SELECT write_message('a11e9022-e741-4450-bf9c-c4cc5ddb6ea3', 'someStream-123', 'SomeMessageType', '{"someAttribute": "some value"}', '{"metadataAttribute": "some meta data value"}');

ERROR:  function write_message(unknown, unknown, unknown, unknown, unknown) does not exist
LINE 1: SELECT write_message('a11e9022-e741-4450-bf9c-c4cc5ddb6ea3',...
               ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.