```

refactor: 移除审批和回写功能模块

移除了整个审批(approvals)和官方回写(writebacks)功能模块，
包括相关模型、路由、服务和配置项。更新了数据库迁移文件，
删除了相关的审批请求表和官方回写运行表。同时从API路由器中
移除了相应的路由，并调整了安全常量和字段验证器以匹配变更。
```

app/modules/events/constants.py

@@ -8,30 +8,23 @@ class EventStatus(StrEnum):
 
 
 class EventType(StrEnum):
-    APPROVAL_DECIDED = "approval.decided"
     RISK_ACTION_RECORDED = "risk.action_recorded"
     REPORT_PUSH_SUCCEEDED = "report.push_succeeded"
     REPORT_PUSH_FAILED = "report.push_failed"
     LEGACY_SYNC_COMPLETED = "legacy.sync_completed"
-    WRITEBACK_REQUESTED = "writeback.requested"
-    WRITEBACK_SUBMITTED = "writeback.submitted"
 
 
 class EventSource(StrEnum):
-    APPROVAL = "approval"
     RISK = "risk"
     REPORTS = "reports"
     LEGACY_MYSQL = "legacy_mysql"
-    WRITEBACK = "writeback"
     API = "api"
 
 
 class EventAggregateType(StrEnum):
-    APPROVAL = "approval"
     RISK_EVENT = "risk-event"
     REPORT_PUSH_RUN = "report-push-run"
     LEGACY_SYNC_RUN = "legacy-sync-run"
-    WRITEBACK_RUN = "writeback-run"
 
 
 class EventResponseKey(StrEnum):
@@ -43,10 +36,8 @@ class EventResponseKey(StrEnum):
 class EventPayloadKey(StrEnum):
     ACTION = "action"
     STATUS = "status"
-    TICKET_ID = "ticket_id"
     DOMAIN = "domain"
     RECORD_ID = "record_id"
-    APPROVED = "approved"
     COMMENT = "comment"
     CODE = "code"
     CREATED = "created"

app/modules/events/routes.py

@@ -2,6 +2,7 @@ from fastapi import APIRouter, Depends, Query
 from sqlalchemy.orm import Session
 
 from app.core.database import get_db
+from app.core.operation_guard import require_operations_enabled
 from app.core.security import require_api_key
 from app.modules.events.constants import EventResponseKey
 from app.modules.events.service import EventService, _serialize_event
@@ -30,6 +31,7 @@ def dispatch_event(
     event_id: str,
     db: Session = Depends(get_db),
 ) -> dict:
+    require_operations_enabled()
     return {EventResponseKey.EVENT: _serialize_event(EventService(db).dispatch_event(event_id))}
 
 
@@ -38,4 +40,5 @@ def dispatch_pending(
     limit: int = Query(default=100, ge=1, le=500),
     db: Session = Depends(get_db),
 ) -> dict:
+    require_operations_enabled()
     return {EventResponseKey.ITEMS: EventService(db).dispatch_pending(limit=limit)}

app/modules/events/service.py

@@ -131,9 +131,6 @@ class EventService:
     def _handle_event(self, record: DomainEvent) -> None:
         if record.event_type == EventType.RISK_ACTION_RECORDED:
             self._handle_risk_action(record)
-            return
-        if record.event_type in {EventType.WRITEBACK_REQUESTED, EventType.WRITEBACK_SUBMITTED}:
-            self._handle_writeback(record)
 
     def _handle_risk_action(self, record: DomainEvent) -> None:
         from app.modules.risk.constants import RiskEventActionValue
@@ -157,28 +154,3 @@ class EventService:
             actor=record.actor,
             payload=payload,
         )
-
-    def _handle_writeback(self, record: DomainEvent) -> None:
-        from app.modules.workflows.service import WorkflowService
-        from app.modules.workflows.constants import WorkflowStatus, WorkflowType
-        from app.modules.writebacks.constants import WritebackStatus
-
-        payload = record.payload or {}
-        run_status = str(payload.get(EventPayloadKey.STATUS) or "")
-        if run_status == WritebackStatus.SENT:
-            workflow_status = WorkflowStatus.COMPLETED
-        elif run_status == WritebackStatus.FAILED:
-            workflow_status = WorkflowStatus.FAILED
-        elif run_status == WritebackStatus.DISABLED:
-            workflow_status = WorkflowStatus.BLOCKED
-        else:
-            workflow_status = WorkflowStatus.WAITING_APPROVAL
-        WorkflowService(self.db).start_or_update(
-            workflow_type=WorkflowType.OFFICIAL_WRITEBACK,
-            aggregate_type=EventAggregateType.WRITEBACK_RUN,
-            aggregate_id=record.aggregate_id,
-            status_value=workflow_status,
-            action=record.event_type,
-            actor=record.actor,
-            payload=payload,
-        )