优化

migrations/versions/a3f8c2d91e47_add_batch_id_to_processing_tasks.py

@@ -0,0 +1,38 @@
+"""add batch_id to processing_tasks
+
+批次 2（D7）：批量元数据入库——processing_tasks 增加 batch_id 列，
+批量任务聚合查询走 PG，替代 Redis/进程内存中的批量元数据。
+
+Revision ID: a3f8c2d91e47
+Revises: 006c18c51b0d
+Create Date: 2026-09-16
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'a3f8c2d91e47'
+down_revision: Union[str, Sequence[str], None] = '006c18c51b0d'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        'processing_tasks',
+        sa.Column('batch_id', sa.String(length=36), nullable=True),
+    )
+    op.create_index(
+        'ix_processing_tasks_batch_id',
+        'processing_tasks',
+        ['batch_id'],
+    )
+
+
+def downgrade() -> None:
+    op.drop_index('ix_processing_tasks_batch_id', table_name='processing_tasks')
+    op.drop_column('processing_tasks', 'batch_id')