: FC<Props> = ({ user }) => {
 			disabled={!(url) || titleLoading}>
 		      取得
 		    </Button>
-		  </div>
-		</div>)}
-	  </FormField>
+		  </div>}/>
 
-	  {/* サムネール */}
-	  <FormField label="サムネール" messages={fieldErrors.thumbnail}>
-	    {({ describedBy, invalid }) => (
-		<>
-		  <div className="mb-2 flex flex-wrap items-center gap-2 text-sm">
-		    <span>必要なタイミングで URL から取得できます．</span>
-		    <Button
-			type="button"
-			variant="outline"
-			onClick={() => void fetchThumbnail ()}
-			disabled={!(url) || thumbnailLoading}>
-		      取得
-		    </Button>
-		  </div>
-		  {thumbnailLoading && (
-		      <p className="text-gray-500 text-sm">Loading...</p>)}
-		  <input type="file"
-			 accept="image/*"
-			 aria-describedby={describedBy}
-			 aria-invalid={invalid}
-			 onChange={e => {
-			   const file = e.target.files?.[0]
-			   if (file)
-			     {
-			       setThumbnailFile (file)
-			       setThumbnailPreview (URL.createObjectURL (file))
-			     }
-			 }}/>
-		  {thumbnailPreview && (
-		      <img src={thumbnailPreview}
-			   alt="preview"
-			   className="mt-2 max-h-48 rounded border"/>)}
-		</>)}
-	  </FormField>
+	  <div className="space-y-2">
+	    <div className="flex flex-wrap items-center gap-2 text-sm">
+	      <span>必要なタイミングで URL から取得できます．</span>
+	      <Button
+		  type="button"
+		  variant="outline"
+		  onClick={() => void fetchThumbnail ()}
+		  disabled={!(url) || thumbnailLoading}>
+		取得
+	      </Button>
+	    </div>
+	    {thumbnailLoading && (
+		<p className="text-gray-500 text-sm">Loading...</p>)}
+	    <PostTextField
+		label="サムネール"
+		value={thumbnailFile?.name ?? ''}
+		errors={fieldErrors.thumbnail}
+		disabled
+		onChange={() => {}}/>
+	    <input
+		type="file"
+		accept="image/*"
+		onChange={e => {
+		  const file = e.target.files?.[0]
+		  if (file)
+		    {
+		      setThumbnailFile (file)
+		      setThumbnailPreview (URL.createObjectURL (file))
+		    }
+		}}/>
+	    <PostThumbnailPreview
+		url={thumbnailPreview}
+		alt="preview"
+		className="h-28 w-28"/>
+	  </div>
 
-	  {/* 親投稿 */}
-	  <FormField label="親投稿" messages={fieldErrors.parentPostIds}>
-	    {({ describedBy, invalid }) => (
-		<input
-		    type="text"
-		    value={parentPostIds}
-		    onChange={e => setParentPostIds (e.target.value)}
-		    aria-describedby={describedBy}
-		    aria-invalid={invalid}
-		    className={inputClass (invalid)}/>)}
-	  </FormField>
+	  <PostTextField
+	      label="親投稿"
+	      value={parentPostIds}
+	      errors={fieldErrors.parentPostIds}
+	      onChange={setParentPostIds}/>
 
-	  {/* タグ */}
-	  <PostFormTagsArea tags={tags} setTags={setTags} errors={fieldErrors.tags}/>
+	  <PostTagsField tags={tags} setTags={setTags} errors={fieldErrors.tags}/>
 
 	  {/* オリジナルの作成日時 */}
 	  <PostOriginalCreatedTimeField
@@ -231,21 +220,16 @@ const PostNewPage: FC<Props> = ({ user }) => {
 	      setOriginalCreatedFrom={setOriginalCreatedFrom}
 	      originalCreatedBefore={originalCreatedBefore}
 	      setOriginalCreatedBefore={setOriginalCreatedBefore}
-	      errors={fieldErrors.originalCreatedAt}/>
+	      errors={groupedMessages (
+		  fieldErrors.originalCreatedAt,
+		  fieldErrors.originalCreatedFrom,
+		  fieldErrors.originalCreatedBefore)}/>
 
-	  {/* 動画時間 */}
-	  {(videoFlg &&
-	      <FormField label="動画時間" messages={fieldErrors.videoMs}>
-		{({ invalid }) => (
-		    <input
-			type="number"
-			min="0.001"
-			step="0.001"
-			value={duration}
-			onChange={e => setDuration (e.target.value)}
-			aria-invalid={invalid}
-			className={inputClass (invalid)}/>)}
-	      </FormField>)}
+	  {videoFlg && (
+	      <PostDurationField
+		  value={duration}
+		  errors={fieldErrors.videoMs}
+		  onChange={setDuration}/>)}
 
 	  {/* 送信 */}
 	  <Button onClick={handleSubmit}

frontend/src/test/postImportFactories.ts

@@ -40,6 +40,7 @@ export const buildPostImportRow = (
     provenance,
     tagSources,
     status: overrides.status ?? 'ready',
+    recoverable: overrides.recoverable,
     resetSnapshot: overrides.resetSnapshot ?? {
 	url,
 	attributes: { ...attributes },