feat(ingest): Recapture mode — re-grab post bodies/links + localize on-disk inline images (#830)

A plain backfill gates post-body capture on the seen-ledger, so a post whose
media is already on disk AND whose post key is already seen never gets its body
recaptured (operator-flagged: Industrial Lust description missing). Recovery
recaptures unconditionally but re-downloads the whole source.

New 'recapture' walk mode (4th beside tick/backfill/recovery): bypasses the
post-record gate so EVERY post's body + external links are re-captured
(detail-fetching empty bodies) WITHOUT re-downloading on-disk media; and
surfaces already-present media via a separate non-deleting relink channel so the
importer backfills ImageRecord.source_filehash for inline-image localization.

- ingest_core: recapture mode + recapture_records gate bypass + relink collect
- patreon_downloader: recapture surfaces seen-on-disk as skipped_disk(path),
  never refetches seen-missing media, still downloads genuinely-new
- importer.relink_source_filehash: NULL-only sha256 backfill, never unlinks
- download_service: mode derivation + phase-3 relink loop + lifecycle clear
- source_service/api: start_recapture + backfill_recapture field + action
- frontend: Recapture kebab action + 'Recapturing' badge across SourceActions/
  Row/Card/SubscriptionsTab + sources store
- tests across ingester/downloader/importer/source_service/api/download_service

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/subscriptions/SourceActions.vue

@@ -21,7 +21,7 @@
       <v-icon>{{ running ? 'mdi-stop' : 'mdi-magnify-scan' }}</v-icon>
       <v-tooltip activator="parent" location="top">
         {{ running
-          ? (recovering ? 'Stop recovery' : 'Stop backfill')
+          ? (recovering ? 'Stop recovery' : (recapturing ? 'Stop recapture' : 'Stop backfill'))
           : 'Backfill — one-time walk of the FULL post history until complete' }}
       </v-tooltip>
     </v-btn>
@@ -38,6 +38,17 @@
           under the current similarity threshold
         </v-list-item-subtitle>
       </v-list-item>
+      <v-list-item
+        v-if="isPatreon && !running"
+        prepend-icon="mdi-text-box-search-outline"
+        @click="emit('recapture', source)"
+      >
+        <v-list-item-title>Recapture post text &amp; links</v-list-item-title>
+        <v-list-item-subtitle>
+          Re-grab every post's body + external links and localize inline images
+          already on disk — without re-downloading media
+        </v-list-item-subtitle>
+      </v-list-item>
       <v-divider v-if="isPatreon && !running" />
       <v-list-item
         base-color="error"
@@ -58,10 +69,11 @@ const props = defineProps({
   source: { type: Object, required: true },
   checking: { type: Boolean, default: false },
 })
-const emit = defineEmits(['check', 'backfill', 'recover', 'remove'])
+const emit = defineEmits(['check', 'backfill', 'recover', 'recapture', 'remove'])
 
 const running = computed(() => props.source.backfill_state === 'running')
 const recovering = computed(() => !!props.source.backfill_bypass_seen)
+const recapturing = computed(() => !!props.source.backfill_recapture)
 const isPatreon = computed(() => props.source.platform === 'patreon')
 </script>
 

frontend/src/components/subscriptions/SourceCard.vue

@@ -40,7 +40,7 @@
       <v-chip
         v-else-if="source.backfill_state === 'running'"
         size="x-small" color="info" variant="tonal" label
-      >{{ source.backfill_bypass_seen ? 'Recovering' : 'Backfilling'
+      >{{ source.backfill_bypass_seen ? 'Recovering' : (source.backfill_recapture ? 'Recapturing' : 'Backfilling')
         }}{{ source.backfill_posts
               ? ` · ${source.backfill_posts} posts`
               : (source.backfill_chunks ? ` (${source.backfill_chunks})` : '') }}</v-chip>
@@ -60,6 +60,7 @@
         @check="$emit('check', $event)"
         @backfill="$emit('backfill', $event)"
         @recover="$emit('recover', $event)"
+        @recapture="$emit('recapture', $event)"
         @remove="$emit('remove', $event)"
       />
     </div>
@@ -79,7 +80,7 @@ const props = defineProps({
   checking: { type: Boolean, default: false },
   warningThreshold: { type: Number, default: 5 },
 })
-const emit = defineEmits(['edit', 'remove', 'toggle', 'check', 'backfill', 'recover'])
+const emit = defineEmits(['edit', 'remove', 'toggle', 'check', 'backfill', 'recover', 'recapture'])
 
