log refactor

backend/src/app.py

@@ -29,6 +29,9 @@ from .dependencies import get_task_manager, get_scheduler_service
 from .core.encryption_key import ensure_encryption_key
 from .core.utils.network import NetworkError
 from .core.logger import logger, belief_scope
+from .core.cot_logger import MarkerLogger
+
+startup_log = MarkerLogger("Startup")
 from .core.database import AuthSessionLocal
 from .core.auth.security import get_password_hash
 from .models.auth import User, Role
@@ -136,10 +139,11 @@ def ensure_initial_admin_user() -> None:
 # Startup event
 @app.on_event("startup")
 async def startup_event():
-    with belief_scope("startup_event"):
-        ensure_encryption_key()
-        ensure_initial_admin_user()
-        scheduler = get_scheduler_service()
+    startup_log.reason("Enter startup event")
+    ensure_encryption_key()
+    ensure_initial_admin_user()
+    scheduler = get_scheduler_service()
+    startup_log.reflect("Application startup completed")
     scheduler.start()
 
 
@@ -163,7 +167,7 @@ async def shutdown_event():
 # [/DEF:shutdown_event:Function]
 
 # [DEF:app_middleware:Block]
-# @PURPOSE: Configure application-wide middleware (Session, CORS).
+# @PURPOSE: Configure application-wide middleware (Session, CORS, TraceContext).
 # Configure Session Middleware (required by Authlib for OAuth2 flow)
 from .core.auth.config import auth_config
 
@@ -177,6 +181,11 @@ app.add_middleware(
     allow_methods=["*"],
     allow_headers=["*"],
 )
+
+# Configure Trace Context Middleware (seeds trace_id per request)
+from .core.middleware.trace import TraceContextMiddleware
+
+app.add_middleware(TraceContextMiddleware)
 # [/DEF:app_middleware:Block]
 
 
@@ -187,10 +196,13 @@ app.add_middleware(
 # @POST: Returns 503 HTTP Exception.
 # @PARAM: request (Request) - The incoming request object.
 # @PARAM: exc (NetworkError) - The exception instance.
+eh_log = MarkerLogger("ExceptionHandler")
+
+
 @app.exception_handler(NetworkError)
 async def network_error_handler(request: Request, exc: NetworkError):
     with belief_scope("network_error_handler"):
-        logger.error(f"Network error: {exc}")
+        eh_log.explore("Unhandled NetworkError in request", error=str(exc), payload={"url": str(request.url)})
         return HTTPException(
             status_code=503,
             detail="Environment unavailable. Please check if the Superset instance is running.",