ALTER TABLE `OfferRequests`
  ADD COLUMN IF NOT EXISTS `OwnerPhone` VARCHAR(30) NOT NULL DEFAULT '' AFTER `Emerg`,
  ADD COLUMN IF NOT EXISTS `ConvertedOfferID` INT NULL AFTER `EnteredByUserId`,
  ADD COLUMN IF NOT EXISTS `ConvertedAt` DATETIME NULL AFTER `ConvertedOfferID`,
  ADD COLUMN IF NOT EXISTS `ApprovedBy1` VARCHAR(255) NULL AFTER `ConvertedAt`,
  ADD COLUMN IF NOT EXISTS `ApprovedBy2` VARCHAR(255) NULL AFTER `ApprovedBy1`,
  ADD INDEX IF NOT EXISTS `idx_offer_requests_converted_offer` (`ConvertedOfferID`);
