Merge remote-tracking branch 'origin/main' into feature/206

#206 エラー修正

#206 updated_at の並び順修正

Merge remote-tracking branch 'origin/main' into feature/206

Merge branch 'main' into feature/206

Merge branch 'main' into feature/206

Merge branch 'main' into feature/206

#206

#206

#206

#206

#206

#206 タグ補完追加

#206

#206

#206

#206

#206

Merge remote-tracking branch 'origin/main' into feature/206

#206

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #274

backend/app/controllers/deerjikists_controller.rb

@@ -0,0 +1,47 @@
+class DeerjikistsController < ApplicationController
+  def show
+    platform = params[:platform].to_s.strip
+    code = params[:code].to_s.strip
+    return head :bad_request if platform.blank? || code.blank?
+
+    deerjikist = Deerjikist
+                 .joins(:tag)
+                 .includes(tag: :tag_name)
+                 .find_by(platform:, code:)
+    if deerjikist
+      render json: DeerjikistRepr.base(deerjikist)
+    else
+      head :not_found
+    end
+  end
+
+  def update
+    return head :unauthorized unless current_user
+    return head :forbidden unless current_user.gte_member?
+
+    platform = params[:platform].to_s.strip
+    code = params[:code].to_s.strip
+    tag_id = params[:tag_id].to_i
+    return head :bad_request if platform.blank? || code.blank? || tag_id <= 0
+
+    deerjikist = Deerjikist.find_or_initialize_by(platform:, code:).tap do |d|
+      d.tag_id = tag_id
+      d.save!
+    end
+
+    render json: DeerjikistRepr.base(deerjikist)
+  end
+
+  def destroy
+    return head :unauthorized unless current_user
+    return head :forbidden unless current_user.gte_member?
+
+    platform = params[:platform].to_s.strip
+    code = params[:code].to_s.strip
+    return head :bad_request if platform.blank? || code.blank?
+
+    Deerjikist.find([platform, code]).destroy!
+
+    head :no_content
+  end
+end

backend/app/controllers/nico_tags_controller.rb

@@ -1,6 +1,4 @@
 class NicoTagsController < ApplicationController
-  TAG_JSON = { only: [:id, :category, :post_count], methods: [:name, :has_wiki] }.freeze
-
   def index
     limit = (params[:limit] || 20).to_i
     cursor = params[:cursor].presence
@@ -19,15 +17,15 @@ class NicoTagsController < ApplicationController
     end
 
     render json: { tags: tags.map { |tag|
-      tag.as_json(TAG_JSON).merge(linked_tags: tag.linked_tags.map { |lt|
-        lt.as_json(TAG_JSON)
+      TagRepr.base(tag).merge(linked_tags: tag.linked_tags.map { |lt|
+        TagRepr.base(lt)
       })
     }, next_cursor: }
   end
 
   def update
     return head :unauthorized unless current_user
-    return head :forbidden unless current_user.member?
+    return head :forbidden unless current_user.gte_member?
 
     id = params[:id].to_i
 
@@ -41,6 +39,6 @@ class NicoTagsController < ApplicationController
     tag.linked_tags = linked_tags
     tag.save!
 
-    render json: tag.linked_tags.map { |t| t.as_json(TAG_JSON) }, status: :ok
+    render json: tag.linked_tags.map { |t| TagRepr.base(t) }, status: :ok
   end
 end

backend/app/controllers/posts_controller.rb

@@ -2,42 +2,88 @@ class PostsController < ApplicationController
   Event = Struct.new(:post, :tag, :user, :change_type, :timestamp, keyword_init: true)
 
   def index
+    url = params[:url].presence
+    title = params[:title].presence
+    original_created_from = params[:original_created_from].presence
+    original_created_to = params[:original_created_to].presence
+    created_between = params[:created_from].presence, params[:created_to].presence
+    updated_between = params[:updated_from].presence, params[:updated_to].presence
+
+    order = params[:order].to_s.split(':', 2).map(&:strip)
+    unless order[0].in?(['title', 'url', 'original_created_at', 'created_at', 'updated_at'])
+      order[0] = 'original_created_at'
+    end
+    unless order[1].in?(['asc', 'desc'])
+      order[1] =
+          if order[0].in?(['title', 'url'])
+            'asc'
+          else
+            'desc'
+          end
+    end
+
     page = (params[:page].presence || 1).to_i
     limit = (params[:limit].presence || 20).to_i
-    cursor = params[:cursor].presence
 
     page = 1 if page < 1
     limit = 1 if limit < 1
 
     offset = (page - 1) * limit
 
-    sort_sql =
-        'COALESCE(posts.original_created_before - INTERVAL 1 SECOND,' +
-        'posts.original_created_from,' +
-        'posts.created_at)'
+    pt_max_sql =
+        PostTag
+        .select('post_id, MAX(updated_at) AS max_updated_at')
+        .group('post_id')
+        .to_sql
+
+    updated_at_all_sql =
+        'GREATEST(posts.updated_at,' +
+        'COALESCE(pt_max.max_updated_at, posts.updated_at))'
+
     q =
         filtered_posts
+        .joins("LEFT JOIN (#{ pt_max_sql }) pt_max ON pt_max.post_id = posts.id")
+        .reselect('posts.*', Arel.sql("#{ updated_at_all_sql } AS updated_at_all"))
         .preload(tags: { tag_name: :wiki_page })
         .with_attached_thumbnail
-        .select("posts.*, #{ sort_sql } AS sort_ts")
-        .order(Arel.sql("#{ sort_sql } DESC"))
-    posts =
-        if cursor
-          q.where("#{ sort_sql } < ?", Time.iso8601(cursor)).limit(limit + 1)
-        else
-          q.limit(limit).offset(offset)
-        end
-        .to_a
 
-    next_cursor = nil
-    if cursor && posts.length > limit
-      next_cursor = posts.last.read_attribute('sort_ts').iso8601(6)
-      posts = posts.first(limit)
+    q = q.where('posts.url LIKE ?', "%#{ url }%") if url
+    q = q.where('posts.title LIKE ?', "%#{ title }%") if title
+    if original_created_from
+      q = q.where('posts.original_created_before > ?', original_created_from)
+    end
+    if original_created_to
+      q = q.where('posts.original_created_from <= ?', original_created_to)
+    end
+    q = q.where('posts.created_at >= ?', created_between[0]) if created_between[0]
+    q = q.where('posts.created_at <= ?', created_between[1]) if created_between[1]
+    if updated_between[0]
+      q = q.where("#{ updated_at_all_sql } >= ?", updated_between[0])
+    end
+    if updated_between[1]
+      q = q.where("#{ updated_at_all_sql } <= ?", updated_between[1])
     end
 
+    sort_sql =
+        case order[0]
+        when 'original_created_at'
+          'COALESCE(posts.original_created_before - INTERVAL 1 MINUTE,' +
+          'posts.original_created_from,' +
+          'posts.created_at) '
+        when 'updated_at'
+          updated_at_all_sql
+        else
+          "posts.#{ order[0] }"
+        end
+    posts = q.order(Arel.sql("#{ sort_sql } #{ order[1] }, id #{ order[1] }"))
+             .limit(limit)
+             .offset(offset)
+             .to_a
+
+    q = q.except(:select, :order)
+
     render json: { posts: posts.map { |post|
-      post.as_json(include: { tags: { only: [:id, :category, :post_count],
-                                      methods: [:name, :has_wiki] } }).tap do |json|
+      PostRepr.base(post).merge(updated_at: post.updated_at_all).tap do |json|
         json['thumbnail'] =
             if post.thumbnail.attached?
               rails_storage_proxy_url(post.thumbnail, only_path: false)
@@ -45,11 +91,7 @@ class PostsController < ApplicationController
               nil
             end
       end
-    }, count: if filtered_posts.group_values.present?
-      filtered_posts.count.size
-    else
-      filtered_posts.count
-    end, next_cursor: }
+    }, count: q.group_values.present? ? q.count.size : q.count }
   end
 
   def random
@@ -60,14 +102,11 @@ class PostsController < ApplicationController
 
     viewed = current_user&.viewed?(post) || false
 
-    render json: (post
-                  .as_json(include: { tags: { only: [:id, :category, :post_count],
-                                              methods: [:name, :has_wiki] } })
-                  .merge(viewed:))
+    render json: PostRepr.base(post).merge(viewed:)
   end
 
   def show
-    post = Post.includes(tags: { tag_name: :wiki_page }).find(params[:id])
+    post = Post.includes(tags: { tag_name: :wiki_page }).find_by(id: params[:id])
     return head :not_found unless post
 
     viewed = current_user&.viewed?(post) || false
@@ -82,13 +121,13 @@ class PostsController < ApplicationController
 
   def create
     return head :unauthorized unless current_user
-    return head :forbidden unless current_user.member?
+    return head :forbidden unless current_user.gte_member?
 
     # TODO: サイトに応じて thumbnail_base 設定
     title = params[:title].presence
     url = params[:url]
     thumbnail = params[:thumbnail]
-    tag_names = params[:tags].to_s.split(' ')
+    tag_names = params[:tags].to_s.split
     original_created_from = params[:original_created_from]
     original_created_before = params[:original_created_before]
 
@@ -102,9 +141,7 @@ class PostsController < ApplicationController
       sync_post_tags!(post, tags)
 
       post.reload
-      render json: post.as_json(include: { tags: { only: [:id, :category, :post_count],
-                                                   methods: [:name, :has_wiki] } }),
-             status: :created
+      render json: PostRepr.base(post), status: :created
     else
       render json: { errors: post.errors.full_messages }, status: :unprocessable_entity
     end
@@ -128,10 +165,10 @@ class PostsController < ApplicationController
 
   def update
     return head :unauthorized unless current_user
-    return head :forbidden unless current_user.member?
+    return head :forbidden unless current_user.gte_member?
 
     title = params[:title].presence
-    tag_names = params[:tags].to_s.split(' ')
+    tag_names = params[:tags].to_s.split
     original_created_from = params[:original_created_from]
     original_created_before = params[:original_created_before]
 
@@ -170,7 +207,7 @@ class PostsController < ApplicationController
 
     events = []
     pts.each do |pt|
-      tag = pt.tag.as_json(only: [:id, :category], methods: [:name, :has_wiki])
+      tag = TagRepr.base(pt.tag)
       post = pt.post
 
       events << Event.new(
@@ -198,7 +235,7 @@ class PostsController < ApplicationController
   private
 
   def filtered_posts
-    tag_names = params[:tags].to_s.split(' ')
+    tag_names = params[:tags].to_s.split
     match_type = params[:match]
     if tag_names.present?
       filter_posts_by_tags(tag_names, match_type)
@@ -269,8 +306,7 @@ class PostsController < ApplicationController
       return nil unless tag
 
       if path.include?(tag_id)
-        return tag.as_json(only: [:id, :category, :post_count],
-                           methods: [:name, :has_wiki]).merge(children: [])
+        return TagRepr.base(tag).merge(children: [])
       end
 
       if memo.key?(tag_id)
@@ -282,8 +318,7 @@ class PostsController < ApplicationController
 
       children = child_ids.filter_map { |cid| build_node.(cid, new_path) }
 
-      memo[tag_id] = tag.as_json(only: [:id, :category, :post_count],
-                                 methods: [:name, :has_wiki]).merge(children:)
+      memo[tag_id] = TagRepr.base(tag).merge(children:)
     end
 
     root_ids.filter_map { |id| build_node.call(id, []) }

backend/app/controllers/tags_controller.rb

@@ -13,7 +13,7 @@ class TagsController < ApplicationController
       tags = tags.where(posts: { id: post_id })
     end
 
-    render json: tags.as_json(only: [:id, :category, :post_count], methods: [:name, :has_wiki])
+    render json: TagRepr.base(tags)
   end
 
   def autocomplete
@@ -57,8 +57,7 @@ class TagsController < ApplicationController
     tags = tags.order(Arel.sql('post_count DESC, tag_names.name')).limit(20).to_a
 
     render json: tags.map { |tag|
-      tag.as_json(only: [:id, :category, :post_count], methods: [:name, :has_wiki])
-          .merge(matched_alias: matched_alias_by_tag_name_id[tag.tag_name_id])
+      TagRepr.base(tag).merge(matched_alias: matched_alias_by_tag_name_id[tag.tag_name_id])
     }
   end
 
@@ -67,7 +66,7 @@ class TagsController < ApplicationController
              .includes(:tag_name, tag_name: :wiki_page)
              .find_by(id: params[:id])
     if tag
-      render json: tag.as_json(only: [:id, :category, :post_count], methods: [:name, :has_wiki])
+      render json: TagRepr.base(tag)
     else
       head :not_found
     end
@@ -81,15 +80,36 @@ class TagsController < ApplicationController
              .includes(:tag_name, tag_name: :wiki_page)
              .find_by(tag_names: { name: })
     if tag
-      render json: tag.as_json(only: [:id, :category, :post_count], methods: [:name, :has_wiki])
+      render json: TagRepr.base(tag)
     else
       head :not_found
     end
   end
 
+  def deerjikists
+    tag = Tag.joins(:tag_name)
+             .includes(:tag_name, tag_name: :wiki_page)
+             .find_by(id: params[:id])
+    return head :not_found unless tag
+
+    render json: DeerjikistRepr.many(tag.deerjikists)
+  end
+
+  def deerjikists_by_name
+    name = params[:name].to_s.strip
+    return head :bad_request if name.blank?
+
+    tag = Tag.joins(:tag_name)
+             .includes(:tag_name, tag_name: :wiki_page)
+             .find_by(tag_names: { name: })
+    return head :not_found unless tag
+
+    render json: DeerjikistRepr.many(tag.deerjikists)
+  end
+
   def update
     return head :unauthorized unless current_user
-    return head :forbidden unless current_user.member?
+    return head :forbidden unless current_user.gte_member?
 
     name = params[:name].presence
     category = params[:category].presence
@@ -104,6 +124,6 @@ class TagsController < ApplicationController
       tag.update!(category:)
     end
 
-    render json: tag.as_json(methods: [:name])
+    render json: TagRepr.base(tag)
   end
 end

backend/app/controllers/wiki_pages_controller.rb

@@ -4,14 +4,12 @@ class WikiPagesController < ApplicationController
   def index
     title = params[:title].to_s.strip
     if title.blank?
-      return render json: WikiPage.joins(:tag_name)
-                                  .includes(:tag_name)
-                                  .as_json(methods: [:title])
+      return render json: WikiPageRepr.base(WikiPage.joins(:tag_name).includes(:tag_name))
     end
 
     q = WikiPage.joins(:tag_name).includes(:tag_name)
         .where('tag_names.name LIKE ?', "%#{ WikiPage.sanitize_sql_like(title) }%")
-    render json: q.limit(20).as_json(methods: [:title])
+    render json: WikiPageRepr.base(q.limit(20))
   end
 
   def show
@@ -85,20 +83,20 @@ class WikiPagesController < ApplicationController
 
   def create
     return head :unauthorized unless current_user
-    return head :forbidden unless current_user.member?
+    return head :forbidden unless current_user.gte_member?
 
