Reduce preloading in school consent jobs (#3310)

This reduces the amount of preloading performed in the school consent
request and reminders jobs to try and fix out-of-memory issues we're
seeing in production. This has been run once in production and the job
has ran successfully.

Author: thomasleese

app/jobs/school_consent_reminders_job.rb

@@ -7,17 +7,11 @@ def perform
     sessions =
       Session
         .send_consent_reminders
-        .includes(
-          :programmes,
-          patient_sessions: {
-            patient: %i[consents consent_notifications parents]
-          }
-        )
-        .preload(:session_dates)
-        .eager_load(:location)
+        .joins(:location)
+        .includes(:session_dates, :programmes, :patient_sessions, :location)
         .merge(Location.school)
 
-    sessions.each do |session|
+    sessions.find_each(batch_size: 1) do |session|
       next unless session.open_for_consent?
 
       session.patient_sessions.each do |patient_session|

app/jobs/school_consent_requests_job.rb

@@ -7,21 +7,11 @@ def perform
     sessions =
       Session
         .send_consent_requests
-        .includes(
-          :programmes,
-          patient_sessions: {
-            patient: [
-              :consents,
-              :parents,
-              { consent_notifications: :programmes }
-            ]
-          }
-        )
-        .preload(:session_dates)
-        .eager_load(:location)
+        .joins(:location)
+        .includes(:session_dates, :programmes, :patient_sessions, :location)
         .merge(Location.school)
 
-    sessions.each do |session|
+    sessions.find_each(batch_size: 1) do |session|
       next unless session.open_for_consent?
 
       session.patient_sessions.each do |patient_session|