All four alert code paths that previously loaded the entire SavedSearch
table into memory are replaced with bounded batch iteration backed by
the idx_savedsearch_alert_enabled partial index (merged in GOO-118).
Batch size is 500 rows; order-by is createdAt ASC, which matches the
index definition so the planner uses it for both the WHERE clause and
the cursor predicate.
Changed files:
- saved-search-alert.handler.ts: keyset loop on createdAt with
alertEnabled=true, ALERT_BATCH_SIZE=500
- saved-search-alert-cron.service.ts: same pagination loop, removes
the early-return on empty set (loop exits naturally on first empty page)
- residential-events.listener.ts: ResidentialPriceDropListener and
ResidentialNewListingInProjectListener both paginated; select now
includes createdAt to advance the cursor; shared ALERT_BATCH_SIZE
Tests:
- saved-search-alert.handler.spec.ts: adds createdAt to mock rows, adds
3-page pagination test and orderBy/take assertion
- residential-events.listener.spec.ts: adds createdAt to mock rows, adds
501-row pagination test verifying cursor advance on second call (9
existing tests all pass)
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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