probes: canonical temporal identity and the old-path change set - #1209
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…ails Two pre-registered probes for the temporal-architecture recovery, plus their STATUS_BOARD rows. D-TEMPORAL-1 measures whether canonical address identity survives the cycle store's round trip: NodeGuid -> NodeRow -> NodeRowPacket::as_le_bytes -> cycle commit -> drop writer -> reopen -> scan_image. Green on both rails. Payload bytes are byte-exact across two cycles and a reopen, payload[0..16] is the submitted NodeGuid, the value slab travels too (so the equality is not a degenerate zero-match), each cycle mints exactly base+1, and the head is recovered after restart. Keys are minted through mint_for(classid_read_mode(c).tail_variant, ...) rather than a hardcoded constructor, so the fixture cannot silently test only the deprecated V1 tail. D-TEMPORAL-1a pins the false-green that motivates the two-rail shape: 256 V3 addresses varying only in leaf present as 256 distinct keys and 256 distinct to_hex_v2() decodes, but as ONE distinct identity() -- the V1 accessor reads bytes 13..16 of a V3 key. The same test pins the other half, which is not a defect: local_key_v2 also yields one across that set, because leaf is the 4th HHTL routing tier and belongs to the addressing prefix, not the basin-local key. Choosing the wrong V3 accessor fails the same way as choosing the V1 one. D-V3-MINT-1 checks a gate asymmetry rather than assuming it: mint_for's V2/V3 arm is gated on guid-v2-tail, which is not in default, while the registry's V3 entries are gated on guid-v3-tail, which is. The implication holds -- guid-v3-tail = ["guid-v2-tail"] -- so a V3-registered classid does mint a V3 key by default. The probe discriminates on leaf, which the V3 arm forwards to new_v2 and the V1 fallback discards, so it keeps working if the feature graph is ever flattened. Scope stated where it is recorded: these prove byte and address fidelity of the store, not production reachability. LanceCycleWriter still has zero non-test callers. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012wrzeZAdwGYTCKoxamwQht
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📝 WalkthroughWalkthroughThe pull request adds probes for V3 mint reachability, canonical V3 and V1 witness identity persistence, and old-path graph diffs. It also updates migration status records and the supersession index. ChangesMigration validation
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to The removal probe can pass without validating removal handling, and the migration ledger is out of its required audit order. Fix both before relying on this validation update. Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 52.94% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 17 functions across 3 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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…ference The `Supersession index is current` gate went red on this branch. The cause is this PR's own: the index counts references per ruled symbol, and the new canonical-witness probe calls `persist_cycle`, moving its plan-reference count from 10 to 11. Regenerated with the documented command and verified idempotent (a second run diffs clean). The prediction in the PR body that this gate would not fire was wrong. It read the index's board inputs as `entries/*.md` + `EPIPHANIES.md` and concluded a STATUS_BOARD-only change could not move it — but `crates/` is also an input, and adding a test that calls a ruled symbol is a `crates/` change. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012wrzeZAdwGYTCKoxamwQht
TEST E asked whether store B's version-to-version comparison can produce
inserted / updated / removed without any lance delta API. It can.
With V1={A,B,D} and V2={A,B',C}, GraphDiff reports inserted={C} and
updated={B}. It has no removed-nodes field, and D appears nowhere in it — but
the probe recomputes removed={D} from exactly the two seal maps diff() already
materialises before throwing their difference away. So the gap is an API
omission, not information the store lost.
The seal gate is exercised on both sides: a removal reads Staunen, a version
compared against itself reads Wisdom. An unchanged node A is asserted to appear
in neither change set, so "updated" cannot degenerate into "present".
This makes historical snapshot comparison the correctness oracle for the
changed set. Native lance delta, wherever it works, is an accelerator measured
against this, not a replacement for it.
The companion probe test_c_cycle_payload_roundtrip.rs was written alongside
this one and is deliberately NOT landed: D-TEMPORAL-1 already proves the
stronger V1/V3 byte, address, restart and version result, and a second green
test of the same claim adds review cost without adding a falsifier.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012wrzeZAdwGYTCKoxamwQht
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In @.claude/board/STATUS_BOARD.md:
- Around line 20-23: Update STATUS_BOARD.md to prepend the new governance rows
D-TEMPORAL-1, D-TEMPORAL-1a, D-V3-MINT-1, and D-TEMPORAL-2 above the existing
D-LNC-* entries, preserving their current order and leaving all historical rows
otherwise unchanged.
In `@crates/lance-graph/tests/test_e_old_diff_tripartite.rs`:
- Around line 193-197: Update the graph seal assertion in the test around
graph.graph_seal_check to use a version pair where all retained nodes have
identical seals and only node D is removed, ensuring the expected Staunen status
is caused exclusively by removal rather than the earlier B update or C
insertion.
