diff --git a/src/blacki/storage/sqlite.py b/src/blacki/storage/sqlite.py
index 97e456f..5f1ef9a 100644
--- a/src/blacki/storage/sqlite.py
+++ b/src/blacki/storage/sqlite.py
@@ -33,14 +33,14 @@ async def create_connection(
     path = Path(db_path)
     path.parent.mkdir(parents=True, exist_ok=True)
 
-    conn = await aiosqlite.connect(path)
+    conn = await aiosqlite.connect(path, isolation_level=None)
     conn.row_factory = aiosqlite.Row
 
     await conn.execute("PRAGMA journal_mode=WAL")
     await conn.execute(f"PRAGMA busy_timeout={busy_timeout_ms}")
     await conn.execute("PRAGMA foreign_keys=ON")
 
-    logger.info("SQLite connection opened: %s (WAL mode)", path)
+    logger.info("SQLite connection opened: %s (WAL mode, autocommit)", path)
     return conn
 
 
diff --git a/src/blacki/workouts/storage.py b/src/blacki/workouts/storage.py
index 3dc2948..1c42712 100644
--- a/src/blacki/workouts/storage.py
+++ b/src/blacki/workouts/storage.py
@@ -152,10 +152,10 @@ async def create_session(self, session: WorkoutSession) -> int:
                             exercise.notes,
                         ),
                     )
-                await self._conn.commit()
+                await self._conn.execute("COMMIT")
                 return sid
             except Exception:
-                await self._conn.rollback()
+                await self._conn.execute("ROLLBACK")
                 raise
 
     async def add_exercise(self, session_id: int, exercise: WorkoutExercise) -> int:
diff --git a/tests/calories/test_storage.py b/tests/calories/test_storage.py
index 1a5820b..cd96f26 100644
--- a/tests/calories/test_storage.py
+++ b/tests/calories/test_storage.py
@@ -15,7 +15,7 @@
 @pytest.fixture
 async def conn():
     """Create an in-memory SQLite connection for testing."""
-    conn = await aiosqlite.connect(":memory:")
+    conn = await aiosqlite.connect(":memory:", isolation_level=None)
     conn.row_factory = aiosqlite.Row
     yield conn
     await conn.close()
diff --git a/tests/reminders/test_storage.py b/tests/reminders/test_storage.py
index 14936d3..6599ecf 100644
--- a/tests/reminders/test_storage.py
+++ b/tests/reminders/test_storage.py
@@ -16,7 +16,7 @@
 @pytest.fixture
 async def conn():
     """Create an in-memory SQLite connection for testing."""
-    conn = await aiosqlite.connect(":memory:")
+    conn = await aiosqlite.connect(":memory:", isolation_level=None)
     conn.row_factory = aiosqlite.Row
     yield conn
     await conn.close()
diff --git a/tests/storage/test_base.py b/tests/storage/test_base.py
index 5f39473..65e7982 100644
--- a/tests/storage/test_base.py
+++ b/tests/storage/test_base.py
@@ -22,7 +22,7 @@ async def _create_tables(self) -> None:
 @pytest.fixture
 async def conn():
     """Create an in-memory SQLite connection for testing."""
-    conn = await aiosqlite.connect(":memory:")
+    conn = await aiosqlite.connect(":memory:", isolation_level=None)
     conn.row_factory = aiosqlite.Row
     yield conn
     await conn.close()
diff --git a/tests/storage/test_sqlite.py b/tests/storage/test_sqlite.py
index 271f588..ab013b1 100644
--- a/tests/storage/test_sqlite.py
+++ b/tests/storage/test_sqlite.py
@@ -73,7 +73,7 @@ async def test_close_connection_with_memory_db(self) -> None:
         """Should close an in-memory connection."""
         import aiosqlite
 
-        conn = await aiosqlite.connect(":memory:")
+        conn = await aiosqlite.connect(":memory:", isolation_level=None)
 
         await close_connection(conn)
 
diff --git a/tests/test_container.py b/tests/test_container.py
index bc13fc2..25a4775 100644
--- a/tests/test_container.py
+++ b/tests/test_container.py
@@ -68,7 +68,7 @@ def teardown_method(self) -> None:
     @pytest.mark.asyncio
     async def test_creates_container_from_connection(self) -> None:
         """Should create and set container from existing connection."""
-        conn = await aiosqlite.connect(":memory:")
+        conn = await aiosqlite.connect(":memory:", isolation_level=None)
         try:
             container = set_container_from_connection(conn)
 
