CREATE TABLE users (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  first_name VARCHAR(80) NOT NULL,
  last_name VARCHAR(80) NOT NULL,
  email VARCHAR(255) NOT NULL,
  password_hash VARCHAR(255) NOT NULL,
  status VARCHAR(20) NOT NULL DEFAULT 'active',
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  last_login_at DATETIME NULL,
  PRIMARY KEY (id),
  UNIQUE KEY uq_users_email (email)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE sessions (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
  user_id BIGINT UNSIGNED NOT NULL,
  token_hash CHAR(64) NOT NULL,
  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
  expires_at DATETIME NOT NULL,
  revoked TINYINT(1) NOT NULL DEFAULT 0,
  revoked_at DATETIME NULL,
  PRIMARY KEY (id),
  UNIQUE KEY uq_sessions_token_hash (token_hash),
  KEY ix_sessions_user_id (user_id),
  KEY ix_sessions_expires_at (expires_at),
  CONSTRAINT fk_sessions_user FOREIGN KEY (user_id)
    REFERENCES users(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;