refactor(I5): remove one-and-done GS/IR migration tooling

The GS/IR migration cutover is complete, so the runbook tooling is dead
weight. Removed:
- services/migrators/ (gs_ingest, ir_ingest, tag_apply, ml_queue, verify,
  cleanup), tasks/migration.py, api/migrate.py (+ blueprint registration)
- MigrationRun model; alembic 0027 drops the migration_run table
- frontend LegacyMigrationCard + migration store (+ MaintenancePanel ref)
- celery include + task route + celery_signals queue mapping for migration.*
- the 1 GB MAX_CONTENT_LENGTH / MAX_FORM_MEMORY override (added solely for
  the ir_ingest upload)
- migration-surface tests (test_api_migrate, test_migration_verify,
  test_ir_ingest, test_gs_ingest, test_tag_apply)

Kept: the alembic schema-migration tests (test_migration_00XX — unrelated)
and cleanup_service.py (the permanent artist-cascade/unlink home).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/src/components/settings/LegacyMigrationCard.vue

@@ -1,245 +0,0 @@
-<template>
-  <v-card>
-    <v-card-title>Legacy migration</v-card-title>
-    <v-card-text>
-      <p class="text-body-2 mb-3">
-        Migrate existing ImageRepo and GallerySubscriber data into FabledCurator.
-        Each app produces a JSON export file via a small script in its own repo
-        (<code>scripts/export_for_fabledcurator.py</code>); upload both files
-        here and run the steps in order.
-      </p>
-
-      <ol class="text-body-2 mb-3 fc-migrate__hints">
-        <li>Backup FC (creates a pre-migration snapshot).</li>
-        <li>Upload + ingest GS export.</li>
-        <li>Upload + ingest IR export.</li>
-        <li>Switch to <strong>Import tab</strong> → trigger the existing FC filesystem scan over the bind-mounted IR images dir.</li>
-        <li>Return here → apply IR tag associations (joins by sha256).</li>
-        <li>Queue ML re-processing.</li>
-        <li>Verify.</li>
-      </ol>
-
-      <div class="fc-migrate__uploads">
-        <v-file-input
-          v-model="gsFile"
-          label="GallerySubscriber export (gs-export.json)"
-          accept="application/json,.json"
-          density="compact"
-          show-size
-          prepend-icon="mdi-upload"
-        />
-        <v-file-input
-          v-model="irFile"
-          label="ImageRepo export (ir-export.json)"
-          accept="application/json,.json"
-          density="compact"
-          show-size
-          prepend-icon="mdi-upload"
-        />
-      </div>
-
-      <div class="fc-migrate__steps mt-3">
-        <v-btn
-          color="accent" variant="tonal" prepend-icon="mdi-content-save"
-          :disabled="store.isRunning"
-          @click="onBackup"
-        >1. Backup FC</v-btn>
-        <v-btn
-          color="primary" variant="tonal" prepend-icon="mdi-database-arrow-right"
-          :disabled="store.isRunning || !gsFile"
-          @click="onIngestGs"
-        >2. Ingest GS</v-btn>
-        <v-btn
-          color="primary" variant="tonal" prepend-icon="mdi-database-arrow-right"
-          :disabled="store.isRunning || !irFile"
-          @click="onIngestIr"
-        >3. Ingest IR</v-btn>
-        <v-btn
-          color="primary" variant="tonal" prepend-icon="mdi-tag-multiple"
-          :disabled="store.isRunning"
-          @click="onTagApply"
-        >5. Apply IR tags</v-btn>
-        <v-btn
-          variant="outlined" prepend-icon="mdi-brain"
-          :disabled="store.isRunning"
-          @click="onMlQueue"
-        >6. Queue ML</v-btn>
-        <v-btn
-          variant="outlined" prepend-icon="mdi-check-circle"
-          :disabled="store.isRunning"
-          @click="onVerify"
-        >7. Verify</v-btn>
-      </div>
-
-      <v-btn
-        color="error" variant="outlined" prepend-icon="mdi-restore" class="mt-3"
-        :disabled="store.isRunning"
-        @click="onRollback"
-      >Rollback to pre-migration backup</v-btn>
-
-      <v-alert v-if="store.error" type="error" variant="tonal" class="mt-3" closable>
-        {{ String(store.error) }}
-      </v-alert>
-
-      <v-card v-if="store.activeRun" variant="outlined" class="mt-4">
-        <v-card-text>
-          <div class="text-subtitle-2">
-            #{{ store.activeRun.id }} — {{ store.activeRun.kind }}
-            ({{ store.activeRun.status }})
-          </div>
