Fix startup runtime settings ordering and use effective database path for request DB connections

backend/tests/test_dependencies.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from pathlib import Path
-from unittest.mock import MagicMock
+from unittest.mock import AsyncMock, MagicMock, patch
 
 import aiohttp
 import pytest
@@ -12,6 +12,7 @@ from app.config import Settings
 from app.dependencies import (
     ApplicationContext,
     get_app_context,
+    get_db,
     get_http_session,
     get_scheduler,
     get_settings,
@@ -64,6 +65,25 @@ async def test_app_context_dependency_exposes_shared_resources(test_settings: Se
     await session.close()
 
 
+@pytest.mark.asyncio
+async def test_get_db_uses_effective_runtime_database_path(test_settings: Settings) -> None:
+    """Database connections should use effective runtime settings when overridden."""
+    runtime_settings = test_settings.model_copy(update={"database_path": "/tmp/runtime.db"})
+
+    mock_connection = MagicMock()
+    mock_connection.close = AsyncMock()
+
+    with patch("app.db.open_db", new=AsyncMock(return_value=mock_connection)) as mock_open_db:
+        gen = get_db(settings=runtime_settings)
+        try:
+            connection = await gen.__anext__()
+            assert connection is mock_connection
+        finally:
+            await gen.aclose()
+
+    mock_open_db.assert_awaited_once_with("/tmp/runtime.db")
+
+
 def test_request_app_state_access_is_only_allowed_in_dependencies() -> None:
     app_root = Path(__file__).resolve().parents[1] / "app"
     bad_modules: list[str] = []