Merge remote-tracking branch 'origin/feat/332-image-categories-pr1' into feat/331-collections-pr1

Keep both features: a duplicate removal moves collection memberships and
copies the image category; both migrations and schema checks run; the
legacy route snapshot now records the six collection routes beside the
image category routes.

database/models.py

@@ -38,6 +38,7 @@ from .review_schema import (
     review_without_annotations_error,
 )
 from .saved_views import migrate_saved_views, saved_views_schema_error
+from .image_categories import image_categories_schema_error, migrate_image_categories
 from .workflow_documents import (
     DOCUMENT_ID_COLUMNS,
     migrate_workflow_documents,
@@ -355,6 +356,8 @@ class PromptModel:
         migrate_annotation_state(conn)
         migrate_review_state(conn)
         migrate_autotag_state(conn)
+        # Image categories (#332): independent of every table above.
+        migrate_image_categories(conn)
         # Last: the older generated_images rebuilds run only before file_path.
         migrate_workflow_documents(conn)
 
@@ -1160,8 +1163,9 @@ class PromptModel:
         Args:
             path: File to inspect
             require_library_state: Also require the tables every current
-                database has (Library state, image favorites, saved views,
-                collections, image annotations and the review queue), as a migrated
+                database has (Library state, image favorites, image
+                categories, saved views, collections, image annotations and
+                the review queue), as a migrated
                 restore stage must; old backups may lack them.
             documents: Read every workflow document and refuse a damaged
                 one. A restore checks its upload without it and repairs
@@ -1225,6 +1229,11 @@ class PromptModel:
             )
             if favorites_error:
                 return False, favorites_error
+            categories_error = image_categories_schema_error(
+                conn, allow_missing=not require_library_state
+            )
+            if categories_error:
+                return False, categories_error
             views_error = saved_views_schema_error(
                 conn, allow_missing=not require_library_state
             )