CREATE TABLE leave_requests (
    leave_id INT PRIMARY KEY AUTO_INCREMENT,
    user_id INT NOT NULL,
    branch_id INT NOT NULL,
    start_date DATE NOT NULL,
    end_date DATE NOT NULL,
    reason VARCHAR(255) DEFAULT NULL,
    status ENUM('pending', 'approved', 'rejected') NOT NULL DEFAULT 'pending',
    date_created TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(user_id) ON DELETE CASCADE,
    FOREIGN KEY (branch_id) REFERENCES branches(branch_id) ON DELETE CASCADE,
    INDEX idx_user_id (user_id),
    INDEX idx_branch_id (branch_id),
    INDEX idx_status (status),
    INDEX idx_start_date (start_date)
);