chore: using a database for keys

handler.py

@@ -40,10 +40,10 @@ class EndpointHandler:
             # Get keys
             evaluation_keys = from_json(data.pop("evaluation_keys", data))
 
-            uid = np.random.randint()
+            uid = np.random.randint(2**32)
 
             while uid in self.key_database.keys():
-                uid = np.random.randint()
+                uid = np.random.randint(2**32)
 
             self.key_database[uid] = evaluation_keys