CREATE TABLE IF NOT EXISTS users (
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(120) NOT NULL,
    email VARCHAR(190) NOT NULL UNIQUE,
    password_hash VARCHAR(255) NOT NULL,
    role ENUM('admin','operator') NOT NULL DEFAULT 'operator',
    active TINYINT(1) NOT NULL DEFAULT 1,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS audit_logs (
    id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    user_id INT UNSIGNED NULL,
    action VARCHAR(80) NOT NULL,
    target VARCHAR(190) NOT NULL,
    status ENUM('success','error','info') NOT NULL DEFAULT 'info',
    details TEXT NULL,
    ip_address VARCHAR(45) NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    INDEX idx_logs_created_at (created_at),
    INDEX idx_logs_target (target),
    CONSTRAINT fk_audit_user
        FOREIGN KEY (user_id) REFERENCES users(id)
        ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;