fix(platform-wallet-storage): durably apply swept transactions in the SQLite store - #4559
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe storage layer now processes sweep removals, tracks chainlock and sync watermarks, preserves sweep-related UTXO state, and removes finalized tombstones. The migration adds the required columns and partial index. Documentation and capability declarations describe the updated behavior. ChangesUTXO sweep finality
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The sweep persistence, tombstone lifecycle, migration, and capability changes have no substantiated merge-blocking risk. Sequence Diagram(s)sequenceDiagram
participant CoreStateApply
participant apply_sweep
participant core_sync_state
participant core_utxos
CoreStateApply->>core_sync_state: persist sync and chainlock watermarks
CoreStateApply->>apply_sweep: process swept loser transactions
apply_sweep->>core_utxos: release, repoint, or create placeholder claims
CoreStateApply->>core_utxos: collect finalized tombstones
core_utxos-->>CoreStateApply: remove finalized rows
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✅ Passed checks (4 passed)
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In `@packages/rs-platform-wallet-storage/SCHEMA.md`:
- Around line 384-393: Update SCHEMA.md to document all schema objects
introduced by V007__utxo_sweep_winner_height.rs: add
core_utxos.winner_mined_height to the CORE_UTXOS diagram and description, add
core_sync_state.chainlock_height to the CORE_SYNC_STATE diagram, and list
idx_core_utxos_unmaterialized(wallet_id, winner_mined_height) with its height IS
NULL predicate in the index section.
In `@packages/rs-platform-wallet-storage/src/sqlite/schema/core_state.rs`:
- Around line 675-676: The UPSERT_UTXO_SQL conflict-update logic must clear
materialised sweep claims when a reinstated UTXO is re-emitted through
new_utxos. Update the spent-state handling so released outpoints are no longer
preserved as spent solely because spent_in_txid is set, and ensure the
corresponding release path updates the materialised claim state so the coin
becomes available again.
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packages/rs-platform-wallet-storage/SCHEMA.mdpackages/rs-platform-wallet-storage/migrations/V007__utxo_sweep_winner_height.rspackages/rs-platform-wallet-storage/src/sqlite/persister.rspackages/rs-platform-wallet-storage/src/sqlite/schema/asset_locks.rspackages/rs-platform-wallet-storage/src/sqlite/schema/core_state.rspackages/rs-platform-wallet-storage/tests/sqlite_transaction_sweeps.rs
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… SQLite store Teaches the store the one subtractive part of a changeset. `apply_sweep` runs last in `apply`, batch by batch in emission order, so a later batch's decision to keep a coin spent survives an earlier batch's decision to free it — the order the wallet itself applied them in. Per swept transaction: the record row and every output it created go, its InstantSend lock row goes with it (nothing else ties that table to `core_transactions`), and a co-swept parent's outputs are removed even when the parent has no row of its own. Per released outpoint: the coin is freed unless a surviving stored record still claims it — asked as "does any unpruned row still claim this outpoint", upstream's own `retain_unclaimed` predicate, rather than the unanswerable "which transaction set this spent mark". The veto counts only network-final claimants: a bare mempool row can go stale forever, and letting one veto an authoritative release is the mirror image of the bug this fixes. Every input the release does NOT name keeps a durable claim, as a zero-value placeholder row when its funding output has never been seen, so a coin cannot come back unspent after a restart merely because the store never saw where it came from. `winner_mined_height` decides a placeholder's lifetime and never its existence. A block-context sweep stamps the winner's own height and the row is collectible once `min(chainlock, synced)` reaches it — upstream's `prune_finalized_observed_spends` boundary verbatim. An IS-locked winner that is not yet mined leaves the row UNSTAMPED and uncollectible: the lock alone settles the input under DIP-10, and no watermark can ever prove an unmined winner's funding delivered-or-never. V007 adds the stamp column; `spent_in_txid` needed no migration (V001 has it) and the new upsert valve is a no-op on every existing database, since `apply_sweep` is its only writer. The store declares `CORE_SWEEP_REMOVAL` and `DASHPAY_PAYMENTS`. Both are inert here — nothing emits a sweep until the producer lands, and the payments bit attests the overlay writer this crate already shipped. A sweep whose typed key disagrees with its stored record fails the round closed before anything is deleted: that row sits in the one gap where neither reader sees the other's evidence, and processing it would manufacture the double spend the veto exists to stop. Tests: 34 in `tests/sqlite_transaction_sweeps.rs`, all driving `core_state::apply` on hand-built changesets with no producer involved — release-versus-claim, co-swept twins, chained and repointed tombstones, collection boundaries, multi-wallet independence, corrupt-row refusals, and durability across a reopen. Known exposure, documented at the placeholder site and deferred by agreement: a swept loser's foreign inputs cannot be told from wallet-owned ones, so an unmined winner's placeholders are not collectible. rust-dashcore#968 tracks the upstream half.
