diff --git a/AGENTS.md b/AGENTS.md
index 371090a..aa4f8de 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -281,6 +281,10 @@ case 'no':
 - In TypeScript and TSX, use `value == null` and `value != null` as the
   default nullish checks. Do not use `=== null`, `=== undefined`,
   `!== null`, or `!== undefined`.
+- In JavaScript, JSX, TypeScript, and TSX, never use `_1`, `_2`, or similar
+  Ruby-style numbered parameter names. Reserve numbered parameters for Ruby.
+  Use a meaningful callback parameter name such as `row`, `item`, `value`,
+  `entry`, or `result`.
 - If code appears to need a distinction between `null` and `undefined`, treat
   that as a design smell and revise the logic to avoid the distinction.
   External library APIs that explicitly require distinguishing the two are the
diff --git a/backend/app/models/post.rb b/backend/app/models/post.rb
index 001fb6f..d9d4416 100644
--- a/backend/app/models/post.rb
+++ b/backend/app/models/post.rb
@@ -253,7 +253,7 @@ class Post < ApplicationRecord
         value.match(
             /\A(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2})/ \
             '(?::(\d{2})(?:\.(\d+))?)?' \
-            '(Z|[+-]\d{2}:?\d{2})\z/')
+            '(Z|[+-]\d{2}:?\d{2})?\z/')
     return nil if match.nil?
 
     year = match[1].to_i
@@ -265,16 +265,26 @@ class Post < ApplicationRecord
     fraction = match[7]
     offset = match[8]
     return nil unless valid_original_created_components?(year, month, day, hour, minute, second)
-    return nil unless valid_original_created_offset?(offset)
+    return nil if offset.present? && !(valid_original_created_offset?(offset))
 
-    Time.new(
+    if offset.present?
+      return Time.new(
+          year,
+          month,
+          day,
+          hour,
+          minute,
+          second + Rational(parse_original_created_nanoseconds(fraction), 1_000_000_000),
+          normalise_original_created_offset(offset)).in_time_zone
+    end
+
+    Time.zone.local(
         year,
         month,
         day,
         hour,
         minute,
-        second + Rational(parse_original_created_nanoseconds(fraction), 1_000_000_000),
-        normalise_original_created_offset(offset)).in_time_zone
+        second).change(nsec: parse_original_created_nanoseconds(fraction))
   rescue ArgumentError, TypeError
     nil
   end
diff --git a/frontend/AGENTS.md b/frontend/AGENTS.md
index ba29a77..5c64a93 100644
--- a/frontend/AGENTS.md
+++ b/frontend/AGENTS.md
@@ -173,6 +173,10 @@ pass or the remaining failure is clearly blocked.
   `?` / `:` pairing.
 - Keep short inline props types local when they remain readable and within the
   line limit; do not mechanically extract a named type with no reuse benefit.
+- In JavaScript, JSX, TypeScript, and TSX, never use `_1`, `_2`, or similar
+  Ruby-style numbered parameter names. Reserve numbered parameters for Ruby.
+  Use a meaningful callback parameter name such as `row`, `item`, `value`,
+  `entry`, or `result`.
 - In multi-line object literals, keep the opening `{` with the first pair when
   the line length allows it; do not mechanically explode short objects into
   Prettier-style vertical blocks.
@@ -258,7 +262,7 @@ finally
 ```ts
 const editingRow =
     Number.isFinite (editingSourceRow)
-    ? rows.find (_1 => _1.sourceRow === editingSourceRow) ?? null
+    ? rows.find (row => row.sourceRow === editingSourceRow) ?? null
     : null
 ```
 
diff --git a/frontend/src/components/TopNav.test.tsx b/frontend/src/components/TopNav.test.tsx
index 4d41dcd..d3714d3 100644
--- a/frontend/src/components/TopNav.test.tsx
+++ b/frontend/src/components/TopNav.test.tsx
@@ -8,7 +8,8 @@ const submenuItem = (role: 'guest' | 'member' | 'admin', section: string, item:
     user: buildUser ({ role }),
     wikiId: section === 'Wiki' ? 10 : null,
     pathName: section === 'Wiki' ? '/wiki/page' : '/posts' })
-  return menu.find (_1 => _1.name === section)?.subMenu.find (_1 => _1.name === item)
+  return menu.find (entry => entry.name === section)?.subMenu.find (
+      subMenuItem => subMenuItem.name === item)
 }
 
 describe ('menuOutline', () => {
diff --git a/frontend/src/components/dialogues/DialogueProvider.tsx b/frontend/src/components/dialogues/DialogueProvider.tsx
index 41c887f..3ab04f3 100644
--- a/frontend/src/components/dialogues/DialogueProvider.tsx
+++ b/frontend/src/components/dialogues/DialogueProvider.tsx
@@ -86,7 +86,7 @@ const DialogueProvider: FC<Props> = ({ children }) => {
 
