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