… release Two review follow-ups. `SCHEMA.md` described `spent_in_txid` but not the three objects V007 creates, so the reference no longer matched the database: `core_utxos.winner_mined_height`, `core_sync_state.chainlock_height`, and the partial `idx_core_utxos_unmaterialized` covering exactly the unmaterialised rows. All three are now in the diagrams and the prose, including what the stamp decides (a placeholder's lifetime, never its existence) and why the funding upsert clears it. The second was raised as a missing release path for a materialised claim. The path exists — `apply` splits on `height IS NULL`, deleting an unmaterialised placeholder outright and freeing a materialised row in place — but nothing pinned that half: every other release test exercises the placeholder, so a release that silently skipped materialised rows would have left a live coin spent forever with nothing else able to free it, the collector being deliberately unable to take such a row. `a_release_frees_a_materialised_claim_in_place` closes that: seed a stamped tombstone, materialise it through the funding upsert, then have the winner itself swept with the coin released, and assert the row comes back unspent in place — keeping its funding data — and stays so across a restart.
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… even without its record
Review follow-ups: one real durability hole, one wasted scan, two
comments that pointed at nothing.
The lock delete sat AFTER the early return for a missing record row.
`instant_locks_for_non_final_records` merges independently of `records`,
so a lock can outlive its record — a fatal flush discarding a buffered
round is the documented way — and nothing ties the two tables together:
no foreign key, no trigger. The comment beside the delete already spelled
out the consequence ("the lock would outlive the transaction it describes
forever"); the delete now runs before the return, which costs nothing
since it is txid-keyed and idempotent.
`claimed_by_survivors` hashed every surviving record's input on every
sweep-carrying round, while its only consumer is the released-outpoint
filter — and the common sweep, a resend whose winner takes every input
its loser did, releases nothing. It is now built only when some batch
actually releases something, matching the laziness `stored_claims`
already had for the same reason.
A comment cited `:340` for the upsert valve, an absolute line number that
had already drifted into an unrelated doc block; it names
`execute_upsert_utxo`'s conflict clause now, as the surrounding comments
do.
And the asset-lock removal comment claimed `AssetLockChangeSet::merge`
guarantees no changeset carries an upsert and a tombstone for one
outpoint. That fold does not exist on this branch — it lands with the
producer — so the claim was unverifiable here. The comment now says what
this statement actually relies on: the `status != 'consumed'` predicate,
which holds whatever the fold does.
Also drops a `drop(delete_output_stmt)` that forced the identical DELETE
to be re-prepared per co-swept input.
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Review — #4559 fix(platform-wallet-storage): durably apply swept transactions in the SQLite store
Reviewed at b95a50d0c2 against the merged base (#4558 is in v4.2-dev, so the diff is this PR's own). Ran locally in a worktree:
cargo test -p platform-wallet-storage— all green, incl. the 35 intests/sqlite_transaction_sweeps.rs.cargo clippy -p platform-wallet-storage --all-targets— no warnings in this crate;cargo fmt --checkclean.- V007 is picked up by
refinery::embed_migrations!("./migrations")(directory glob, no registry to edit). DASHPAY_PAYMENTSis truthful:schema/dashpay.rsalready writesdashpay_payments_overlayandpersister.rs:1189applies it.- The
height IS NULL ⇒ tombstoneinvariant the collector relies on holds:Utxo.heightisu32andexecute_upsert_utxobinds it unconditionally, so nothing else has ever written a NULLheightfrom this crate.
Verdict: approve with two questions I'd like answered before merge (neither is a blocker on its own), plus a few doc nits.
