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(Claude) Commit a project's cache refresh in one transaction - #390
A project's cache refresh now commits as one transaction, or not at all. While it parses, each file's entry rows go to a private SQLite spool file beside the cache (<cache>.spool-<pid>-<n>, refresh_spool.py: journal in memory, nothing synced, this process's own), with no shared lock held and the serialising where it was; the session rows, project aggregates and cross-session sidecar derived from them are deferred; and one write transaction at the end of CacheManager.atomic_refresh() attaches the spool, copies each file's rows in with INSERT … SELECT (no Python per row under the lock), runs the deferred writes, and commits. Both refresh paths of ensure_fresh_cache_detailed run inside that scope; a declined incremental attempt falls through to the full load in the same scope, which finds the attempt's parsed files in the spool, so a decline costs no second parse.
What that gives:
A refresh that stops anywhere (a lock-out, Ctrl+C, a kill, a full disk) leaves the cache exactly as it was and the spool removed; the next run, or the pass's in-pass retry, redoes it. Nothing is ever recorded as current over derived rows that predate it.
A reader on another connection sees the whole refresh or none of it.
Two refreshes of one project overlapping (a TUI build or a single-project run beside a serve --watch tick, or a pass whose lock degraded) commit two self-consistent snapshots: the later wins, and if it parsed older files its cached_files rows say so and the next run repairs it. That was the known limit of (Claude) Survive cache lock contention, redo interrupted refreshes, exit non-zero on lost projects #365's flag.
A sidecar write that fails at the merge for a reason other than contention rolls back to a savepoint and drops the sidecar's marker, as the direct write did; contention fails the whole merge, to be redone.
A statement left active over the overlay when a scope ends (a cursor the body did not exhaust, kept alive by an exception's traceback) makes DETACH fail; the scope then records the attachment and the next scope on that connection, or the connection's close, releases it, so neither a committed merge reads as a failure nor the body's own exception is replaced. The release checks PRAGMA database_list before detaching; with the record keyed on the connection object and dropped at every close, that check is unreachable belt-and-braces, kept on purpose.
The overlay. The incremental refresh reads back the rows it has just written (file states, uuid owners, request ids, the closure's entries). Inside a scope, two TEMP views named cached_files and messages shadow the tables for every unqualified read on the scope's connection: each is the table minus the rows the spooled files replace, UNION ALL the spool's rows, built from the tables' own column lists; a new file reads under a provisional id and a spooled tail after the file's rows. No read helper changes, the cache's side keeps its indexes and the spool carries its own (query plans checked by a test), and a write through the shadow fails, which is the right tripwire.
The flag retired. Migration 015's refresh_pending marked a refresh that had written entry rows but not yet the derived rows, so the next run would redo it in full. There is no such state to mark now, so the flag goes with its rules: every entry write setting it, get_modified_files reporting every file while set, the incremental path declining while set, the date-filter and Codex special cases, and the aggregates write clearing it last. Migration 016 drops the column and keeps 015's one-time heal: a project the flag still marks (015 marked every project of a cache it upgraded, since nothing else can tell) gets its message total zeroed, which the next run reads as a cache to refresh in full, served from the cached entries since no file is modified. 015 never shipped in a release, so every cache in the wild runs 015 and 016 back to back on upgrade. A hierarchy pass plans work for a populated project whose cached total is zero, in the unfiltered rule and in the date-window rule of #389 alike, so the heal reaches --combined no runs and a user who only ever runs windowed passes. ALTER TABLE … DROP COLUMN needs SQLite 3.35 (2021), so the cache now requires it: on an older SQLite, convert, serve and watch exit 1 with a message naming the version found and pointing to a newer Python or --no-cache (test/test_cli_sqlite_requirement.py). Every interpreter on the CI matrix bundles a newer one.
Orphan spools. A refresh removes its spool when it ends, whichever way; only a process killed mid-parse leaves one. A pass removes the spools of dead processes before it starts, under its lock (pid liveness: signal 0 on POSIX, OpenProcess on Windows).
