Improve SQL compliance of group user add query

INSERT INTO group_edge (source_id, position, updated_at, destination_id, state)

SELECT data.id, data.position, data.updated_at, data.destination, data.state

FROM (

  SELECT $1::BYTES AS id, $2::INT AS position, $2::INT AS updated_at, $3::BYTES AS destination, 1 AS state

  SELECT $1::BYTEA AS id, $2::INT AS position, $2::INT AS updated_at, $3::BYTEA AS destination, 1 AS state

  UNION ALL

  SELECT $3::BYTES AS id, $2::INT AS position, $2::INT AS updated_at, $1::BYTES AS destination, 1 AS state

  SELECT $3::BYTEA AS id, $2::INT AS position, $2::INT AS updated_at, $1::BYTEA AS destination, 1 AS state

) AS data

WHERE

  EXISTS (SELECT source_id FROM group_edge WHERE source_id = $1::BYTES AND destination_id = $4::BYTES AND state = 0)

  EXISTS (SELECT source_id FROM group_edge WHERE source_id = $1::BYTEA AND destination_id = $4::BYTEA AND state = 0)

AND

  EXISTS (SELECT id FROM groups WHERE id = $1::BYTES AND disabled_at = 0)

  EXISTS (SELECT id FROM groups WHERE id = $1::BYTEA AND disabled_at = 0)

ON CONFLICT (source_id, destination_id)

DO UPDATE SET state = 1, updated_at = $2::INT`,

		groupID.Bytes(), nowMs(), userID.Bytes(), session.userID.Bytes())