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CodeRabbit flagged that the removal probe could pass without validating removal
handling. It was right.
graph_seal_check returns on its FIRST divergence while walking to_seals, so on
V1={A,B,D} -> V2={A,B',C} the update to B or the insert of C tripped it long
before the removal branch ran. The assertion "a removal is Staunen" would have
held identically with that branch deleted outright, which makes it a guard that
cannot distinguish what it claims to test.
Adds V3={A,B'} — V2 minus C, nothing else touched — so the Staunen arm now runs
on a transition whose only change is a removal. That reaches the removal branch
or nothing does.
The isolation also sharpens the blind spot rather than merely documenting it:
for a pure removal GraphDiff is entirely empty AND its own seal_status reads
Wisdom, while graph_seal_check calls the same version pair Staunen. The two
surfaces disagree, which is a stronger statement than "the removed set is
missing".
Also moves the four new STATUS_BOARD rows to the section's append point; they
were inserted mid-table because the patch anchored on a convenient unique
string rather than on the ordering convention. Doc comments added to the nine
undocumented test helpers, each stating a contract rather than narrating.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012wrzeZAdwGYTCKoxamwQht
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The merged-PR obligation for #1209, which was not hygiene-only: it landed three probes and a correction, so it gets both records. LATEST_STATE carries the ruling (R4 with an R1 core) and the reason the PR existed: an earlier pass measured VersionedGraph/NodeSchema and reported it as the addressed architecture, having never opened cycle_sink.rs. The arc entry carries the corrections, including the two assertions I got wrong about local_key_v2, the CI-falsified prediction about the supersession index, the CodeRabbit seal-confound that was real, and the CodeRabbit board-ordering finding that was not, with the three commits that measure the convention. The production-reachability caveat is recorded in both places and must ride with any citation of the ruling: the architecture survived the migration; its concrete writer still has zero non-test callers. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012wrzeZAdwGYTCKoxamwQht
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…3jfrn board: post-merge records for #1209
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Three pre-registered probes from the temporal-architecture recovery, plus their
STATUS_BOARDrows and the index regeneration the gate requires. No source changes — tests and board only.Why
An earlier pass in this session measured
VersionedGraph/NodeSchema(node_id:u32+ planes + seals) and reported it as the addressed architecture. That was the wrong store, and promoting an older secondary representation into the architecture is the failure mode this PR exists to correct with measurements.The canonical temporal store is
graph/cycle_sink.rs(PR #911,8a5be505), whose birth commit states the invariant directly — "one detached cycle batch → ONE official Lance commit → exactly one real DatasetVersion base+1" — withEPISODIC_WITNESS_BYTES = 512andpayload: FixedSizeBinary(512)documented askey(16) | edges(16) | value(480).D-TEMPORAL-1 — canonical identity through the cycle store
GREEN on both tails: payload bytes byte-exact across two cycles and a reopen;
payload[0..16] == G.as_bytes(); the value slab travels too, so the equality is not a degenerate zero-match; each cycle mints exactlybase + 1; head recovered after restart.Keys are minted through
mint_for(classid_read_mode(c).tail_variant, …), never a hardcoded constructor, so the fixture cannot silently test only the deprecated V1 tail. V1 (CLASSID_OSINT) is a read-side legacy control only; no new unit is minted V1.Two Arrow claims are kept apart deliberately: the schema's column 0 is
kind, not an address. The address claim is about the first 16 bytes of theFixedSizeBinary(512)payload blob.D-TEMPORAL-1a — the pinned false-green
256 V3 addresses varying only in
leaf:to_hex_v2()identity()local_key_v2()The third row is the defect being pinned: byte fidelity does not imply address fidelity. The fourth is not a defect and is pinned so nobody "fixes" it —
leafis a routing tier (bytes 10..12), part of the addressing prefix, deliberately outside the basin-local key (bytes 12..16).So "use the V3 accessor" is under-specified: V3 has two valid projections (full routing address, basin-local address) and neither should be corrected into the other. Both assertions carry a note not to update the numbers if they break, but to re-audit the call sites.