Measured, cold refresh of the largest project of a frozen 32-project archive copy (863 MB on disk with agent files, 34 trunk files, 366 MB cache), refresh only, fresh cache, a driver that times every write_transaction and samples the WAL and spool sizes at 50 ms; four arms interleaved, main then this branch, twice:
arm
wall s
write txns
lock hold max s
hold sum s
WAL peak MB
spool peak MB
main (1)
38.0
267
2.28
10.8
111.6
–
branch (1)
54.3
2
12.34
12.35
368.4
332.5
main (2)
39.6
267
2.33
11.4
113.7
–
branch (2)
41.2
2
8.20
8.20
368.5
332.4
(The first branch arm ran while something else loaded the box; the second is the clean one.)
The known trade, stated plainly. On a cold refresh of a large project the branch holds the write lock once for 8–12 s where main held it 267 times for the same total (2.3 s at most), and the WAL peaks at the whole project's rows (368 MB against 112 MB) because nothing checkpoints inside a transaction; the end-of-pass checkpoint truncates it. For the pool's siblings that is the same wait in one piece; for a foreign process with the 30 s cache timeout one such hold fits, but a cold pass merging several large projects at once stacks them. Daily runs merge small deltas and are unaffected. Wall time is within 2 s on the clean pair: the spool is written once and read back.
Not changed: the render records (update_html_cache, update_page_cache), which are self-validating through the staleness check; the search catch-up; the pass lock; the Codex wholesale path, which keeps its direct writes (it re-parses every rollout each run and heals through is_transcript_stale).
Tests:test/test_cache_atomic_refresh.py (26: an interrupted refresh leaves every table byte-identical on either path, one BEGIN per refresh and invisible to another connection until it commits, row-for-row equality with the direct writes, the spooled-tail row check and its fallback, the sidecar savepoint, reads inside a scope seeing the spooled rows, the overlay's query plans, two overlapping refreshes leaving a repairable cache, a statement left active over the overlay, a leftover spool record not outliving its connection, migration 016's heal through a pass with and without the combined output, unfiltered and date-windowed); test/test_refresh_spool.py (3); the five lock-out cases kept in test/test_cache_interrupted_refresh.py (renamed from test_cache_refresh_pending.py); the sqlite3.connect census classifies the spool's connection. Docs: the cache bullet in CONTRIBUTING.md, dev-docs/application_model.md § 2.3 and the migrations list.
Cache refreshes now commit project data as a consistent whole. If a refresh fails, the existing cache remains intact and the work is retried on a later run.
Overlapping refreshes preserve a complete project snapshot, with later runs able to repair stale cached data.
Projects with cached messages but a zero message total are now recognized as needing refresh.
Cache refreshes now stage parsed entries in a per-process spool and merge them with derived cache writes in one transaction. The change removes refresh_pending, adds migration and refresh planning behavior, and includes tests for interrupted and overlapping refreshes.
Changes: Atomic cache refresh
Layer / File(s)
Summary
Spool staging and lifecycle claude_code_log/refresh_spool.py, claude_code_log/cache.py, claude_code_log/converter.py, test/test_refresh_spool.py, test/test_cache_sqlite_integrity.py
A per-process SQLite spool stores parsed file records and rows. The cache pass removes orphaned spools, with tests covering spool naming, cleanup, and connection setup.
CacheManager.atomic_refresh() stages entry writes and defers session, aggregate, and sidecar writes until merge. Tests cover rollback, append validation, spooled reads, and overlapping refreshes. The refresh_pending field and checks are removed.
The converter runs refresh paths within the atomic scope and schedules projects with zero cached messages. Migration 016 drops refresh_pending and zeroes totals for projects marked by it. Documentation and tests describe the updated refresh and recovery behavior.
daaain/claude-code-log#384: Both PRs change date-filtered refresh behavior; this PR adds atomic commits and schedules zero-total projects for refresh.
daaain/claude-code-log#377: Both PRs address overlapping cache passes; this PR also sweeps orphan spools while holding the pass lock.
Suggested reviewers:daaain
Merge Risk: Low · previous review 7c89f
The atomic cache refresh looks sound, but cache upgrades will fail on systems whose SQLite is older than 3.35, and those runs will silently proceed without a cache. The overlapping-refresh test may also pass without actually exercising true interleaving. Both are bounded and can be addressed with small follow-ups.
