upd db name

app/db.py

@@ -1,4 +1,3 @@
-
 # app/db.py
 import motor.motor_asyncio
 from gridfs import GridFSBucket
@@ -6,5 +5,6 @@ import os
 
 MONGO_URI = os.getenv("MONGODB_URI")
 client = motor.motor_asyncio.AsyncIOMotorClient(MONGO_URI)
-db = client.get_default_database()
+MONGO_DB_NAME = os.getenv("MONGODB_DB", "querysearcher") # fallback default
+db = client[MONGO_DB_NAME]
 grid_fs_bucket = GridFSBucket(db)