refactor(ml): drop dead tagger/suggestion settings + columns (#1199)

Hygiene follow-up to the Camie retirement (#1189) — these were left inert to
bound that change; nothing reads them now. Migration 0068 drops:
- ml_settings: tagger_store_floor, tagger_model_version, suggestion_threshold_
  character/general (already dead pre-retirement — scoring uses per-head
  thresholds), video_min_tag_frames (only the deleted video-prediction
  aggregator used it).
- image_record: tagger_model_version (no writer), centroid_scores (dead JSON
  cache, no reader).

Also: ml_admin _EDITABLE/GET/_validate pruned (dropped the store-floor invariant
+ video_min_tag_frames check); MLThresholdSliders trimmed to a video-embedding
card (interval + max frames only); importer no longer resets the dropped cols;
download_models drops the Camie fetch; stale CASCADE comments in cleanup_service
no longer name the removed tables. Tests updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ttrj5P7upUTueSfoJcxEqa

tests/test_download_models.py

@@ -1,6 +1,6 @@
 """download_models tests. No network in CI; we test the 'already present →
-skip' short-circuit by faking the expected files, and that main() wires
-both ensure_* calls.
+skip' short-circuit by faking the expected files, and that main() wires the
+SigLIP fetch. (Camie download retired with the tagger, #1199.)
 """
 
 from unittest.mock import patch
@@ -8,29 +8,6 @@ from unittest.mock import patch
 from backend.app.scripts import download_models as dm
 
 
-def test_ensure_camie_skips_when_present(tmp_path, monkeypatch):
-    """v2 layout (HF Camais03/camie-tagger-v2): the ONNX file is named
-    camie-tagger-v2.onnx (not model.onnx) and tags ship inside
-    camie-tagger-v2-metadata.json (not selected_tags.csv). Both at root.
-    Updated 2026-05-25 after the actual repo layout was confirmed via
-    WebFetch — the old assertion pinned the v1 filenames."""
-    monkeypatch.setattr(dm, "MODEL_ROOT", tmp_path)
-    camie = tmp_path / "camie"
-    camie.mkdir(parents=True)
-    (camie / "camie-tagger-v2.onnx").write_bytes(b"x")
-    (camie / "camie-tagger-v2-metadata.json").write_text("{}")
-    with patch.object(dm, "_snapshot") as snap:
-        dm.ensure_camie()
-        snap.assert_not_called()
-
-
-def test_ensure_camie_downloads_when_missing(tmp_path, monkeypatch):
-    monkeypatch.setattr(dm, "MODEL_ROOT", tmp_path)
-    with patch.object(dm, "_snapshot") as snap:
-        dm.ensure_camie()
-        snap.assert_called_once()
-
-
 def test_ensure_siglip_skips_when_present(tmp_path, monkeypatch):
     monkeypatch.setattr(dm, "MODEL_ROOT", tmp_path)
     sig = tmp_path / "siglip"
@@ -42,9 +19,15 @@ def test_ensure_siglip_skips_when_present(tmp_path, monkeypatch):
         snap.assert_not_called()
 
 
-def test_main_calls_both(monkeypatch):
+def test_ensure_siglip_downloads_when_missing(tmp_path, monkeypatch):
+    monkeypatch.setattr(dm, "MODEL_ROOT", tmp_path)
+    with patch.object(dm, "_snapshot") as snap:
+        dm.ensure_siglip()
+        snap.assert_called_once()
+
+
+def test_main_fetches_siglip(monkeypatch):
     calls = []
-    monkeypatch.setattr(dm, "ensure_camie", lambda: calls.append("camie"))
     monkeypatch.setattr(dm, "ensure_siglip", lambda: calls.append("siglip"))
     assert dm.main() == 0
-    assert calls == ["camie", "siglip"]
+    assert calls == ["siglip"]