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Fixed queued email analytics updates after processing failures - #31068

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Stacked on #30842. Addresses this review comment.

When event processing fails partway through a batch, queued recipient timestamps remain in shared storage until a later job flushes them. That delays persistence and credits the writes to the later job.

Flush those timestamps before rethrowing the processing error. If the flush also fails, log that error and preserve the original one. Successful batches and sequential processing keep their existing behavior.

This changes failure-path persistence: queued timestamps can reach the database and final aggregation during the failed run. Flushing earlier can also lock in a timestamp before a later batch supplies an earlier one, because writes only fill null timestamps.

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Walkthrough

Newsletter event storage now flushes and clears delivered, opened, and permanent-failed updates in sequence. If a category flush fails, it reports counts from completed categories through an optional callback before rethrowing the error. The batch processor merges those counts and attempts to flush queued updates after event-processing failures. If both operations fail, it logs the flush error and preserves the processing error. Scroll persistence skips saving a new sidebar history entry while it is loading.

Suggested reviewers: 9larsons

Priority: ⬇️ Low

Change: Bug fix

Merge Risk: ⚪ Minimal · up to ac437

The changes preserve queued email analytics through partial failures and avoid saving scroll positions while a new entry is loading. No new actionable merge risk was established.

🚥 Pre-merge checks | ✅ 6
✅ Passed checks (6 passed)
Check name Status Explanation
Title check ✅ Passed The title clearly summarizes the primary change: flushing queued email analytics updates after processing failures.
Description check ✅ Passed The description directly explains the failure-path persistence change, error handling, and preserved processing behavior.
Linked Issues check ✅ Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check ✅ Passed Check skipped because no linked issues were found for this pull request.
Type-Safe Boundaries ✅ Passed The PR does not introduce an unvalidated boundary read or a new type bypass. The new onPartialFailure callback forwards existing internal StoredEventCounts data between modules. The TypeScript cha…
New Files Are Typescript ✅ Passed The authoritative PR diff contains only modified files. git diff --diff-filter=A reports no added files, so the PR adds no .js, .jsx, .cjs, or .mjs source file.
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Codecov Report

❌ Patch coverage is 66.66667% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.16%. Comparing base (1d7c38e) to head (b75bfbc).
⚠️ Report is 2 commits behind head on main.

Files with missing lines Patch % Lines
...tics/newsletter-email-analytics-batch-processor.js 53.33% 7 Missing ⚠️
...es/email-service/newsletter-email-event-storage.js 80.00% 2 Missing ⚠️
Additional details and impacted files
@@            Coverage Diff             @@
##             main   #31068      +/-   ##
==========================================
+ Coverage   69.12%   69.16%   +0.03%     
==========================================
  Files        1629     1629              
  Lines       59475    59490      +15     
  Branches    10274    10274              
==========================================
+ Hits        41115    41145      +30     
+ Misses      16061    16056       -5     
+ Partials     2299     2289      -10     
Flag Coverage Δ
e2e-tests 70.76% <66.66%> (+0.04%) ⬆️

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Base automatically changed from kevin-email-analytics-recovered-events to main September 29, 2026 10:01
@kevinansfield
kevinansfield force-pushed the kevin-email-analytics-flush-on-failure branch from de945ef to fe79e5b Compare September 29, 2026 10:34

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Actionable comments posted: 1


  • 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at
@ghost/core/core/server/services/email-analytics/newsletter-email-analytics-batch-processor.js:
- Line 65: Update the flush flow around flushBatchedUpdates so successful
category counts remain available when a later category flush fails, and clear
pending updates only for categories that were successfully persisted. Ensure
retries report the already-delivered rows rather than losing their counts.

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ghost/core/test/unit/server/services/email-analytics/newsletter-email-analytics-batch-processor.test.js (1)

652-702: LGTM!

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E2E Tests Failed

To view the Playwright test report locally, run:

REPORT_DIR=$(mktemp -d) && gh run download 36556448230 -n playwright-report -D "$REPORT_DIR" && npx playwright show-report "$REPORT_DIR"

kevinansfield added a commit that referenced this pull request Sep 29, 2026
ref #31068

A later category failure could hide earlier persisted counts and cause the retry to reprocess those updates as zero affected rows.

- Report partial counts to the batch result before rethrowing.
- Clear each category only after its write succeeds.
- Cover failed flushes and retry accounting.
@kevinansfield
kevinansfield force-pushed the kevin-email-analytics-flush-on-failure branch from fe79e5b to 9a972f2 Compare September 29, 2026 11:39
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E2E Tests Failed

To view the Playwright test report locally, run:

REPORT_DIR=$(mktemp -d) && gh run download 36563148973 -n playwright-report -D "$REPORT_DIR" && npx playwright show-report "$REPORT_DIR"

kevinansfield added a commit that referenced this pull request Sep 29, 2026
ref #31068

A later category failure could hide earlier persisted counts and cause the retry to reprocess those updates as zero affected rows.

- Report partial counts to the batch result before rethrowing.
- Clear each category only after its write succeeds.
- Cover failed flushes and retry accounting.
@kevinansfield
kevinansfield force-pushed the kevin-email-analytics-flush-on-failure branch from 9a972f2 to ac437c6 Compare September 29, 2026 12:07
ref #30842

Failed batches left recipient timestamps queued for a later job to write,
which delayed persistence and attributed the writes to that job.

- Flush queued timestamps before rethrowing a processing error.
- Log a secondary flush failure while preserving the original error.
- Cover queue cleanup, count attribution, and error propagation.
ref #31068

A later category failure could hide earlier persisted counts and cause the retry to reprocess those updates as zero affected rows.

- Report partial counts to the batch result before rethrowing.
- Clear each category only after its write succeeds.
- Cover failed flushes and retry accounting.

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