-    title = params[:title]&.strip
+    name = params[:title]&.strip
     body = params[:body].to_s
 
-    return head :unprocessable_entity if title.blank? || body.blank?
-
-    page = WikiPage.new(title:, created_user: current_user, updated_user: current_user)
+    return head :unprocessable_entity if name.blank? || body.blank?
 
+    tag_name = TagName.find_or_create_by!(name:)
+    page = WikiPage.new(tag_name:, created_user: current_user, updated_user: current_user)
     if page.save
       message = params[:message].presence
       Wiki::Commit.content!(page:, body:, created_user: current_user, message:)
 
-      render json: page.as_json(methods: [:title]), status: :created
+      render json: WikiPageRepr.base(page), status: :created
     else
       render json: { errors: page.errors.full_messages },
              status: :unprocessable_entity
@@ -107,7 +105,7 @@ class WikiPagesController < ApplicationController
 
   def update
     return head :unauthorized unless current_user
-    return head :forbidden unless current_user.member?
+    return head :forbidden unless current_user.gte_member?
 
     title = params[:title]&.strip
     body = params[:body].to_s
@@ -174,8 +172,7 @@ class WikiPagesController < ApplicationController
     succ = page.succ_revision_id(revision_id)
     updated_at = rev.created_at
 
-    render json: page.as_json(methods: [:title])
-                     .merge(body:, revision_id:, pred:, succ:, updated_at:)
+    render json: WikiPageRepr.base(page).merge(body:, revision_id:, pred:, succ:, updated_at:)
   end
 
   def find_revision page

backend/app/models/deerjikist.rb

@@ -0,0 +1,21 @@
+class Deerjikist < ApplicationRecord
+  self.primary_key = :platform, :code
+
+  belongs_to :tag
+
+  validates :platform, presence: true
+  validates :code, presence: true
+  validates :tag_id, presence: true
+
+  validate :tag_must_be_deerjikist
+
+  enum :platform, nico: 'nico', youtube: 'youtube'
+
+  private
+
+  def tag_must_be_deerjikist
+    if tag && !(tag.deerjikist?)
+      errors.add :tag, 'タグはニジラー・カテゴリである必要があります．'
+    end
+  end
+end

backend/app/models/tag.rb

@@ -23,6 +23,10 @@ class Tag < ApplicationRecord
   has_many :parents, through: :reversed_tag_implications, source: :parent_tag
 
   has_many :tag_similarities, dependent: :delete_all
+  has_many :tag_similarities_as_target,
+           class_name: 'TagSimilarity', foreign_key: :target_tag_id, dependent: :delete_all
+
+  has_many :deerjikists, dependent: :delete_all
 
   belongs_to :tag_name
   delegate :wiki_page, to: :tag_name
@@ -42,24 +46,27 @@ class Tag < ApplicationRecord
 
   validate :nico_tag_name_must_start_with_nico
   validate :tag_name_must_be_canonical
+  validate :category_must_be_deerjikist_with_deerjikists
 
-  scope :nico_tags, -> { where(category: :nico) }
+  scope :nico_tags, -> { nico }
 
   CATEGORY_PREFIXES = {
-      'gen:'  => :general,
-      'djk:'  => :deerjikist,
-      'meme:' => :meme,
-      'chr:'  => :character,
-      'mtr:'  => :material,
-      'meta:' => :meta }.freeze
+      'general:'    => :general,
+      'gen:'        => :general,
+      'deerjikist:' => :deerjikist,
+      'djk:'        => :deerjikist,
+      'meme:'       => :meme,
+      'character:'  => :character,
+      'chr:'        => :character,
+      'material:'   => :material,
+      'mtr:'        => :material,
+      'meta:'       => :meta }.freeze
 
   def name= val
     (self.tag_name ||= build_tag_name).name = val
   end
 
-  def has_wiki
-    wiki_page.present?
-  end
+  def has_wiki = wiki_page.present?
 
   def self.tagme
     @tagme ||= find_or_create_by_tag_name!('タグ希望', category: :meta)
@@ -69,6 +76,10 @@ class Tag < ApplicationRecord
     @bot ||= find_or_create_by_tag_name!('bot操作', category: :meta)
   end
 
+  def self.no_deerjikist
+    @no_deerjikist ||= find_or_create_by_tag_name!('ニジラー情報不詳', category: :meta)
+  end
+
   def self.video
     @video ||= find_or_create_by_tag_name!('動画', category: :meta)
   end
@@ -78,21 +89,20 @@ class Tag < ApplicationRecord
   end
 
   def self.normalise_tags tag_names, with_tagme: true, deny_nico: true
-    if deny_nico && tag_names.any? { |n| n.start_with?('nico:') }
+    if deny_nico && tag_names.any? { |n| n.downcase.start_with?('nico:') }
       raise NicoTagNormalisationError
     end
 
     tags = tag_names.map do |name|
-      pf, cat = CATEGORY_PREFIXES.find { |p, _| name.start_with?(p) } || ['', nil]
-      name = TagName.canonicalise(name.delete_prefix(pf)).first
+      pf, cat = CATEGORY_PREFIXES.find { |p, _| name.downcase.start_with?(p) } || ['', nil]
+      name = TagName.canonicalise(name.sub(/\A#{ pf }/i, '')).first
       find_or_create_by_tag_name!(name, category: (cat || :general)).tap do |tag|
-        if cat && tag.category != cat
-          tag.update!(category: cat)
-        end
+        tag.update!(category: cat) if cat && tag.category != cat
       end
     end
 
     tags << Tag.tagme if with_tagme && tags.size < 10 && tags.none?(Tag.tagme)
+    tags << Tag.no_deerjikist if tags.all? { |t| !(t.deerjikist?) }
     tags.uniq(&:id)
   end
 
@@ -130,12 +140,44 @@ class Tag < ApplicationRecord
     retry
   end
 
+  def self.merge_tags! target_tag, source_tags
+    target_tag => Tag
+
+    Tag.transaction do
+      Array(source_tags).compact.uniq.each do |st|
+        st => Tag
+
+        next if st == target_tag
+
+        st.post_tags.find_each do |pt|
+          if PostTag.kept.exists?(post_id: pt.post_id, tag_id: target_tag.id)
+            pt.discard_by!(nil)
+            # discard 後の update! は禁止なので DB を直に更新
+            pt.update_columns(tag_id: target_tag.id, updated_at: Time.current)
+          else
+            pt.update!(tag: target_tag)
+          end
+        end
+
+        tag_name = st.tag_name
+        st.destroy!
+        tag_name.reload
+        tag_name.update!(canonical: target_tag.tag_name)
+      end
+
+      # 投稿件数を再集計
+      target_tag.update_columns(post_count: PostTag.kept.where(tag: target_tag).count)
+    end
+
+    target_tag.reload
+  end
+
   private
 
   def nico_tag_name_must_start_with_nico
     n = name.to_s
-    if ((category == 'nico' && !(n.start_with?('nico:'))) || 
-        (category != 'nico' && n.start_with?('nico:')))
+    if ((nico? && !(n.downcase.start_with?('nico:'))) || 
+        (!(nico?) && n.downcase.start_with?('nico:')))
       errors.add :name, 'ニコニコ・タグの命名規則に反してゐます．'
     end
   end
@@ -145,4 +187,10 @@ class Tag < ApplicationRecord
       errors.add :tag_name, 'tag_names へは実体を示す必要があります．'
     end
   end
+
+  def category_must_be_deerjikist_with_deerjikists
+    if !(deerjikist?) && deerjikists.exists?
+      errors.add :category, 'ニジラーと紐づいてゐるタグはニジラー・カテゴリである必要があります．'
+    end
+  end
 end

backend/app/models/user.rb

@@ -1,29 +1,23 @@
 class User < ApplicationRecord
-  enum :role, { guest: 'guest', member: 'member', admin: 'admin' }
+  enum :role, guest: 'guest', member: 'member', admin: 'admin'
 
   validates :name, length: { maximum: 255 }
   validates :inheritance_code, presence: true, length: { maximum: 64 }
   validates :role, presence: true, inclusion: { in: roles.keys }
   validates :banned, inclusion: { in: [true, false] }
 
-  has_many :posts
+  has_many :created_posts,
+           class_name: 'Post', foreign_key: :uploaded_user_id, dependent: :nullify
   has_many :settings
   has_many :user_ips, dependent: :destroy
   has_many :ip_addresses, through: :user_ips
   has_many :user_post_views, dependent: :destroy
   has_many :viewed_posts, through: :user_post_views, source: :post
-  has_many :created_wiki_pages, class_name: 'WikiPage', foreign_key: 'created_user_id', dependent: :nullify
-  has_many :updated_wiki_pages, class_name: 'WikiPage', foreign_key: 'updated_user_id', dependent: :nullify
+  has_many :created_wiki_pages,
+           class_name: 'WikiPage', foreign_key: :created_user_id, dependent: :nullify
+  has_many :updated_wiki_pages,
+           class_name: 'WikiPage', foreign_key: :updated_user_id, dependent: :nullify
 
-  def viewed? post
-    user_post_views.exists? post_id: post.id
-  end
-
-  def member?
-    ['member', 'admin'].include?(role)
-  end
-
-  def admin?
-    role == 'admin'
-  end
+  def viewed?(post) = user_post_views.exists?(post_id: post.id)
+  def gte_member? = member? || admin?
 end

backend/app/models/wiki_line.rb

@@ -8,7 +8,7 @@ class WikiLine < ApplicationRecord
     sha = Digest::SHA256.hexdigest(body)
     now = Time.current
 
-    upsert({ sha256: sha, body:, created_at: now, updated_at: now })
+    upsert(sha256: sha, body:, created_at: now, updated_at: now)
 
     find_by!(sha256: sha)
   end

backend/app/models/wiki_page.rb

@@ -14,17 +14,13 @@ class WikiPage < ApplicationRecord
   belongs_to :tag_name
   validates :tag_name, presence: true
 
-  def title
-    tag_name.name
-  end
+  def title = tag_name.name
 
   def title= val
     (self.tag_name ||= build_tag_name).name = val
   end
 
-  def current_revision
-    wiki_revisions.order(id: :desc).first
-  end
+  def current_revision = wiki_revisions.order(id: :desc).first
 
   def body
     rev = current_revision
@@ -49,11 +45,8 @@ class WikiPage < ApplicationRecord
     page
   end
 
-  def pred_revision_id revision_id
-    wiki_revisions.where('id < ?', revision_id).order(id: :desc).limit(1).pick(:id)
-  end
-
-  def succ_revision_id revision_id
-    wiki_revisions.where('id > ?', revision_id).order(id: :asc).limit(1).pick(:id)
-  end
+  def pred_revision_id(revision_id) =
+      wiki_revisions.where('id < ?', revision_id).order(id: :desc).limit(1).pick(:id)
+  def succ_revision_id(revision_id) =
+      wiki_revisions.where('id > ?', revision_id).order(id: :asc).limit(1).pick(:id)
 end

backend/app/models/wiki_revision.rb

@@ -7,7 +7,7 @@ class WikiRevision < ApplicationRecord
   has_many :wiki_revision_lines, dependent: :delete_all
   has_many :wiki_lines, through: :wiki_revision_lines
 
