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feat(server): the review log, synced and append-only

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ReviewLog keeps every rating of a card: the card, the rating (FSRS's 1 again to 4 easy), when (UTC) and how long answering took, as decided. It is never changed; each device derives a card's schedule by replaying its reviews, so reviews from different devices never conflict. No device id: the sync engine knows each row's device.

The migration (by CLI) only adds: the table, an index on spaceId for space deletion, one for a card's reviews in time order, and the foreign keys (from the space with ON DELETE CASCADE; from the card with ON DELETE CASCADE, DEFERRABLE INITIALLY DEFERRED).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>
This commit is contained in:
Tizian 「ティツィアーン」 2026-09-30 16:59:07 +02:00
commit 5334a0baa5
Signed by: raisondetredev
GPG key ID: 07F6FCF405488B64
1 changed files with 15133 additions and 0 deletions
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halkyon_learn_server/migrations/migration_registry.txt
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@ -7,3 +7,4 @@
20260916165410927
20260930094729362-studysets
20260930122235111-cards
20260930145136285-reviews