 function onToggleEnabled(value) {
   emit('toggle', { source: props.source, enabled: value })

frontend/src/components/subscriptions/SourceRow.vue

@@ -51,7 +51,7 @@
       <v-chip
         v-else-if="source.backfill_state === 'running'"
         size="x-small" color="info" variant="tonal" label
-      >{{ source.backfill_bypass_seen ? 'Recovering' : 'Backfilling'
+      >{{ source.backfill_bypass_seen ? 'Recovering' : (source.backfill_recapture ? 'Recapturing' : 'Backfilling')
         }}{{ source.backfill_posts
               ? ` · ${source.backfill_posts} posts`
               : (source.backfill_chunks ? ` (${source.backfill_chunks})` : '') }}</v-chip>
@@ -71,6 +71,7 @@
         @check="$emit('check', $event)"
         @backfill="$emit('backfill', $event)"
         @recover="$emit('recover', $event)"
+        @recapture="$emit('recapture', $event)"
         @remove="$emit('remove', $event)"
       />
     </td>
@@ -87,7 +88,7 @@ const props = defineProps({
   checking: { type: Boolean, default: false },
   warningThreshold: { type: Number, default: 5 },
 })
-const emit = defineEmits(['edit', 'remove', 'toggle', 'check', 'backfill', 'recover'])
+const emit = defineEmits(['edit', 'remove', 'toggle', 'check', 'backfill', 'recover', 'recapture'])
 
 function onToggleEnabled(value) {
   emit('toggle', { source: props.source, enabled: value })

frontend/src/components/subscriptions/SubscriptionsTab.vue

@@ -138,7 +138,7 @@
               :source="item.singleSource"
               :checking="store.checkingIds.has(item.singleSource.id)"
               @check="onCheck" @backfill="onBackfill"
-              @recover="onRecover" @remove="removeSource"
+              @recover="onRecover" @recapture="onRecapture" @remove="removeSource"
             />
             <v-btn icon size="small" variant="text" @click.stop="openEditSource(item.singleSource)">
               <v-icon>mdi-pencil</v-icon>
@@ -214,6 +214,7 @@
                     @check="onCheck"
                     @backfill="onBackfill"
                     @recover="onRecover"
+                    @recapture="onRecapture"
                   />
                   <tr v-if="item.sources.length === 0">
                     <td colspan="8" class="fc-subs__sources-empty">
@@ -291,6 +292,7 @@
             @check="onCheck"
             @backfill="onBackfill"
             @recover="onRecover"
+            @recapture="onRecapture"
           />
           <div v-if="item.sources.length === 0" class="fc-subs__sources-empty">
             No sources yet. Tap + to add one.
@@ -646,6 +648,22 @@ async function onRecover(source) {
   }
 }
 
+// #830: arm a recapture walk (Patreon-only) — re-grab every post's body +
+// external links and localize on-disk inline images, without re-downloading
+// media. Reuses the backfill lifecycle/badge; stop via the same Stop control.
+async function onRecapture(source) {
+  try {
+    await store.recaptureSource(source.id, source.artist_id)
+    toast({ text: `Recapture started for ${source.artist_name}`, type: 'success' })
+    // recaptureSource patches the source in place — no full reload.
+  } catch (e) {
+    toast({
+      text: `Recapture start failed: ${e?.body?.detail || e?.message || e}`,
+      type: 'error',
+    })
+  }
+}
+
 async function checkAll(group) {
   let ok = 0
   let conflict = 0

frontend/src/stores/sources.js

@@ -131,6 +131,14 @@ export const useSourcesStore = defineStore('sources', () => {
     _patchSource(body)
     return body
   }
+  // #830: arm a recapture walk (Patreon-only) — re-grab every post's body +
+  // external links and localize on-disk inline images, WITHOUT re-downloading
+  // media. Shares the backfill lifecycle/badge; stop via stopBackfill.
+  async function recaptureSource(id, artistIdHint = null) {
+    const body = await api.post(`/api/sources/${id}/backfill`, { body: { action: 'recapture' } })
+    _patchSource(body)
+    return body
+  }
 
   // Plan #708 B4: dry-run preview — count what a backfill WOULD download
   // (native platforms), without downloading. Read-only, so no cache invalidate.
@@ -167,6 +175,7 @@ export const useSourcesStore = defineStore('sources', () => {
     startBackfill,
     stopBackfill,
     recoverSource,
+    recaptureSource,
     previewSource,
     findOrCreateArtist, autocompleteArtist,
     loadScheduleStatus,