Migrated links, lyrics and properties

folkugat_web/dal/sql/_connection.py

@@ -1,6 +1,6 @@
 import sqlite3
+from collections.abc import Iterator
 from contextlib import contextmanager
-from typing import Iterator, Optional
 
 from folkugat_web.config.db import DB_FILE
 
@@ -13,6 +13,7 @@ def get_connection(con: Connection | None = None) -> Iterator[Connection]:
         yield con
     else:
         con = sqlite3.connect(DB_FILE)
+        _ = con.execute('PRAGMA foreign_keys = ON;')
         try:
             yield con
             con.commit()