What's good
- Releases are applied by outpoint outside
apply_sweep(core_state.rs:272), so a swept txid with no row cannot swallow the release set.a_release_applies_even_when_the_swept_txid_has_no_rowpins it. - Both readers fail closed on a key/blob disagreement before anything is deleted (
surviving_stored_input_claimsand the check at the top ofapply_sweep), and the tests verify the refused round left the row and the coin untouched, across a restart. - The veto is network-final only, and the trade (a stale mempool row cannot strand a coin; a live one after restart may transiently re-offer) is stated and tested from both sides.
- Batch order is honoured and the "later batch keeps a coin spent over an earlier release" case is tested, as are chained/repointed tombstones in both stamp directions and the no-chainlock collector no-op.
- Placeholder rows are deleted on release rather than flipped to
spent = 0, and the collector's first pass self-heals the legacy shape.
Questions
1. What releases a materialised claim whose winner is reorged out without ever being swept? (core_state.rs:675)
The spent_in_txid valve is needed for materialised rows too — derive_new_utxos re-emits a record's outputs on every re-observation (core_bridge.rs:888), so a funding tx confirming would otherwise clear a hold. But that leaves one shape with no exit: SweepBatch::winner_mined_height is documented as "arrival in a block", not a chainlocked one. If a non-chainlocked block carrying winner W triggers a block-context sweep, W is later reorged out, and the replacement chain never spends the coin, then upstream re-adds the coin via new_utxos — and the store keeps it spent = 1 forever: the valve holds, the collector never touches materialised rows, and nothing sweeps W (it need not be wallet-relevant, so it has no row to sweep). Is this excluded by the producer (sweep only on chainlock/IS-lock), or is it an accepted residue like the foreign-input one? If accepted, worth a sentence at the valve. If not, the valve could distinguish "materialising a placeholder" (core_utxos.height IS NULL) from "re-emitting a coin the store already has" — though that reopens the re-observation case above, so it's not free.
2. Same-round ordering between records and sweeps is lost, and the sweep always wins. (core_state.rs:147, changeset.rs:698)
CoreChangeSet::merge coalesces records newest-wins and appends sweeps; apply runs sweeps last. So a changeset that folds sweep(A) followed by a reinstating record(A) (plus its new_utxos) ends with A's row and outputs deleted, regardless of emission order. AssetLockChangeSet::merge explicitly cancels a folded sweep tombstone on reinstatement (the comment this PR adds at asset_locks.rs:85 says so); CoreChangeSet::merge has no such rule. a_record_reinstating_a_swept_txid_in_a_later_round_is_accepted_and_durable only covers separate rounds. If a same-round reinstatement can't happen upstream, fine — but then please pin "same-round sweep beats same-round record" with a test so the next person doesn't have to re-derive it; if it can, the fix belongs in merge (producer PR), not here.
Nits (non-blocking)
SCHEMA.md:93still saysheight "NULL if unconfirmed"forcore_utxos. That's now the opposite of the invariant the collector depends on (height IS NULLis exactly "unmaterialised sweep placeholder"; an unconfirmed real UTXO gets0). Suggest:"NULL only for an unmaterialised sweep placeholder".tests/sqlite_transaction_sweeps.rs:3and:121refer toCoreChangeSet::swept_transactions; the field issweeps.V007…rs:39-47narrates branch history (formerV006__utxo_tombstone_stamp,held_since_height, the renumbering). Per #4594's direction, keep the decision ("version numbers, like capability bits, are append-only") and drop the history.- The long comment above the capability union in
persister.rs:829-845describesapply_sweepinternals at the declaration site; it would read better as a one-liner pointing atapply_sweep, which already carries the full doc. - Future:
surviving_stored_input_claimsdecodes every record of the wallet per round that has a surviving release. The cost is documented and only paid on a real release; if it ever shows up, a(wallet_id, input_outpoint) → txidside table written alongsidecore_transactionswould make it O(released).
Risk
Low–medium. The change is inert until the producer lands (apply fast-returns on empty sweeps), V007 is additive, and the new spent = CASE … valve only changes behaviour for rows whose spent_in_txid is set, which no shipped writer has ever done. The residual exposure is question 1 above, and it is bounded to a reorg of a non-chainlocked winner block.
