Audit #6 and #8, applied to the docs store — the same two bugs KV had, in
the same two places.
Per-app docs (#6): create/update/delete wrote the row, then emitted
best-effort. An outbox failure left a committed doc whose trigger never
fired. They now go through `atomic_write::DocsWriter`, whose Postgres impl
writes and fans out on one connection in one transaction.
Group docs (#8): the service read `count_rows`/`projected_total_bytes` on
pooled connections and wrote on another, so concurrent creators each saw the
same pre-write count and together overshot the ceiling.
`PostgresGroupDocsWriter` takes a per-group advisory lock — on its OWN
`docs`-namespaced key, so it serializes against other docs writers to that
group but not against KV writers, which draw on a separate ceiling.
The bespoke `check_total_bytes` (with its own copy of the upper-bound fast
path) is gone; group docs now shares `group_quota::check_group_write` with
group KV, so the row ceiling, the projected-bytes ceiling, and the fast path
that skips the O(n) SUM scan have exactly one implementation between them.
tests/atomic_write.rs gains the docs row-quota race (16 concurrent creators
against a ceiling of 4).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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