-  enum :kind, { content: 0, redirect: 1 }
+  enum :kind, content: 0, redirect: 1
 
   validates :kind, presence: true
   validates :lines_count, numericality: { only_integer: true, greater_than_or_equal_to: 0 }

backend/app/representations/deerjikist_repr.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+
+module DeerjikistRepr
+  BASE = { only: [:platform, :code], include: { tag: TagRepr::BASE } }.freeze
+
+  module_function
+
+  def base deerjikist
+    deerjikist.as_json(BASE)
+  end
+
+  def many deerjikists
+    deerjikists.map { |d| base(d) }
+  end
+end

backend/app/representations/post_repr.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+
+module PostRepr
+  BASE = { include: { tags: TagRepr::BASE } }.freeze
+
+  module_function
+
+  def base post
+    post.as_json(BASE)
+  end
+
+  def many posts
+    posts.map { |p| base(p) }
+  end
+end

backend/app/representations/tag_repr.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+
+module TagRepr
+  BASE = { only: [:id, :category, :post_count], methods: [:name, :has_wiki] }.freeze
+
+  module_function
+
+  def base tag
+    tag.as_json(BASE)
+  end
+
+  def many tags
+    tags.map { |t| base(t) }
+  end
+end

backend/app/representations/wiki_page_repr.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+
+module WikiPageRepr
+  BASE = { methods: [:title] }.freeze
+
+  module_function
+
+  def base wiki_page
+    wiki_page.as_json(BASE)
+  end
+
+  def many wiki_pages
+    wiki_pages.map { |p| base(p) }
+  end
+end

backend/config/routes.rb

@@ -9,7 +9,15 @@ Rails.application.routes.draw do
   resources :tags, only: [:index, :show, :update] do
     collection do
       get :autocomplete
-      get 'name/:name', action: :show_by_name
+
+      scope :name do
+        get ':name/deerjikists', action: :deerjikists_by_name
+        get ':name', action: :show_by_name
+      end
+    end
+
+    member do
+      get :deerjikists
     end
   end
 
@@ -54,4 +62,14 @@ Rails.application.routes.draw do
       post 'code/renew', action: :renew
     end
   end
+
+  resources :deerjikists, only: [] do
+    collection do
+      scope ':platform/:code' do
+        get '', action: :show
+        put '', action: :update
+        delete '', action: :destroy
+      end
+    end
+  end
 end

backend/db/migrate/20260303122700_create_deerjikists.rb

@@ -0,0 +1,10 @@
+class CreateDeerjikists < ActiveRecord::Migration[8.0]
+  def change
+    create_table :deerjikists, primary_key: [:platform, :code] do |t|
+      t.string :platform, null: false, limit: 16
+      t.string :code, null: false
+      t.references :tag, null: false
+      t.timestamps
+    end
+  end
+end

backend/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2026_01_27_005300) do
+ActiveRecord::Schema[8.0].define(version: 2026_03_03_122700) do
   create_table "active_storage_attachments", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -39,6 +39,15 @@ ActiveRecord::Schema[8.0].define(version: 2026_01_27_005300) do
     t.index ["blob_id", "variation_digest"], name: "index_active_storage_variant_records_uniqueness", unique: true
   end
 
+  create_table "deerjikists", primary_key: ["platform", "code"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.string "platform", limit: 16, null: false
+    t.string "code", null: false
+    t.bigint "tag_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["tag_id"], name: "index_deerjikists_on_tag_id"
+  end
+
   create_table "ip_addresses", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.binary "ip_address", limit: 16, null: false
     t.boolean "banned", default: false, null: false

backend/lib/tasks/sync_nico.rake

@@ -2,9 +2,9 @@ namespace :nico do
   desc 'ニコニコ DB 同期'
   task sync: :environment do
     require 'json'
-    require 'open3'
-    require 'open-uri'
     require 'nokogiri'
+    require 'open-uri'
+    require 'open3'
     require 'set'
     require 'time'
 
@@ -15,12 +15,12 @@ namespace :nico do
       doc.at('meta[name="thumbnail"]')&.[]('content').presence
     end
 
-    def sync_post_tags! post, desired_tag_ids, current_ids: nil
-      current_ids ||= PostTag.kept.where(post_id: post.id).pluck(:tag_id).to_set
-      desired_ids = desired_tag_ids.compact.to_set
+    def sync_post_tags! post, desired_tag_ids, current_tag_ids: nil
+      current_tag_ids ||= PostTag.kept.where(post_id: post.id).pluck(:tag_id).to_set
+      desired_tag_ids = desired_tag_ids.compact.to_set
 
-      to_add = desired_ids - current_ids
-      to_remove = current_ids - desired_ids
+      to_add = desired_tag_ids - current_tag_ids
+      to_remove = current_tag_ids - desired_tag_ids
 
       Tag.where(id: to_add.to_a).find_each do |tag|
         begin
@@ -42,12 +42,14 @@ namespace :nico do
         { 'MYSQL_USER' => mysql_user, 'MYSQL_PASS' => mysql_pass },
         'python3', "#{ nizika_nico_path }/get_videos.py")
 
-    abort unless status.success?
+    unless status.success?
+      warn stderr
+      abort
+    end
 
     data = JSON.parse(stdout)
     data.each do |datum|
       code = datum['code']
-
       post =
           Post
           .where('url REGEXP ?', "nicovideo\\.jp/watch/#{ Regexp.escape(code) }([^0-9]|$)")
@@ -94,32 +96,50 @@ namespace :nico do
         sync_post_tags!(post, [Tag.tagme.id, Tag.bot.id, Tag.niconico.id, Tag.video.id])
       end
 
-      kept_ids = PostTag.kept.where(post_id: post.id).pluck(:tag_id).to_set
-      kept_non_nico_ids = post.tags.where.not(category: 'nico').pluck(:id).to_set
+      tags = post.tags
+      # 既存のタグ Id. 集合
+      kept_tag_ids = tags.pluck(:id).to_set
+      # うち内部タグ Id. 集合
+      kept_non_nico_tag_ids = tags.not_nico.pluck(:id).to_set
+
+      # 記載すべき外部タグ Id. および連携される内部タグ Id. のリスト
+      desired_nico_tag_based_ids = []
+      # 記載すべき内部タグ Id. のリスト
+      desired_non_nico_tag_ids = []
 
-      desired_nico_ids = []
-      desired_non_nico_ids = []
       datum['tags'].each do |raw|
         name = "nico:#{ raw }"
-        tag = Tag.find_or_create_by_tag_name!(name, category: 'nico')
-        desired_nico_ids << tag.id
-        unless tag.id.in?(kept_ids)
+        tag = Tag.find_or_create_by_tag_name!(name, category: :nico)
+        desired_nico_tag_based_ids << tag.id
+
+        # 新たに記載される外部タグと連携される内部タグを記載
+        unless tag.id.in?(kept_tag_ids)
           linked_ids = tag.linked_tags.pluck(:id)
-          desired_non_nico_ids.concat(linked_ids)
-          desired_nico_ids.concat(linked_ids)
+          desired_non_nico_tag_ids.concat(linked_ids)
+          desired_nico_tag_based_ids.concat(linked_ids)
         end
       end
-      desired_nico_ids.uniq!
 
-      desired_all_ids = kept_non_nico_ids.to_a + desired_nico_ids
-      desired_non_nico_ids.concat(kept_non_nico_ids.to_a)
-      desired_non_nico_ids.uniq!
-      if kept_non_nico_ids.to_set != desired_non_nico_ids.to_set
-        desired_all_ids << Tag.bot.id
+      deerjikist = Deerjikist.find_by(platform: :nico, code: datum['user'])
+      if deerjikist
+        desired_non_nico_tag_ids << deerjikist.tag_id
+        desired_nico_tag_based_ids << deerjikist.tag_id
+      elsif !(Tag.where(id: kept_non_nico_tag_ids).where(category: :deerjikist).exists?)
+        desired_non_nico_tag_ids << Tag.no_deerjikist.id
+        desired_nico_tag_based_ids << Tag.no_deerjikist.id
       end
-      desired_all_ids.uniq!
 
-      sync_post_tags!(post, desired_all_ids, current_ids: kept_ids)
+      desired_nico_tag_based_ids.uniq!
+
+      desired_all_tag_ids = kept_non_nico_tag_ids.to_a + desired_nico_tag_based_ids
+      desired_non_nico_tag_ids.concat(kept_non_nico_tag_ids.to_a)
+      desired_non_nico_tag_ids.uniq!
+      if kept_non_nico_tag_ids != desired_non_nico_tag_ids.to_set
+        desired_all_tag_ids << Tag.bot.id
+      end
+      desired_all_tag_ids.uniq!
+
+      sync_post_tags!(post, desired_all_tag_ids, current_tag_ids: kept_tag_ids)
     end
   end
 end

backend/spec/factories/tags.rb

@@ -1,11 +1,11 @@
 FactoryBot.define do
   factory :tag do
-    category { 'general' }
+    category { :general }
     post_count { 0 }
     association :tag_name
 
     trait :nico do
-      category { 'nico' }
+      category { :nico }
       tag_name { association(:tag_name, name: "nico:#{ SecureRandom.hex(4) }") }
     end
   end

backend/spec/models/tag_spec.rb

@@ -0,0 +1,71 @@
+require 'rails_helper'
+
+RSpec.describe Tag, type: :model do
+  describe '.merge_tags!' do
+    let!(:target_tag) { create(:tag) }
+    let!(:source_tag) { create(:tag) }
+
+    let!(:post_record) { Post.create!(url: 'https://example.com/posts/1', title: 'test post') }
+
+    context 'when merging a simple source tag' do
+      let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
+
+      it 'moves the post_tag, deletes the source tag, and aliases the source tag_name' do
+        described_class.merge_tags!(target_tag, [source_tag])
+
+        expect(source_post_tag.reload.tag_id).to eq(target_tag.id)
+        expect(Tag.exists?(source_tag.id)).to be(false)
+        expect(source_tag.tag_name.reload.canonical_id).to eq(target_tag.tag_name_id)
+      end
+    end
+
+    context 'when the target already has the same post_tag' do
+      let!(:target_post_tag) { PostTag.create!(post: post_record, tag: target_tag) }
+      let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
+
+      it 'discards the duplicate source post_tag and keeps one active target post_tag' do
+        described_class.merge_tags!(target_tag, [source_tag])
+
+        active = PostTag.kept.where(post_id: post_record.id, tag_id: target_tag.id)
+        discarded_source = PostTag.with_discarded.find(source_post_tag.id)
+
+        expect(active.count).to eq(1)
+        expect(discarded_source.discarded_at).to be_present
+        expect(Tag.exists?(source_tag.id)).to be(false)
+        expect(source_tag.tag_name.reload.canonical_id).to eq(target_tag.tag_name_id)
+      end
+    end
+
+    context 'when source_tags includes the target itself' do
+      let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
+
+      it 'ignores the target tag in source_tags' do
+        described_class.merge_tags!(target_tag, [source_tag, target_tag])
+
+        expect(Tag.exists?(target_tag.id)).to be(true)
+        expect(Tag.exists?(source_tag.id)).to be(false)
+        expect(source_post_tag.reload.tag_id).to eq(target_tag.id)
+      end
+    end
+
+    context 'when aliasing the source tag_name is invalid' do
+      let!(:source_post_tag) { PostTag.create!(post: post_record, tag: source_tag) }
+      let!(:wiki_page) do
+        WikiPage.create!(
+            tag_name: source_tag.tag_name,
+            created_user: create_admin_user!,
+            updated_user: create_admin_user!)
+      end
+
+      it 'rolls back the transaction' do
+        expect {
+          described_class.merge_tags!(target_tag, [source_tag])
+        }.to raise_error(ActiveRecord::RecordInvalid)
+
+        expect(Tag.exists?(source_tag.id)).to be(true)
+        expect(source_post_tag.reload.tag_id).to eq(source_tag.id)
+        expect(source_tag.tag_name.reload.canonical_id).to be_nil
+      end
+    end
+  end
+end

