fix: gallery tag filters and tag-cleanup are empty in single-user mode (#1771)

tests/test_gallery_owner_filter_single_user.py

@@ -0,0 +1,56 @@
+"""_owner_filter must not blank out the gallery in single-user mode.
+
+When AUTH_ENABLED=false, get_current_user returns None. The gallery main
+list and stats treat None as "show all images" (`if user is not None`), but
+_owner_filter returned q.filter(False) (zero rows) for None. So the tag and
+model filter chips were always empty and clear-user-tags / clear-ai-tags /
+dedupe-tags silently no-oped. _owner_filter must match the main list: no
+filter when user is None, owner-scoped otherwise.
+"""
+import tempfile
+import uuid
+
+import pytest
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.pool import NullPool
+
+import core.database as cdb
+from core.database import GalleryImage
+from routes.gallery_helpers import _owner_filter
+
+_TMPDB = tempfile.NamedTemporaryFile(suffix=".db", delete=False)
+_ENGINE = create_engine(f"sqlite:///{_TMPDB.name}", connect_args={"check_same_thread": False}, poolclass=NullPool)
+cdb.Base.metadata.create_all(_ENGINE)
+_TS = sessionmaker(bind=_ENGINE, autoflush=False, autocommit=False)
+
+
+def _seed(*owners):
+    db = _TS()
+    try:
+        db.query(GalleryImage).delete()
+        for o in owners:
+            db.add(GalleryImage(id=str(uuid.uuid4()), filename=f"{uuid.uuid4().hex}.png", owner=o))
+        db.commit()
+    finally:
+        db.close()
+
+
+def test_none_user_returns_all_rows():
+    _seed(None, None, "alice")
+    db = _TS()
+    try:
+        n = _owner_filter(db.query(GalleryImage), None).count()
+        assert n == 3  # old code returned 0
+    finally:
+        db.close()
+
+
+def test_named_user_is_still_scoped():
+    _seed("alice", "alice", "bob", None)
+    db = _TS()
+    try:
+        assert _owner_filter(db.query(GalleryImage), "alice").count() == 2
+        assert _owner_filter(db.query(GalleryImage), "bob").count() == 1
+    finally:
+        db.close()