Make email and phone fields required in color requests

database/migrations/018_make_contact_fields_required.sql

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+-- Migration: Make email and phone fields required in color_requests table
+-- These fields are now mandatory for all color requests
+
+-- First, update any existing NULL values to prevent constraint violation
+UPDATE color_requests 
+SET user_email = 'unknown@example.com' 
+WHERE user_email IS NULL;
+
+UPDATE color_requests 
+SET user_phone = 'unknown' 
+WHERE user_phone IS NULL;
+
+-- Now add NOT NULL constraints
+ALTER TABLE color_requests 
+ALTER COLUMN user_email SET NOT NULL;
+
+ALTER TABLE color_requests 
+ALTER COLUMN user_phone SET NOT NULL;
+
+-- Update comments to reflect the requirement
+COMMENT ON COLUMN color_requests.user_email IS 'User email address for contact (required)';
+COMMENT ON COLUMN color_requests.user_phone IS 'User phone number for contact (required)';