backend/spec/requests/deerjikists_spec.rb

@@ -0,0 +1,181 @@
+require 'rails_helper'
+
+RSpec.describe 'Deerjikists API', type: :request do
+  let(:platform) { 'nico' }
+  let(:code) { 'deerjika-bot' }
+
+  let!(:tag1) { create(:tag, category: :deerjikist) }
+  let!(:tag2) { create(:tag, category: :deerjikist) }
+
+  let(:member) { create(:user, :member) }
+  let(:guest) { create(:user, role: :guest) }
+
+  describe 'GET /deerjikists/:platform/:code' do
+    subject(:do_request) do
+      get "/deerjikists/#{ platform }/#{ code }"
+    end
+
+    context 'when deerjikist exists' do
+      before do
+        Deerjikist.create!(platform:, code:, tag: tag1)
+      end
+
+      it 'returns 200 and deerjikist json' do
+        do_request
+        expect(response).to have_http_status(:ok)
+
+        expect(json).to be_a(Hash)
+        expect(json['platform']).to eq(platform)
+        expect(json['code']).to eq(code)
+
+        expect(json['tag']).to be_a(Hash)
+        expect(json['tag']['id']).to eq(tag1.id)
+        expect(json['tag']['name']).to eq(tag1.name)
+      end
+    end
+
+    context 'when deerjikist does not exist' do
+      it 'returns 404' do
+        do_request
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context 'when platform or code become blank after strip' do
+      it 'returns 400' do
+        get '/deerjikists/%20/%20'
+        expect(response).to have_http_status(:bad_request)
+      end
+    end
+  end
+
+  describe 'PUT /deerjikists/:platform/:code' do
+    subject(:do_request) do
+      put "/deerjikists/#{ platform }/#{ code }", params: payload
+    end
+
+    let(:payload) { { tag_id: tag1.id } }
+
+    context 'when not legged in' do
+      it 'returns 401' do
+        sign_out
+        do_request
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+
+    context 'when logged in but not member' do
+      it 'returns 403' do
+        sign_in_as guest
+        do_request
+        expect(response).to have_http_status(:forbidden)
+      end
+    end
+
+    context 'when member' do
+      before do
+        sign_in_as member
+      end
+
+      context 'when params invalid' do
+        it 'returns 400 when tag_id is missing or invalid' do
+          put "/deerjikists/#{ platform }/#{ code }", params: { tag_id: 0 }
+          expect(response).to have_http_status(:bad_request)
+        end
+
+        it 'returns 400 when platform or code blank after strip' do
+          put '/deerjikists/%20/%20', params: { tag_id: tag1.id }
+          expect(response).to have_http_status(:bad_request)
+        end
+      end
+
+      context 'when creating new deerjikist' do
+        it 'creates and returns 200 with json' do
+          expect { do_request }.to change { Deerjikist.count }.by(1)
+          expect(response).to have_http_status(:ok)
+
+          d = Deerjikist.find_by(platform:, code:)
+          expect(d).to be_present
+          expect(d.tag_id).to eq(tag1.id)
+
+          expect(json['platform']).to eq(platform)
+          expect(json['code']).to eq(code)
+        end
+      end
+
+      context 'when updating existing deerjikist' do
+        before do
+          Deerjikist.create!(platform:, code:, tag: tag1)
+        end
+
+        let(:payload) { { tag_id: tag2.id } }
+
+        it 'updates tag_id and returns 200' do
+          expect { do_request }.not_to change { Deerjikist.count }
+          expect(response).to have_http_status(:ok)
+
+          d = Deerjikist.find_by(platform:, code:)
+          expect(d.tag_id).to eq(tag2.id)
+
+          expect(json['platform']).to eq(platform)
+          expect(json['code']).to eq(code)
+        end
+      end
+    end
+  end
+
+  describe 'DELETE /deerjikists/:platform/:code' do
+    subject(:do_request) do
+      delete "/deerjikists/#{ platform }/#{ code }"
+    end
+
+    context 'when not logged in' do
+      it 'returns 401' do
+        sign_out
+        do_request
+        expect(response).to have_http_status(:unauthorized)
+      end
+    end
+
+    context 'when logged in but not member' do
+      it 'returns 403' do
+        sign_in_as guest
+        do_request
+        expect(response).to have_http_status(:forbidden)
+      end
+    end
+
+    context 'when member' do
+      before do
+        sign_in_as member
+      end
+
+      it 'returns 400 when platform/code blank after strip' do
+        delete '/deerjikists/%20/%20'
+        expect(response).to have_http_status(:bad_request)
+      end
+
+      context 'when deerjikist exists' do
+        before do
+          Deerjikist.create!(platform: platform, code: code, tag: tag1)
+        end
+
+        it 'destroys and returns 204' do
+          expect {
+            do_request
+          }.to change { Deerjikist.exists?(platform: platform, code: code) }
+            .from(true).to(false)
+
+          expect(response).to have_http_status(:no_content)
+        end
+      end
+
+      context 'when deerjikist does not exist' do
+        it 'returns 404' do
+          do_request
+          expect(response).to have_http_status(:not_found)
+        end
+      end
+    end
+  end
+end

backend/spec/requests/posts_spec.rb

@@ -1,7 +1,8 @@
+include ActiveSupport::Testing::TimeHelpers
+
 require 'rails_helper'
 require 'set'
 
-
 RSpec.describe 'Posts API', type: :request do
   # create / update で thumbnail.attach は走るが、
   # resized_thumbnail! が MiniMagick 依存でコケやすいので request spec ではスタブしとくのが無難。
@@ -114,6 +115,204 @@ RSpec.describe 'Posts API', type: :request do
         expect(json.fetch('count')).to eq(0)
       end
     end
+
+    context 'when url is provided' do
+      let!(:url_hit_post) do
+        Post.create!(uploaded_user: user, title: 'url hit',
+                     url: 'https://example.com/needle-url-xyz').tap do |p|
+          PostTag.create!(post: p, tag:)
+        end
+      end
+
+      let!(:url_miss_post) do
+        Post.create!(uploaded_user: user, title: 'url miss',
+                     url: 'https://example.com/other-url').tap do |p|
+          PostTag.create!(post: p, tag:)
+        end
+      end
+
+      it 'filters posts by url substring' do
+        get '/posts', params: { url: 'needle-url-xyz' }
+
+        expect(response).to have_http_status(:ok)
+        ids = json.fetch('posts').map { |p| p['id'] }
+
+        expect(ids).to include(url_hit_post.id)
+        expect(ids).not_to include(url_miss_post.id)
+        expect(json.fetch('count')).to eq(1)
+      end
+    end
+
+    context 'when title is provided' do
+      let!(:title_hit_post) do
+        Post.create!(uploaded_user: user, title: 'needle-title-xyz',
+                     url: 'https://example.com/title-hit').tap do |p|
+          PostTag.create!(post: p, tag:)
+        end
+      end
+
+      let!(:title_miss_post) do
+        Post.create!(uploaded_user: user, title: 'other title',
+                     url: 'https://example.com/title-miss').tap do |p|
+          PostTag.create!(post: p, tag:)
+        end
+      end
+
+      it 'filters posts by title substring' do
+        get '/posts', params: { title: 'needle-title-xyz' }
+
+        expect(response).to have_http_status(:ok)
+        ids = json.fetch('posts').map { |p| p['id'] }
+
+        expect(ids).to include(title_hit_post.id)
+        expect(ids).not_to include(title_miss_post.id)
+        expect(json.fetch('count')).to eq(1)
+      end
+    end
+
+    context 'when created_from/created_to are provided' do
+      let(:t_created_hit) { Time.zone.local(2010, 1, 5, 12, 0, 0) }
+      let(:t_created_miss) { Time.zone.local(2012, 1, 5, 12, 0, 0) }
+
+      let!(:created_hit_post) do
+        travel_to(t_created_hit) do
+          Post.create!(uploaded_user: user, title: 'created hit',
+                       url: 'https://example.com/created-hit').tap do |p|
+            PostTag.create!(post: p, tag:)
+          end
+        end
+      end
+
+      let!(:created_miss_post) do
+        travel_to(t_created_miss) do
+          Post.create!(uploaded_user: user, title: 'created miss',
+                       url: 'https://example.com/created-miss').tap do |p|
+            PostTag.create!(post: p, tag:)
+          end
+        end
+      end
+
+      it 'filters posts by created_at range' do
+        get '/posts', params: {
+          created_from: Time.zone.local(2010, 1, 1, 0, 0, 0).iso8601,
+          created_to: Time.zone.local(2010, 12, 31, 23, 59, 59).iso8601
+        }
+
+        expect(response).to have_http_status(:ok)
+        ids = json.fetch('posts').map { |p| p['id'] }
+
+        expect(ids).to include(created_hit_post.id)
+        expect(ids).not_to include(created_miss_post.id)
+        expect(json.fetch('count')).to eq(1)
+      end
+    end
+
+    context 'when updated_from/updated_to are provided' do
+      let(:t0) { Time.zone.local(2011, 2, 1, 12, 0, 0) }
+      let(:t1) { Time.zone.local(2011, 2, 10, 12, 0, 0) }
+
+      let!(:updated_hit_post) do
+        p = nil
+        travel_to(t0) do
+          p = Post.create!(uploaded_user: user, title: 'updated hit',
+                           url: 'https://example.com/updated-hit').tap do |pp|
+            PostTag.create!(post: pp, tag:)
+          end
+        end
+        travel_to(t1) do
+          p.update!(title: 'updated hit v2')
+        end
+        p
+      end
+
+      let!(:updated_miss_post) do
+        travel_to(Time.zone.local(2013, 1, 1, 12, 0, 0)) do
+          Post.create!(uploaded_user: user, title: 'updated miss',
+                       url: 'https://example.com/updated-miss').tap do |p|
+            PostTag.create!(post: p, tag:)
+          end
+        end
+      end
+
+      it 'filters posts by updated_at range' do
+        get '/posts', params: {
+          updated_from: Time.zone.local(2011, 2, 5, 0, 0, 0).iso8601,
+          updated_to: Time.zone.local(2011, 2, 20, 23, 59, 59).iso8601
+        }
+
+        expect(response).to have_http_status(:ok)
+        ids = json.fetch('posts').map { |p| p['id'] }
+
+        expect(ids).to include(updated_hit_post.id)
+        expect(ids).not_to include(updated_miss_post.id)
+        expect(json.fetch('count')).to eq(1)
+      end
+    end
+
+    context 'when original_created_from/original_created_to are provided' do
+      # 注意: controller の現状ロジックに合わせてる
+      # original_created_from は `original_created_before > ?`
+      # original_created_to   は `original_created_from <= ?`
+
+      let!(:oc_hit_post) do
+        Post.create!(uploaded_user: user, title: 'oc hit',
+                     url: 'https://example.com/oc-hit',
+                     original_created_from: Time.zone.local(2015, 1, 1, 0, 0, 0),
+                     original_created_before: Time.zone.local(2015, 1, 10, 0, 0, 0)).tap do |p|
+          PostTag.create!(post: p, tag:)
+        end
+      end
+
+      # original_created_from の条件は「original_created_before > param」なので、
+      # before が param 以下になるようにする（ただし before >= from は守る）
+      let!(:oc_miss_post_for_from) do
+        Post.create!(
+          uploaded_user: user,
+          title: 'oc miss for from',
+          url: 'https://example.com/oc-miss-from',
+          original_created_from: Time.zone.local(2014, 12, 1, 0, 0, 0),
+          original_created_before: Time.zone.local(2015, 1, 1, 0, 0, 0)
+        ).tap { |p| PostTag.create!(post: p, tag:) }
+      end
+
+      # original_created_to の条件は「original_created_from <= param」なので、
+      # from が param より後になるようにする（before >= from は守る）
+      let!(:oc_miss_post_for_to) do
+        Post.create!(
+          uploaded_user: user,
+          title: 'oc miss for to',
+          url: 'https://example.com/oc-miss-to',
+          original_created_from: Time.zone.local(2015, 2, 1, 0, 0, 0),
+          original_created_before: Time.zone.local(2015, 2, 10, 0, 0, 0)
+        ).tap { |p| PostTag.create!(post: p, tag:) }
+      end
+
+      it 'filters posts by original_created_from (current controller behavior)' do
+        get '/posts', params: {
+          original_created_from: Time.zone.local(2015, 1, 5, 0, 0, 0).iso8601
+        }
+
+        expect(response).to have_http_status(:ok)
+        ids = json.fetch('posts').map { |p| p['id'] }
+
+        expect(ids).to include(oc_hit_post.id)
+        expect(ids).not_to include(oc_miss_post_for_from.id)
+        expect(json.fetch('count')).to eq(2)
+      end
+
+      it 'filters posts by original_created_to (current controller behavior)' do
+        get '/posts', params: {
+          original_created_to: Time.zone.local(2015, 1, 15, 0, 0, 0).iso8601
+        }
+
+        expect(response).to have_http_status(:ok)
+        ids = json.fetch('posts').map { |p| p['id'] }
+
+        expect(ids).to include(oc_hit_post.id)
+        expect(ids).not_to include(oc_miss_post_for_to.id)
+        expect(json.fetch('count')).to eq(2)
+      end
+    end
   end
 
   describe 'GET /posts/:id' do

backend/spec/requests/tag_children_spec.rb

@@ -1,4 +1,3 @@
-# spec/requests/tag_children_spec.rb
 require "rails_helper"
 
