[add]migration script

api/migrations/versions/5ca246ee7dd4_202601291352.py

@@ -0,0 +1,30 @@
+"""202601291352
+
+Revision ID: 5ca246ee7dd4
+Revises: 915bed077f8d
+Create Date: 2026-01-29 13:52:47.647306
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = '5ca246ee7dd4'
+down_revision: Union[str, None] = '915bed077f8d'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('model_bases', sa.Column('created_at', sa.DateTime(), server_default=sa.text('now()'), nullable=True, comment='创建时间'))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('model_bases', 'created_at')
+    # ### end Alembic commands ###