ALTER TABLE "crm_leads"
  ADD COLUMN IF NOT EXISTS "description" text,
  ADD COLUMN IF NOT EXISTS "product_type" text,
  ADD COLUMN IF NOT EXISTS "priority" text,
  ADD COLUMN IF NOT EXISTS "estimated_value" double precision,
  ADD COLUMN IF NOT EXISTS "assigned_sales_owner_id" text,
  ADD COLUMN IF NOT EXISTS "assigned_at" timestamp with time zone,
  ADD COLUMN IF NOT EXISTS "assigned_by" text,
  ADD COLUMN IF NOT EXISTS "assignment_remark" text;