 RSpec.describe "TagChildren", type: :request do

backend/spec/requests/tags_deerjikists_spec.rb

@@ -0,0 +1,102 @@
+require 'rails_helper'
+
+RSpec.describe 'Tags deerjikists API', type: :request do
+  let(:platform1) { 'nico' }
+  let(:code1) { 'deerjika-bot' }
+  let(:platform2) { 'youtube' }
+  let(:code2) { 'deerjika-bot.bsky.social' }
+
+  let!(:tag) { create(:tag, category: :deerjikist) }
+
+  before do
+    # show_by_name / deerjikists_by_name 用に名前を固定
+    tag.tag_name.update!(name: 'deerjika')
+  end
+
+  describe 'GET /tags/:id/deerjikists' do
+    subject(:do_request) do
+      get "/tags/#{ tag_id }/deerjikists"
+    end
+
+    let(:tag_id) { tag.id }
+
+    context 'when tag exists and has no deerjikists' do
+      it 'returns 200 and empty array' do
+        do_request
+        expect(response).to have_http_status(:ok)
+        expect(json).to eq([])
+      end
+    end
+
+    context 'when tag exists and has deerjikists' do
+      before do
+        Deerjikist.create!(platform: platform1, code: code1, tag: tag)
+        Deerjikist.create!(platform: platform2, code: code2, tag: tag)
+      end
+
+      it 'returns 200 and deerjikists array' do
+        do_request
+        expect(response).to have_http_status(:ok)
+
+        expect(json).to be_a(Array)
+        expect(json.size).to eq(2)
+
+        expect(json.map { |h| [h['platform'], h['code']] }).to contain_exactly(
+          [platform1, code1],
+          [platform2, code2],
+        )
+      end
+    end
+
+    context 'when tag does not exist' do
+      let(:tag_id) { 9_999_999 }
+
+      it 'returns 404' do
+        do_request
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+  end
+
+  describe 'GET /tags/name/:name/deerjikists' do
+    subject(:do_request) do
+      get "/tags/name/#{ name }/deerjikists"
+    end
+
+    let(:name) { 'deerjika' }
+
+    context 'when name is blank after strip' do
+      let(:name) { '%20' }
+
+      it 'returns 400' do
+        do_request
+        expect(response).to have_http_status(:bad_request)
+      end
+    end
+
+    context 'when tag does not exist for name' do
+      let(:name) { 'no-such-tag' }
+
+      it 'returns 404' do
+        do_request
+        expect(response).to have_http_status(:not_found)
+      end
+    end
+
+    context 'when tag exists and has deerjikists' do
+      before do
+        Deerjikist.create!(platform: platform1, code: code1, tag: tag)
+      end
+
+      it 'returns 200 and deerjikists array' do
+        do_request
+        expect(response).to have_http_status(:ok)
+
+        expect(json).to be_a(Array)
+        expect(json.size).to eq(1)
+        expect(json[0]['platform']).to eq(platform1)
+        expect(json[0]['code']).to eq(code1)
+      end
+    end
+  end
+end

backend/spec/requests/tags_spec.rb

@@ -106,8 +106,8 @@ RSpec.describe 'Tags API', type: :request do
   end
 
   before do
-    allow(member_user).to receive(:member?).and_return(true)
-    allow(non_member_user).to receive(:member?).and_return(false)
+    allow(member_user).to receive(:gte_member?).and_return(true)
+    allow(non_member_user).to receive(:gte_member?).and_return(false)
   end
 
   describe "PATCH /tags/:id" do

frontend/src/App.tsx

@@ -16,6 +16,7 @@ import PostDetailPage from '@/pages/posts/PostDetailPage'
 import PostHistoryPage from '@/pages/posts/PostHistoryPage'
 import PostListPage from '@/pages/posts/PostListPage'
 import PostNewPage from '@/pages/posts/PostNewPage'
+import PostSearchPage from '@/pages/posts/PostSearchPage'
 import ServiceUnavailable from '@/pages/ServiceUnavailable'
 import SettingPage from '@/pages/users/SettingPage'
 import WikiDetailPage from '@/pages/wiki/WikiDetailPage'
@@ -42,6 +43,7 @@ const RouteTransitionWrapper = ({ user, setUser }: {
 	    <Route path="/" element={<Navigate to="/posts" replace/>}/>
 	    <Route path="/posts" element={<PostListPage/>}/>
 	    <Route path="/posts/new" element={<PostNewPage user={user}/>}/>
+	    <Route path="/posts/search" element={<PostSearchPage/>}/>
 	    <Route path="/posts/:id" element={<PostDetailRoute user={user}/>}/>
 	    <Route path="/posts/changes" element={<PostHistoryPage/>}/>
 	    <Route path="/tags/nico" element={<NicoTagListPage user={user}/>}/>

frontend/src/components/PostEmbed.tsx

@@ -18,17 +18,35 @@ export default (({ post }: Props) => {
   {
   case 'nicovideo.jp':
     {
-      const [videoId] = url.pathname.match (/(?<=\/watch\/)[a-zA-Z0-9]+?(?=\/|$)/)!
+      const mVideoId = url.pathname.match (/(?<=\/watch\/)[a-zA-Z0-9]+?(?=\/|$)/)
+      if (!(mVideoId))
+	break
+
+      const [videoId] = mVideoId
+
       return <NicoViewer id={videoId} width={640} height={360}/>
     }
+
   case 'twitter.com':
   case 'x.com':
-    const [userId] = url.pathname.match (/(?<=\/)[^\/]+?(?=\/|$|\?)/)!
-    const [statusId] = url.pathname.match (/(?<=\/status\/)\d+?(?=\/|$|\?)/)!
-    return <TwitterEmbed userId={userId} statusId={statusId}/>
+    {
+      const mUserId = url.pathname.match (/(?<=\/)[^\/]+?(?=\/|$|\?)/)
+      const mStatusId = url.pathname.match (/(?<=\/status\/)\d+?(?=\/|$|\?)/)
+      if (!(mUserId) || !(mStatusId))
+	break
+
+      const [userId] = mUserId
+      const [statusId] = mStatusId
+
+      return <TwitterEmbed userId={userId} statusId={statusId}/>
+    }
+
   case 'youtube.com':
     {
-      const videoId = url.searchParams.get ('v')!
+      const videoId = url.searchParams.get ('v')
+      if (!(videoId))
+	break
+
       return (
 	  <YoutubeEmbed videoId={videoId} opts={{ playerVars: {
 	      playsinline:  1,

frontend/src/components/PostFormTagsArea.tsx

@@ -1,3 +1,5 @@
+// TODO: TagSearch と共通化する．
+
 import { useRef, useState } from 'react'
 
 import TagSearchBox from '@/components/TagSearchBox'
@@ -25,8 +27,8 @@ const getTokenAt = (value: string, pos: number) => {
 }
 
 
-const replaceToken = (value: string, start: number, end: number, text: string) => (
-    `${ value.slice (0, start) }${ text }${ value.slice (end) }`)
+const replaceToken = (value: string, start: number, end: number, text: string) =>
+    `${ value.slice (0, start) }${ text }${ value.slice (end) }`
 
 
 type Props = {
@@ -38,16 +40,17 @@ export default (({ tags, setTags }: Props) => {
   const ref = useRef<HTMLTextAreaElement> (null)
 
   const [bounds, setBounds] = useState<{ start: number; end: number }> ({ start: 0, end: 0 })
+  const [focused, setFocused] = useState (false)
   const [suggestions, setSuggestions] = useState<Tag[]> ([])
   const [suggestionsVsbl, setSuggestionsVsbl] = useState (false)
 
   const handleTagSelect = (tag: Tag) => {
     setSuggestionsVsbl (false)
     const textarea = ref.current!
-    const newValue = replaceToken (tags, bounds.start, bounds.end, tag.name)
+    const newValue = replaceToken (tags, bounds.start, bounds.end, tag.name + ' ')
     setTags (newValue)
     requestAnimationFrame (async () => {
-      const p = bounds.start + tag.name.length
+      const p = bounds.start + tag.name.length + 1
       textarea.selectionStart = textarea.selectionEnd = p
       textarea.focus ()
       await recompute (p, newValue)
@@ -56,14 +59,21 @@ export default (({ tags, setTags }: Props) => {
 
   const recompute = async (pos: number, v: string = tags) => {
     const { start, end, token } = getTokenAt (v, pos)
+    if (!(token.trim ()))
+      {
+	setSuggestionsVsbl (false)
+	return
+      }
+
     setBounds ({ start, end })
-    const data = await apiGet<Tag[]> ('/tags/autocomplete', { params: { q: token } })
+
+    const data = await apiGet<Tag[]> ('/tags/autocomplete', { params: { q: token, nico: '0' } })
     setSuggestions (data.filter (t => t.postCount > 0))
     setSuggestionsVsbl (suggestions.length > 0)
   }
 
   return (
-      <div>
+      <div className="relative w-full">
 	<Label>タグ</Label>
 	<TextArea
 	    ref={ref}
@@ -72,11 +82,18 @@ export default (({ tags, setTags }: Props) => {
 	    onSelect={async (ev: SyntheticEvent<HTMLTextAreaElement>) => {
 	      const pos = (ev.target as HTMLTextAreaElement).selectionStart
 	      await recompute (pos)
+	    }}
+	    onFocus={() => setFocused (true)}
+	    onBlur={() => {
+	      setFocused (false)
+	      setSuggestionsVsbl (false)
 	    }}/>
-	<TagSearchBox suggestions={suggestionsVsbl && suggestions.length
-				   ? suggestions
-				   : [] as Tag[]}
-		      activeIndex={-1}
-		      onSelect={handleTagSelect}/>
+	{focused && (
+	    <TagSearchBox
+		suggestions={suggestionsVsbl && suggestions.length > 0
+			     ? suggestions
+			     : [] as Tag[]}
+		activeIndex={-1}
+		onSelect={handleTagSelect}/>)}
       </div>)
 }) satisfies FC<Props>

frontend/src/components/PostOriginalCreatedTimeField.tsx

@@ -1,5 +1,6 @@
 import DateTimeField from '@/components/common/DateTimeField'
 import Label from '@/components/common/Label'
+import { Button } from '@/components/ui/button'
 
 import type { FC } from 'react'
 
@@ -16,34 +17,52 @@ export default (({ originalCreatedFrom,
 		   setOriginalCreatedBefore }: Props) => (
     <div>
       <Label>オリジナルの作成日時</Label>
-      <div className="my-1">
-	<DateTimeField
-	    className="mr-2"
-	    value={originalCreatedFrom ?? undefined}
-	    onChange={setOriginalCreatedFrom}
-	    onBlur={ev => {
-	      const v = ev.target.value
-	      if (!(v))
-		return
-	      const d = new Date (v)
-	      if (d.getSeconds () === 0)
-		{
-		  if (d.getMinutes () === 0 && d.getHours () === 0)
-		    d.setDate (d.getDate () + 1)
-		  else
-		    d.setMinutes (d.getMinutes () + 1)
-		}
-	      else
-		d.setSeconds (d.getSeconds () + 1)
-	      setOriginalCreatedBefore (d.toISOString ())
-	    }}/>
-	以降
+      <div className="my-1 flex">
+	<div className="w-80">
+	  <DateTimeField
+	      className="mr-2"
+	      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
+	      className="bg-gray-600 text-white rounded"
+	      onClick={() => {
+		setOriginalCreatedFrom (null)
+	      }}>
+	    リセット
+	  </Button>
+	</div>
       </div>
-      <div className="my-1">
-	<DateTimeField
-	    className="mr-2"
-	    value={originalCreatedBefore ?? undefined}
-	    onChange={setOriginalCreatedBefore}/>
-	より前
+      <div className="my-1 flex">
+	<div className="w-80">
+	  <DateTimeField
+	      className="mr-2"
+	      value={originalCreatedBefore ?? undefined}
+	      onChange={setOriginalCreatedBefore}/>
+	  より前
+	</div>
+	<div>
+	  <Button
+	      className="bg-gray-600 text-white rounded"
+	      onClick={() => {
+		setOriginalCreatedBefore (null)
+	      }}>
+	    リセット
+	  </Button>
+	</div>
       </div>
     </div>)) satisfies FC<Props>

frontend/src/components/TagDetailSidebar.tsx

@@ -19,6 +19,7 @@ import SidebarComponent from '@/components/layout/SidebarComponent'
 import { toast } from '@/components/ui/use-toast'
 import { CATEGORIES } from '@/consts'
 import { apiDelete, apiGet, apiPatch, apiPost } from '@/lib/api'
+import { dateString, originalCreatedAtString } from '@/lib/utils'
 
 import type { DragEndEvent } from '@dnd-kit/core'
 import type { FC, MutableRefObject, ReactNode } from 'react'
@@ -343,7 +344,7 @@ export default (({ post }: Props) => {
 		       : 'bot操作'}
 		    </li>
 		    */}
-		    <li>耕作日時: {(new Date (post.createdAt)).toLocaleString ()}</li>
+		    <li>耕作日時: {dateString (post.createdAt)}</li>
 		    <li>
 		      <>リンク: </>
 		      <a
@@ -355,20 +356,14 @@ export default (({ post }: Props) => {
 		      </a>
 		    </li>
 		    <li>
-		      {/* TODO: 表示形式きしょすぎるので何とかする */}
 		      <>オリジナルの投稿日時: </>
-		      {!(post.originalCreatedFrom) && !(post.originalCreatedBefore)
-		       ? '不明'
-		       : (
-			  <>
-			    {post.originalCreatedFrom
-			     && `${ (new Date (post.originalCreatedFrom)).toLocaleString () } 以降 `}
-			    {post.originalCreatedBefore
-			     && `${ (new Date (post.originalCreatedBefore)).toLocaleString () } より前`}
-			  </>)}
+		      {originalCreatedAtString (post.originalCreatedFrom,
+						post.originalCreatedBefore)}
 		    </li>
 		    <li>
-		      <PrefetchLink to={`/posts/changes?id=${ post.id }`}>履歴</PrefetchLink>
+		      <PrefetchLink to={`/posts/changes?id=${ post.id }`}>
+			履歴
+		      </PrefetchLink>
 		    </li>
 		  </ul>
 		</div>)}

frontend/src/components/TagSearch.tsx

@@ -1,3 +1,5 @@
+// TODO: タグ入力系すべてに同様の処理あるため共通化する．
+
 import { useEffect, useState } from 'react'
 import { useNavigate, useLocation } from 'react-router-dom'
 

frontend/src/components/TopNav.tsx

@@ -69,8 +69,9 @@ export default (({ user }: Props) => {
   const menu: Menu = [
       { name: '広場', to: '/posts', subMenu: [
 	  { name: '一覧', to: '/posts' },
+	  { name: '検索', to: '/posts/search' },
 	  { name: '投稿追加', to: '/posts/new' },
-	  { name: '耕作履歴', to: '/posts/changes' },
+	  { name: '履歴', to: '/posts/changes' },
 	  { name: 'ヘルプ', to: '/wiki/ヘルプ:広場' }] },
       { name: 'タグ', to: '/tags', subMenu: [
 	  { name: 'タグ一覧', to: '/tags', visible: false },

frontend/src/components/common/DateTimeField.tsx

@@ -5,7 +5,7 @@ import { cn } from '@/lib/utils'
 import type { FC, FocusEvent } from 'react'
 
