Add Column
Current Schema
CREATE TABLE voucher_delivery_logs (
id INTEGER PRIMARY KEY AUTOINCREMENT,
purchase_id INTEGER NOT NULL,
phone TEXT NOT NULL,
status TEXT NOT NULL CHECK (status IN ('sent', 'failed', 'error')),
error_message TEXT,
created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
FOREIGN KEY (purchase_id) REFERENCES voucher_purchases (id) ON DELETE CASCADE
)