-- Migration: Add custom_headers column to campaigns_data table
-- Run this if you have an existing campaigns_data table without the custom_headers column

-- Check if the table exists and add the column if it doesn't exist
ALTER TABLE campaigns_data 
ADD COLUMN IF NOT EXISTS custom_headers TEXT AFTER pdf_attachments;

-- Optional: Add index if needed for performance
-- CREATE INDEX idx_custom_headers ON campaigns_data(custom_headers(255));