 
-const pad = (n: number) => n.toString ().padStart (2, '0')
+const pad = (n: number): string => n.toString ().padStart (2, '0')
 
 
 const toDateTimeLocalValue = (d: Date) => {
@@ -14,8 +14,7 @@ const toDateTimeLocalValue = (d: Date) => {
   const day = pad (d.getDate ())
   const h = pad (d.getHours ())
   const min = pad (d.getMinutes ())
-  const s = pad (d.getSeconds ())
-  return `${ y }-${ m }-${ day }T${ h }:${ min }:${ s }`
+  return `${ y }-${ m }-${ day }T${ h }:${ min }:00`
 }
 
 
@@ -37,7 +36,6 @@ export default (({ value, onChange, className, onBlur }: Props) => {
       <input
 	  className={cn ('border rounded p-2', className)}
 	  type="datetime-local"
-	  step={1}
 	  value={local}
 	  onChange={ev => {
 	    const v = ev.target.value

frontend/src/consts.ts

@@ -3,13 +3,23 @@ import type { Category } from 'types'
 export const LIGHT_COLOUR_SHADE = 800
 export const DARK_COLOUR_SHADE = 300
 
-export const CATEGORIES = ['deerjikist',
-			   'meme',
-			   'character',
-			   'general',
-			   'material',
-			   'meta',
-			   'nico'] as const
+export const CATEGORIES = [
+    'deerjikist',
+    'meme',
+    'character',
+    'general',
+    'material',
+    'meta',
+    'nico',
+    ] as const
+
+export const FETCH_POSTS_ORDER_FIELDS = [
+    'title',
+    'url',
+    'original_created_at',
+    'created_at',
+    'updated_at',
+    ] as const
 
 export const TAG_COLOUR = {
     deerjikist: 'rose',
@@ -18,10 +28,13 @@ export const TAG_COLOUR = {
     general:    'cyan',
     material:   'orange',
     meta:       'yellow',
-    nico:       'gray' } as const satisfies Record<Category, string>
+    nico:       'gray',
+    } as const satisfies Record<Category, string>
 
 export const USER_ROLES = ['admin', 'member', 'guest'] as const
 
-export const ViewFlagBehavior = { OnShowedDetail: 1,
-				  OnClickedLink:  2,
-				  NotAuto:        3 } as const
+export const ViewFlagBehavior = {
+    OnShowedDetail: 1,
+    OnClickedLink:  2,
+    NotAuto:        3,
+    } as const

frontend/src/lib/posts.ts

@@ -1,25 +1,28 @@
 import { apiDelete, apiGet, apiPost } from '@/lib/api'
 
-import type { Post, PostTagChange } from '@/types'
+import type { FetchPostsParams, Post, PostTagChange } from '@/types'
 
 
 export const fetchPosts = async (
-    { tags, match, page, limit, cursor }: {
-	tags:     string
-	match:    'any' | 'all'
-	page?:    number
-	limit?:   number
-	cursor?:  string }
+    { url, title, tags, match, createdFrom, createdTo, updatedFrom, updatedTo,
+      originalCreatedFrom, originalCreatedTo, page, limit, order }: FetchPostsParams
 ): Promise<{
-    posts:      Post[]
-    count:      number
-    nextCursor: string }> =>
+    posts:  Post[]
+    count:  number }> =>
 	await apiGet ('/posts', { params: {
-	    tags,
-	    match,
+	    ...(url && { url }),
+	    ...(title && { title }),
+	    ...(tags && { tags }),
+	    ...(match && { match }),
+	    ...(createdFrom && { created_from: createdFrom }),
+	    ...(createdTo && { created_to: createdTo }),
+	    ...(updatedFrom && { updated_from: updatedFrom }),
+	    ...(updatedTo && { updated_to: updatedTo }),
+	    ...(originalCreatedFrom && { original_created_from: originalCreatedFrom }),
+	    ...(originalCreatedTo && { original_created_to: originalCreatedTo }),
 	    ...(page && { page }),
 	    ...(limit && { limit }),
-	    ...(cursor && { cursor }) } })
+	    ...(order && { order }) } })
 
 
 export const fetchPost = async (id: string): Promise<Post> => await apiGet (`/posts/${ id }`)

frontend/src/lib/prefetchers.ts

@@ -8,6 +8,8 @@ import { fetchWikiPage,
 	 fetchWikiPageByTitle,
 	 fetchWikiPages } from '@/lib/wiki'
 
+import type { FetchPostsOrder } from '@/types'
+
 type Prefetcher = (qc: QueryClient, url: URL) => Promise<void>
 
 const mPost = match<{ id: string }> ('/posts/:id')
@@ -59,7 +61,20 @@ const prefetchWikiPageShow: Prefetcher = async (qc, url) => {
   if (version)
     return
 
-  const p = { tags: effectiveTitle, match: 'all', page: 1, limit: 8 } as const
+  const p = {
+      tags: effectiveTitle,
+      match: 'all',
+      page: 1,
+      limit: 8,
+      url: '',
+      title: '',
+      originalCreatedFrom: '',
+      originalCreatedTo: '',
+      createdFrom: '',
+      createdTo: '',
+      updatedFrom: '',
+      updatedTo: '',
+      order: 'original_created_at:desc' } as const
   await qc.prefetchQuery ({
       queryKey: postsKeys.index (p),
       queryFn:  () => fetchPosts (p) })
@@ -68,13 +83,27 @@ const prefetchWikiPageShow: Prefetcher = async (qc, url) => {
 
 const prefetchPostsIndex: Prefetcher = async (qc, url) => {
   const tags = url.searchParams.get ('tags') ?? ''
-  const m = url.searchParams.get ('match') === 'any' ? 'any' : 'all'
+  const qURL = url.searchParams.get ('url') ?? ''
+  const title = url.searchParams.get ('title') ?? ''
+  const originalCreatedFrom = url.searchParams.get ('original_created_from') ?? ''
+  const originalCreatedTo = url.searchParams.get ('original_created_to') ?? ''
+  const createdFrom = url.searchParams.get ('created_from') ?? ''
+  const createdTo = url.searchParams.get ('created_to') ?? ''
+  const updatedFrom = url.searchParams.get ('updated_from') ?? ''
+  const updatedTo = url.searchParams.get ('updated_to') ?? ''
+  const m: 'all' | 'any' = url.searchParams.get ('match') === 'any' ? 'any' : 'all'
   const page = Number (url.searchParams.get ('page') || 1)
   const limit = Number (url.searchParams.get ('limit') || 20)
+  const order = (url.searchParams.get ('order') ?? 'original_created_at:desc') as FetchPostsOrder
+
+  const keys = {
+      tags, match: m, page, limit, url: qURL, title,
+      originalCreatedFrom, originalCreatedTo, createdFrom, createdTo,
+      updatedFrom, updatedTo, order }
 
   await qc.prefetchQuery ({
-      queryKey: postsKeys.index ({ tags, match: m, page, limit }),
-      queryFn:  () => fetchPosts ({ tags, match: m, page, limit }) })
+      queryKey: postsKeys.index (keys),
+      queryFn:  () => fetchPosts (keys) })
 }
 
 
@@ -103,8 +132,9 @@ const prefetchPostChanges: Prefetcher = async (qc, url) => {
 
 
 export const routePrefetchers: { test: (u: URL) => boolean; run: Prefetcher }[] = [
-    { test: u => u.pathname === '/' || u.pathname === '/posts', run: prefetchPostsIndex },
-    { test: u => (!(['/posts/new', '/posts/changes'].includes (u.pathname))
+    { test: u => ['/', '/posts', '/posts/search'].includes (u.pathname),
+      run: prefetchPostsIndex },
+    { test: u => (!(['/posts/new', '/posts/changes', '/posts/search'].includes (u.pathname))
 		  && Boolean (mPost (u.pathname))),
       run: prefetchPostShow },
     { test: u => u.pathname === '/posts/changes', run: prefetchPostChanges },
@@ -119,5 +149,6 @@ export const prefetchForURL = async (qc: QueryClient, urlLike: string): Promise<
   const r = routePrefetchers.find (x => x.test (u))
   if (!(r))
     return
+
   await r.run (qc, u)
 }

frontend/src/lib/queryKeys.ts

@@ -1,7 +1,8 @@
+import type { FetchPostsParams } from '@/types'
+
 export const postsKeys = {
     root:     ['posts'] as const,
-    index:    (p: { tags: string; match: 'any' | 'all'; page: number; limit: number }) =>
-		  ['posts', 'index', p] as const,
+    index:    (p: FetchPostsParams) => ['posts', 'index', p] as const,
     show:     (id: string) => ['posts', id] as const,
     related:  (id: string) => ['related', id] as const,
     changes:  (p: { id?: string; page: number; limit: number }) =>

frontend/src/lib/utils.ts

@@ -1,6 +1,26 @@
-import { clsx, type ClassValue } from 'clsx'
+import { clsx } from 'clsx'
 import { twMerge } from 'tailwind-merge'
 
-export function cn (...inputs: ClassValue[]) {
-  return twMerge(clsx(...inputs))
-}
+import type { ClassValue } from 'clsx'
+
+
+export const toDate = (d: string | Date): Date => typeof d === 'string' ? new Date (d) : d
+
+
+export const cn = (...inputs: ClassValue[]) => twMerge (clsx (...inputs))
+
+
+export const dateString = (d: string | Date): string =>
+    toDate (d).toLocaleString ('ja-JP-u-ca-japanese')
+
+
+// TODO: 表示形式きしょすぎるので何とかする
+export const originalCreatedAtString = (
+    f:  string | Date | null,
+    b:  string | Date | null,
+): string =>
+    ([f ? `${ dateString (f) } 以降` : '',
+      b ? `${ dateString (b) } より前` : '']
+     .filter (Boolean)
+     .join (' '))
+    || '不明'

frontend/src/pages/posts/PostHistoryPage.tsx

@@ -1,4 +1,6 @@
 import { useQuery } from '@tanstack/react-query'
+import { motion } from 'framer-motion'
+import { useEffect } from 'react'
 import { Helmet } from 'react-helmet-async'
 import { useLocation } from 'react-router-dom'
 
@@ -10,6 +12,7 @@ import MainArea from '@/components/layout/MainArea'
 import { SITE_TITLE } from '@/config'
 import { fetchPostChanges } from '@/lib/posts'
 import { postsKeys } from '@/lib/queryKeys'
+import { cn, dateString } from '@/lib/utils'
 
 import type { FC } from 'react'
 
@@ -30,6 +33,10 @@ export default (() => {
   const changes = data?.changes ?? []
   const totalPages = data ? Math.ceil (data.count / limit) : 0
 