@@ -80,7 +80,7 @@ async def test_creates_container_from_connection(self) -> None:
     @pytest.mark.asyncio
     async def test_creates_container_with_custom_lock(self) -> None:
         """Should use provided lock."""
-        conn = await aiosqlite.connect(":memory:")
+        conn = await aiosqlite.connect(":memory:", isolation_level=None)
         try:
             custom_lock = asyncio.Lock()
             container = set_container_from_connection(conn, lock=custom_lock)
@@ -150,7 +150,7 @@ def teardown_method(self) -> None:
     @pytest.fixture
     async def conn(self):
         """Create an in-memory SQLite connection for testing."""
-        conn = await aiosqlite.connect(":memory:")
+        conn = await aiosqlite.connect(":memory:", isolation_level=None)
         yield conn
         await conn.close()
 
diff --git a/tests/test_preferences.py b/tests/test_preferences.py
index b601f34..f66f0a4 100644
--- a/tests/test_preferences.py
+++ b/tests/test_preferences.py
@@ -12,7 +12,7 @@
 @pytest.fixture
 async def conn():
     """Create an in-memory SQLite connection for testing."""
-    conn = await aiosqlite.connect(":memory:")
+    conn = await aiosqlite.connect(":memory:", isolation_level=None)
     conn.row_factory = aiosqlite.Row
     yield conn
     await conn.close()
diff --git a/tests/workouts/test_storage.py b/tests/workouts/test_storage.py
index b449ac9..58a97df 100644
--- a/tests/workouts/test_storage.py
+++ b/tests/workouts/test_storage.py
@@ -17,7 +17,7 @@
 @pytest.fixture
 async def conn():
     """Create an in-memory SQLite connection for testing."""
-    conn = await aiosqlite.connect(":memory:")
+    conn = await aiosqlite.connect(":memory:", isolation_level=None)
     conn.row_factory = aiosqlite.Row
     yield conn
     await conn.close()
@@ -586,8 +586,6 @@ async def test_create_session_raises_when_lastrowid_none(self, conn, lock) -> No
         mock_cursor = AsyncMock()
         mock_cursor.lastrowid = None
         mock_conn.execute.return_value = mock_cursor
-        mock_conn.commit = AsyncMock()
-        mock_conn.rollback = AsyncMock()
 
         storage = SqliteWorkoutStorage(mock_conn, lock)
         storage._schema_ready = True
@@ -605,7 +603,9 @@ async def test_create_session_raises_when_lastrowid_none(self, conn, lock) -> No
         ):
             await storage.create_session(session)
 
-        mock_conn.rollback.assert_called_once()
+        mock_conn.execute.assert_called()
+        call_args = [call[0][0] for call in mock_conn.execute.call_args_list]
+        assert "ROLLBACK" in call_args
 
     @pytest.mark.asyncio
     async def test_create_session_rollback_on_exception(self, conn, lock) -> None:
@@ -615,11 +615,15 @@ async def test_create_session_rollback_on_exception(self, conn, lock) -> None:
         import aiosqlite
 
         mock_conn = AsyncMock(spec=aiosqlite.Connection)
-        mock_cursor = AsyncMock()
-        mock_cursor.lastrowid = 1
-        mock_conn.execute.return_value = mock_cursor
-        mock_conn.commit = AsyncMock(side_effect=Exception("commit failed"))
-        mock_conn.rollback = AsyncMock()
+
+        async def execute_side_effect(query, *args):
+            if "COMMIT" in query:
+                raise Exception("commit failed")
+            mock_cursor = AsyncMock()
+            mock_cursor.lastrowid = 1
+            return mock_cursor
+
+        mock_conn.execute.side_effect = execute_side_effect
 
         storage = SqliteWorkoutStorage(mock_conn, lock)
         storage._schema_ready = True
@@ -635,4 +639,5 @@ async def test_create_session_rollback_on_exception(self, conn, lock) -> None:
         with pytest.raises(Exception, match="commit failed"):
             await storage.create_session(session)
 
-        mock_conn.rollback.assert_called_once()
+        call_args = [call[0][0] for call in mock_conn.execute.call_args_list]
+        assert "ROLLBACK" in call_args