Surface Firestore init error via /health for diagnostics

RAG_Products/api.py

@@ -111,6 +111,8 @@ def health():
         "index_loaded": index_ok,
         "llm_key_set": bool(OPENROUTER_API_KEY),
         "detail": detail,
+        "storage_backend": storage.backend(),
+        "storage_init_error": storage.init_error(),
     }
 
 

RAG_Products/storage.py

@@ -29,6 +29,7 @@ _COLLECTION = "chats"
 _lock = threading.Lock()
 _db = None            # Firestore client (or None -> local file)
 _backend = "local"
+_init_error = None    # last Firestore init exception, surfaced via /health
 
 
 def _now():
@@ -37,7 +38,7 @@ def _now():
 
 def _init():
     """Initialise Firestore if credentials are available; else local file."""
-    global _db, _backend
+    global _db, _backend, _init_error
     if _db is not None or _backend == "firestore":
         return
     if FIREBASE_CREDENTIALS or FIREBASE_CREDENTIALS_JSON:
@@ -57,10 +58,16 @@ def _init():
             _backend = "firestore"
             return
         except Exception as e:  # fall back rather than crash
-            print(f"[storage] Firestore init failed ({e}); using local file.")
+            _init_error = f"{type(e).__name__}: {e}"
+            print(f"[storage] Firestore init failed ({_init_error}); using local file.")
     _backend = "local"
 
 
+def init_error():
+    """Last Firestore init exception (for /health diagnostics), or None."""
+    return _init_error
+
+
 def backend() -> str:
     _init()
     return _backend