… shape, not on its link Review follow-ups on the sweep writer. Four funds-correctness holes, all closing on one rule: what makes a held coin durable is the row's shape — never-materialised (`height IS NULL`) and spent — not `spent_in_txid`. The valve in `UPSERT_UTXO_SQL` held `spent` for ANY row with a link. That locked a materialised coin out forever when its in-block winner was reorged out and never swept again: nothing but a release clears a materialised row, and the reorged winner never sweeps. A materialised row is the wallet's own coin — it knows the funding, and any network-final spender of a coin it knows is wallet-relevant (BIP158 matches the input's prevout script), so the wallet's own scan re-discovers the spend and its view of `spent` is authoritative. The valve now holds only a never-materialised held row; a re-delivered materialised coin follows the wallet, link cleared with it. `derive_new_utxos` is driven only by inserted records, never by updates, so a known funding transaction confirming cannot clear a hold — only a rescan re-inserting a forgotten record does, which is exactly the case where the wallet's view wins. The link was not a durable key even on a placeholder: the V001 trigger `setnull_core_utxos_on_tx_delete` nulls it whenever the named winner's row goes — including when that winner is itself swept later and the placeholder is not one of its inputs, so the input loop never re-points it. The shape-keyed valve makes that harmless: the hold and its stamp survive the link going, and the collector, which never read the link, still collects at the stamp. A `spent_utxos` delivery onto a placeholder used to `UPDATE spent = 1` in place, leaving `height` NULL and the stamp intact — the collector would later delete the only durable record of the spend, and a rescan re-delivery would land the coin unspent. Only a materialised row takes the fast path now; a placeholder goes through the full upsert and materialises. The by-outpoint release pass could resurrect an output of a transaction swept in the same round: with both the parent's and the child's records lost, nothing in the loser loop removed the parent's materialised output, and releasing it in place handed back a spendable coin from a transaction that can never confirm. Such an outpoint is deleted whatever its shape. Also: the collector's first pass is gone — the `height IS NULL AND spent = 0` shape is created transiently by the loser loop and always deleted by the release pass in the same transaction, so there was nothing left to self-heal; the remaining DELETE is prepared cached. A pin for the one same-round shape this store decides on its own (a record and its sweep in one round end with the record gone; the reinstating fold is retracted in `CoreChangeSet::merge` by the producer). Doc nits from review: `SCHEMA.md` `height` semantics, the `sweeps` field name in the test-file docs, V007's branch history replaced by the decision, the capability comment in `persister.rs` reduced to a pointer. Tests: five new cases in `sqlite_transaction_sweeps.rs`, four of them red on the pre-fix writer (the fifth pins that the collector keys on the stamp, not the link). The legacy-placeholder collector test is removed with the pass it covered.
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@llbartekll thanks — both questions were real, and both are answered in code rather than in prose: 1. Materialised claim whose winner is reorged out. Not accepted residue — fixed in On the re-observation worry: 2. Same-round record + sweep. It cannot be decided here: the store cannot tell "arrived, then lost" from "lost, then reinstated", so it runs sweeps last and the sweep wins — correct for the first, common shape. The second shape is retracted in Also in the follow-ups (same doctrine as the fix for 1): the Nits: all four done. The One thing to know: this PR sat on |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
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- Misses 47866 49308 +1442
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Re-reviewed 0e4685fc82 + 27fbd476b1 on top of b95a50d0c2. Both questions are answered in code, and the answers are better than the ones I had in mind.
Q1 (reorged-out winner) — keying the valve on the row's shape (height IS NULL AND spent) instead of on spent_in_txid is the right split. I confirmed the two facts it rests on: derive_new_utxos is only driven from inserted records (core_bridge.rs:843, :888), so a known funding tx confirming cannot clear a hold; and setnull_core_utxos_on_tx_delete does null the link whenever the named winner's row goes, so the link was never a durable key even on a placeholder. a_materialised_coin_the_wallet_re_delivers_unspent_is_released_from_its_hold and the two nulled-link tests pin it.
Q2 (same-round record + sweep) — agreed that the store cannot distinguish the two shapes; pinning "sweep wins" here and retracting the swept txid in CoreChangeSet::merge in #4560 is the right place for each half.
