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Three storage changes the reworked app needs, as migration 8. Progress. "Which unit is current" was a 'now' state on each unit's row. Two devices that advanced could leave two of them, and leaving a finished unit through the roadmap panel wrote it back to 'todo' — goToUnit un-finished work. Where he is now lives in one place, meta road.unit; a unit's row records only what is true of that unit: done, confidence, and room for the answer count and the tutor's note that earned progress needs. The migration carries the most recently written 'now' row across with its own stamp. Chat. Turn ids were INTEGER PRIMARY KEY — max+1 on whichever device wrote them, restarting at 1 after a clear — so two devices continuing a lesson both wrote turn 201 and sync treated two different turns as one row. Ids are UUIDv7 now, and the transcript is ordered by (created_at, id). Existing turns become legacy:<device>:<n>, zero-padded so turns sharing a timestamp keep the order they were written in; their tombstones are renamed with them. The learner model gets its tables: evidence (lib/srs.js's record, plus the rounds of the first and last CORRECT answer, which PORT.md measures and lib does not), confusion, and phase_ledger for the 다지기 checklist, with a confirmed flag so putting an item back is an edit rather than a delete. A roadmap reset now clears the ledger and road.*; a full wipe also clears evidence, confusions and learner.* — the artifact's wipe left its round counter and confusion list behind. What a learner knows about words survives a roadmap-only reset, as it should. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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