DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1
        FROM pg_trigger
        WHERE tgname = '{{.TriggerName}}'
        AND tgrelid = '{{.SchemaName}}.{{.TableName}}'::regclass
    ) THEN
        CREATE TRIGGER {{.TriggerName}}
        AFTER {{.Events}}
        ON {{.SchemaName}}.{{.TableName}}
        FOR EACH ROW
        EXECUTE FUNCTION {{.SchemaName}}.{{.FunctionName}}();
    END IF;
END;
$$;