CREATE TABLE IF NOT EXISTS contacts (
    id         BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
    user_id    BIGINT UNSIGNED NOT NULL,
    contact_id BIGINT UNSIGNED NOT NULL,
    nickname   VARCHAR(80)     DEFAULT NULL,
    is_favorite TINYINT(1)    DEFAULT 0,
    synced_at  DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY uq_user_contact (user_id, contact_id),
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (contact_id) REFERENCES users(id) ON DELETE CASCADE,
    INDEX idx_user (user_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS block_list (
    id         BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
    blocker_id BIGINT UNSIGNED NOT NULL,
    blocked_id BIGINT UNSIGNED NOT NULL,
    created_at DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY uq_block (blocker_id, blocked_id),
    FOREIGN KEY (blocker_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (blocked_id) REFERENCES users(id) ON DELETE CASCADE,
    INDEX idx_blocker (blocker_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;