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Docstring coverage is 75.68% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
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[#374] Both refresh paths spool entries without the shared write lock and merge them with deferred session, aggregate, and sidecar writes in one transaction. The merge checks appended row counts. Migr…
Out of Scope Changes check
[#374] The overlay, spool cleanup, migration heal, planning changes, tests, and documentation support atomic refreshes and safe upgrades. The summary shows no unrelated changes.
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The title clearly describes the main change: committing each project's cache refresh in one transaction.
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[#374] Both refresh paths spool entries without the shared write lock and merge them with deferred session, aggregate, and sidecar writes in one transaction. The merge checks appended row counts. Migration 016 removes refresh_pending; related date-filter and Codex rules are removed. The migration heal preserves upgrade safety. Tests cover interruptions, overlapping refreshes, merge behavior, and recovery. Render records remain unchanged.
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Check that refresh B commits before refresh A continues.
B reuses A's leased connection, where spool is already attached. B can fail on the duplicate attachment, while the later pass repairs the cache and satisfies the final assertions.
Run B on a separate thread or process with its own connection. Assert that B commits and that A's pass reports no failed projects before the repair pass.
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Review comment at @test/test_cache_atomic_refresh.py around lines 700 - 711:
Update the interleave hook in the atomic-refresh test so refresh B runs
independently with its own CacheManager connection and completes before refresh
A continues. Verify B committed and A’s initial _pass reports no failed projects
before any repair pass; preserve the existing positive control that B runs
during A.
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Prompt to fix all issues
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at @claude_code_log/migrations/016_drop_refresh_pending.sql:
- Around line 18-22: Update migration 016 to avoid relying on SQLite 3.35-only
DROP COLUMN, preserving the refresh-pending heal and all existing foreign keys
while removing the column; alternatively, explicitly enforce and clearly report
the SQLite 3.35-or-later requirement so cache initialization cannot repeatedly
fail without explanation.
---
Nitpick comments:
Review comments at @test/test_cache_atomic_refresh.py:
- Around line 700-711: Update the interleave hook in the atomic-refresh test so
refresh B runs independently with its own CacheManager connection and completes
before refresh A continues. Verify B committed and A’s initial _pass reports no
failed projects before any repair pass; preserve the existing positive control
that B runs during A.
---
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(Claude) On the review's trivial comment about test_cache_atomic_refresh.py (lines 700–711, refresh B sharing A's connection): you were right. On the earlier head, B failed with "database spool is already in use", and the later repair pass hid it.
B now runs on its own CacheManager, on its own thread, while A holds the pass's lease.
The test asserts that B committed (its rows are there, no errors).
One deviation from the suggestion: A is now a plain ensure_fresh_cache rather than a whole pass, so the test asserts that A's refresh ran instead of "A's pass reports no failed projects". The docstring says why: the render of a file that grows between refresh and render has a gap of its own, which will be fixed separately.
A cache refresh writes each transcript file's rows in a transaction of
its own, then the session rows, the project aggregates and the
cross-session sidecar derived from them. A refresh that stops between
two of those (a lock-out, a kill, a full disk) leaves files recorded as
current over derived rows that predate them, which is what the
refresh_pending flag (migration 015) has been covering since #365, with
a known limit when two refreshes of one project overlap (#374).
This adds the mechanism that makes a refresh one transaction, without
holding the write lock during the parse. Inside a new
CacheManager.atomic_refresh() scope, save_cached_entries and
extend_cached_entries serialise as before but write to a private spool
file beside the cache (refresh_spool.py: journal and sync off, this
process's own), taking no shared lock; the derived writes are deferred.
On a clean exit, one write transaction ATTACHes the spool, copies each
file's rows in with INSERT ... SELECT (no Python per row inside the
lock), runs the deferred writes in the order they were requested, and
commits. On an exception nothing was written to the cache, and the
spool is removed either way. A tail spooled by extend_cached_entries
has its row check run at the merge, under the lock; a refusal there
rewrites the file whole from the parse, as the direct path's refused
append falls back to a full save. A deferred sidecar write runs in a
savepoint: a failure that is not contention drops the sidecar's marker
and lets the rest commit, as abandon_session_sidecar does for a direct
write; contention fails the whole merge.
