refactor

backend/app/db/migrate.py

@@ -1,6 +1,7 @@
 from sqlalchemy import inspect, text
 
 from app.db.base import engine
+from app.db.dialect import bool_literal
 
 
 def run_migrations() -> None:
@@ -17,7 +18,7 @@ def run_migrations() -> None:
                 conn.execute(
                     text(
                         "ALTER TABLE pomodoro_sessions "
-                        "ADD COLUMN completion_notified BOOLEAN DEFAULT 0"
+                        f"ADD COLUMN completion_notified BOOLEAN DEFAULT {bool_literal(engine, False)}"
                     )
                 )