timescaledb/sql/main/cluster_user_triggers.sql

-- Creates users on all cluster nodes when added.
-- (UPDATEs and DELETEs are errors)
CREATE OR REPLACE FUNCTION _iobeamdb_internal.on_change_cluster_user()
    RETURNS TRIGGER LANGUAGE PLPGSQL AS
$BODY$
DECLARE
    node_row _iobeamdb_catalog.node;
    meta_row _iobeamdb_catalog.meta;
BEGIN
    IF TG_OP <> 'INSERT' THEN
        PERFORM _iobeamdb_internal.on_trigger_error(TG_OP, TG_TABLE_SCHEMA, TG_TABLE_NAME);
    END IF;

    --NOTE:  creating the role should be done outside this purview. Permissions are complex and should be set by the DBA
    -- before creating the cluster user

    FOR node_row IN
    SELECT *
    FROM _iobeamdb_catalog.node
    WHERE database_name <> current_database()
    LOOP
        PERFORM _iobeamdb_internal.create_user_mapping(NEW, node_row.server_name);
    END LOOP;

    FOR meta_row IN
    SELECT *
    FROM _iobeamdb_catalog.meta
    LOOP
        PERFORM _iobeamdb_internal.create_user_mapping(NEW, meta_row.server_name);
    END LOOP;
    RETURN NEW;

END
$BODY$;