+  useEffect (() => {
+    document.querySelector ('table')?.scrollIntoView ({ behavior: 'smooth' })
+  }, [location.search])
+
   return (
       <MainArea>
 	<Helmet>
@@ -44,7 +51,7 @@ export default (() => {
 	{loading ? 'Loading...' : (
 	    <>
 	      <table className="table-auto w-full border-collapse">
-		<thead>
+		<thead className="border-b-2 border-black dark:border-white">
 		  <tr>
 		    <th className="p-2 text-left">投稿</th>
 		    <th className="p-2 text-left">変更</th>
@@ -64,27 +71,39 @@ export default (() => {
 			  ++rowsCnt
 		      }
 		    return (
-			<tr key={`${ change.timestamp }-${ change.post.id }-${ change.tag.id }`}>
+			<tr key={`${ change.timestamp }-${ change.post.id }-${ change.tag.id }`}
+			    className={cn ('even:bg-gray-100 dark:even:bg-gray-700',
+					   withPost && 'border-t')}>
 			  {withPost && (
-			      <td className="align-top" rowSpan={rowsCnt}>
+			      <td className="align-top p-2 bg-white dark:bg-[#242424] border-r"
+				  rowSpan={rowsCnt}>
 				<PrefetchLink to={`/posts/${ change.post.id }`}>
-				  <img src={change.post.thumbnail || change.post.thumbnailBase || undefined}
-				       alt={change.post.title || change.post.url}
-				       title={change.post.title || change.post.url || undefined}
-				       className="w-40"/>
+				  <motion.div
+				      layoutId={`page-${ change.post.id }`}
+				      transition={{ type: 'spring',
+						    stiffness: 500,
+						    damping: 40,
+						    mass: .5 }}>
+				    <img src={change.post.thumbnail || change.post.thumbnailBase || undefined}
+					 alt={change.post.title || change.post.url}
+					 title={change.post.title || change.post.url || undefined}
+					 className="w-40"/>
+				  </motion.div>
 				</PrefetchLink>
 			      </td>)}
-			  <td>
+			  <td className="p-2">
 			    <TagLink tag={change.tag} withWiki={false} withCount={false}/>
 			    {`を${ change.changeType === 'add' ? '記載' : '消除' }`}
 			  </td>
-			  <td>
-			    {change.user ? (
+			  <td className="p-2">
+			    {change.user
+			     ? (
 				<PrefetchLink to={`/users/${ change.user.id }`}>
 				  {change.user.name}
-				</PrefetchLink>) : 'bot 操作'}
+				</PrefetchLink>)
+			     : 'bot 操作'}
 			    <br/>
-			    {change.timestamp}
+			    {dateString (change.timestamp)}
 			  </td>
 			</tr>)
 		  })}

frontend/src/pages/posts/PostListPage.tsx

@@ -35,11 +35,16 @@ export default (() => {
   const page = Number (query.get ('page') ?? 1)
   const limit = Number (query.get ('limit') ?? 20)
 
+  const keys = {
+      tags: tagsKey, match, page, limit,
+      url: '', title: '', originalCreatedFrom: '', originalCreatedTo: '',
+      createdFrom: '', createdTo: '', updatedFrom: '', updatedTo: '',
+      order: 'original_created_at:desc' } as const
   const { data, isLoading: loading } = useQuery ({
-      queryKey: postsKeys.index ({ tags: tagsKey, match, page, limit }),
-      queryFn:  () => fetchPosts ({ tags: tagsKey, match, page, limit }) })
+      queryKey: postsKeys.index (keys),
+      queryFn:  () => fetchPosts (keys) })
   const posts = data?.posts ?? []
-  const cursor = data?.nextCursor ?? ''
+  const cursor = ''
   const totalPages = data ? Math.ceil (data.count / limit) : 0
 
   useLayoutEffect (() => {

frontend/src/pages/posts/PostSearchPage.tsx

@@ -0,0 +1,410 @@
+import { useQuery } from '@tanstack/react-query'
+import { motion } from 'framer-motion'
+import { useEffect, useMemo, useState } from 'react'
+import { Helmet } from 'react-helmet-async'
+import { useLocation, useNavigate } from 'react-router-dom'
+
+import PrefetchLink from '@/components/PrefetchLink'
+import TagLink from '@/components/TagLink'
+import TagSearchBox from '@/components/TagSearchBox'
+import DateTimeField from '@/components/common/DateTimeField'
+import Label from '@/components/common/Label'
+import PageTitle from '@/components/common/PageTitle'
+import Pagination from '@/components/common/Pagination'
+import MainArea from '@/components/layout/MainArea'
+import { SITE_TITLE } from '@/config'
+import { apiGet } from '@/lib/api'
+import { fetchPosts } from '@/lib/posts'
+import { postsKeys } from '@/lib/queryKeys'
+import { dateString, originalCreatedAtString } from '@/lib/utils'
+
+import type { FC, ChangeEvent, FormEvent, KeyboardEvent } from 'react'
+
+import type { FetchPostsOrder,
+	      FetchPostsOrderField,
+	      FetchPostsParams,
+	      Tag } from '@/types'
+
+
+const setIf = (qs: URLSearchParams, k: string, v: string | null) => {
+  const t = v?.trim ()
+  if (t)
+    qs.set (k, t)
+}
+
+
+export default (() => {
+  const location = useLocation ()
+
+  const navigate = useNavigate ()
+
+  const query = useMemo (() => new URLSearchParams (location.search),
+			 [location.search])
+
+  const page = Number (query.get ('page') ?? 1)
+  const limit = Number (query.get ('limit') ?? 20)
+
+  const qURL = query.get ('url') ?? ''
+  const qTitle = query.get ('title') ?? ''
+  const qTags = query.get ('tags') ?? ''
+  const qMatch: 'all' | 'any' = query.get ('match') === 'any' ? 'any' : 'all'
+  const qOriginalCreatedFrom = query.get ('original_created_from') ?? ''
+  const qOriginalCreatedTo = query.get ('original_created_to') ?? ''
+  const qCreatedFrom = query.get ('created_from') ?? ''
+  const qCreatedTo = query.get ('created_to') ?? ''
+  const qUpdatedFrom = query.get ('updated_from') ?? ''
+  const qUpdatedTo = query.get ('updated_to') ?? ''
+  const order = (query.get ('order') || 'original_created_at:desc') as FetchPostsOrder
+
+  const [activeIndex, setActiveIndex] = useState (-1)
+  const [createdFrom, setCreatedFrom] = useState<string | null> (null)
+  const [createdTo, setCreatedTo] = useState<string | null> (null)
+  const [matchType, setMatchType] = useState<'all' | 'any'> ('all')
+  const [originalCreatedFrom, setOriginalCreatedFrom] = useState<string | null> (null)
+  const [originalCreatedTo, setOriginalCreatedTo] = useState<string | null> (null)
+  const [suggestions, setSuggestions] = useState<Tag[]> ([])
+  const [suggestionsVsbl, setSuggestionsVsbl] = useState (false)
+  const [tagsStr, setTagsStr] = useState ('')
+  const [title, setTitle] = useState ('')
+  const [updatedFrom, setUpdatedFrom] = useState<string | null> (null)
+  const [updatedTo, setUpdatedTo] = useState<string | null> (null)
+  const [url, setURL] = useState ('')
+
+  const keys: FetchPostsParams = {
+      tags: qTags, match: qMatch, page, limit,
+      url: qURL,
+      title: qTitle,
+      originalCreatedFrom: qOriginalCreatedFrom,
+      originalCreatedTo: qOriginalCreatedTo,
+      createdFrom: qCreatedFrom,
+      createdTo: qCreatedTo,
+      updatedFrom: qUpdatedFrom,
+      updatedTo: qUpdatedTo,
+      order }
+  const { data, isLoading: loading } = useQuery ({
+      queryKey: postsKeys.index (keys),
+      queryFn: () => fetchPosts (keys) })
+  const results = data?.posts ?? []
+  const totalPages = data ? Math.ceil (data.count / limit) : 0
+
+  useEffect (() => {
+    setURL (qURL ?? '')
+    setTitle (qTitle ?? '')
+    setTagsStr (qTags ?? '')
+    setMatchType (qMatch ?? 'all')
+    setOriginalCreatedFrom (qOriginalCreatedFrom)
+    setOriginalCreatedTo (qOriginalCreatedTo)
+    setCreatedFrom (qCreatedFrom)
+    setCreatedTo (qCreatedTo)
+    setUpdatedFrom (qUpdatedFrom)
+    setUpdatedTo (qUpdatedTo)
+
+    document.querySelector ('table')?.scrollIntoView ({ behavior: 'smooth' })
+  }, [location.search])
+
+  const SortHeader = ({ by, label }: { by: FetchPostsOrderField; label: string }) => {
+    const [fld, dir] = order.split (':')
+
+    const qs = new URLSearchParams (location.search)
+    const nextDir =
+	(by === fld)
+	? (dir === 'asc' ? 'desc' : 'asc')
+	: (['title', 'url'].includes (by) ? 'asc' : 'desc')
+    qs.set ('order', `${ by }:${ nextDir }`)
+    qs.set ('page', '1')
+
+    return (
+	<PrefetchLink
+	    className="text-inherit visited:text-inherit hover:text-inherit"
+	    to={`${ location.pathname }?${ qs.toString () }`}>
+	  <span className="font-bold">
+	    {label}
+	    {by === fld && (dir === 'asc' ? ' ▲' : ' ▼')}
+	  </span>
+	</PrefetchLink>)
+  }
+
+  // TODO: TagSearch からのコピペのため，共通化を考へる．
+  const whenChanged = async (ev: ChangeEvent<HTMLInputElement>) => {
+    setTagsStr (ev.target.value)
+
+    const q = ev.target.value.trim ().split (' ').at (-1)
+    if (!(q))
+      {
+	setSuggestions ([])
+	return
+      }
+
+    const data = await apiGet<Tag[]> ('/tags/autocomplete', { params: { q } })
+    setSuggestions (data.filter (t => t.postCount > 0))
+    if (suggestions.length > 0)
+      setSuggestionsVsbl (true)
+  }
+
+  // TODO: TagSearch からのコピペのため，共通化を考へる．
+  const handleKeyDown = (ev: KeyboardEvent<HTMLInputElement>) => {
+    switch (ev.key)
+    {
+    case 'ArrowDown':
+      ev.preventDefault ()
+      setActiveIndex (i => Math.min (i + 1, suggestions.length - 1))
+      setSuggestionsVsbl (true)
+      break
+
+    case 'ArrowUp':
+      ev.preventDefault ()
+      setActiveIndex (i => Math.max (i - 1, -1))
+      setSuggestionsVsbl (true)
+      break
+
+    case 'Enter':
+      if (activeIndex < 0)
+	break
+      ev.preventDefault ()
+      const selected = suggestions[activeIndex]
+      selected && handleTagSelect (selected)
+      break
+
+    case 'Escape':
+      ev.preventDefault ()
+      setSuggestionsVsbl (false)
+      break
+    }
+    if (ev.key === 'Enter' && (!(suggestionsVsbl) || activeIndex < 0))
+      {
+	setSuggestionsVsbl (false)
+      }
+  }
+
+  const search = async () => {
+    const qs = new URLSearchParams ()
+    setIf (qs, 'tags', tagsStr)
+    setIf (qs, 'url', url)
+    setIf (qs, 'title', title)
+    setIf (qs, 'original_created_from', originalCreatedFrom)
+    setIf (qs, 'original_created_to', originalCreatedTo)
+    setIf (qs, 'created_from', createdFrom)
+    setIf (qs, 'created_to', createdTo)
+    setIf (qs, 'updated_from', updatedFrom)
+    setIf (qs, 'updated_to', updatedTo)
+    qs.set ('match', matchType)
+    qs.set ('page', String ('1'))
+    qs.set ('order', order)
+    navigate (`${ location.pathname }?${ qs.toString () }`)
+  }
+
+  // TODO: TagSearch からのコピペのため，共通化を考へる．
+  const handleTagSelect = (tag: Tag) => {
+    const parts = tagsStr.split (' ')
+    parts[parts.length - 1] = tag.name
+    setTagsStr (parts.join (' ') + ' ')
+    setSuggestions ([])
+    setActiveIndex (-1)
+  }
+
+  const handleSearch = (e: FormEvent) => {
+    e.preventDefault ()
+    search ()
+  }
+
+  return (
+      <MainArea>
+	<Helmet>
+	  <title>広場検索 | {SITE_TITLE}</title>
+	</Helmet>
+
+	<div className="max-w-xl">
+	  <PageTitle>広場検索</PageTitle>
+
+	  <form onSubmit={handleSearch} className="space-y-2">
+	    {/* タイトル */}
+	    <div>
+	      <Label>タイトル</Label>
+	      <input
+		  type="text"
+		  value={title}
+		  onChange={e => setTitle (e.target.value)}
+		  className="w-full border p-2 rounded"/>
+	    </div>
+
+	    {/* URL */}
+	    <div>
+	      <Label>URL</Label>
+	      <input
+		  type="text"
+		  value={url}
+		  onChange={e => setURL (e.target.value)}
+		  className="w-full border p-2 rounded"/>
+	    </div>
+
+	    {/* タグ */}
+	    <div className="relative">
+	      <Label>タグ</Label>
+	      <input
+		  type="text"
+		  value={tagsStr}
+		  onChange={whenChanged}
+		  onFocus={() => setSuggestionsVsbl (true)}
+		  onBlur={() => setSuggestionsVsbl (false)}
+		  onKeyDown={handleKeyDown}
+		  className="w-full border p-2 rounded"/>
+	      <TagSearchBox
+		  suggestions={
+		      suggestionsVsbl && suggestions.length > 0 ? suggestions : [] as Tag[]}
+		  activeIndex={activeIndex}
+		  onSelect={handleTagSelect}/>
+	      <fieldset className="w-full my-2">
+		<label>検索区分：</label>
+		<label className="mx-2">
+		  <input
+		      type="radio"
+		      name="match-type"
+		      checked={matchType === 'all'}
+		      onChange={() => setMatchType ('all')}/>
+		  AND
+		</label>
+		<label className="mx-2">
+		  <input
+		      type="radio"
+		      name="match-type"
+		      checked={matchType === 'any'}
+		      onChange={() => setMatchType ('any')}/>
+		  OR
+		</label>
+	      </fieldset>
+	    </div>
+
+	    {/* オリジナルの投稿日時 */}
+	    <div>
+	      <Label>オリジナルの投稿日時</Label>
+	      <DateTimeField
+		  value={originalCreatedFrom ?? undefined}
+		  onChange={setOriginalCreatedFrom}/>
+	      <span className="mx-1">〜</span>
+	      <DateTimeField
+		  value={originalCreatedTo ?? undefined}
+		  onChange={setOriginalCreatedTo}/>
+	    </div>
+
+	    {/* 投稿日時 */}
+	    <div>
+	      <Label>投稿日時</Label>
+	      <DateTimeField
+		  value={createdFrom ?? undefined}
+		  onChange={setCreatedFrom}/>
+	      <span className="mx-1">〜</span>
+	      <DateTimeField
+		  value={createdTo ?? undefined}
+		  onChange={setCreatedTo}/>
+	    </div>
+
+	    {/* 更新日時 */}
+	    <div>
+	      <Label>更新日時</Label>
+	      <DateTimeField
+		  value={updatedFrom ?? undefined}
+		  onChange={setUpdatedFrom}/>
+	      <span className="mx-1">〜</span>
+	      <DateTimeField
+		  value={updatedTo ?? undefined}
+		  onChange={setUpdatedTo}/>
+	    </div>
+
+	    {/* 検索 */}
+	    <div className="py-3">
+	      <button
+		  type="submit"
+		  className="bg-blue-500 text-white px-4 py-2 rounded">
+		検索
+	      </button>
+	    </div>
+	  </form>
+	</div>
+
+	{loading ? 'Loading...' : (results.length > 0 ? (
+	    <div className="mt-4">
+	      <div className="overflow-x-auto">
+		<table className="w-full min-w-[1200px] table-fixed border-collapse">
+		  <colgroup>
+		    <col className="w-14"/>
+		    <col className="w-72"/>
+		    <col className="w-80"/>
+		    <col className="w-[24rem]"/>
+		    <col className="w-60"/>
+		    <col className="w-44"/>
+		    <col className="w-44"/>
+		  </colgroup>
+
+		  <thead className="border-b-2 border-black dark:border-white">
+		    <tr>
+		      <th className="p-2 text-left whitespace-nowrap">投稿</th>
+		      <th className="p-2 text-left whitespace-nowrap">
+			<SortHeader by="title" label="タイトル"/>
+		      </th>
+		      <th className="p-2 text-left whitespace-nowrap">
+			<SortHeader by="url" label="URL"/>
+		      </th>
+		      <th className="p-2 text-left whitespace-nowrap">タグ</th>
+		      <th className="p-2 text-left whitespace-nowrap">
+			<SortHeader by="original_created_at" label="オリジナルの投稿日時"/>
+		      </th>
+		      <th className="p-2 text-left whitespace-nowrap">
+			<SortHeader by="created_at" label="投稿日時"/>
+		      </th>
+		      <th className="p-2 text-left whitespace-nowrap">
+			<SortHeader by="updated_at" label="更新日時"/>
+		      </th>
+		    </tr>
+		  </thead>
+		  <tbody>
+		    {results.map (row => (
+			<tr key={row.id} className={'even:bg-gray-100 dark:even:bg-gray-700'}>
+			  <td className="p-2">
+			    <PrefetchLink to={`/posts/${ row.id }`} title={row.title}>
+			      <motion.div
+				  layoutId={`page-${ row.id }`}
+				  transition={{ type: 'spring',
+						stiffness: 500,
+						damping: 40,
+						mass: .5 }}>
+				<img src={row.thumbnail || row.thumbnailBase || undefined}
+				     alt={row.title || row.url}
+				     title={row.title || row.url || undefined}
+				     className="w-8"/>
+			      </motion.div>
+			    </PrefetchLink>
+			  </td>
+			  <td className="p-2 truncate">
+			    <PrefetchLink to={`/posts/${ row.id }`} title={row.title}>
+			      {row.title}
+			    </PrefetchLink>
+			  </td>
+			  <td className="p-2 truncate">
+			    <a href={row.url}
+			       title={row.url}
+			       target="_blank"
+			       rel="noopener noreferrer nofollow">
+			      {row.url}
+			    </a>
+			  </td>
+			  <td className="p-2">
+			    {row.tags.map (t => (
+				<span key={t.id} className="mr-2">
+				  <TagLink tag={t} withWiki={false} withCount={false}/>
+				</span>))}
+			  </td>
+			  <td className="p-2">
+			    {originalCreatedAtString (row.originalCreatedFrom,
+						      row.originalCreatedBefore)}
+			  </td>
+			  <td className="p-2">{dateString (row.createdAt)}</td>
+			  <td className="p-2">{dateString (row.updatedAt)}</td>
+			</tr>))}
+		  </tbody>
+		</table>
+	      </div>
+
+	      <Pagination page={page} totalPages={totalPages}/>
+	    </div>) : '結果ないよ（笑）')}
+      </MainArea>)
+}) satisfies FC

