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🔍 Cursor Review — Consolidated panel
Triggered by @synap5e.
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Reviewers that did not contribute: claude-opus-4-8-thinking-max:adversarial (empty), gemini-3.1-pro:adversarial (empty), gpt-5.6-sol-max:adversarial (empty), kimi-k2.7-code:adversarial (empty), claude-opus-4-8-thinking-max:edge-case (empty), gemini-3.1-pro:edge-case (empty), gpt-5.6-sol-max:edge-case (empty), kimi-k2.7-code:edge-case (empty)
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drain_pending_verifications and drain_transition_queue ran every entry in one session, so an entry that wrote (marking a vanished file missing, say) left a transaction open while the next entry's file was stat'ed and hashed. Commit at the top of each entry instead, so the hash runs with no transaction open.
tick_watch_list seeded each settled file through seed_asset_specs in the caller's session, where the enrich phase still held drain_pending's writes open, and each seed ran in a deferred savepoint that reads before it writes. Collect the settled specs and hand them to insert_asset_specs, which stats and hashes before opening one write session. The seeder commits the pending verifications before ticking, so no transaction is open while the watch list stats or waits for the write lock.
_create_upload_record read the file for system metadata after the content claim had opened a write transaction. Callers now extract the metadata before opening their session (or, when reusing content, before claiming it) and pass it in. The claim's own stat re-check stays inside the transaction: that is what makes the claim sound.
If restoring the pre-upgrade backup raised, that exception replaced the upgrade's, and the backup's location was never logged. Log the upgrade error first, log where the pre-upgrade copy is kept if the restore or its cleanup fails, and re-raise the upgrade error either way.
…her failure The drains' per-entry commit only leaves no transaction open on a create_session() session. The restore log now covers a failed backup removal as well as a failed restore. The watch-list admission test patches insert_asset_specs, the seam tick_watch_list now calls.
observe_asset_specs treated every OSError as a vanished file, so a permission error or an I/O error on a file that still exists was reported only as "Skipping vanished asset during scan". A missing file is still handled as before; any other OSError is now also logged through _log_scan_error before the spec is skipped. The vanished-path test's fake now raises FileNotFoundError, the error a vanished file produces.
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| _log_scan_error("seed_observation", e) | ||
| observed[path] = None |
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Distinguish unreadable specs from vanished ones
When os.stat or snapshot_hash raises a non-FileNotFoundError such as PermissionError, this logs the real error but still stores None; seed_asset_specs then handles that value by warning Skipping vanished asset during scan. Each unreadable file therefore produces both the new diagnostic and a contradictory claim that the file vanished. Preserve the failure reason or make the downstream warning accurately cover both cases.
AGENTS.md reference: AGENTS.md:L368-L369
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Taken in #16489, stacked on this PR so this one stays as approved. observe_asset_specs logs "vanished" only for FileNotFoundError, and seed_asset_specs no longer warns a second time for a skipped spec. The unreadable-path test now asserts that the file is never reported as vanished.
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. 📝 WalkthroughWalkthroughThe changes add logging for seed-observation errors, batch settled watch-list specs for insertion, and adjust verification transaction boundaries. Ingestion paths now extract system metadata before record creation. Migration recovery logs upgrade and restoration failures while preserving the original upgrade exception. Priority: ⬇️ Low Merge Risk: 🔵 Low · up to This change shortens how long asset hashing holds the database lock. As a result, a file registered at the same moment it is being verified can make that verification step fail instead of retrying. No data is corrupted. The failure is narrow and recoverable, so the change is mergeable, with a small follow-up to retry affected entries. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Actionable comments posted: 2
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Inline comments:
In `@app/assets/scanner_changes.py`:
- Line 166: Update the per-entry commit flow at session.commit() to handle
SQLITE_BUSY_SNAPSHOT: roll back the failed transaction, reload the entry from
the database, and retry hashing and committing against the fresh row. Keep the
retry scoped to the affected entry.
In `@tests-unit/assets_test/services/test_upload_b.py`:
- Around line 1441-1444: Update the test’s cleanup around upload_from_temp_path
to retain the first upload result and remove its ref.file_path in the finally
block, alongside temp1 and temp2; skip that output path if the first upload did
not produce a result.
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app/assets/scanner.pyapp/assets/scanner_admission.pyapp/assets/scanner_changes.pyapp/assets/seeder.pyapp/assets/services/hash_mode_state.pyapp/assets/services/ingest.pyapp/database/db.pytests-unit/app_test/test_db_init_locking.pytests-unit/assets_test/services/test_admission_gate.pytests-unit/assets_test/services/test_detection_gate.pytests-unit/assets_test/services/test_from_hash.pytests-unit/assets_test/services/test_scanner_seed_resilience.pytests-unit/assets_test/services/test_transition_drain.pytests-unit/assets_test/services/test_upload_b.pytests-unit/seeder_test/test_seeder.py
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app/assets/scanner.pytests-unit/app_test/test_db_init_locking.pytests-unit/assets_test/services/test_upload_b.pytests-unit/assets_test/services/test_transition_drain.pytests-unit/assets_test/services/test_scanner_seed_resilience.pyapp/assets/scanner_changes.pyapp/assets/services/hash_mode_state.pytests-unit/seeder_test/test_seeder.pyapp/assets/services/ingest.pyapp/database/db.pyapp/assets/seeder.pytests-unit/assets_test/services/test_from_hash.pyapp/assets/scanner_admission.pytests-unit/assets_test/services/test_admission_gate.pytests-unit/assets_test/services/test_detection_gate.py
🔇 Additional comments (4)
app/assets/scanner.py (1)
423-427: LGTM!tests-unit/assets_test/services/test_scanner_seed_resilience.py (1)
85-85: LGTM!Also applies to: 118-142
app/database/db.py (1)
307-307: LGTM!Also applies to: 310-317
tests-unit/app_test/test_db_init_locking.py (1)
158-177: LGTM!
