upcast.sx: register a pure (event -> event) upcaster per type in an immutable
registry; read-upcast/project-upcast lift legacy events to the current shape on
read so projections see one shape (no version branching, no history rewrite).
upcast-data helper merges new :data fields. 171/171.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
batch.sx: persist/append-batch commits (type at data) specs as one contiguous
block; persist/append-batch-expect checks the stream is still at expected
before writing any event, so the batch is all-or-nothing under a concurrent
writer (conflict is a value, not a partial write). 162/162.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
query.sx: read-between (seq range), read-since/read-window (by :at),
read-by-type, read-where, count-where. Pure scans over persist/read for audit
windows, type filters, since-cursors. 152/152.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
New backend op :streams (from seq high-water marks, so compacted streams still
list), threaded through mem-backend + durable serve/io-backend. catalog.sx:
persist/streams, stream-count, stream-exists?, total-events. 143/143.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
kv.sx: persist/kv-cas sets a key only if its current value equals expected,
else returns {:conflict :expected :actual}; persist/kv-put-new is create-only.
The kv analogue of log append-expect — atomic current-state for sessions, acl
grants, stock counts. 133/133.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
view.sx: persist/view bundles stream + fold + snapshot name; view-attach
subscribes it to a hub so each publish refreshes the snapshot incrementally,
making view-peek an O(1) current read. view-value always folds the tail so it
is never stale. The consumer read-model abstraction (feed indices, audit
rollups, search counters). 122/122.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
recovery.sx: 6-test end-to-end crash/restart of an order ledger (log +
subscription kv read model + snapshot + compaction + invoice blob ref) on the
durable backend; everything survives a restart over the same disk + content
store, seq continues, two restarts converge. Migration notes (mem → durable
under a live subsystem) added to the plan. Roadmap done, 111/111.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
blob.sx: a blob ref is {:cid :size :mime}; the blob store is a separate
injected dependency (perform in prod, mock content store in tests).
persist/blob-store puts bytes and returns only the ref; bytes live in a
content-addressed store (artdag/IPFS). Tests assert refs in log/kv never carry
the bytes + content-address dedup. 105/105.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
durable.sx: io-backend with an injectable transport — persist/durable-backend
performs each op as {:op "persist/..." :args (...)} (kernel suspends, host
resumes); persist/mock-durable services via persist/serve over an in-memory
disk. Identical request shapes mean the whole facet/projection/snapshot/
compaction stack runs unchanged on the durable backend. Crash/restart replay
recovers log+kv+snapshot. 91/91.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Backend now tracks last-seq as a monotonic high-water mark (survives
truncation) and exposes :truncate-through. compaction.sx: persist/compact
checkpoints then drops events with seq <= snapshot seq; should-compact?/
maybe-compact give an explicit every-N policy. Determinism: post-compaction
replay value == uncompacted full replay. Phase 3 complete, 76/76.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
snapshot.sx: snapshot is a projection state {:value :seq} stored in kv under
snapshot/<name>. persist/checkpoint replays and saves; persist/replay folds
only the tail after the snapshot. Tests assert snapshot+tail == full replay
both ways + determinism. 65/65.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
concurrency.sx: persist/append-expect refuses an append when the stream
advanced past the caller's expected seq, returning {:conflict :expected
:actual} instead of crashing or overwriting. persist/conflict? + accessors.
Phase 2 complete, 54/54.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
project.sx: projection state {:value :seq}; persist/project folds the whole
stream, persist/project-resume folds only the tail so read models update
incrementally. Pure step (value event)->value. 37/37.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
