feat：工作流支持事件触发

database/versions/4666ce24a443_2_1_8.py

@@ -0,0 +1,37 @@
+"""2.1.8
+
+Revision ID: 4666ce24a443
+Revises: 3891a5e722a1
+Create Date: 2025-07-22 13:54:04.196126
+
+"""
+import contextlib
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = '4666ce24a443'
+down_revision = '3891a5e722a1'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    with contextlib.suppress(Exception):
+        # 添加触发类型字段
+        op.add_column('workflow', sa.Column('trigger_type', sa.String(), nullable=True, default='timer'))
+
+    with contextlib.suppress(Exception):
+        # 添加事件类型字段
+        op.add_column('workflow', sa.Column('event_type', sa.String(), nullable=True))
+
+    with contextlib.suppress(Exception):
+        # 添加事件条件字段
+        op.add_column('workflow', sa.Column('event_conditions', sa.JSON(), nullable=True, default={}))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    pass