fix(persistence): separate retryable rejection errors (#6423)

app/factory.py

@@ -15,8 +15,7 @@ from app.adapters.web.plugin.routes import FastAPIDynamicRouteRegistry
 from app.adapters.web.health import install_health_routes
 from app.application.plugin.routes import configure_plugin_routes
 from app.schemas.exception import (
-    DatabaseWorkerClosedError,
-    DatabaseWorkerOverloadedError,
+    PersistenceUnavailableError,
 )
 from app.adapters.web.security.access import (
     configure_token_codec,
@@ -235,11 +234,11 @@ async def localized_http_exception_handler(
     )
 
 
-async def database_worker_overloaded_handler(
+async def persistence_unavailable_handler(
         request: Request,
-        _exc: DatabaseWorkerClosedError | DatabaseWorkerOverloadedError,
+        _exc: PersistenceUnavailableError,
 ) -> JSONResponse:
-    """将数据库 worker 暂不可用映射为可重试的 503 响应。"""
+    """将持久化能力暂不可用映射为可重试的 503 响应。"""
     return await localized_http_exception_handler(
         request,
         HTTPException(
@@ -335,12 +334,8 @@ def create_app() -> FastAPI:
 
     _app.add_exception_handler(HTTPException, localized_http_exception_handler)
     _app.add_exception_handler(
-        DatabaseWorkerOverloadedError,
-        database_worker_overloaded_handler,
-    )
-    _app.add_exception_handler(
-        DatabaseWorkerClosedError,
-        database_worker_overloaded_handler,
+        PersistenceUnavailableError,
+        persistence_unavailable_handler,
     )
     _app.add_exception_handler(
         RequestValidationError,