-- 账户与设备
CREATE TABLE users (
  id          BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  uuid        CHAR(36) NOT NULL UNIQUE,
  email       VARCHAR(255) NOT NULL UNIQUE,
  pw_hash     VARCHAR(255) NOT NULL,               -- argon2id
  dp_uuid     CHAR(36) NOT NULL,                   -- 数据面凭证 UUID（可轮换，节点侧只见它）
  status      ENUM('active','banned') NOT NULL DEFAULT 'active',
  created_at  DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE devices (
  id          BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  uuid        CHAR(36) NOT NULL UNIQUE,
  user_id     BIGINT UNSIGNED NOT NULL,
  name        VARCHAR(64) NOT NULL,
  platform    ENUM('ios','android','windows','macos') NOT NULL,
  last_seen   DATETIME(6) NULL,
  created_at  DATETIME(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
  FOREIGN KEY (user_id) REFERENCES users(id),
  INDEX idx_user (user_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;