cartodb-postgresql/scripts-available/CDB_Username.sql

-- Returns the cartodb username of the current PostgreSQL session
CREATE OR REPLACE FUNCTION @extschema@.CDB_Username()
RETURNS text
AS $$
  SELECT @extschema@.CDB_Conf_GetConf(concat('api_keys_', session_user))->>'username';
$$  LANGUAGE SQL
    STABLE
    PARALLEL SAFE
    SECURITY DEFINER
    SET search_path = @extschema@, pg_temp;