chore: retire ml-backfill-daily beat + the spent purge-legacy action (operator-approved)

- ml-backfill-daily: the CPU tag_and_embed backfill raced the GPU agent's
  daily embed backfill for the same NULL-embedding images at ~100x the cost
  (B1 audit verdict, milestone #124). The backfill TASK stays — the manual
  /api/ml/backfill button remains the deliberate CPU fallback pending B3.
- purge-legacy: one-time IR-migration cleanup, dry-run verified 0 targets on
  the live library before removal (A2 audit, milestone #123). Fully retired
  per rule 22: tile, store action, route, service fn, tests.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CDgx8bQS5YrGRK76v8HUnM

backend/app/api/admin.py

@@ -1,13 +1,12 @@
 """FC-3k: /api/admin — destructive admin actions.
 
-Five action surfaces:
+Action surfaces:
   POST   /api/admin/artists/<slug>/cascade-delete  (Tier C)
   POST   /api/admin/images/bulk-delete             (Tier C)
   DELETE /api/admin/tags/<int:tag_id>              (Tier B)
   POST   /api/admin/tags/<int:dest_id>/merge       (Tier B)
   POST   /api/admin/tags/prune-unused              (Tier A)
   POST   /api/admin/posts/prune-bare               (Tier A)
-  POST   /api/admin/tags/purge-legacy              (Tier A)
   GET    /api/admin/tags/<int:tag_id>/usage-count  (helper)
 
 Tier-C ops take a dry_run body flag (returns projection inline,
@@ -277,19 +276,6 @@ async def posts_reconcile_duplicates():
     return await _run_dry_run_op(reconcile_duplicate_posts, source_id=source_id)
 
 
-@admin_bp.route("/tags/purge-legacy", methods=["POST"])
-async def tags_purge_legacy():
-    """Tier-A: delete legacy IR-migration tags — archive/post/artist
-    kinds (e.g. `BlenderKnight:Hannah_BJ_Loops`) PLUS general tags with
-    a legacy name prefix (`source:*`, from IR's source kind that fell
-    back to general). dry-run preview returns per-kind + per-prefix
-    counts + a sample so the UI shows exactly what'll go before the
-    operator confirms with dry_run=false."""
-    from ..services.cleanup_service import purge_legacy_tags
-
-    return await _run_dry_run_op(purge_legacy_tags)
-
-
 @admin_bp.route("/tags/reset-content", methods=["POST"])
 async def tags_reset_content():
     """Tier-A: delete ALL general + character tags (the Camie-suggestable

backend/app/celery_app.py

@@ -97,10 +97,6 @@ def make_celery() -> Celery:
                 "task": "backend.app.tasks.maintenance.cleanup_old_tasks",
                 "schedule": 86400.0,  # daily
             },
-            "ml-backfill-daily": {
-                "task": "backend.app.tasks.ml.backfill",
-                "schedule": 86400.0,
-            },
             "train-heads-nightly": {
                 "task": "backend.app.tasks.ml.scheduled_train_heads",
                 "schedule": 86400.0,  # passive cadence; manual retrain stays available

backend/app/services/cleanup_service.py

@@ -718,71 +718,6 @@ def reconcile_duplicate_posts(
     return {"groups": len(groups), "merged": losers_total, "sample": sample}
 
