ALTER TABLE customers ADD COLUMN IF NOT EXISTS "loyaltyPoints" integer DEFAULT 0;
ALTER TABLE customers ADD COLUMN IF NOT EXISTS "loyaltyTier" varchar;
ALTER TABLE customers ADD COLUMN IF NOT EXISTS "vipDiscountPercent" numeric(5,2) DEFAULT 0;
ALTER TABLE customers ADD COLUMN IF NOT EXISTS "vipSince" date;
ALTER TABLE customers ADD COLUMN IF NOT EXISTS "vipBenefits" text;
ALTER TABLE customers ADD COLUMN IF NOT EXISTS "loyaltyHistory" text;