Remove dead task DB fast-path and update task tests

backend/tests/test_tasks/test_geo_cache_flush.py

@@ -31,7 +31,9 @@ def _make_app(flush_count: int = 0) -> MagicMock:
     """
     app = MagicMock()
     app.state.db = MagicMock()
+    app.state.db.close = AsyncMock()
     app.state.scheduler = MagicMock()
+    app.state.settings = MagicMock(database_path="/tmp/fake.db")
     return app
 
 
@@ -49,6 +51,10 @@ class TestRunFlush:
         app = _make_app()
 
         with patch(
+            "app.tasks.geo_cache_flush.open_db",
+            new_callable=AsyncMock,
+            return_value=app.state.db,
+        ), patch(
             "app.tasks.geo_cache_flush.geo_service.flush_dirty",
             new_callable=AsyncMock,
             return_value=0,
@@ -63,6 +69,10 @@ class TestRunFlush:
         app = _make_app()
 
         with patch(
+            "app.tasks.geo_cache_flush.open_db",
+            new_callable=AsyncMock,
+            return_value=app.state.db,
+        ), patch(
             "app.tasks.geo_cache_flush.geo_service.flush_dirty",
             new_callable=AsyncMock,
             return_value=15,
@@ -79,6 +89,10 @@ class TestRunFlush:
         app = _make_app()
 
         with patch(
+            "app.tasks.geo_cache_flush.open_db",
+            new_callable=AsyncMock,
+            return_value=app.state.db,
+        ), patch(
             "app.tasks.geo_cache_flush.geo_service.flush_dirty",
             new_callable=AsyncMock,
             return_value=0,