docs: def delete_database(client, db_name, username=None, password=None):
      """Delete Arangodb database
  
      """
  
      (username, password) = get_user_creds(username, password)
  
      sys_db = client.db("_system", username=username, password=password)
  
      try:
          return sys_db.delete_database(db_name)
      except Exception:
          log.warn("No arango database {db_name} to delete, does not exist")