frontend/src/pages/tags/NicoTagListPage.tsx

@@ -2,7 +2,7 @@ import { useEffect, useRef, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 
 import TagLink from '@/components/TagLink'
-import SectionTitle from '@/components/common/SectionTitle'
+import PageTitle from '@/components/common/PageTitle'
 import TextArea from '@/components/common/TextArea'
 import MainArea from '@/components/layout/MainArea'
 import { toast } from '@/components/ui/use-toast'
@@ -92,13 +92,13 @@ export default ({ user }: Props) => {
 	</Helmet>
 
 	<div className="max-w-xl">
-	  <SectionTitle>ニコニコ連携</SectionTitle>
+	  <PageTitle>ニコニコ連携</PageTitle>
 	</div>
 
 	<div className="mt-4">
 	  {nicoTags.length > 0 && (
 	      <table className="table-auto w-full border-collapse mb-4">
-		<thead>
+		<thead className="border-b-2 border-black dark:border-white">
 		  <tr>
 		    <th className="p-2 text-left">ニコニコタグ</th>
 		    <th className="p-2 text-left">連携タグ</th>
@@ -107,7 +107,7 @@ export default ({ user }: Props) => {
 		</thead>
 		<tbody>
 		  {nicoTags.map ((tag, i) => (
-		      <tr key={i}>
+		      <tr key={i} className="even:bg-gray-100 dark:even:bg-gray-700">
 			<td className="p-2">
 			  <TagLink tag={tag} withWiki={false} withCount={false}/>
 			</td>
@@ -125,7 +125,7 @@ export default ({ user }: Props) => {
 			      </span>))}
 			</td>
 			{memberFlg && (
-			    <td>
+			    <td className="p-2">
 			      <a href="#" onClick={ev => {
 				ev.preventDefault ()
 				handleEdit (tag.id)

frontend/src/pages/wiki/WikiDetailPage.tsx

@@ -44,10 +44,15 @@ export default () => {
       queryKey: tagsKeys.show (effectiveTitle),
       queryFn:  () => fetchTagByName (effectiveTitle) })
 
+  const keys = {
+      tags: effectiveTitle, match: 'all', page: 1, limit: 8, url: '', title: '',
+      originalCreatedFrom: '', originalCreatedTo: '',
+      createdFrom: '', createdTo: '', updatedFrom: '', updatedTo: '',
+      order: 'original_created_at:desc' } as const
   const { data } = useQuery ({
       enabled:  Boolean (effectiveTitle) && !(version),
-      queryKey: postsKeys.index ({ tags: effectiveTitle, match: 'all', page: 1, limit: 8 }),
-      queryFn:  () => fetchPosts ({ tags: effectiveTitle, match: 'all', page: 1, limit: 8 }) })
+      queryKey: postsKeys.index (keys),
+      queryFn:  () => fetchPosts (keys) })
   const posts = data?.posts || []
 
   useEffect (() => {

frontend/src/pages/wiki/WikiHistoryPage.tsx

@@ -3,9 +3,11 @@ import { Helmet } from 'react-helmet-async'
 import { useLocation } from 'react-router-dom'
 
 import PrefetchLink from '@/components/PrefetchLink'
+import PageTitle from '@/components/common/PageTitle'
 import MainArea from '@/components/layout/MainArea'
 import { SITE_TITLE } from '@/config'
 import { apiGet } from '@/lib/api'
+import { dateString } from '@/lib/utils'
 
 import type { WikiPageChange } from '@/types'
 
@@ -28,8 +30,11 @@ export default () => {
 	<Helmet>
 	  <title>{`Wiki 変更履歴 | ${ SITE_TITLE }`}</title>
 	</Helmet>
+
+	<PageTitle>Wiki 履歴</PageTitle>
+
 	<table className="table-auto w-full border-collapse">
-	  <thead>
+	  <thead className="border-b-2 border-black dark:border-white">
 	    <tr>
 	      <th></th>
 	      <th className="p-2 text-left">タイトル</th>
@@ -39,8 +44,8 @@ export default () => {
 	  </thead>
 	  <tbody>
 	    {changes.map (change => (
-		<tr key={change.revisionId}>
-		  <td>
+		<tr key={change.revisionId} className="even:bg-gray-100 dark:even:bg-gray-700">
+		  <td className="p-2">
 		    {change.pred != null && (
 			<PrefetchLink
 			    to={`/wiki/${ change.wikiPage.id }/diff?from=${ change.pred }&to=${ change.revisionId }`}>
@@ -61,7 +66,7 @@ export default () => {
 		      {change.user.name}
 		    </PrefetchLink>
 		    <br/>
-		    {change.timestamp}
+		    {dateString (change.timestamp)}
 		  </td>
 		</tr>))}
 	  </tbody>

frontend/src/pages/wiki/WikiSearchPage.tsx

@@ -2,10 +2,11 @@ import { useEffect, useState } from 'react'
 import { Helmet } from 'react-helmet-async'
 
 import PrefetchLink from '@/components/PrefetchLink'
-import SectionTitle from '@/components/common/SectionTitle'
+import PageTitle from '@/components/common/PageTitle'
 import MainArea from '@/components/layout/MainArea'
 import { SITE_TITLE } from '@/config'
 import { apiGet } from '@/lib/api'
+import { dateString } from '@/lib/utils'
 
 import type { FormEvent } from 'react'
 
@@ -35,8 +36,9 @@ export default () => {
 	<Helmet>
 	  <title>Wiki | {SITE_TITLE}</title>
 	</Helmet>
+
 	<div className="max-w-xl">
-	  <SectionTitle>Wiki</SectionTitle>
+	  <PageTitle>Wiki</PageTitle>
 	  <form onSubmit={handleSearch} className="space-y-2">
 	    {/* タイトル */}
 	    <div>
@@ -68,7 +70,7 @@ export default () => {
 
 	<div className="mt-4">
 	  <table className="table-auto w-full border-collapse">
-	    <thead>
+	    <thead className="border-b-2 border-black dark:border-white">
 	      <tr>
 		<th className="p-2 text-left">タイトル</th>
 		<th className="p-2 text-left">最終更新</th>
@@ -76,14 +78,14 @@ export default () => {
 	    </thead>
 	    <tbody>
 	      {results.map (page => (
-		  <tr key={page.id}>
+		  <tr key={page.id} className="even:bg-gray-100 dark:even:bg-gray-700">
 		    <td className="p-2">
 		      <PrefetchLink to={`/wiki/${ encodeURIComponent (page.title) }`}>
 			{page.title}
 		      </PrefetchLink>
 		    </td>
-		    <td className="p-2 text-gray-100 text-sm">
-		      {page.updatedAt}
+		    <td className="p-2">
+		      {dateString (page.updatedAt)}
 		    </td>
 		  </tr>))}
 	    </tbody>

frontend/src/types.ts

@@ -1,9 +1,31 @@
-import { CATEGORIES, USER_ROLES, ViewFlagBehavior } from '@/consts'
+import { CATEGORIES,
+	 FETCH_POSTS_ORDER_FIELDS,
+	 USER_ROLES,
+	 ViewFlagBehavior } from '@/consts'
 
 import type { ReactNode } from 'react'
 
 export type Category = typeof CATEGORIES[number]
 
+export type FetchPostsOrder = `${ FetchPostsOrderField }:${ 'asc' | 'desc' }`
+
+export type FetchPostsOrderField = typeof FETCH_POSTS_ORDER_FIELDS[number]
+
+export type FetchPostsParams = {
+    url:                  string
+    title:                string
+    tags:                 string
+    match:                'all' | 'any'
+    originalCreatedFrom:  string
+    originalCreatedTo:    string
+    createdFrom:          string
+    createdTo:            string
+    updatedFrom:          string
+    updatedTo:            string
+    page:                 number
+    limit:                number
+    order:                FetchPostsOrder }
+
 export type Menu = MenuItem[]
 
 export type MenuItem = {
@@ -25,9 +47,10 @@ export type Post = {
     tags:                   Tag[]
     viewed:                 boolean
     related:                Post[]
-    createdAt:              string
     originalCreatedFrom:    string | null
-    originalCreatedBefore:  string | null }
+    originalCreatedBefore:  string | null
+    createdAt:              string
+    updatedAt:              string }
 
 export type PostTagChange = {
     post:       Post