 
-# Legacy tags FC no longer uses, in two shapes:
-#   (1) kinds the tag input never produces — archive/post/artist.
-#       provenance (post grouping) + archive membership are their own
-#       systems now, and artists are first-class Artist/Source rows.
-#       meta/rating were already hard-deleted by alembic 0023.
-#   (2) name prefixes from IR kinds FC never adopted — `source:*`.
-#       ImageRepo had a `source` kind; FC's enum doesn't, so ir_ingest
-#       fell those back to `general` (kind=general, name="source:patreon"
-#       etc.). They can't be caught by kind, so we match the name prefix.
-PURGEABLE_TAG_KINDS = ("archive", "post", "artist")
-LEGACY_NAME_PREFIXES = ("source:",)
-
-
-def _legacy_tag_predicate():
-    name_clauses = [Tag.name.like(f"{p}%") for p in LEGACY_NAME_PREFIXES]
-    return or_(Tag.kind.in_(PURGEABLE_TAG_KINDS), *name_clauses)
-
-
-def purge_legacy_tags(session: Session, *, dry_run: bool = False) -> dict:
-    """Count (dry_run) or delete legacy IR-migration tags: archive/post/
-    artist-kind tags PLUS general tags whose name matches a legacy
-    prefix (source:*).
-
-    CASCADE on image_tag / tag_alias / tag_suggestion_rejection / series_page
-    clears the related rows on the parent DELETE.
-
-    Returns:
-      {"by_kind": {kind: count, ...},        # kind-matched rows
-       "by_prefix": {"source:*": count},     # name-prefix-matched rows
-       "count": total, "sample_names": [first 50],
-       and on live runs "deleted": total}
-    """
-    predicate = _legacy_tag_predicate()
-    rows = session.execute(
-        select(Tag.id, Tag.name, Tag.kind).where(predicate)
-    ).all()
-    by_kind: dict[str, int] = {}
-    by_prefix: dict[str, int] = {}
-    for _id, name, kind in rows:
-        # Classify by name-prefix first so a source:* row counts once,
-        # under the prefix bucket, regardless of its (general) kind.
-        matched_prefix = next(
-            (p for p in LEGACY_NAME_PREFIXES if name.startswith(p)), None,
-        )
-        if matched_prefix is not None:
-            label = f"{matched_prefix}*"
-            by_prefix[label] = by_prefix.get(label, 0) + 1
-        else:
-            key = kind.value if hasattr(kind, "value") else str(kind)
-            by_kind[key] = by_kind.get(key, 0) + 1
-    sample = [name for _id, name, _kind in rows[:50]]
-    total = len(rows)
-    result = {
-        "by_kind": by_kind, "by_prefix": by_prefix,
-        "count": total, "sample_names": sample,
-    }
-    if dry_run:
-        return result
-    if total:
-        session.execute(Tag.__table__.delete().where(predicate))
-        session.commit()
-    result["deleted"] = total
-    return result
-
-
 # The CONTENT vocabulary. "Reset content tagging" wipes these so the operator
 # can re-tag from scratch. fandom + series (and series_page ordering) are
 # deliberately NOT here — they're kept.

frontend/src/components/settings/TagMaintenanceCard.vue

@@ -42,53 +42,6 @@
     </div>
   </MaintenanceTile>
 
-  <MaintenanceTile
-    icon="mdi-tag-off"
-    title="Legacy migration tags"
-    blurb="Purge retired archive/post/artist + source:* tags."
-    destructive
-  >
-    <p class="fc-muted text-body-2 mb-3">
-      Purge legacy IR-migration tags FC no longer uses: retired/system
-      kinds (<code>archive</code>, <code>post</code>, <code>artist</code> — e.g.
-      <code>BlenderKnight:Hannah_BJ_Loops</code>) plus <code>source:*</code> tags
-      (ImageRepo's old <code>source</code> kind, migrated to <code>general</code>).
-      Provenance and artists are their own systems now, so these are pure noise.
-      Removes them from every image.
-    </p>
-
-    <v-btn
-      color="accent" variant="flat" rounded="pill"
-      prepend-icon="mdi-magnify"
-      :loading="loadingKindPreview"
-      class="mb-3"
-      @click="onKindPreview"
-    >Preview legacy tags</v-btn>
-
-    <div v-if="kindPreview">
-      <p class="text-body-2 mb-2">
-        <strong>{{ kindPreview.count }}</strong> legacy tag(s).
-        <span v-for="(n, k) in kindPreview.by_kind" :key="k" class="fc-muted">
-          {{ k }}: {{ n }}&nbsp;&nbsp;
-        </span>
-        <span v-for="(n, p) in kindPreview.by_prefix" :key="p" class="fc-muted">
-          {{ p }}: {{ n }}&nbsp;&nbsp;
-        </span>
-      </p>
-      <SampleNameGrid
-        v-if="kindPreview.sample_names?.length"
-        :names="kindPreview.sample_names" class="mb-3"
-      />
-      <v-btn
-        color="error" variant="flat" rounded="pill"
-        prepend-icon="mdi-delete-sweep"
-        :disabled="!kindPreview.count"
-        :loading="kindCommitting"
-        @click="onKindCommit"
-      >Delete {{ kindPreview.count }} legacy tag(s)</v-btn>
-    </div>
-  </MaintenanceTile>
-
   <MaintenanceTile
     icon="mdi-tag-multiple"
     title="Reset content tagging"
@@ -216,16 +169,6 @@ const {
   emptyPreview: (r) => ({ count: 0, sample_names: r.sample_names || [] }),
 })
 
