tlaitinen/has_role SQL function

## has_role SQL function
CREATE FUNCTION has_role (userId BIGINT, userGroupId BIGINT, role TEXT)
RETURNS BOOLEAN
AS
$$
SELECT EXISTS (
  SELECT 1
  FROM role
  WHERE user_id = $1
    AND user_group_id = $2
    AND role = $3
    AND active = true
)
$$
LANGUAGE SQL
STABLE
STRICT;
	CREATE FUNCTION has_role (userId BIGINT, userGroupId BIGINT, role TEXT)
	RETURNS BOOLEAN
	AS
	$$
	SELECT EXISTS (
	SELECT 1
	FROM role
	WHERE user_id = $1
	AND user_group_id = $2
	AND role = $3
	AND active = true
	)
	$$
	LANGUAGE SQL
	STABLE
	STRICT;