       return current.filter (request => request.id !== id)
     })
-    setPendingIds (current => current.filter (_1 => _1 !== id))
+    setPendingIds (current => current.filter (pendingId => pendingId !== id))
     setFormActions (current => {
 	const { [id]: _, ...rest } = current
 	return rest
@@ -147,7 +147,7 @@ const DialogueProvider: FC<Props> = ({ children }) => {
 	}
 	finally
 	{
-	  setPendingIds (current => current.filter (_1 => _1 !== id))
+	  setPendingIds (current => current.filter (pendingId => pendingId !== id))
 	}
       },
       [closeRequest, pendingIds])
diff --git a/frontend/src/components/posts/import/PostImportRowForm.test.tsx b/frontend/src/components/posts/import/PostImportRowForm.test.tsx
index a80864c..e4f3d08 100644
--- a/frontend/src/components/posts/import/PostImportRowForm.test.tsx
+++ b/frontend/src/components/posts/import/PostImportRowForm.test.tsx
@@ -24,7 +24,7 @@ describe ('PostImportRowForm', () => {
     const titleInput = screen.getByDisplayValue ('manual title')
 
     await waitFor (() => expect (actions.at (-1)?.length).toBe (2))
-    const reset = actions.at (-1)?.find (_1 => _1.label === '変更をリセット')
+    const reset = actions.at (-1)?.find (action => action.label === '変更をリセット')
     expect (reset).toMatchObject ({ placement: 'start', variant: 'danger', disabled: false })
     await act (async () => {
       await reset?.onSelect ()
@@ -34,7 +34,7 @@ describe ('PostImportRowForm', () => {
     expect (titleInput).toHaveValue ('')
     expect (onSave).not.toHaveBeenCalled ()
 
-    const save = actions.at (-1)?.find (_1 => _1.label === '編輯内容を保存')
+    const save = actions.at (-1)?.find (action => action.label === '編輯内容を保存')
     await act (async () => {
       await save?.onSelect ()
     })
@@ -63,7 +63,7 @@ describe ('PostImportRowForm', () => {
     await waitFor (() => expect (actions.length).toBe (2))
 
     await act (async () => {
-      await actions.find (_1 => _1.label === '変更をリセット')?.onSelect ()
+      await actions.find (action => action.label === '変更をリセット')?.onSelect ()
     })
 
     expect (screen.getByDisplayValue ('manual title')).toBeInTheDocument ()
@@ -86,7 +86,7 @@ describe ('PostImportRowForm', () => {
     expect (screen.getByText ('duration error')).toBeInTheDocument ()
     expect (screen.getByText ('title warning')).toBeInTheDocument ()
     expect (screen.getAllByRole ('textbox').filter (
-	_1 => _1.getAttribute ('aria-invalid') === 'true')).toHaveLength (3)
+	textbox => textbox.getAttribute ('aria-invalid') === 'true')).toHaveLength (3)
   })
 
   it ('keeps untouched original created values unchanged in the save payload', async () => {
@@ -111,7 +111,7 @@ describe ('PostImportRowForm', () => {
     await waitFor (() => expect (actions.length).toBe (2))
 
     await act (async () => {
-      await actions.find (_1 => _1.label === '編輯内容を保存')?.onSelect ()
+      await actions.find (action => action.label === '編輯内容を保存')?.onSelect ()
     })
 
     expect (onSave).toHaveBeenCalledWith ({
@@ -120,4 +120,37 @@ describe ('PostImportRowForm', () => {
         originalCreatedBefore: '2024-01-01T12:35+09:00' }),
       resetRequested: false })
   })
+
+  it ('keeps the shared duration and tags string contract without leaking file upload UI', async () => {
+    let actions: DialogueFormAction[] = []
+    const controls: DialogueFormControls = {
+      close: vi.fn (),
+      confirm: vi.fn (),
+      setActions: next => {
+        actions = next
+      } }
+    const onSave = vi.fn ().mockResolvedValue ({ saved: true, row: null })
+
+    const { container } = render (
+        <PostImportRowForm
+            row={buildPostImportRow ({
+              attributes: { duration: '2', tags: 'tag1' } })}
+            controls={controls}
+            onSave={onSave}/>)
+    await waitFor (() => expect (actions.length).toBe (2))
+
+    expect (container.querySelector ('input[type="file"]')).toBeNull ()
+    expect (screen.getByPlaceholderText ('例: 2 / 2.5 / 1:23')).toHaveValue ('2')
+    expect (screen.getByDisplayValue ('tag1')).toBeInTheDocument ()
+
+    await act (async () => {
+      await actions.find (action => action.label === '編輯内容を保存')?.onSelect ()
+    })
+
+    expect (onSave).toHaveBeenCalledWith ({
+      draft: expect.objectContaining ({
+        duration: '2',
+        tags: 'tag1' }),
+      resetRequested: false })
+  })
 })
diff --git a/frontend/src/components/posts/import/PostImportRowForm.tsx b/frontend/src/components/posts/import/PostImportRowForm.tsx
index 13e24b8..bdf7206 100644
--- a/frontend/src/components/posts/import/PostImportRowForm.tsx
+++ b/frontend/src/components/posts/import/PostImportRowForm.tsx
@@ -10,18 +10,10 @@ import PostThumbnailPreview from '@/components/posts/PostThumbnailPreview'
 
 import type { FC } from 'react'
 
-import type { PostImportRow } from '@/lib/postImportSession'
+import type { PostImportEditableDraft, PostImportRow } from '@/lib/postImportSession'
 import type { DialogueFormControls } from '@/lib/dialogues/useDialogue'
 