Outside a scope every write lands at once, as before: the two entry
writers share their SQL with the merge through module constants, and
the four derived writers run the same bodies now or later. Nothing
opens the scope yet; the refresh paths move onto it next.
Tests drive the scope with a refresh's writes and read the cache back
through plain SQLite: an interrupted refresh leaves every table
byte-identical and no spool behind; a completed one is one BEGIN (seen
through a trace callback), invisible to another connection until it
commits, and row for row what the direct writes produce; a spooled tail
whose rows moved underneath is rewritten whole; a sidecar SQLite
refuses is dropped with the rest committed; a sidecar locked out at the
merge rolls everything back; a nested scope joins the outer one. The
connection census classifies the spool's connect site.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
ensure_fresh_cache_detailed's full path (the load of every file plus
the session rows, sidecar and aggregates derived from them) now runs
inside CacheManager.atomic_refresh(): the per-file entry writes of the
load go to the spool, the derived writes are deferred, and the scope's
end commits all of it at once. A refresh locked out, killed or failed
at any of its writes leaves the cache as it was, with no file recorded
as current, instead of entry rows ahead of their derived rows for the
refresh_pending flag to carry to the next run. The incremental path
stays outside the scope for now: it reads back the rows it writes
during the refresh, and moves in once those reads see the spool.
abandon_session_sidecar defers inside a scope like the write it
abandons, so a refresh that then fails drops nothing either.
Test: a pass whose full refresh is locked out at the second file's
entry write, at the session-row write or at the sidecar write reports
the project failed and leaves every table byte-identical, with no
spool behind; the next pass redoes the whole of it. Red before the
wiring (the failed pass recorded the first file and set the flag).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…erlay
The incremental refresh reads back the rows it has just written: the
modified files' states, the owners of their uuids, their request ids,
and the closure's entries when no entry store serves them. Inside an
atomic_refresh scope those rows are in the spool, so the scope now
overlays it on the cache: two TEMP views named cached_files and
messages shadow the tables for every unqualified read on the scope's
connection, each the table minus the rows the spooled files replace,
UNION ALL the spool's rows. A spooled file new to the cache reads
under a provisional negative id until the merge gives it a real one; a
spooled tail's rows read after the file's, so file order holds. The
views are built from the tables' own column lists, so SELECT * readers
see the same shape, and none of the read helpers change. A write
through the shadow fails loudly, which is right: inside a scope the
entry rows go to the spool and nothing else may write these tables.
The spool carries the indexes those lookups use, and a test checks the
plans: the cache's arm keeps its indexes, the spool's arm uses its
own. The views are dropped before the merge, which writes the tables.
With that, ensure_fresh_cache_detailed opens the scope around both
paths. A decline of the incremental refresh falls through to the full
load in the same scope, which finds the attempt's parsed files current
in the spool and loads them from it: a decline costs no second parse.
The date-filtered pending-refresh test produced its pending project
through a locked-out run; nothing in a run leaves the flag set any
more, so it sets the flag directly, as migration 015 leaves every
project it upgrades.
Tests: reads inside a scope see the spooled rows (file states, uuid
owners, the session-file map, is_file_cached and load_cached_entries,
a new file and an appended one), and the same after the merge with
real ids; the overlay's query plans; the incremental path locked out
at the second file's entry write, at the session-row write or at the
sidecar merge reports the project failed and leaves every table
byte-identical, and the next pass lands everything; and two refreshes
of one project overlapping (the second commits while the first is
between its entry rows and its derived rows) leave a cache the next
pass repairs, where before the first refresh's session row landed over
the second's newer entry rows and the project read current with a
stale count. All red before the overlay.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The spool ran with journal_mode OFF, which leaves ROLLBACK undefined:
a file whose rows fail part-way past the page cache corrupted the
spool, where RefreshSpool.add promises to roll that file back. No
caller catches inside a scope today, so a failed add always discarded
the spool, but the promise was false. journal_mode MEMORY keeps it:
no journal file, nothing synced, and ROLLBACK defined. A test with a
small page cache pins it.
