metaforecast/prisma/migrations/20220519104640_new_timestamps/migration.sql

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-- questions
ALTER TABLE "questions"
ADD COLUMN "fetched" TIMESTAMP(6),
ADD COLUMN "first_seen" TIMESTAMP(6);
UPDATE "questions"
SET "fetched" = "timestamp", "first_seen" = "timestamp";
ALTER TABLE "questions"
ALTER COLUMN "fetched" SET NOT NULL,
ALTER COLUMN "first_seen" SET NOT NULL;
-- history
ALTER TABLE "history"
ADD COLUMN "fetched" TIMESTAMP(6);
UPDATE "history" SET "fetched" = "timestamp";
ALTER TABLE "history"
ALTER COLUMN "fetched" SET NOT NULL;
-- populate first_seen
UPDATE questions
SET "first_seen" = h.fs
FROM (
SELECT id, MIN(fetched) AS fs FROM history GROUP BY id
) as h
WHERE questions.id = h.id;