-type Draft = {
-  url:                   string
-  title:                 string
-  thumbnailBase:         string
-  originalCreatedFrom:   string
-  originalCreatedBefore: string
-  duration:              string
-  tags:                  string
-  parentPostIds:         string }
+type Draft = PostImportEditableDraft
 
 type Props = {
   row:          PostImportRow
diff --git a/frontend/src/components/posts/import/postImportRowStatus.ts b/frontend/src/components/posts/import/postImportRowStatus.ts
index 03debd5..123ab23 100644
--- a/frontend/src/components/posts/import/postImportRowStatus.ts
+++ b/frontend/src/components/posts/import/postImportRowStatus.ts
@@ -5,7 +5,7 @@ export type PostImportDisplayStatus = 'ready' | 'skipped' | 'warning'
 export type PostImportBadgeValue = PostImportDisplayStatus
 
 const hasWarnings = (row: PostImportRow): boolean =>
-    Object.values (row.fieldWarnings ?? { }).some (_1 => _1.length > 0)
+    Object.values (row.fieldWarnings ?? { }).some (messages => messages.length > 0)
     || row.baseWarnings.length > 0
 
 export const displayPostImportStatus = (
diff --git a/frontend/src/lib/postImportRows.test.ts b/frontend/src/lib/postImportRows.test.ts
index eaaeb65..5f52a5b 100644
--- a/frontend/src/lib/postImportRows.test.ts
+++ b/frontend/src/lib/postImportRows.test.ts
@@ -1,6 +1,7 @@
 import { describe, expect, it } from 'vitest'
 
 import { creatableImportRows,
+	 buildNextEditedRow,
 	 canEditResultRow,
 	 canEditReviewRow,
 	 canRetryResultRow,
@@ -250,4 +251,38 @@ describe ('post import row state', () => {
     expect (initialised.resetSnapshot.attributes.title).toBe ('')
     expect (initialised.resetSnapshot.fieldWarnings.title).toEqual (['warning'])
   })
+
+  it ('builds the next edited row with shared repair semantics', () => {
+    const row = buildPostImportRow ({
+      url: 'https://example.com/original',
+      importStatus: 'failed',
+      recoverable: true,
+      importErrors: { base: ['failed'] },
+      attributes: { title: 'old title', tags: 'old-tag', duration: '2' },
+      provenance: { title: 'automatic', tags: 'automatic', url: 'manual' },
+      tagSources: { automatic: 'old-tag', manual: '' } })
+
+    const nextRow = buildNextEditedRow (
+        row,
+        {
+          url: 'https://example.com/edited',
+          title: 'edited title',
+          thumbnailBase: '',
+          originalCreatedFrom: '',
+          originalCreatedBefore: '',
+          duration: '2.5',
+          tags: 'edited-tag',
+          parentPostIds: '' },
+        true)
+
+    expect (nextRow.importStatus).toBe ('pending')
+    expect (nextRow.importErrors).toBeUndefined ()
+    expect (nextRow.url).toBe ('https://example.com/edited')
+    expect (nextRow.attributes.title).toBe ('edited title')
+    expect (nextRow.attributes.duration).toBe ('2.5')
+    expect (nextRow.attributes.tags).toBe ('edited-tag')
+    expect (nextRow.provenance.title).toBe ('manual')
+    expect (nextRow.provenance.url).toBe ('manual')
+    expect (nextRow.tagSources?.manual).toBe ('edited-tag')
+  })
 })
diff --git a/frontend/src/lib/postImportRows.ts b/frontend/src/lib/postImportRows.ts
index 6946c2e..2b811b0 100644
--- a/frontend/src/lib/postImportRows.ts
+++ b/frontend/src/lib/postImportRows.ts
@@ -1,4 +1,5 @@
-import type { PostImportResultRow,
+import type { PostImportEditableDraft,
+	      PostImportResultRow,
 	      PostImportRow } from '@/lib/postImportTypes'
 
 const hasSkipReason = (row: PostImportRow): boolean =>
@@ -112,6 +113,54 @@ export const resultRowWarnings = (row: PostImportRow): string[] =>
         ...Object.values (row.fieldWarnings ?? { }).flat (),
         ...row.baseWarnings])]
 
+export const buildNextEditedRow = (
+    editingRow:  PostImportRow,
+    draft:       PostImportEditableDraft,
+    urlChanged:  boolean,
+): PostImportRow => {
+    const nextProvenance = { ...editingRow.provenance }
+    const nextAttributes = { ...editingRow.attributes }
+    const nextTagSources = {
+	automatic: editingRow.tagSources?.automatic ?? '',
+	manual: editingRow.tagSources?.manual ?? '' }
+    const draftFields = [
+	['title', draft.title],
+	['thumbnailBase', draft.thumbnailBase],
+	['originalCreatedFrom', draft.originalCreatedFrom],
+	['originalCreatedBefore', draft.originalCreatedBefore],
+	['duration', draft.duration],
+	['parentPostIds', draft.parentPostIds]] as const
+    draftFields.forEach (([field, value]) => {
+	nextAttributes[field] = value
+	nextProvenance[field] =
+	    value !== String (editingRow.attributes[field] ?? '')
+	    ? 'manual'
+	    : (editingRow.provenance[field] ?? 'automatic')
+    })
+    nextAttributes.tags = draft.tags
+    if (draft.tags !== String (editingRow.attributes.tags ?? ''))
+      {
+	nextProvenance.tags = 'manual'
+	nextTagSources.manual = draft.tags
+      }
+    else
+      {
+	nextProvenance.tags = editingRow.provenance.tags ?? 'automatic'
+	nextTagSources.manual = editingRow.tagSources?.manual ?? ''
+      }
+
+    return {
+	...editingRow,
+	url: draft.url,
+	attributes: nextAttributes,
+	provenance: {
+	    ...nextProvenance,
+	    url: urlChanged ? 'manual' : (editingRow.provenance.url ?? 'manual') },
+	tagSources: nextTagSources,
+	importStatus: editingRow.importStatus === 'created' ? 'created' : 'pending',
+	importErrors: undefined }
+}
+
 
