CREATE RULE bounded_message_queue AS ON INSERT TO messages DO ALSO DELETE FROM messages WHERE id IN (SELECT id FROM messages WHERE destination = NEW.destination AND destination_device = NEW.destination_device ORDER BY timestamp DESC OFFSET 5000); DROP RULE bounded_message_queue ON messages; CREATE RULE bounded_message_queue AS ON INSERT TO messages DO ALSO DELETE FROM messages WHERE id IN (SELECT id FROM messages WHERE destination = NEW.destination AND destination_device = NEW.destination_device ORDER BY timestamp DESC OFFSET 1000); DROP RULE bounded_message_queue ON messages; CREATE RULE bounded_message_queue AS ON INSERT TO messages DO ALSO DELETE FROM messages WHERE id IN (SELECT id FROM messages WHERE destination = NEW.destination AND destination_device = NEW.destination_device ORDER BY timestamp DESC OFFSET 1000); DROP RULE bounded_message_queue ON messages; CREATE RULE bounded_message_queue AS ON INSERT TO messages DO ALSO DELETE FROM messages WHERE id IN (SELECT id FROM messages WHERE destination = NEW.destination AND destination_device = NEW.destination_device ORDER BY timestamp DESC OFFSET 1000); DROP RULE bounded_message_queue ON messages; CREATE RULE bounded_message_queue AS ON INSERT TO messages DO ALSO DELETE FROM messages WHERE id IN (SELECT id FROM messages WHERE destination = NEW.destination AND destination_device = NEW.destination_device ORDER BY timestamp DESC OFFSET 1000); CREATE INDEX CONCURRENTLY guid_index ON messages (guid);