-          <v-progress-linear
-            v-if="store.isRunning" indeterminate color="accent" class="my-2"
-          />
-          <div class="text-caption">
-            Rows: {{ store.activeRun.counts.rows_processed || 0 }} processed,
-            {{ store.activeRun.counts.rows_inserted || 0 }} inserted,
-            {{ store.activeRun.counts.rows_skipped || 0 }} skipped.
-            Conflicts: {{ store.activeRun.counts.conflicts || 0 }}.
-          </div>
-          <div v-if="store.activeRun.error" class="text-error mt-1">
-            {{ store.activeRun.error }}
-          </div>
-        </v-card-text>
-      </v-card>
-
-      <div v-if="store.recentRuns.length" class="mt-4">
-        <div class="text-subtitle-2 mb-2">Recent runs</div>
-        <ul class="fc-migrate__history">
-          <li v-for="r in store.recentRuns" :key="r.id">
-            #{{ r.id }} {{ r.kind }}
-            <v-chip
-              size="x-small"
-              :color="r.status === 'ok' ? 'success' : (r.status === 'error' ? 'error' : undefined)"
-            >{{ r.status }}</v-chip>
-            <span class="text-caption fc-migrate__when">{{ r.started_at }}</span>
-          </li>
-        </ul>
-      </div>
-    </v-card-text>
-
-    <v-dialog v-model="confirmOpen" max-width="520">
-      <v-card>
-        <v-card-title>Confirm {{ pendingLabel }}</v-card-title>
-        <v-card-text>
-          This will modify FC's database. Make sure you've taken a backup first.
-          Continue?
-        </v-card-text>
-        <v-card-actions>
-          <v-spacer />
-          <v-btn variant="text" @click="confirmOpen = false">Cancel</v-btn>
-          <v-btn color="primary" variant="tonal" @click="onConfirm">Continue</v-btn>
-        </v-card-actions>
-      </v-card>
-    </v-dialog>
-  </v-card>
-</template>
-
-<script setup>
-import { onMounted, ref } from 'vue'
-import { useMigrationStore } from '../../stores/migration.js'
-
-const store = useMigrationStore()
-
-const gsFile = ref(null)
-const irFile = ref(null)
-
-const confirmOpen = ref(false)
-const pendingLabel = ref('')
-const pendingAction = ref(null)
-
-onMounted(async () => {
-  await store.loadRecent()
-})
-
-function _pick(model) {
-  if (!model) return null
-  // v-file-input v-model can be a single File or a [File] depending on Vuetify version.
-  return Array.isArray(model) ? model[0] : model
-}
-
-function requestConfirm(label, action) {
-  pendingLabel.value = label
-  pendingAction.value = action
-  confirmOpen.value = true
-}
-
-async function onConfirm() {
-  confirmOpen.value = false
-  const action = pendingAction.value
-  pendingAction.value = null
-  if (action) await action()
-}
-
-async function onBackup() {
-  await store.trigger('backup', { tag: 'pre_migration' })
-}
-
-async function onIngestGs() {
-  const file = _pick(gsFile.value)
-  if (!file) return
-  requestConfirm('Ingest GS', async () => {
-    await store.trigger('gs_ingest', { dry_run: false }, file)
-  })
-}
-
-async function onIngestIr() {
-  const file = _pick(irFile.value)
-  if (!file) return
-  requestConfirm('Ingest IR', async () => {
-    await store.trigger('ir_ingest', { dry_run: false }, file)
-  })
-}
-
-async function onTagApply() {
-  requestConfirm('Apply IR tag associations', async () => {
-    await store.trigger('tag_apply', { dry_run: false })
-  })
-}
-
-async function onMlQueue() {
-  await store.trigger('ml_queue', {})
-}
-
-async function onVerify() {
-  await store.trigger('verify', {})
-}
-
-async function onRollback() {
-  requestConfirm('Rollback to pre-migration backup', async () => {
-    await store.trigger('rollback', {})
-  })
-}
-</script>
-
-<style scoped>
-.fc-migrate__hints {
-  padding-left: 1.2rem;
-  color: rgb(var(--v-theme-on-surface-variant));
-}
-.fc-migrate__uploads {
-  display: grid;
-  grid-template-columns: 1fr 1fr;
-  gap: 12px;
-}
-.fc-migrate__steps {
-  display: flex;
-  flex-wrap: wrap;
-  gap: 8px;
-}
-.fc-migrate__history {
-  list-style: none;
-  padding: 0;
-  margin: 0;
-}
-.fc-migrate__history li {
-  display: flex;
-  align-items: center;
-  gap: 8px;
-  padding: 4px 0;
-  border-bottom: 1px solid rgb(var(--v-theme-on-surface-variant), 0.15);
-}
-.fc-migrate__when {
-  color: rgb(var(--v-theme-on-surface-variant));
-  margin-left: auto;
-}
-</style>

