-- Backfill nullable rows before enforcing NOT NULL.
UPDATE "deliverables" SET "start_date" = "created_at" WHERE "start_date" IS NULL;
UPDATE "deliverables"
SET "expected_end_date" = "start_date" + INTERVAL '7 days'
WHERE "expected_end_date" IS NULL;

-- AlterTable
ALTER TABLE "deliverables" ALTER COLUMN "start_date" SET NOT NULL,
ALTER COLUMN "expected_end_date" SET NOT NULL;