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* docs(cluster): RFC-004 — graph & schema apply design (Phase 4)
The design the implementation spec's exit criteria require before
graph-moving cluster apply ships. Core positions:
- Cluster recovery is roll-forward-only: the engine's own sidecars make every
graph-level operation atomic within the graph, so the cluster never rolls a
graph back — its sidecars (__cluster/recoveries/{ulid}.json) classify and
record, converging the ledger to observable reality (axiom 5) or surfacing
a loud pending-repair condition. Eight-row decision matrix, every row
testable with the Stage 3B failpoint harness.
- Irreversible operations (graph delete, allow_data_loss schema apply)
consume digest-bound approval artifacts written by a new cluster approve
command and retired into state.approval_records (axiom 11). A stale
approval can never authorize a different change.
- cluster apply gains an actor, threaded to apply_schema_as so engine Cedar
enforcement and commit attribution work unchanged; the cluster adds no
policy engine of its own.
- Deterministic ordering (creates -> schema applies -> catalog -> deletes),
per-resource apply groups, cross-graph atomicity explicitly not promised.
- Staged 4A graph create / 4B schema apply / 4C graph delete, each gated on
per-matrix-row failpoint tests.
Answers exit criteria 2 and 4 fully, 1/5/6 partially; 3/7/8/9 deferred to
their phases (coverage table in the RFC). Linked from the dev index and the
implementation spec's Phase 4 section.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* docs(cluster): RFC-004 review fixes — graph_delete sweep rows, state_cas_base contract
Two greptile findings: (1) D3 row 2 could not be evaluated for graph_delete
(no manifest to version-check after prefix removal) and 'root absent, state
already tombstoned' fell into the stale row — split into rows 7 (delete's
analog of row 2) and 7b (the roll-forward), with expected_manifest_version
documented as always null for the delete kind. (2) state_cas_base is now
explicitly audit/diagnostics-only — the sweep never consults it; independent
state mutations are handled by the ordinary CAS like any concurrent write.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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