Reduce PatientStatusUpdater batch size to improve performance

jhenderson · jhenderson · commit 1518701cf4d9 · 2026-03-31T16:15:44.000+01:00
While working on needs-consent sub-statuses and running
data-replication performance tests, we found that large batches
were slow to process, while a smaller batch size of 1000
completed significantly faster.
diff --git a/app/lib/patient_status_updater.rb b/app/lib/patient_status_updater.rb
@@ -51,7 +51,7 @@ def update_programme_statuses!
         :vaccination_records,
         :parents
       )
-      .find_in_batches(batch_size: 10_000) do |batch|
+      .find_in_batches do |batch|
         batch.each(&:assign)
 
         Patient::ProgrammeStatus.import!(

Original file line number	Diff line number	Diff line change
`@@ -51,7 +51,7 @@ def update_programme_statuses!`
`51`	`51`	`:vaccination_records,`
`52`	`52`	`:parents`
`53`	`53`	`)`
`54`		`- .find_in_batches(batch_size: 10_000) do \|batch\|`
	`54`	`+ .find_in_batches do \|batch\|`
`55`	`55`	`batch.each(&:assign)`
`56`	`56`
`57`	`57`	`Patient::ProgrammeStatus.import!(`