 export const hasExactSourceRows = (
     expected: number[],
@@ -121,7 +170,7 @@ export const hasExactSourceRows = (
       return false
 
     const expectedSorted = [...expected].sort ((a, b) => a - b)
-    const actualSorted = actual.map (_1 => _1.sourceRow).sort ((a, b) => a - b)
+    const actualSorted = actual.map (row => row.sourceRow).sort ((a, b) => a - b)
     return expectedSorted.every ((value, index) => value === actualSorted[index])
 }
 
diff --git a/frontend/src/lib/postImportSourceValidation.ts b/frontend/src/lib/postImportSourceValidation.ts
index 1658216..812afd9 100644
--- a/frontend/src/lib/postImportSourceValidation.ts
+++ b/frontend/src/lib/postImportSourceValidation.ts
@@ -40,8 +40,8 @@ const normaliseImportUrl = (value: string): string | null => {
 export const countImportSourceLines = (source: string): number =>
     source
         .split (/\r\n|\n|\r/)
-        .map (_1 => _1.trim ())
-        .filter (_1 => _1 !== '')
+        .map (line => line.trim ())
+        .filter (line => line !== '')
         .length
 
 
diff --git a/frontend/src/lib/postImportStorage.ts b/frontend/src/lib/postImportStorage.ts
index a50f1fd..1fec4a4 100644
--- a/frontend/src/lib/postImportStorage.ts
+++ b/frontend/src/lib/postImportStorage.ts
@@ -96,7 +96,7 @@ const ensureStringListRecord = (value: unknown): Record<string, string[]> | null
     const result: Record<string, string[]> = { }
     for (const [key, entry] of Object.entries (value))
       {
-        if (!(Array.isArray (entry)) || !(entry.every (_1 => typeof _1 === 'string')))
+        if (!(Array.isArray (entry)) || !(entry.every (item => typeof item === 'string')))
           return null
         result[key] = entry
       }
@@ -161,7 +161,7 @@ const sanitiseResetSnapshot = (value: unknown): PostImportResetSnapshot | null =
       return null
     if (!(hasOnlyKeys (value.tagSources, TAG_SOURCE_KEYS)))
       return null
-    if (!(Object.values (value.tagSources).every (_1 => typeof _1 === 'string')))
+    if (!(Object.values (value.tagSources).every (entry => typeof entry === 'string')))
       return null
     const fieldWarnings = ensureStringListRecord (value.fieldWarnings)
     if (fieldWarnings == null)
@@ -169,7 +169,7 @@ const sanitiseResetSnapshot = (value: unknown): PostImportResetSnapshot | null =
     if (!(hasOnlyKeys (fieldWarnings, WARNING_KEYS)))
       return null
     if (!(Array.isArray (value.baseWarnings))
-        || !(value.baseWarnings.every (_1 => typeof _1 === 'string')))
+        || !(value.baseWarnings.every (warning => typeof warning === 'string')))
       return null
     if (value.metadataUrl != null && typeof value.metadataUrl !== 'string')
       return null
@@ -235,7 +235,7 @@ const sanitiseRow = (value: unknown): PostImportRow | null => {
     if (importErrors === null)
       return null
     if (!(Array.isArray (value.baseWarnings))
-        || !(value.baseWarnings.every (_1 => typeof _1 === 'string')))
+        || !(value.baseWarnings.every (warning => typeof warning === 'string')))
       return null
 
     const provenanceEntries = Object.entries (value.provenance)
@@ -255,7 +255,7 @@ const sanitiseRow = (value: unknown): PostImportRow | null => {
           return null
         if (!(hasOnlyKeys (value.tagSources, TAG_SOURCE_KEYS)))
           return null
-        if (!(Object.values (value.tagSources).every (_1 => typeof _1 === 'string')))
+        if (!(Object.values (value.tagSources).every (entry => typeof entry === 'string')))
           return null
       }
 
@@ -401,7 +401,7 @@ export const loadPostImportSession = (
         }
 
       const rows = value.rows.map (sanitiseRow)
-      if (rows.some (_1 => _1 == null))
+      if (rows.some (row => row == null))
         return null
 
       return {
diff --git a/frontend/src/lib/postImportTypes.ts b/frontend/src/lib/postImportTypes.ts
index dec6f9e..814374f 100644
--- a/frontend/src/lib/postImportTypes.ts
+++ b/frontend/src/lib/postImportTypes.ts
@@ -72,4 +72,14 @@ export type PostImportSourceIssue = {
     message:   string
     url:       string }
 
