added unique indexing to name-attribute

src/database/database.py

@@ -17,6 +17,5 @@ def connect():
     client = MongoClient(os.getenv("MONGO_HOST"))
     db = client[os.getenv("MONGO_DB")]
     collection = db[os.getenv("MONGO_COLLECTION")]
+    collection.create_index("name", unique=True)
     return collection, db, client
-
-