CREATE TABLE asset_assignments (
    id INT AUTO_INCREMENT PRIMARY KEY,
    asset_id INT NOT NULL,
    user_id INT NOT NULL,
    von DATE NOT NULL,
    bis DATE,
    kommentar TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (asset_id) REFERENCES assets(id) ON DELETE CASCADE,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    INDEX idx_asset_id (asset_id),
    INDEX idx_user_id (user_id),
    INDEX idx_von (von),
    INDEX idx_bis (bis)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;