fix: sqlite migration drops allowed user groups

backend/resources/migrations/sqlite/20250630000000_kv_table.up.sql

@@ -1,6 +1,11 @@
+PRAGMA foreign_keys=OFF;
+BEGIN;
 -- The "kv" tables contains miscellaneous key-value pairs
 CREATE TABLE kv
 (
     "key"  TEXT NOT NULL PRIMARY KEY,
     "value" TEXT NOT NULL
 );
+
+COMMIT;
+PRAGMA foreign_keys=ON;