wikideck/docs/canonical-indexes.md

M2 increment — canonical indexes and recoverable market observation

Status: implemented local infrastructure, not full M2 acceptance or production authorization. Evidence date: 2026-10-21. Related: production plan, custodial design.

Delivered

• Canonical index stores current NFT ownership/sequence, canonical mint/block identity and transaction inclusion in SQLite. Owner/mint ordering and transaction indexes replace whole-chain scans for deck, NFT and marketplace queries.
• Ledger persistence commits accepted blocks, pending transactions, index connect/disconnect undo and canonical events in one SQLite transaction. A losing side branch or mempool submission does not create a canonical event. Disconnects run tip-first; connects run ancestor-first. No await separates the database commit from updating the in-memory tip.
• Events contain sequence, connect/disconnect type, block identity/height/parent, transaction IDs and a hash chained to the previous event. An independently generated local stream ID binds the history; it is not consensus data or a public proof of honest observation. Pages contain at most 64 events and no article payloads. Financial/chain history is not silently pruned.
• On first open, original blocks are replayed and independently proof/state validated before additive local index backfill. Later opens compare indexed block identity, ownership, transaction inclusion and event continuity/anchors to that validated chain. Inconsistent state fails closed; existing consensus version, genesis, signatures and free-transfer/trade rules are unchanged.
• Market reconciliation uses indexed current delivery/ownership queries and a persisted (stream ID, sequence, anchor) checkpoint. Every observed disconnect of a previously completed order causes a durable review hold, even if delivery reappeared before polling. Review is never automatically repaid. Hold updates and checkpoint advancement commit together in the market database.
• Order and listing review now uses stable-ID keyset batches capped at 128 rows each. A strict, durable job record stores stage, continuation ID, observed time, chain tip/revision, and the bounded canonical event page. Each batch commits row effects and its continuation atomically; the canonical event cursor advances only after both tables finish. A chain tip/revision change during a multi-batch scan rewinds the job and captures a fresh event page, preventing a mixed-view scan from being marked caught up. Completion checks the current event head so events appended during the scan remain behind the write fence.
• While any job/event backlog exists, ordinary market mutations and time-dependent payout/expiry decisions stop; diagnostic/read access remains available. Subsequent requests advance bounded work, and the HTTP lifecycle has an unref'd 250ms poller that drives catch-up independently of user page loads. The poller is not a separately isolated worker: SQLite work is synchronous on the server event loop. There is no claim of instant catch-up, a throughput SLO, or horizontal-worker safety.
• Reconciliation restart, mid-job event append/reorg fencing, disconnect review, and injected SQLite batch/cursor failures are tested. A failed batch leaves both order effects and durable keyset progress unchanged; restart resumes committed work. Restore mismatch (different stream, different history anchor or a cursor ahead of the restored ledger) is refused rather than resetting the cursor. Restore the matching stopped-node ledger/market backup; any alternative recovery requires reviewed evidence, not deleting a checkpoint.
• Restore mismatch (different stream, different history anchor or a cursor ahead of the restored ledger) is refused rather than resetting the cursor. Restore the matching stopped-node ledger/market backup; any alternative recovery requires reviewed evidence, not deleting a checkpoint.
• HTTP NFT lookup and custody card checks use the same index. Wallet deck pagination accepts an optional tip query; stale tips return 409. Existing callers without tip remain compatible. There is no new public event/admin endpoint, no payment observer and no NFT-lock signer.

Tests and measurements

The final Docker test-target build passed TypeScript/Vite compilation. All 174 offline tests passed, zero failures/skips, including native RandomX multi-process HTTP/peer/restart and backup rehearsal. The focused market suite passed 23 tests; the disposable PostgreSQL suite passed 31 tests. New failure evidence includes:

• indexed ownership/sequence versus full replay for transfers, multi-card trades and forks;
• append/disconnect/reconnect ordering, side-branch/mempool exclusion, bounded defensive-copy pages and durable restart;
• injected event-write failure rolling back blocks, indexes and mempool together;
• additive migration of a prior-schema copy, refusing corrupt ownership and event records;
• production market adapter exercised with full snapshots forbidden;
• multi-page catch-up and persisted restart checkpoint;
• 128-row order/listing keyset progress, restart continuation, and a new canonical event arriving during an in-flight job;
• chain revision change fencing that resets continuation and refreshes the event page before the scan continues;
• injected batch-write failure rolling back order effects and keyset progress, plus cursor-write failure rolling back checkpoint advancement while preserving committed review holds;
• numeric cursor reuse with a different historical hash rejected;
• real HTTP NFT results and stale-tip deck pagination.

Benchmark script, available as npm run benchmark:index -- 10000, creates/removes its own temporary SQL database. Input is bounded to 1–100,000 synthetic blocks; these are not valid mined blocks and are never submitted to a ledger/peer. It measures only derived index behavior, not PoW, network throughput or operating capacity.

Observed in the development Docker environment:

Metric	Result
Fixture	10,000 NFTs/blocks, 9,998 transfers, 16 owner identities
SQL fixture build (single transaction)	5,096 ms
1,000 query groups (NFT + 24-item owner page + optional transaction lookup), median / p95	0.619 / 1.167 ms
Read all events, maximum 64 per page	157 pages, 54.5 ms total
Verify derived indexes and anchored history	524 ms
Database plus WAL before close	76,856,784 bytes

These numbers are a reproducible baseline, not acceptance SLOs: host CPU/storage and production concurrency were not selected, outputs include synthetic article payloads, warm caches apply, one transaction amortizes insertion fsync, and real validation/startup/HTTP/market workloads are excluded. They do not establish a supported production envelope.

The synthetic market-journal harness benchmark, available as npm run benchmark:market -- 10000, separately measures bounded reconciliation of terminal order/listing records in its own temporary SQLite directory. On the same development Docker environment, 10,000 orders plus 10,000 listings completed in 157 reconciliation passes in 772 ms (about 25,903 records/s), with pass-latency p50/p95/max of 4.57/9.13/20.04 ms and a 7,180,288-byte SQLite file. This dataset intentionally avoids active-order delivery and listing validation branches; it measures local keyset/SQLite overhead only. It is not a target-hardware result or throughput/SLO claim and excludes concurrent HTTP traffic, event-loop interference from other work, PostgreSQL, chain validation and adversarial workloads.

Remaining gates

M2 still needs target-hardware/data/SLO decisions, populated long-journal/large-event benchmarks, bounded worker/event-loop latency under load, production financial database/schema and measured recovery/retention/storage growth. The new scheduler bounds work per pass, but does not yet provide queue isolation, multi-worker coordination, or a demonstrated production throughput envelope. Ledger PoW replay and DAG state memory still scale with retained history; indexed queries do not solve those costs. Startup validation checks undo-record counts but not every possible future undo mutation against a second reconstructed undo model; comprehensive corruption/fuzz coverage and independent review remain required.

Custodial reservations still stop at awaiting-lock. This increment does not consume ordinary transfers as custodial settlement evidence: doing that would bypass the reviewed sale-lock/cancel protocol. Real Monero deposit/withdrawal integration, production treasury keys, host attestations and a reviewed versioned NFT lock/completion/cancellation specification remain blocked. No real funds, credentials, external processor or genesis change were used.