fix(alembic): P1-2 生成消息状态字段迁移

backend/alembic/versions/009_add_message_status.py

@@ -0,0 +1,36 @@
+"""add message status and recallable_until
+
+Revision ID: 009_add_message_status
+Revises:
+Create Date: 2026-06-14
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '009_add_message_status'
+down_revision: Union[str, None] = '008_add_agent_password'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Add status field
+    op.add_column(
+        'messages',
+        sa.Column('status', sa.String(20), nullable=False, server_default='sent')
+    )
+    # Add recallable_until field
+    op.add_column(
+        'messages',
+        sa.Column('recallable_until', sa.DateTime(timezone=True), nullable=True)
+    )
+
+
+def downgrade() -> None:
+    op.drop_column('messages', 'recallable_until')
+    op.drop_column('messages', 'status')