细节优化

backend/alembic/versions/5bb03575e2e7_add_kb_token_expires_at.py

@@ -0,0 +1,29 @@
+"""add_kb_token_expires_at
+
+Revision ID: 5bb03575e2e7
+Revises: 4e40432cab9f
+Create Date: 2026-09-02 17:49:46.298836
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '5bb03575e2e7'
+down_revision: Union[str, None] = '4e40432cab9f'
+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('knowledge_bases', sa.Column('token_expires_at', sa.String(length=32), nullable=True, comment='链接过期时间，NULL=长期有效'))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('knowledge_bases', 'token_expires_at')
+    # ### end Alembic commands ###