diagnose: add debug-worker endpoint to track background worker thread status

app/main.py

@@ -56,6 +56,8 @@ app.include_router(settings_router.router, prefix="/api")
 app.include_router(legal.router, prefix="/api")
 app.include_router(projects.router, prefix="/api")
 
+worker_status = {"status": "not_started", "error": None}
+
 @app.on_event("startup")
 async def startup_event():
     logger.info("Initializing database schemas...")
@@ -70,6 +72,7 @@ async def startup_event():
         import redis
         from rq import Queue, SimpleWorker as Worker
         try:
+            worker_status["status"] = "starting"
             conn = redis.Redis.from_url(settings.REDIS_URL)
             worker = Worker([Queue("default", connection=conn)], connection=conn)
             # Patch signal handler installation to prevent thread errors
@@ -84,13 +87,25 @@ async def startup_event():
             worker.death_penalty_class = ThreadSafeDeathPenalty
             
             logger.info("Starting RQ background worker...")
+            worker_status["status"] = "running"
             worker.work(with_scheduler=True)
         except Exception as e:
+            worker_status["status"] = "failed"
+            worker_status["error"] = str(e)
             logger.error(f"Failed to start RQ background worker: {e}")
 
-    threading.Thread(target=start_worker, daemon=True).start()
+    threading.Thread(target=start_worker, name="RQ-Worker-Thread", daemon=True).start()
     logger.info("Background worker thread started. Ready for requests.")
 
 @app.get("/")
 def read_root():
     return {"status": "online", "app": settings.APP_NAME, "version": settings.API_VERSION}
+
+@app.get("/api/debug-worker")
+def debug_worker():
+    import threading
+    active_threads = [t.name for t in threading.enumerate()]
+    return {
+        "worker_status": worker_status,
+        "active_threads": active_threads
+    }