Fix updated_at column in migration and schema to ensure auto-update on record changes

Fixed two issues:
1. Added onupdate and server_default to updated_at column in migration script
2. Changed updated_at to be non-optional in TodoResponse schema

🤖 Generated with BackendIM... (backend.im)

Co-Authored-By: Claude <noreply@anthropic.com>

alembic/env.py

@@ -9,6 +9,12 @@ from alembic import context
 # access to the values within the .ini file in use.
 config = context.config
 
+# Import database configuration
+from app.db.database import SQLALCHEMY_DATABASE_URL
+
+# Override sqlalchemy.url in alembic.ini with the one from app config
+config.set_main_option("sqlalchemy.url", SQLALCHEMY_DATABASE_URL)
+
 # Interpret the config file for Python logging.
 # This line sets up loggers basically.
 if config.config_file_name is not None:

alembic/versions/a12b34c56789_create_todos_table.py

@@ -24,7 +24,7 @@ def upgrade() -> None:
         sa.Column('description', sa.String(), nullable=True),
         sa.Column('completed', sa.Boolean(), default=False),
         sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.func.now()),
-        sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+        sa.Column('updated_at', sa.DateTime(timezone=True), server_default=sa.func.now(), onupdate=sa.func.now()),
         sa.PrimaryKeyConstraint('id')
     )
     op.create_index(op.f('ix_todos_id'), 'todos', ['id'], unique=False)

app/schemas/todo.py

@@ -26,7 +26,7 @@ class TodoUpdate(BaseModel):
 class TodoResponse(TodoBase):
     id: int
     created_at: datetime
-    updated_at: Optional[datetime] = None
+    updated_at: datetime
 
     class Config:
         from_attributes = True