The follow-ups are all sound: the spent_utxos fast path taking only materialised rows (a delivery must materialise, or the collector deletes the only durable record of the spend); the release pass deleting a same-round swept output rather than freeing it (closes a phantom-coin hole when both parent and child records are lost); the IS-lock delete ahead of the missing-record early return; and dropping the collector's first pass — I traced the only producer of height IS NULL AND spent = 0 (the loser loop's transient free on a placeholder) and it always implies a non-empty released, so the release pass deletes it in the same transaction.
Verified locally on 27fbd476b1: cargo test -p platform-wallet-storage green (40/40 in sqlite_transaction_sweeps.rs), clippy clean for this crate, fmt clean. All four nits done.
One non-blocking note for later: a placeholder materialised through spent_utxos lands with height = 0, because derive_spent_utxos synthesises the Utxo (core_bridge.rs:1355) — the test uses make_utxo at height 10, so it reads slightly more optimistic than production. Harmless (a spent row, never surfaced as unspent, and the schema doc already says "0 if unconfirmed"), just worth knowing when reading that row later.
Approving.
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Issue being fixed or feature implemented
The SQLite store has no way to act on the one subtractive part of a changeset. Without it, a transaction the wallet dropped in memory stays on disk, replays at the next
load(), and hands back coins the network already consumed.Still fully inert: nothing emits a sweep until the producer lands (#4406's next PR), and
applyfast-returns on an emptysweeps.What was done?
apply_sweepruns last inapply, batch by batch in emission order, so a later batch's decision to keep a coin spent survives an earlier batch's decision to free it — the order the wallet itself applied them in.Per swept transaction: the record row and every output it created go; its InstantSend lock row goes with it (nothing else ties
core_instant_lockstocore_transactions); a co-swept parent's outputs are removed even when the parent has no row of its own.Per released outpoint: the coin is freed unless a surviving stored record still claims it. The question asked is "does any unpruned row still claim this outpoint" — upstream's own
retain_unclaimedpredicate — rather than the unanswerable "which transaction set this spent mark", which SQLite does not record. The veto counts only network-final claimants: a bare mempool row can go stale forever, and letting one veto an authoritative release is the mirror image of the bug this fixes.Every input the release does not name keeps a durable claim, as a zero-value placeholder row when its funding output has never been seen — so a coin cannot come back unspent after a restart merely because the store never saw where it came from.
winner_mined_heightdecides a placeholder's lifetime, never its existence. A block-context sweep stamps the winner's own height and the row is collectible oncemin(chainlock, synced)reaches it — upstream'sprune_finalized_observed_spendsboundary verbatim. An IS-locked winner that is not yet mined leaves the row UNSTAMPED and uncollectible: under DIP-10 the lock alone settles the input, and no watermark can ever prove an unmined winner's funding delivered-or-never.V007adds the stamp column.spent_in_txidneeded no migration (V001 has it) and the new upsert valve is a no-op on every existing database, sinceapply_sweepis its only writer.The store declares
CORE_SWEEP_REMOVALandDASHPAY_PAYMENTS. Both are inert here — the sweep bit gates nothing until the producer lands, and the payments bit attests the overlay writer this crate already ships.A sweep whose typed key disagrees with its stored record fails the round closed before anything is deleted: that row sits in the one gap where neither reader sees the other's evidence, and processing it would manufacture the double spend the veto exists to stop.
How Has This Been Tested?
cargo test -p platform-wallet-storage— 254 tests pass across the crate.tests/sqlite_transaction_sweeps.rsadds 34, all drivingcore_state::applyon hand-built changesets with no producer involved: release-versus-claim, co-swept twins, chained and repointed tombstones, collection boundaries (stamped, unstamped, and without a persisted chainlock), multi-wallet independence, corrupt-row refusals, and durability across a reopen.Breaking Changes
None. V007 is additive and every existing database migrates unchanged.
Known exposure, deferred by prior agreement: a swept loser's foreign inputs cannot be told from wallet-owned ones, so an unmined winner's placeholders are not collectible. Documented at the placeholder site;
rust-dashcore#968tracks the upstream half. Bounded storage residue, no funds-correctness consequence.Checklist:
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