CREATE TABLE IF NOT EXISTS sessions (
    token VARCHAR(64) PRIMARY KEY,
    account_id VARCHAR(64) NOT NULL UNIQUE,
    browser_id VARCHAR(64) NOT NULL,
    email VARCHAR(320) NOT NULL,
    password_ciphertext TEXT NOT NULL,
    user_hash VARCHAR(128) NOT NULL,
    imap_host VARCHAR(255) NOT NULL,
    imap_port BIGINT NOT NULL,
    imap_tls BIGINT NOT NULL,
    imap_tls_verify BIGINT NOT NULL,
    smtp_host VARCHAR(255) NOT NULL,
    smtp_port BIGINT NOT NULL,
    smtp_tls BIGINT NOT NULL,
    smtp_tls_verify BIGINT NOT NULL,
    timeout_secs BIGINT NOT NULL,
    created_at_unix BIGINT NOT NULL,
    last_accessed_unix BIGINT NOT NULL,
    user_agent VARCHAR(512) NOT NULL DEFAULT '',
    INDEX idx_sessions_browser (browser_id),
    INDEX idx_sessions_user (user_hash),
    INDEX idx_sessions_expiry (last_accessed_unix, timeout_secs)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;