perf: refactor SIP-68 db migrations with INSERT SELECT FROM (#19421)

tests/unit_tests/utils/db.py

@@ -0,0 +1,30 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+from typing import Any
+
+from superset import security_manager
+
+
+def get_test_user(id_: int, username: str) -> Any:
+    """Create a sample test user"""
+    return security_manager.user_model(
+        id=id_,
+        username=username,
+        first_name=username,
+        last_name=username,
+        email=f"{username}@example.com",
+    )