feat(images): remove a file's records and hide it with a removal mark (#480)

Deletes every record of one file under every recorded spelling (image links,
tags, auto-tag marks, pending review items, category, collection memberships,
favorite) in one transaction. A Needs review item that is kept keeps its
annotation rows (ON DELETE RESTRICT). The image_removals table hides an exact
file (locator, size, mtime_ns) until it changes; linking skips a marked file,
and an explicit tag, category, favorite or collection write shows it again.

database/annotations.py

@@ -40,6 +40,7 @@ from .annotation_schema import (
     METADATA_TABLE,
 )
 from .autotag_schema import AUTOTAG_TABLE
+from .image_removal_schema import clear_marks
 from .library_commands import _UUID, LibraryCommandError, _validate_epoch
 from .models import utc_now_iso
 from .vocabulary import validate_vocabulary_tag_name
@@ -236,6 +237,9 @@ class AnnotationOperations:
 
     @staticmethod
     def _annotation_owner(conn: sqlite3.Connection, locator: str, now: str) -> str:
+        # A file with image tags or Needs review state is in the library: a
+        # removal mark never hides it (#480).
+        clear_marks(conn, [locator])
         row = conn.execute(_OWNER, (locator,)).fetchone()
         if row is not None:
             return row[0]