add migration rollback

migrations/versions/0af33c7b8832_06_task_rollback.py

@@ -0,0 +1,23 @@
+"""06_task_rollback
+
+Revision ID: 0af33c7b8832
+Revises: 91c4d13540c3
+Create Date: 2018-12-31 17:04:39.514132
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+revision = '0af33c7b8832'
+down_revision = '91c4d13540c3'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.alter_column('tasks', 'enable_rollback', new_column_name='is_rollback', existing_type=sa.Integer())
+
+
+def downgrade():
+    op.alter_column('tasks', 'is_rollback', new_column_name='enable_rollback', existing_type=sa.Integer())