fix: enable foreign key enforcement in fuzz DB

internal/fuzz/db.go

@@ -27,5 +27,9 @@ func GetFuzzDB() (*gorm.DB, error) {
 		return nil, err
 	}
 
+	if execErr := db.Exec("PRAGMA foreign_keys = ON").Error; execErr != nil {
+		return nil, execErr
+	}
+
 	return db, nil
 }