CREATE TABLE IF NOT EXISTS wa_api_tokens (
    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    agent_id BIGINT UNSIGNED NOT NULL,
    token_hash CHAR(64) NOT NULL,
    device_name VARCHAR(150) NULL,
    last_used_at DATETIME NULL,
    expires_at DATETIME NOT NULL,
    revoked_at DATETIME NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY uq_api_token_hash (token_hash),
    KEY idx_api_token_agent (agent_id, revoked_at, expires_at),
    CONSTRAINT fk_api_token_agent FOREIGN KEY (agent_id) REFERENCES wa_agents(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;