feat(db): add prefix snapshot tables (expand)

Таблицы prefix_snapshot и prefix_snapshot_row; колонка prefix_snapshot_id.

Co-authored-by: Cursor <cursoragent@cursor.com>

migrations/sqlite/000016_prefix_snapshot.down.sql

@@ -0,0 +1,3 @@
+ALTER TABLE config_revision DROP COLUMN prefix_snapshot_id;
+DROP TABLE IF EXISTS prefix_snapshot_row;
+DROP TABLE IF EXISTS prefix_snapshot;