ALTER TABLE group_announces ADD FOREIGN KEY (uid) REFERENCES accounts (uid) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE group_announces_read ADD FOREIGN KEY (uid) REFERENCES accounts (uid) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE group_events ADD FOREIGN KEY (uid) REFERENCES accounts (uid) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE group_announces ADD FOREIGN KEY (uid) REFERENCES accounts (uid) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE group_announces_read ADD FOREIGN KEY (uid) REFERENCES accounts (uid) ON DELETE CASCADE ON UPDATE CASCADE;
ALTER TABLE group_events ADD FOREIGN KEY (uid) REFERENCES accounts (uid) ON DELETE CASCADE ON UPDATE CASCADE;