+export type PostImportEditableDraft = {
+    url:                   string
+    title:                 string
+    thumbnailBase:         string
+    originalCreatedFrom:   string
+    originalCreatedBefore: string
+    duration:              string
+    tags:                  string
+    parentPostIds:         string }
+
 export type StorageErrorHandler = (message: string) => void
diff --git a/frontend/src/pages/posts/PostImportResultPage.test.tsx b/frontend/src/pages/posts/PostImportResultPage.test.tsx
index 59b6d5a..0fe7f9a 100644
--- a/frontend/src/pages/posts/PostImportResultPage.test.tsx
+++ b/frontend/src/pages/posts/PostImportResultPage.test.tsx
@@ -263,7 +263,7 @@ describe ('PostImportResultPage', () => {
       fireEvent.change (screen.getByDisplayValue ('old title'), {
         target: { value: 'edited title' } })
       await act (async () => {
-        await actions.find (_1 => _1.label === '編輯内容を保存')?.onSelect ()
+        await actions.find (action => action.label === '編輯内容を保存')?.onSelect ()
       })
     })
 
diff --git a/frontend/src/pages/posts/PostImportResultPage.tsx b/frontend/src/pages/posts/PostImportResultPage.tsx
index 499a74a..7521565 100644
--- a/frontend/src/pages/posts/PostImportResultPage.tsx
+++ b/frontend/src/pages/posts/PostImportResultPage.tsx
@@ -17,6 +17,7 @@ import { apiPost } from '@/lib/api'
 import useDialogue from '@/lib/dialogues/useDialogue'
 import { canEditContent } from '@/lib/users'
 import { clearPostImportSourceDraft,
+	 buildNextEditedRow,
 	 canEditResultRow,
 	 canRetryResultRow,
 	 hasExactSourceRows,
@@ -43,54 +44,6 @@ import type { User } from '@/types'
 
 type Props = { user: User | null }
 
-const buildNextEditedRow = (
-    editingRow:  PostImportRow,
-    draft:       PostImportRowDraft,
-    urlChanged:  boolean,
-): PostImportRow => {
-    const nextProvenance = { ...editingRow.provenance }
-    const nextAttributes = { ...editingRow.attributes }
-    const nextTagSources = {
-	automatic: editingRow.tagSources?.automatic ?? '',
-	manual: editingRow.tagSources?.manual ?? '' }
-    const draftFields = [
-	['title', draft.title],
-	['thumbnailBase', draft.thumbnailBase],
-	['originalCreatedFrom', draft.originalCreatedFrom],
-	['originalCreatedBefore', draft.originalCreatedBefore],
-	['duration', draft.duration],
-	['parentPostIds', draft.parentPostIds]] as const
-    draftFields.forEach (([field, value]) => {
-	nextAttributes[field] = value
-	nextProvenance[field] =
-	    value !== String (editingRow.attributes[field] ?? '')
-	    ? 'manual'
-	    : (editingRow.provenance[field] ?? 'automatic')
-    })
-    nextAttributes.tags = draft.tags
-    if (draft.tags !== String (editingRow.attributes.tags ?? ''))
-      {
-	nextProvenance.tags = 'manual'
-	nextTagSources.manual = draft.tags
-      }
-    else
-      {
-	nextProvenance.tags = editingRow.provenance.tags ?? 'automatic'
-	nextTagSources.manual = editingRow.tagSources?.manual ?? ''
-      }
-
-    return {
-	...editingRow,
-	url: draft.url,
-	attributes: nextAttributes,
-	provenance: {
-	    ...nextProvenance,
-	    url: urlChanged ? 'manual' : (editingRow.provenance.url ?? 'manual') },
-	tagSources: nextTagSources,
-	importStatus: editingRow.importStatus === 'created' ? 'created' : 'pending',
-	importErrors: undefined }
-}
-
 
 const PostImportResultPage: FC<Props> = ({ user }) => {
   const editable = canEditContent (user)
@@ -186,7 +139,8 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
 			      metadataUrl: row.metadataUrl })),
 	  changed_row: urlChanged ? baseRow.sourceRow : -1 })
       const validatedRows = initialisePreviewRows (validated.rows)
-      const target = validatedRows.find (_1 => _1.sourceRow === baseRow.sourceRow)
+      const target = validatedRows.find (
+          validatedRow => validatedRow.sourceRow === baseRow.sourceRow)
       const latestSession = sessionRef.current
       if (latestSession == null)
         return { saved: false, row: null }
@@ -211,7 +165,9 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
       sessionRef.current = nextSession
       setSession (nextSession)
       persistSession (nextSession)
-      const mergedTarget = rows.find (_1 => _1.sourceRow === baseRow.sourceRow) ?? target
+      const mergedTarget =
+          rows.find (mergedRow => mergedRow.sourceRow === baseRow.sourceRow)
+          ?? target
       if (Object.keys (mergedTarget.validationErrors).length > 0)
         return { saved: false, row: mergedTarget }
       return { saved: true, row: null }
@@ -267,7 +223,7 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
       return
 
