The persisted row (sessionId, key, stateVersion, observedSeq, state)
becomes (sessionId, key, ver, seq, val) — the cache medium repeats these
three names for every unit of every session, so the long forms dominated
the JSON payload. ProjectionCheckpointRow and the checkpointRow zod spec
rename together; the domain spec bumps to v3 (cache semantics: the old
medium is discarded, not migrated). The unit-facing declaration keeps
stateVersion — only the persisted/checkpoint row shape changes.
Review finding (PR #791): rows carried only version/watermark/state, so a
recreated session id, or a persistence store replaced under a surviving
cache, could pass every watermark check and seed state folded from an
unrelated log; a checkpoint racing ahead of an eager log flush could
likewise expose values no stored log contains. Records now store the
header identity (createdAt, cwd) they were folded from — reads validate it
against the live header (listing) or the tail's stored header (cold read)
and discard unrelated records whole (domain version 2 discards v1 media by
the pre-release stance). A live checkpoint additionally flushes the
session's buffered events durably before the cache row lands: the cache
can trail the log, never lead it. cachedValues is reshaped into
cachedSnapshot(meta): the identity witness plus the {asOfSeq, values} cut
the list carrier serves.
gen-cordis-catalog/api, config and persistence catalogs, and doc graphs
regenerated over the new sessionProjectionCache service and the registry's
checkpoint faces. Classifications: ProjectionCheckpoint joins the type-link
exemptions (owned by the projection package source), Partial joins the
foundation names, the cache service gets its capability-seam role row, and
the package takes the one-sentence Model Experience contract (host-side
read-model accelerator, no model surface).
The base's bilingual gate now covers this branch's new README: add the
Chinese counterpart of the session-projection-cache package README, the
cache row on the group README's Chinese side, and re-record the touched
pairs (group, cache, session-persistence — whose English side gained the
readFrom rows earlier on this branch). verify-translation-pairing: 541
pairs consistent.
New package on the domain data form: one session_projcache record per
session (key → {stateVersion, observedSeq, state}), landing beside
workspace.json under the shipped json backend. Write policy: two mandatory
points (turn/end + session disposal) with count/interval throttling between
them (both Config fields required — flush cadence is a deployment choice);
every background write is fail-soft (log + stay stale, self-heal on the
next write or cold read). coldSnapshot(id) runs the read ladder — cached
rows + persistence readFrom from the registry's anchored restore floor +
registry restore + fail-soft write-back — detecting crash-repair-shrunk
logs via the one-below anchor and degrading to a single full re-read.
Mounted in apps/cli/cordis.yml (writeEveryEvents 200 / writeIntervalMs
5000).
