ALTER TABLE "CampaignRecipient" ADD COLUMN "sendAttempts" INTEGER NOT NULL DEFAULT 0;
ALTER TABLE "CampaignRecipient" ADD COLUMN "maxSendAttempts" INTEGER NOT NULL DEFAULT 3;
ALTER TABLE "CampaignRecipient" ADD COLUMN "lastAttemptAt" DATETIME;
ALTER TABLE "CampaignRecipient" ADD COLUMN "nextRetryAt" DATETIME;