ALTER TABLE `user` ADD COLUMN `password_changed_at` DATETIME NULL COMMENT '密码最后修改时间' AFTER `last_login`;

CREATE TABLE IF NOT EXISTS `user_login_session` (
    id BIGINT PRIMARY KEY COMMENT '主键 ID',
    user_id BIGINT NOT NULL COMMENT '所属用户 ID',
    access_token_id VARCHAR(64) NOT NULL COMMENT '访问令牌 ID',
    refresh_token_id VARCHAR(64) NOT NULL COMMENT '刷新令牌 ID',
    user_agent VARCHAR(512) COMMENT '客户端 User-Agent',
    ip VARCHAR(64) COMMENT '客户端 IP 地址',
    last_active_at DATETIME NOT NULL COMMENT '最后活跃时间',
    expires_at DATETIME NOT NULL COMMENT '过期时间戳',
    revoked_at DATETIME COMMENT '撤销时间',
    created_at DATETIME COMMENT '创建时间',
    UNIQUE KEY uk_session_access (access_token_id),
    UNIQUE KEY uk_session_refresh (refresh_token_id),
    KEY idx_session_user_active (user_id, revoked_at, expires_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS `invoice_profile` (
    id BIGINT PRIMARY KEY COMMENT '主键 ID',
    user_id BIGINT NOT NULL COMMENT '所属用户 ID',
    title VARCHAR(128) NOT NULL COMMENT '发票抬头',
    taxpayer_number VARCHAR(64) NOT NULL COMMENT '纳税人识别号',
    email VARCHAR(128) NOT NULL COMMENT '电子邮箱',
    is_default TINYINT DEFAULT 0 COMMENT '是否默认发票信息',
    created_at DATETIME COMMENT '创建时间',
    updated_at DATETIME COMMENT '更新时间',
    KEY idx_invoice_profile_user (user_id, is_default)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE IF NOT EXISTS `invoice_request` (
    id BIGINT PRIMARY KEY COMMENT '主键 ID',
    user_id BIGINT NOT NULL COMMENT '所属用户 ID',
    order_id BIGINT NOT NULL COMMENT '订单 ID',
    amount DECIMAL(10,2) NOT NULL COMMENT '开票金额',
    title VARCHAR(128) NOT NULL COMMENT '发票抬头',
    taxpayer_number VARCHAR(64) NOT NULL COMMENT '纳税人识别号',
    email VARCHAR(128) NOT NULL COMMENT '电子邮箱',
    status VARCHAR(16) DEFAULT 'pending' COMMENT '业务状态',
    invoice_number VARCHAR(64) COMMENT '发票号码',
    admin_remark VARCHAR(256) COMMENT '管理员备注',
    requested_at DATETIME COMMENT '申请时间',
    processed_at DATETIME COMMENT '处理时间',
    UNIQUE KEY uk_invoice_order (order_id),
    KEY idx_invoice_request_user (user_id, requested_at),
    KEY idx_invoice_request_status (status, requested_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE INDEX idx_download_log_user_created ON download_log (user_id, created_at DESC);