frontend/src/components/settings/MaintenancePanel.vue

@@ -17,8 +17,8 @@
     <BackupCard class="mt-6" />
     <!-- TagMaintenanceCard moved to Cleanup tab (v26.05.25.7) — it
          operates on the existing library which fits the Cleanup-tab
-         theme, and clusters with the other audit cards. -->
-    <LegacyMigrationCard class="mt-6" />
+         theme, and clusters with the other audit cards. LegacyMigrationCard
+         removed once the one-and-done GS/IR migration cutover completed. -->
   </div>
 </template>
 
@@ -32,7 +32,6 @@ import MLThresholdSliders from './MLThresholdSliders.vue'
 import AllowlistTable from './AllowlistTable.vue'
 import AliasTable from './AliasTable.vue'
 import BackupCard from './BackupCard.vue'
-import LegacyMigrationCard from './LegacyMigrationCard.vue'
 import { useSystemActivityStore } from '../../stores/systemActivity.js'
 
 // Poll queue depths so each card's QueueStatusBar shows live pending

frontend/src/stores/migration.js

@@ -1,83 +0,0 @@
-import { defineStore } from 'pinia'
-import { ref, computed } from 'vue'
-import { useApi } from '../composables/useApi.js'
-
-const POLL_MS = 2000
-
-export const useMigrationStore = defineStore('migration', () => {
-  const api = useApi()
-
-  const activeRun = ref(null)
-  const recentRuns = ref([])
-  const error = ref(null)
-  const loading = ref(false)
-
-  let pollHandle = null
-
-  async function trigger(kind, params, file = null) {
-    loading.value = true
-    error.value = null
-    try {
-      let body
-      if (file) {
-        // Multipart upload for ingest kinds.
-        const form = new FormData()
-        form.append('export_file', file)
-        if (params && params.dry_run) form.append('dry_run', 'true')
-        if (params && params.force) form.append('force', 'true')
-        body = await api.post(`/api/migrate/${kind}`, { body: form })
-      } else {
-        body = await api.post(`/api/migrate/${kind}`, { body: params || {} })
-      }
-      await loadRun(body.run_id)
-      pollActive(body.run_id)
-      return body
-    } catch (e) {
-      error.value = e
-      throw e
-    } finally {
-      loading.value = false
-    }
-  }
-
-  async function loadRun(runId) {
-    activeRun.value = await api.get(`/api/migrate/runs/${runId}`)
-  }
-
-  async function loadRecent() {
-    recentRuns.value = await api.get('/api/migrate/runs', { params: { limit: 10 } })
-  }
-
-  function pollActive(runId) {
-    stopPolling()
-    pollHandle = setInterval(async () => {
-      try {
-        const run = await api.get(`/api/migrate/runs/${runId}`)
-        activeRun.value = run
-        if (run.status === 'ok' || run.status === 'error') {
-          stopPolling()
-          await loadRecent()
-        }
-      } catch (e) {
-        error.value = e
-        stopPolling()
-      }
-    }, POLL_MS)
-  }
-
-  function stopPolling() {
-    if (pollHandle) {
-      clearInterval(pollHandle)
-      pollHandle = null
-    }
-  }
-
-  const isRunning = computed(
-    () => activeRun.value && activeRun.value.status === 'running',
-  )
-
-  return {
-    activeRun, recentRuns, error, loading, isRunning,
-    trigger, loadRun, loadRecent, pollActive, stopPolling,
-  }
-})