Two failures that were safe but misleading: a transaction left open
on the scope's connection (a write that bypassed write_transaction)
made ATTACH fail with its own message, and a sidecar write failing
with an error that aborted the whole merge transaction (a full disk,
an I/O error) made the savepoint rollback fail on a missing savepoint,
replacing the real cause. Both now report what happened.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Migration 015's flag marked a refresh that had written entry rows but
not yet the derived rows, so the next run would redo it in full. With
a refresh committing as one transaction there is no such state to
mark: a refresh that stops leaves the cache as it was. The flag went
with its rules (every entry write setting it, get_modified_files
reporting every file while set, the incremental path declining while
set, the aggregates write clearing it last) and its one known limit,
two processes refreshing one project clearing each other's.
Migration 016 drops the column and keeps 015's heal: a project the
flag still marks (a cache upgraded through 015, which marked every
project it found) gets its message total zeroed, which the next run
reads as a cache to refresh in full, served from the cached entries
since no file is modified. 015 never shipped in a release, so every
cache in the wild runs 015 and 016 back to back on upgrade. DROP
COLUMN needs SQLite 3.35 (2021).
The pending-refresh tests keep their lock-out cases, now under the
name of what they test, interrupted refreshes; the test that pinned
the flag goes, and the date-filtered one no longer sets it. Four
fixtures that called update_project_aggregates only to clear the flag
after a bare entry write stop doing so. A test upgrades a cache as 015
left it (flag set, a stale session count) through 016: the column is
gone, the total is zero, no file is re-parsed, and the next refresh
recomputes the count.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
A refresh removes its spool when it ends, whichever way it ends; only a
process killed mid-parse leaves one, and it then costs disk, of the
order of the modified files' compressed rows, until something removes
it. The pass does, under its lock, right after the WAL trim: every
spool beside the cache whose owning process (the pid in its name) is
gone. One whose process is alive may be mid refresh and is left alone.
Liveness is a signal-0 kill on POSIX and OpenProcess on Windows.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…project
A cursor the scope's body left unexhausted keeps a statement active on
the connection, and DETACH then fails with "database spool is locked".
That failure replaced a committed merge's success with an error, and
on the exception path replaced the body's own exception with one that
reads as contention (SQLITE_LOCKED), so a pass would have retried the
project; under a pass's leased connection the spool also stayed
attached, and every later scope on that connection failed at ATTACH.
The scope now records an attachment it could not release and releases
it at the next scope's entry on that connection (views, attachment and
file), or at the connection's close.
A manager with no project row has nothing to spool (every write of
its returns early), so the scope passes through instead of building
an overlay around project id 0.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
The record of a spool a scope could not DETACH was keyed by the
connection's address, which nothing cleared when the connection
closed, so a later connection allocated at the same address inherited
it and its first scope failed at entry, DETACHing a spool it never
had. The record is keyed on the connection object now, dropped when
the connection closes (a batch's, a lease's, or one the corruption
path drops), with the file unlinked then, and the release checks the
attachment before it DETACHes.
Also pins that a spooled tail reads after the file's rows under the
overlay (the id offset past the cache's last), which the incremental
path's prefix check relies on.
Test: a scope ends over an active statement inside a batch that then
closes its connection, and twenty fresh scopes follow on the same
manager: every one commits, and no spool file is left.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
…ches it
Migration 016 keeps 015's heal by zeroing the message total of a
project the flag still marked: a zero total takes the full refresh on
the next run. That held in ensure_fresh_cache, but a hierarchy pass
only refreshes a project it plans work for, and without the combined
output (the mode the help text recommends for Obsidian) work meant
modified files, stale sessions or a theme change: a zeroed project
stayed at zero messages on the index until one of its files changed.
The flag had made every file read as modified, so it never met this.
The plan now counts a populated project with a zero cached total as
work, through a one-query accessor rather than the project data that
loads every session row. A project whose files hold no messages plans
work on every pass by the same rule, as ensure_fresh_cache already
refreshed it on every direct call: a few milliseconds, measured.
