Astarte.DataAccess.Config.put_cassandra_username

You're seeing just the function put_cassandra_username, go back to Astarte.DataAccess.Config module for more information.
Link to this function

put_cassandra_username(value, namespace \\ nil)

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Specs

put_cassandra_username(binary(), Skogsra.Env.namespace()) ::
  :ok | {:error, binary()}

Puts the value to Astarte.DataAccess.Config.cassandra_username/0. Optionally, receives the namespace.