     setLoadingRow (sourceRow)
-    const originalRow = initialSession.rows.find (_1 => _1.sourceRow === sourceRow)
+    const originalRow = initialSession.rows.find (row => row.sourceRow === sourceRow)
     if (originalRow == null)
       {
         setLoadingRow (null)
@@ -305,7 +261,8 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
           toast ({ title: '再検証結果が不完全でした' })
           return
         }
-      const validatedTarget = validatedRows.find (_1 => _1.sourceRow === sourceRow)
+      const validatedTarget = validatedRows.find (
+          row => row.sourceRow === sourceRow)
       if (validatedTarget == null)
         {
           const latest = sessionRef.current ?? pendingSession
@@ -331,7 +288,7 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
       sessionRef.current = nextSession
       setSession (nextSession)
       persistSession (nextSession)
-      const target = mergedValidatedRows.find (_1 => _1.sourceRow === sourceRow)
+      const target = mergedValidatedRows.find (row => row.sourceRow === sourceRow)
       if (target == null)
         {
           const restoredRows = replaceImportRow (latestAfterValidate.rows, originalRow)
@@ -387,7 +344,8 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
           && row.recoverable
           && Object.keys (row.errors ?? { }).length > 0)
       const nextRows = mergedRows.map ((row): PostImportRow => {
-        const recoverable = recoverableRows.find (_1 => _1.sourceRow === row.sourceRow)
+        const recoverable = recoverableRows.find (
+            recoverableRow => recoverableRow.sourceRow === row.sourceRow)
         if (recoverable == null)
           return row
         return {
@@ -397,7 +355,7 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
             validationErrors: recoverable.errors ?? { },
             importErrors: undefined }
       })
-      const recoverableTarget = nextRows.find (_1 => _1.sourceRow === sourceRow)
+      const recoverableTarget = nextRows.find (row => row.sourceRow === sourceRow)
       const resultSession = {
           ...nextSession,
           rows: nextRows,
@@ -449,7 +407,7 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
 	toast ({ title: '取込状態を保存できませんでした', description: message }))
     if (!(saved))
       return
-    const row = nextSession.rows.find (_1 => _1.sourceRow === sourceRow)
+    const row = nextSession.rows.find (rowValue => rowValue.sourceRow === sourceRow)
     if (row != null)
       void editRow (row)
   }
diff --git a/frontend/src/pages/posts/PostImportReviewPage.test.tsx b/frontend/src/pages/posts/PostImportReviewPage.test.tsx
index 808f828..de16bca 100644
--- a/frontend/src/pages/posts/PostImportReviewPage.test.tsx
+++ b/frontend/src/pages/posts/PostImportReviewPage.test.tsx
@@ -3,11 +3,12 @@ import { HelmetProvider } from 'react-helmet-async'
 import { MemoryRouter, Route, Routes } from 'react-router-dom'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
-import { savePostImportSession } from '@/lib/postImportSession'
+import { loadPostImportSession, savePostImportSession } from '@/lib/postImportSession'
 import PostImportReviewPage from '@/pages/posts/PostImportReviewPage'
 import { buildUser } from '@/test/factories'
 import { buildPostImportRow } from '@/test/postImportFactories'
 
+import type { DialogueFormAction, DialogueFormControls } from '@/lib/dialogues/useDialogue'
 import type { PostImportRow } from '@/lib/postImportSession'
 