Test: a healthy cache marked as 015 leaves it, upgraded through 016,
then one pass, with and without the combined output: the total and
the session counts are back, and the index does not read zero
messages. Red without the combined output.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
A date-filtered --all-projects run converts the projects active in its
window and plans no work for the others. A project migration 016
zeroed that is idle in the window was among the others, so a user who
only ever runs windowed passes (a daily --from-date today) kept every
idle project at zero messages on the index after upgrading; the
unfiltered rule had counted a zero cached total as work already. The
window rule counts it too.
Test: an idle project and an active one, a warm pass, the flag as 015
leaves it, 016, then two passes windowed on the active project's day:
both totals are back, with and without the combined output. Red
without the term (the idle project stayed at zero).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Migration 016 drops a column, which SQLite only supports from 3.35. On
an older SQLite it failed as a bare syntax error after its UPDATE had
committed; unrecorded, it failed the same way on every run, and every
CacheManager reported it as a warning while the pass ran on cacheless.
The migration runner now checks the version before it opens the file
(MIN_SQLITE_VERSION, SQLiteTooOldError, not a DatabaseError so a cache
is never mistaken for corrupt and deleted). convert, serve and watch
check it once before doing anything and exit 1 with one line naming
3.35.0 and the version found, plus the way out each has: --no-cache
for convert (a single file never needs the cache), --no-convert for
serve. README and CONTRIBUTING state the requirement.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Refresh B ran on A's thread, where it was handed A's leased connection
with A's spool attached, and failed on attaching its own ("database
spool is already in use"). The pass reported the project failed, and
the repair pass after it hid that: the test passed without B ever
committing.
B now runs on its own thread, so on its own connection. The test
asserts that B commits its parse (6 rows), that A's refresh returns,
that A's snapshot then stands whole (its rows, its file record from
the older stat, its session row), so the file reads modified, and that
the next pass repairs it. A is the refresh alone, not a pass: a pass
goes on to render, and the render writes the entries of a file changed
since the refresh outside any refresh, as current, under the old
session rows (also through the full-load render, and without any
overlap). That hole is the render's, and stays out of this test.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Outside a pass there is no thread lease, and B got a connection of its
own on A's thread too: putting B back there left the test green. Under
the lease a pass holds it fails as it did in the pass, on attaching its
spool, which is the failure the thread is there to avoid.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Past its gate, watch converts once and then loops until interrupted, so
under CliRunner a missing gate hung the test (stopped at 280 s in
review) instead of failing it. The test now makes both steps raise:
without the gate it is red at once, with "watch went past its SQLite
gate" in the output.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The module docstring said the flag the render's entry write leaves set is
what makes the next run refresh the grown file. Migration 016 dropped the
flag, so the sentence now describes how it was, not how it is.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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cboos
changed the title
Closes #374.
A project's cache refresh now commits as one transaction, or not at all. While it parses, each file's entry rows go to a private SQLite spool file beside the cache (
<cache>.spool-<pid>-<n>,refresh_spool.py: journal in memory, nothing synced, this process's own), with no shared lock held and the serialising where it was; the session rows, project aggregates and cross-session sidecar derived from them are deferred; and one write transaction at the end ofCacheManager.atomic_refresh()attaches the spool, copies each file's rows in withINSERT … SELECT(no Python per row under the lock), runs the deferred writes, and commits. Both refresh paths ofensure_fresh_cache_detailedrun inside that scope; a declined incremental attempt falls through to the full load in the same scope, which finds the attempt's parsed files in the spool, so a decline costs no second parse.What that gives:
