[DEX-2851] feat: user replica for deletion

Author: bibendi

CHANGELOG.md

@@ -13,6 +13,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+## [6.19.0] - 2025-02-11
+
+### Added
+
+- Querying minimum `created_at` for deletion now uses a replica database to reduce primary database load
+
 ## [6.18.0] - 2025-02-04
 
 ### Added

app/jobs/sbmt/outbox/base_delete_stale_items_job.rb

@@ -117,7 +117,9 @@ def delete_items_in_batches_with_between(waterline, statuses)
         table = item_class.arel_table
         batch_size = item_class.config.deletion_batch_size
         time_window = item_class.config.deletion_time_window
-        min_date = item_class.where(table[:status].in(statuses)).minimum(:created_at)
+        min_date = Outbox.database_switcher.use_slave do
+          item_class.where(table[:status].in(statuses)).minimum(:created_at)
+        end
         deleted_count = nil
 
         while min_date && min_date < waterline
@@ -174,7 +176,9 @@ def mysql_delete_in_batches(waterline_failed, waterline_delivered)
       def delete_items_in_batches_with_between_mysql(waterline, statuses)
         batch_size = item_class.config.deletion_batch_size
         time_window = item_class.config.deletion_time_window
-        min_date = item_class.where(status: statuses).minimum(:created_at)
+        min_date = Outbox.database_switcher.use_slave do
+          item_class.where(status: statuses).minimum(:created_at)
+        end
         deleted_count = nil
 
         while min_date && min_date < waterline

lib/sbmt/outbox/version.rb

@@ -2,6 +2,6 @@
 
 module Sbmt
   module Outbox
-    VERSION = "6.18.0"
+    VERSION = "6.19.0"
   end
 end