Improve admin Mongo database detection and error messages

api/main.py

@@ -70,21 +70,26 @@ def _init_admin_mongo() -> None:
         return
     try:
         admin_client = MongoClient(ADMIN_MONGO_URI)
-        try:
-            admin_db = admin_client.get_default_database() or admin_client["admin"]
-        except Exception:
+        # get_default_database() extracts database from connection string (e.g., /adminPanel)
+        admin_db = admin_client.get_default_database()
+        if admin_db is None:
+            # Fallback if no database in URI
             admin_db = admin_client["admin"]
+            log.warning("No database in connection string, defaulting to 'admin'")
+        
         admin_media_clicks = admin_db["media_clicks"]
+        log.info(
+            "Admin media click logging initialized: db=%s collection=%s",
+            admin_db.name,
+            admin_media_clicks.name,
+        )
         try:
             admin_media_clicks.drop_index("user_id_1_header_1_media_id_1")
             log.info("Dropped legacy index user_id_1_header_1_media_id_1")
         except Exception as idx_err:
-            log.info("Skipping legacy index drop: %s", idx_err)
-        log.info(
-            "Admin media click logging enabled on db=%s collection=%s",
-            admin_media_clicks.database.name,
-            admin_media_clicks.name,
-        )
+            # Index drop failure is non-critical (often permission issue)
+            if "Unauthorized" not in str(idx_err):
+                log.info("Skipping legacy index drop: %s", idx_err)
     except Exception as err:
         log.error("Failed to init admin Mongo client: %s", err)
         admin_media_clicks = None
@@ -204,7 +209,16 @@ def log_media_click(user_id: Optional[str], category_id: Optional[str]) -> None:
                 }
             )
     except Exception as err:
-        log.warning("Admin media click logging failed: %s", err)
+        err_str = str(err)
+        if "Unauthorized" in err_str or "not authorized" in err_str.lower():
+            log.warning(
+                "Admin media click logging failed (permissions): user lacks read/write on db=%s collection=%s. "
+                "Check MongoDB user permissions.",
+                admin_media_clicks.database.name,
+                admin_media_clicks.name,
+            )
+        else:
+            log.warning("Admin media click logging failed: %s", err)
 
 
 @app.get("/")