-// Legacy migration-tag purge.
-const {
-  previewData: kindPreview, previewing: loadingKindPreview,
-  committing: kindCommitting, runPreview: onKindPreview, runCommit: onKindCommit,
-} = usePreviewCommit({
-  preview: () => store.purgeLegacyTags({ dryRun: true }),
-  commit: () => store.purgeLegacyTags({ dryRun: false }),
-  emptyPreview: { count: 0, by_kind: {}, by_prefix: {}, sample_names: [] },
-})
-
 // Reset content tagging (general + character).
 const {
   previewData: resetPreview, previewing: loadingResetPreview,

frontend/src/stores/admin.js

@@ -101,10 +101,6 @@ export const useAdminStore = defineStore('admin', () => {
     })
   }
 
-  function purgeLegacyTags(opts = {}) {
-    return _dryRunPost('/api/admin/tags/purge-legacy', opts)
-  }
-
   // Destructive: deletes ALL general + character tags so the operator can
   // re-tag from scratch via auto-suggest. fandom + series preserved.
   function resetContentTagging(opts = {}) {
@@ -154,7 +150,6 @@ export const useAdminStore = defineStore('admin', () => {
     pruneUnusedTags,
     pruneBarePosts,
     reconcileDuplicatePosts,
-    purgeLegacyTags,
     resetContentTagging,
     normalizeTags,
     pollTaskUntilDone,

tests/test_api_admin.py

@@ -390,63 +390,6 @@ async def test_prune_unused_commit_deletes_and_returns_count(client, db):
     assert "byebye" in body["sample_names"]
 
 
-@pytest.mark.asyncio
-async def test_purge_legacy_dry_run_counts_by_kind_and_prefix(client, db):
-    db.add_all([
-        Tag(name="BlenderKnight:Hannah_BJ_Loops", kind=TagKind.archive),
-        Tag(name="BlenderKnight:May Animation", kind=TagKind.post),
-        Tag(name="SomeArtist", kind=TagKind.artist),
-        # IR `source` kind fell back to general during migration —
-        # caught by the source:* name prefix, not by kind.
-        Tag(name="source:patreon", kind=TagKind.general),
-        Tag(name="blonde hair", kind=TagKind.general),  # must survive
-    ])
-    await db.commit()
-
-    resp = await client.post(
-        "/api/admin/tags/purge-legacy", json={"dry_run": True},
-    )
-    body = await resp.get_json()
-    assert body["count"] == 4
-    assert body["by_kind"] == {"archive": 1, "post": 1, "artist": 1}
-    assert body["by_prefix"] == {"source:*": 1}
-    assert "blonde hair" not in body["sample_names"]
-    assert "source:patreon" in body["sample_names"]
-
-
-@pytest.mark.asyncio
-async def test_purge_legacy_commit_deletes_only_legacy(client, db):
-    from sqlalchemy import func, select
-
-    db.add_all([
-        Tag(name="arch1", kind=TagKind.archive),
-        Tag(name="source:fanbox", kind=TagKind.general),
-        Tag(name="keepme", kind=TagKind.general),
-        Tag(name="char1", kind=TagKind.character),
-    ])
-    await db.commit()
-
-    resp = await client.post(
-        "/api/admin/tags/purge-legacy", json={"dry_run": False},
-    )
-    body = await resp.get_json()
-    assert body["deleted"] == 2  # arch1 + source:fanbox
-
-    # The plain general + character tags survive.
-    keep = (await db.execute(
-        select(Tag.name).where(Tag.name.in_(["keepme", "char1"]))
-    )).scalars().all()
-    assert set(keep) == {"keepme", "char1"}
-    # No archive/post/artist or source:* left.
-    gone = (await db.execute(
-        select(func.count()).select_from(Tag).where(
-            (Tag.kind.in_([TagKind.archive, TagKind.post, TagKind.artist]))
-            | (Tag.name.like("source:%"))
-        )
-    )).scalar_one()
-    assert gone == 0
-
-
 # --- Tier-A: POST /posts/prune-bare + /posts/reconcile-duplicates ---
 # These two routes share _run_dry_run_op with the tag prunes (DRY pass,
 # task #753); cover their apply path + reconcile's source_id passthrough so