fix(storage): address repository review feedback

backend/tests/test_storage_persistence_config.py

@@ -1,6 +1,8 @@
 from __future__ import annotations
 
 import os
+import subprocess
+import sys
 from pathlib import Path
 from types import SimpleNamespace
 
@@ -62,6 +64,30 @@ def test_database_postgres_config_preserves_url_and_pool_options():
     assert url.database == "deerflow"
 
 
+def test_mysql_database_url_is_normalized_to_async_driver():
+    storage = StorageConfig(
+        driver="mysql",
+        database_url="mysql://user:pass@db.example:3306/deerflow",
+    )
+
+    url = _create_database_url(storage)
+
+    assert url.drivername == "mysql+aiomysql"
+    assert url.database == "deerflow"
+
+
+def test_mysql_async_database_url_is_preserved():
+    storage = StorageConfig(
+        driver="mysql",
+        database_url="mysql+asyncmy://user:pass@db.example:3306/deerflow",
+    )
+
+    url = _create_database_url(storage)
+
+    assert url.drivername == "mysql+asyncmy"
+    assert url.database == "deerflow"
+
+
 def test_database_postgres_requires_url():
     database = SimpleNamespace(backend="postgres", postgres_url="")
 
@@ -74,3 +100,25 @@ def test_unsupported_database_backend_rejected():
 
     with pytest.raises(ValueError, match="Unsupported database backend"):
         storage_config_from_database_config(database)
+
+
+def test_storage_models_import_without_config_file(tmp_path):
+    env = os.environ.copy()
+    env["DEER_FLOW_CONFIG_PATH"] = str(tmp_path / "missing-config.yaml")
+
+    result = subprocess.run(
+        [
+            sys.executable,
+            "-c",
+            "from store.persistence.base_model import UniversalText, id_key; "
+            "from store.repositories.models import RunEvent; "
+            "print(UniversalText.__name__, RunEvent.__tablename__, id_key)",
+        ],
+        check=False,
+        capture_output=True,
+        env=env,
+        text=True,
+    )
+
+    assert result.returncode == 0, result.stderr
+    assert "UniversalText run_events" in result.stdout