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events: booking cancellation + seat release + 13 tests
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Booking stream carries :booking/:cancel events; live roster is the folded
replay so cancelling frees a seat and capacity reopens. ev/cancel! (retrying
append-expect), no-op on unbooked, cancelled actor may re-book. Capacity count
is folded roster size. 110/110 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
giles
2026-06-07 02:09:58 +00:00
parent 80a2dee22f
commit 9adeff1431
5 changed files with 142 additions and 29 deletions
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11
plans/events-on-sx.md
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@@ -18,7 +18,7 @@ capacity rules, transactional booking, and a flow-driven notification dispatcher
## Status (rolling)
`bash lib/events/conformance.sh` → **97/97** (Phase 1 complete + Phase 2 capacity-safe booking)
`bash lib/events/conformance.sh` → **110/110** (Phase 1 complete + Phase 2 booking + cancellation)
## Ground rules
@@ -64,7 +64,7 @@ lib/events/api.sx ── (events/schedule) (events/book) (events/agenda) ──
## Phase 2 — Ticketing + booking
- [x] capacity rules; transactional booking → `persist` (no overbooking)
- [ ] wire `booking.sx` into `api.sx` (persist-backed `ev/book`)
- [ ] cancellation (tombstone events) + seat release
- [x] cancellation (tombstone events) + seat release
- [ ] paid tickets compose with `commerce` order flow
- [x] tests: capacity edge, double-book guard, conflict detection
@@ -81,6 +81,13 @@ lib/events/api.sx ── (events/schedule) (events/book) (events/agenda) ──
## Progress log
- 2026-06-07 — Cancellation + seat release. Booking stream now carries
:booking / :cancel events; the live roster is the FOLDED replay (book adds,
cancel removes) so capacity reopens when a seat is freed. `ev/cancel!`
(retrying, append-expect), `ev/cancel-with-observed`. Edge cases: cancelling
an unbooked actor → :not-booked (no-op), double cancel → :not-booked,
cancelled actor may re-book. Capacity count is the folded roster size, not
the physical event count. +13 tests, 110/110 green.
- 2026-06-07 — **Phase 2 start: capacity-safe booking.** `booking.sx`: one
append-only persist stream per occurrence; roster = stream replayed. Booking
decisions made against an OBSERVED (roster, last-seq) snapshot, committed via