CREATE TABLE IF NOT EXISTS club_invitations (
 invitation_serial BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
 club_serial BIGINT UNSIGNED NOT NULL,
 invite_email VARCHAR(100) NOT NULL,
 membership_role ENUM('member','administrator') NOT NULL DEFAULT 'member',
 invited_by BIGINT UNSIGNED NOT NULL,
 invitation_status ENUM('pending','accepted','revoked') NOT NULL DEFAULT 'pending',
 expires_at DATETIME NOT NULL,
 sent_at DATETIME NOT NULL,
 accepted_at DATETIME NULL,
 UNIQUE KEY (club_serial,invite_email),
 FOREIGN KEY (club_serial) REFERENCES clubs(club_serial) ON DELETE RESTRICT,
 FOREIGN KEY (invited_by) REFERENCES users(user_serial) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
CREATE TABLE IF NOT EXISTS club_tickets (
 ticket_serial BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
 club_serial BIGINT UNSIGNED NOT NULL,
 user_serial BIGINT UNSIGNED NOT NULL,
 subject VARCHAR(200) NOT NULL,
 ticket_status ENUM('open','closed') NOT NULL DEFAULT 'open',
 created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
 updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
 INDEX (club_serial,user_serial,ticket_serial),
 FOREIGN KEY (club_serial) REFERENCES clubs(club_serial) ON DELETE RESTRICT,
 FOREIGN KEY (user_serial) REFERENCES users(user_serial) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
CREATE TABLE IF NOT EXISTS club_ticket_messages (
 message_serial BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
 ticket_serial BIGINT UNSIGNED NOT NULL,
 author_serial BIGINT UNSIGNED NOT NULL,
 message_text TEXT NOT NULL,
 created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
 FOREIGN KEY (ticket_serial) REFERENCES club_tickets(ticket_serial) ON DELETE RESTRICT,
 FOREIGN KEY (author_serial) REFERENCES users(user_serial) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;