ALTER TABLE customer_applications ADD COLUMN approval_level INT DEFAULT 1;
ALTER TABLE customer_applications ADD COLUMN current_approver_role_id INT;
CREATE TABLE IF NOT EXISTS application_approvals (
    id INT AUTO_INCREMENT PRIMARY KEY,
    application_id INT NOT NULL,
    approver_id INT NOT NULL,
    approval_level INT NOT NULL,
    status VARCHAR(255) NOT NULL,
    comments TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (application_id) REFERENCES customer_applications(id),
    FOREIGN KEY (approver_id) REFERENCES users(id)
);