 const api = vi.hoisted (() => ({
@@ -178,4 +179,82 @@ describe ('PostImportReviewPage', () => {
     })
     expect (screen.queryByText ('RESULT ROUTE')).not.toBeInTheDocument ()
   })
+
+  it ('keeps edited recoverable rows in session before the next batch submit', async () => {
+    savePostImportSession ('review-edit-retry', {
+      source: 'https://example.com/post',
+      repairMode: 'failed',
+      rows: [buildPostImportRow ({
+        sourceRow: 1,
+        attributes: { title: 'old title' },
+        importStatus: 'failed',
+        recoverable: true,
+        importErrors: { base: ['failed'] } })] })
+    api.apiPost
+        .mockResolvedValueOnce ({
+          rows: [buildPostImportRow ({
+            sourceRow: 1,
+            attributes: { title: 'edited title' },
+            importStatus: 'pending',
+            recoverable: true })] })
+        .mockResolvedValueOnce ({
+          rows: [buildPostImportRow ({
+            sourceRow: 1,
+            attributes: { title: 'edited title' },
+            importStatus: 'pending',
+            recoverable: true })] })
+        .mockResolvedValueOnce ({
+          created: 0,
+          skipped: 0,
+          failed: 1,
+          rows: [{
+            sourceRow: 1,
+            status: 'failed',
+            recoverable: true,
+            errors: { title: ['invalid'] } }] })
+    dialogue.form.mockImplementationOnce (async options => {
+      let actions: DialogueFormAction[] = []
+      const controls: DialogueFormControls = {
+        close: vi.fn (),
+        confirm: vi.fn (),
+        setActions: next => {
+          actions = next
+        } }
+
+      render (options.body (controls))
+      await waitFor (() => expect (actions.length).toBe (2))
+      fireEvent.change (screen.getByDisplayValue ('old title'), {
+        target: { value: 'edited title' } })
+      await actions.find (action => action.label === '編輯内容を保存')?.onSelect ()
+    })
+
+    render (
+        <HelmetProvider>
+          <MemoryRouter initialEntries={['/posts/import/review-edit-retry/review']}>
+            <Routes>
+              <Route
+                  path="/posts/import/:sessionId/review"
+                  element={<PostImportReviewPage user={buildUser ()}/>}/>
+              <Route
+                  path="/posts/import/:sessionId/result"
+                  element={<div>RESULT ROUTE</div>}/>
+            </Routes>
+          </MemoryRouter>
+        </HelmetProvider>)
+
+    fireEvent.click (screen.getByRole ('button', { name: '編輯' }))
+
+    await waitFor (() => {
+      const saved = loadPostImportSession ('review-edit-retry')
+      expect (saved?.rows[0]?.attributes.title).toBe ('edited title')
+      expect (saved?.rows[0]?.importStatus).toBe ('pending')
+    })
+
+    fireEvent.click (screen.getByRole ('button', { name: '取込実行' }))
+
+    await waitFor (() => {
+      expect (api.apiPost.mock.calls[1]?.[1]?.rows?.[0]?.attributes?.title)
+          .toBe ('edited title')
+    })
+  })
 })
diff --git a/frontend/src/pages/posts/PostImportReviewPage.tsx b/frontend/src/pages/posts/PostImportReviewPage.tsx
index 0eb8faf..fce3b22 100644
--- a/frontend/src/pages/posts/PostImportReviewPage.tsx
+++ b/frontend/src/pages/posts/PostImportReviewPage.tsx
@@ -13,6 +13,7 @@ import { apiPost } from '@/lib/api'
 import useDialogue from '@/lib/dialogues/useDialogue'
 import { canEditContent } from '@/lib/users'
 import { loadPostImportSession,
+	 buildNextEditedRow,
 	 canEditReviewRow,
 	 creatableImportRows,
 	 hasExactSourceRows,
@@ -145,7 +146,8 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 			      metadataUrl: row.metadataUrl })),
 	  changed_row: urlChanged ? baseRow.sourceRow : -1 })
       const validatedRows = initialisePreviewRows (validated.rows)
-      const target = validatedRows.find (_1 => _1.sourceRow === baseRow.sourceRow)
+      const target = validatedRows.find (
+          validatedRow => validatedRow.sourceRow === baseRow.sourceRow)
       const latestSession = sessionRef.current
       if (latestSession == null)
         return { saved: false, row: null }
@@ -161,14 +163,17 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
           toast ({ title: '行の再検証結果が不完全でした' })
           return { saved: false, row: null }
         }
-      const rows = mergeValidatedImportRow (latestSession.rows, target)
+      const editedRows = replaceImportRow (latestSession.rows, nextRow)
+      const rows = mergeValidatedImportRow (editedRows, target)
       const nextSession = {
           ...latestSession,
           rows,
           repairMode: resultRepairMode (rows) }
       sessionRef.current = nextSession
       setSession (nextSession)
-      const mergedTarget = rows.find (_1 => _1.sourceRow === baseRow.sourceRow) ?? target
+      const mergedTarget =
+          rows.find (mergedRow => mergedRow.sourceRow === baseRow.sourceRow)
+          ?? target
       if (Object.keys (mergedTarget.validationErrors).length > 0)
         return { saved: false, row: mergedTarget }
       return { saved: true, row: null }
@@ -411,52 +416,4 @@ const PostImportFooter = (
       </div>
     </div>)
 