serve --watchtick, or a pass whose lock degraded) commit two self-consistent snapshots: the later wins, and if it parsed older files itscached_filesrows say so and the next run repairs it. That was the known limit of (Claude) Survive cache lock contention, redo interrupted refreshes, exit non-zero on lost projects #365's flag.DETACHfail; the scope then records the attachment and the next scope on that connection, or the connection's close, releases it, so neither a committed merge reads as a failure nor the body's own exception is replaced. The release checksPRAGMA database_listbefore detaching; with the record keyed on the connection object and dropped at every close, that check is unreachable belt-and-braces, kept on purpose.The overlay. The incremental refresh reads back the rows it has just written (file states, uuid owners, request ids, the closure's entries). Inside a scope, two TEMP views named
cached_filesandmessagesshadow the tables for every unqualified read on the scope's connection: each is the table minus the rows the spooled files replace,UNION ALLthe spool's rows, built from the tables' own column lists; a new file reads under a provisional id and a spooled tail after the file's rows. No read helper changes, the cache's side keeps its indexes and the spool carries its own (query plans checked by a test), and a write through the shadow fails, which is the right tripwire.The flag retired. Migration 015's
refresh_pendingmarked a refresh that had written entry rows but not yet the derived rows, so the next run would redo it in full. There is no such state to mark now, so the flag goes with its rules: every entry write setting it,get_modified_filesreporting every file while set, the incremental path declining while set, the date-filter and Codex special cases, and the aggregates write clearing it last. Migration 016 drops the column and keeps 015's one-time heal: a project the flag still marks (015 marked every project of a cache it upgraded, since nothing else can tell) gets its message total zeroed, which the next run reads as a cache to refresh in full, served from the cached entries since no file is modified. 015 never shipped in a release, so every cache in the wild runs 015 and 016 back to back on upgrade. A hierarchy pass plans work for a populated project whose cached total is zero, in the unfiltered rule and in the date-window rule of #389 alike, so the heal reaches--combined noruns and a user who only ever runs windowed passes.ALTER TABLE … DROP COLUMNneeds SQLite 3.35 (2021), so the cache now requires it: on an older SQLite,convert,serveandwatchexit 1 with a message naming the version found and pointing to a newer Python or--no-cache(test/test_cli_sqlite_requirement.py). Every interpreter on the CI matrix bundles a newer one.Orphan spools. A refresh removes its spool when it ends, whichever way; only a process killed mid-parse leaves one. A pass removes the spools of dead processes before it starts, under its lock (pid liveness: signal 0 on POSIX,
OpenProcesson Windows).Measured, cold refresh of the largest project of a frozen 32-project archive copy (863 MB on disk with agent files, 34 trunk files, 366 MB cache), refresh only, fresh cache, a driver that times every
write_transactionand samples the WAL and spool sizes at 50 ms; four arms interleaved,mainthen this branch, twice:(The first branch arm ran while something else loaded the box; the second is the clean one.)
The known trade, stated plainly. On a cold refresh of a large project the branch holds the write lock once for 8–12 s where
mainheld it 267 times for the same total (2.3 s at most), and the WAL peaks at the whole project's rows (368 MB against 112 MB) because nothing checkpoints inside a transaction; the end-of-pass checkpoint truncates it. For the pool's siblings that is the same wait in one piece; for a foreign process with the 30 s cache timeout one such hold fits, but a cold pass merging several large projects at once stacks them. Daily runs merge small deltas and are unaffected. Wall time is within 2 s on the clean pair: the spool is written once and read back.Not changed: the render records (
update_html_cache,update_page_cache), which are self-validating through the staleness check; the search catch-up; the pass lock; the Codex wholesale path, which keeps its direct writes (it re-parses every rollout each run and heals throughis_transcript_stale).Tests:
test/test_cache_atomic_refresh.py(26: an interrupted refresh leaves every table byte-identical on either path, one BEGIN per refresh and invisible to another connection until it commits, row-for-row equality with the direct writes, the spooled-tail row check and its fallback, the sidecar savepoint, reads inside a scope seeing the spooled rows, the overlay's query plans, two overlapping refreshes leaving a repairable cache, a statement left active over the overlay, a leftover spool record not outliving its connection, migration 016's heal through a pass with and without the combined output, unfiltered and date-windowed);test/test_refresh_spool.py(3); the five lock-out cases kept intest/test_cache_interrupted_refresh.py(renamed fromtest_cache_refresh_pending.py); thesqlite3.connectcensus classifies the spool's connection. Docs: the cache bullet in CONTRIBUTING.md,dev-docs/application_model.md§ 2.3 and the migrations list.🤖 Generated with Claude Code
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