D-V3-MINT-1 — a gate asymmetry, checked rather than assumed
mint_for's V2/V3 arm is gated onguid-v2-tail, not indefault; the registry's V3 entries are gated onguid-v3-tail, which is. Two different features, so premise and conclusion can come apart — andmint_for's doc justifies its V1 fallback as dead code on exactly that premise.No defect.
guid-v3-tail = ["guid-v2-tail"](Cargo.toml:69), so the implication holds. Measured, not inferred:tail_variant=V3 guid-v3-tail=true guid-v2-tail=true leaf_is_live=true, key bytes showing the V2/V3 carving withleaflive at byte 10. The probe discriminates onleaf(the V3 arm forwards it tonew_v2; the V1 fallback discards it), so it stays valid if the feature graph is ever flattened.D-TEMPORAL-2 — the old snapshot path is the correctness oracle
V1 = {A, B, D},V2 = {A, B', C}.GraphDiffreportsinserted = {C}andupdated = {B}; it has no removed-nodes field andDappears nowhere in it. The probe recomputesremoved = {D}from exactly the two seal mapsdiff()already materialises (versioned.rs:550-554) before discarding their difference.The gap is an API omission, not information the store lost. Seal gate exercised two-sided (removal ⇒
Staunen, self-compare ⇒Wisdom); unchangedAasserted absent from both sets, so "updated" cannot degenerate into "present".Consequence: historical snapshot comparison is the correctness oracle for the changed set. Native lance delta is an optional accelerator measured against this, never a replacement.
Baseline ruling for follow-up research
This PR closes the identity/diff archaeology only:
cycle_sink) is the canonical temporal persistence rail; its 512-byte witness and V1/V3NodeGuididentity survive the Lance 11 path measured here.VersionedGraph/ GraphBLAS snapshot) is an older projection with a locally scopednode_id:u32; this PR does not add a duplicate GUID column or invent an A↔B mapping.Runtime-topology non-claim
The
#[tokio::test]annotations in these probes and in the existingcycle_sinkinvariant suite are test-executor scaffolding for async Lance APIs only. They are not evidence that Tokio, ractor, task scheduling,spawn,await, acknowledgement, or executor timing belongs on the 64k deterministic substrate hot path.The source contract remains fire-and-forget producers with no acknowledgement. This PR makes no runtime-topology change and must not be cited later as authorizing an async scheduling boundary in cognition or sealing.
A separate persistence experiment may quarantine whatever async executor Lance requires behind a synchronous deterministic handoff. That question is out of scope here.
Persistence copy boundary left for the next experiment
Do not conflate temporal read-side zero-copy with the current writer boundary.
cycle_sink.rsexplicitly documents thatLanceCycleWritermaterializes frozen landings into Arrow builders, copying each artifact payload once, and thatscan_*copies bytes back out. #1209 does not repair or benchmark that seam.That leaves a clean next research question: compare the hand-rolled WAL and Lance 11 MemWAL only behind the deterministic fire-and-forget boundary, and independently test whether the seal can be composed from state already materialized by the substrate instead of forcing a full 64k × 512-byte pass.
Not landed, deliberately
The fleet also produced
test_c_cycle_payload_roundtrip.rs. It is not in this PR: D-TEMPORAL-1 already proves the stronger V1/V3 byte, address, restart and version result, and a second green test of the same claim adds review cost without adding a falsifier.Falsifiability
Every assertion here failed at least once before it passed, for a real reason. Two of those failures were bad assertions on my side (
local_key_v2was expected to separate leaf-varying keys; it must not) and are now pinned as the correct behaviour rather than deleted.Scope — what this does NOT prove
Byte and address fidelity of the store, and the semantics of its change sets. Not production reachability:
LanceCycleWriterstill has zero non-test callers, asD-MW-P2already records.Evidence provenance — local execution vs CI
These differ and the distinction matters:
canonical_witness_identity_probe(3 tests)test_e_old_diff_tripartite(1 test)cycle_sinkasync invariant suite (23 tests; Tokio is only the test executor)v3_mint_reachability_probe(2 tests)rust-test.ymlrunslance-graphas--no-run/--lib/--doc, so the twolance-graphintegration targets are compiled by CI but not executed there. Only the contract crate's integration tests run under--testsin CI. Nothing here should be read as GitHub Actions having re-run the storage probes.Gates
cargo fmtclean;cargo clippy --no-deps -- -D warningsclean on all three targets;append_only_gate.pyself-test 7/7 then GREEN on the real diff.Board hygiene
STATUS_BOARD.mdgains four rows underlance-convergence-staged-migration-v1(1850 → 1854; append-only post-check run each time).SUPERSESSION-INDEX.mdis regenerated in this PR. An earlier revision of this description claimed it would not need to be, reasoning that a STATUS_BOARD-only change could not move it. That was wrong and CI caught it:crates/is also an index input, and the new probe callspersist_cycle— a ruled symbol — moving its reference count from 10 to 11. Regenerated with the documented command and verified idempotent.🤖 Generated with Claude Code
https://claude.ai/code/session_012wrzeZAdwGYTCKoxamwQht
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