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Author SHA1 Message Date
1bda137ca4 Add version history UI: list, view, diff, restore (#42)
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Users can see who changed what and restore old states (ADR 0013).

- shared: dependency-free word-level Markdown diff (diffMarkdown) with a
  unit test; PageVersionContentView; PAGE_RESTORE_CHANNEL + PageRestoreRequest.
- api: GET /pages/:id/versions (list), GET .../:versionId (read-only HTML +
  Markdown for diffing), POST .../:versionId/restore. Every route requires
  write access — viewing history is gated like editing (permissions.md).
  Restore checks permission, then emits the page_restore NOTIFY; history is
  append-only (the api never deletes a version).
- collab: a page_restore listener applies the restore on the live document via
  openDirectConnection — it snapshots the current state as a PRE_RESTORE
  version, then replaces the content in one transaction, so every connected
  client converges and the change persists like a normal edit.
- web: HistoryPanel (version list with time/trigger/label/contributors, a
  read-only render of a selected version, a Markdown diff against the current
  page, and a restore action), toggled from the page menu. de+en strings.

Tests: shared diff (added/removed/round-trip/edges); collab restore DB test
(a connected client converges on the restored content; a pre-restore snapshot
is appended alongside the original — append-only); api list/get/restore
(newest-first, rendered content, write-permission gate, restore returns the
target without mutating history).

This completes M3 (real-time collaboration & history, #33–#42).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PGdhRiwU1WRL4XxJfZYipY
2026-07-09 08:53:42 +02:00
6fb6f6fce7 Add version snapshots: automatic, named, thinning (#41)
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Version history is a core kickoff decision (ADR 0013). Snapshots are full,
self-contained encoded Yjs states, so restore never depends on the update
log and compaction (#40) cannot lose history.

(The page_versions / page_pending_contributors tables and base schema
landed a commit early, bundled into 3583a04; this commit completes #41.)

- schema: page_versions gains created_by (editor of manual/pre-restore
  versions; null for automatic snapshots). shared: PageVersionView,
  CreateVersionInput, PageVersionTrigger.
- collab: PostgresVersionStore tracks contributors per open doc (onChange),
  flushes them to the shared page_pending_contributors accumulator on store,
  creates an automatic snapshot on last-participant disconnect (only if
  something changed — no duplicate on a quick reconnect) and every 30
  active-editing minutes. Contributors and snapshot are consumed atomically.
- api: POST /pages/:id/versions creates a named version (write permission,
  label + creator, snapshot reconstructed from persisted state, consumes the
  same contributor accumulator). Daily version-thinning scheduler job keeps
  all versions for 90 days, then the newest auto snapshot per day; manual and
  pre-restore versions are never thinned. pre_restore trigger reserved for #42.

Tests: collab (one auto version on session end with the full two-author
contributor set, none when unchanged, no duplicate on reconnect, interval
snapshot); api (named version stores label+creator, contributor set consumed,
non-owner refused, thinning time-travel keeps newest-per-day beyond window).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PGdhRiwU1WRL4XxJfZYipY
2026-07-09 08:37:07 +02:00