-const buildNextEditedRow = (
-    editingRow:  PostImportRow,
-    draft:       PostImportRowDraft,
-    urlChanged:  boolean,
-): PostImportRow => {
-    const nextProvenance = { ...editingRow.provenance }
-    const nextAttributes = { ...editingRow.attributes }
-    const nextTagSources = {
-	automatic: editingRow.tagSources?.automatic ?? '',
-	manual: editingRow.tagSources?.manual ?? '' }
-    const draftFields = [
-	['title', draft.title],
-	['thumbnailBase', draft.thumbnailBase],
-	['originalCreatedFrom', draft.originalCreatedFrom],
-	['originalCreatedBefore', draft.originalCreatedBefore],
-	['duration', draft.duration],
-	['parentPostIds', draft.parentPostIds]] as const
-    draftFields.forEach (([field, value]) => {
-	nextAttributes[field] = value
-	nextProvenance[field] =
-	    value !== String (editingRow.attributes[field] ?? '')
-	    ? 'manual'
-	    : (editingRow.provenance[field] ?? 'automatic')
-    })
-    nextAttributes.tags = draft.tags
-    if (draft.tags !== String (editingRow.attributes.tags ?? ''))
-      {
-	nextProvenance.tags = 'manual'
-	nextTagSources.manual = draft.tags
-      }
-    else
-      {
-	nextProvenance.tags = editingRow.provenance.tags ?? 'automatic'
-	nextTagSources.manual = editingRow.tagSources?.manual ?? ''
-      }
-
-    return {
-	...editingRow,
-	url: draft.url,
-	attributes: nextAttributes,
-	provenance: {
-	    ...nextProvenance,
-	    url: urlChanged ? 'manual' : (editingRow.provenance.url ?? 'manual') },
-	tagSources: nextTagSources,
-	importStatus: editingRow.importStatus === 'created' ? 'created' : 'pending',
-	importErrors: undefined }
-}
-
 export default PostImportReviewPage
diff --git a/frontend/src/pages/posts/PostImportSourcePage.test.tsx b/frontend/src/pages/posts/PostImportSourcePage.test.tsx
index a8d5af5..f38eb57 100644
--- a/frontend/src/pages/posts/PostImportSourcePage.test.tsx
+++ b/frontend/src/pages/posts/PostImportSourcePage.test.tsx
@@ -86,7 +86,8 @@ describe ('PostImportSourcePage', () => {
 	  expect.stringMatching (/^\/posts\/import\/[^/]+\/review$/))
     })
     const sessionKeys = Array.from ({ length: sessionStorage.length }, (_, index) =>
-	sessionStorage.key (index)).filter (_1 => _1?.startsWith ('post-import-session:'))
+	sessionStorage.key (index)).filter (
+	    key => key?.startsWith ('post-import-session:'))
     expect (sessionKeys).toHaveLength (1)
   })
 })
diff --git a/frontend/src/pages/posts/PostImportSourcePage.tsx b/frontend/src/pages/posts/PostImportSourcePage.tsx
index 8015b72..a5a8823 100644
--- a/frontend/src/pages/posts/PostImportSourcePage.tsx
+++ b/frontend/src/pages/posts/PostImportSourcePage.tsx
@@ -60,7 +60,7 @@ const PostImportSourcePage: FC<Props> = ({ user }) => {
   const sourceDescribedBy =
       [sourceError != null ? SOURCE_ERROR_ID : null,
        sourceIssues.length > 0 ? SOURCE_ISSUES_ID : null]
-      .filter (_1 => _1 != null)
+      .filter (value => value != null)
       .join (' ')
 
   useEffect (() => {
diff --git a/frontend/src/pages/posts/PostNewPage.test.tsx b/frontend/src/pages/posts/PostNewPage.test.tsx
index 61fecc2..31e8151 100644
--- a/frontend/src/pages/posts/PostNewPage.test.tsx
+++ b/frontend/src/pages/posts/PostNewPage.test.tsx
@@ -1,8 +1,7 @@
-import { readFileSync } from 'node:fs'
-
 import { fireEvent, screen, waitFor } from '@testing-library/react'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
+import { toMinutePrecisionIsoUtc } from '@/components/common/DateTimeField'
 import PostNewPage from '@/pages/posts/PostNewPage'
 import { buildUser } from '@/test/factories'
 import { renderWithProviders } from '@/test/render'
@@ -108,15 +107,31 @@ describe ('PostNewPage', () => {
     expect (screen.getAllByRole ('textbox')[4]).toHaveAttribute ('aria-invalid', 'true')
   })
 
-  it ('shares the common post field components with the import form', () => {
-    const newPage = readFileSync ('src/pages/posts/PostNewPage.tsx', 'utf8')
-    const importForm = readFileSync ('src/components/posts/import/PostImportRowForm.tsx', 'utf8')
+  it ('uses the shared duration, tags, and datetime value contract for post submission', async () => {
+    api.apiPost.mockResolvedValueOnce ({})
+    api.apiGet.mockResolvedValue ([])
 
-    expect (newPage).toContain ("@/components/posts/PostTextField")
-    expect (newPage).toContain ("@/components/posts/PostDurationField")
-    expect (newPage).toContain ("@/components/posts/PostTagsField")
-    expect (importForm).toContain ("@/components/posts/PostTextField")
-    expect (importForm).toContain ("@/components/posts/PostDurationField")
-    expect (importForm).toContain ("@/components/posts/PostTagsField")
+    const { container } = renderWithProviders (<PostNewPage user={buildUser ({ role: 'member' })}/>)
+
+    const textboxes = screen.getAllByRole ('textbox')
+    fireEvent.change (textboxes[0], { target: { value: 'https://example.com/post' } })
+    fireEvent.change (textboxes[1], { target: { value: '投稿タイトル' } })
+    fireEvent.change (textboxes[4], { target: { value: '動画 tag1 tag2' } })
+    fireEvent.change (
+        screen.getByPlaceholderText ('例: 2 / 2.5 / 1:23'),
+        { target: { value: '2.5' } })
+    const datetimeInputs = container.querySelectorAll ('input[type="datetime-local"]')
+    fireEvent.change (datetimeInputs[0] as HTMLInputElement, {
+      target: { value: '2024-01-01T12:34' } })
+    fireEvent.click (screen.getByRole ('button', { name: '追加' }))
+
+    await waitFor (() => expect (api.apiPost).toHaveBeenCalled ())
+
+    const formData = api.apiPost.mock.calls[0]?.[1] as FormData
+    expect (container.querySelector ('input[type="file"]')).not.toBeNull ()
+    expect (formData.get ('duration')).toBe ('2.5')
+    expect (formData.get ('tags')).toBe ('動画 tag1 tag2')
+    expect (formData.get ('original_created_from')).toBe (
+        toMinutePrecisionIsoUtc ('2024-01-01T12:34'))
   })
 })