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TL;DR
Reviewer attention: Normal priority; review after #16480. This PR is stacked on #16480, and its diff only makes sense on top of that branch.
PR Justification: #16480 moved file reads out of the write transactions for scanning and output registration. The remaining asset write paths (the enrichment drains, watch-list admission and uploads) still stat, hash or read files while a transaction is open. This also carries the restore-error fix promised on #16480.
Stakes: Low to medium. Most of the exposure is in hashing mode, where the drains can hold the write lock while hashing a large file. The changes are small, but they move commit boundaries in the enrichment phase, and none of it has been measured on a real server.
Changes: Commit each drained entry before hashing the next, seed settled watch-list files through #16480's observe-then-write path, read upload metadata before the claim, and keep the upgrade error when restoring the backup also fails.
Stacked on #16480. Review that first; this PR's diff is against its branch.
Problem
#16480 moved filesystem work out of the write transactions for scanner seeding, reference sync and executed-output registration. Other asset write paths still stat, hash or read files while a SQLite transaction on the same connection is open. It also contains the fix promised on #16480: when a migration upgrade fails and restoring the pre-upgrade backup also fails, the restore's exception replaces the upgrade's, and the backup's location is never logged.
Cause
A statement trace (sqlite3 trace callback on every connection, plus
os.statandopenwrappers) against a file database on the #16480 head shows these paths reading files inside an open transaction:drain_pending_verifications(app/assets/scanner_changes.py) anddrain_transition_queue(app/assets/services/hash_mode_state.py) process every queued entry in one session. When an entry writes, e.g. marking a vanished file missing, the implicitBEGINstays open while the next entry's file is stat'ed and hashed.tick_watch_list(app/assets/scanner_admission.py) runs in that same session, so its stats and hashes also run inside the drain's open transaction. Each settled file is seeded in a deferredSAVEPOINTthat reads before it writes.create_from_hash(app/assets/services/ingest.py) and the reuse path ofupload_from_temp_pathread the file for system metadata after the content claim'sUPDATEhas opened the transaction.Change
tick_watch_list()no longer takes a session. It collects the settled specs and passes them toinsert_asset_specs, the path Take the SQLite write lock up front for asset scan and output-registration writes #16480 already converted: stat and hash first, then oneBEGIN IMMEDIATEwrite session._create_upload_recordtakessystem_metadataas an argument instead of reading the file. Callers extract it before opening their session. When reusing content, they extract after the lookup and before the claim. For the new-content upload path andregister_file_in_place, the trace already showed the read outside any transaction, so on those two paths this is only the signature change.observe_asset_specs(app/assets/scanner.py) logs the real error type through_log_scan_errorwhen a spec fails to stat or hash with anything other thanFileNotFoundError, then skips it as before. A missing file is still reported as vanished. This is the fix promised on Take the SQLite write lock up front for asset scan and output-registration writes #16480 for its "everyOSErroris logged as vanished" finding._migrate_and_bind(app/database/db.py) now logs the upgrade error first. It wraps the restore and the backup removal in atrythat logs where the pre-upgrade copy is kept, and re-raises the upgrade error either way.Deliberately left alone:
refresh_qualified_contentstill stats the file after the claimUPDATE. That re-check under the claim is what makes the claim sound.create_session(). In the trace, every transaction on those paths starts with a write statement, so there is no read-then-write upgrade forBEGIN IMMEDIATEto prevent. Switching would also merge the content insert and the record insert into one transaction, which is a behaviour change outside this PR.This is unmeasured on a real server. The evidence is statement traces and unit tests, not latency or lock-contention measurements.
Tests
New tests. Each one fails with its production change reverted, and each was checked by actually reverting:
test_detection_gate.py::test_drain_commits_each_entry_before_hashing_the_next:assert [True] == [False]when reverted.test_transition_drain.py::test_drain_commits_each_entry_before_hashing_the_next:assert [False, True] == [False, False]when reverted.test_seeder.py::test_enrich_phase_commits_pending_verifications_before_ticking_watch_list: without the seeder commit, the watch list ticks before the commit.test_admission_gate.py::test_settled_entries_are_seeded_in_one_write_session_batch: with the per-spec seeding restored,insert_asset_specsis called 0 times.test_from_hash.py::test_create_from_hash_reads_the_file_before_the_claim_transactionandtest_upload_b.py::test_reupload_reads_the_reused_file_before_the_claim_transaction:assert [True] == [False]against the oldingest.py.test_scanner_seed_resilience.py::test_seed_logs_the_real_error_for_an_unreadable_path: with the oldscanner.py, only the "vanished" line is logged, noterror_type=permission_denied.test_db_init_locking.py::test_failed_restore_does_not_mask_the_upgrade_error: with the old code,OSError: restore explodedpropagates instead of the upgrade'sRuntimeError.The statement-trace probe runs each site against a file database built by
init_db(). It flags any stat/open while a connection has a transaction open, countingBEGIN,BEGIN IMMEDIATE, or an outermostSAVEPOINTuntilCOMMIT/ROLLBACK/itsRELEASE. The probe has controls: I/O deliberately placed inside a legacy DML transaction, an outermost savepoint, andBEGIN IMMEDIATEis flagged for both stat and open, and a stat after a bareSELECTis not. On this branch it passes 31/31. On the #16480 head it fails the drains, the enrich-phase preamble,create_from_hashand the watch list's single-BEGIN IMMEDIATEcheck. Excerpt,drain_transition_queueon the #16480 head:and on this branch:
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