fix(stable_id): recursive job to fill stable_ids

app/jobs/migrations/backfill_stable_id_job.rb

@@ -1,13 +1,18 @@
 class Migrations::BackfillStableIdJob < ApplicationJob
   queue_as :low_priority
 
-  def perform(dossier_id)
+  BATCH = 100_000
+
+  def perform(iteration)
     sql = "UPDATE champs SET stable_id = t.stable_id, stream = 'main'
       FROM types_de_champ t
         WHERE champs.type_de_champ_id = t.id
-        AND champs.dossier_id = ?
-        AND champs.stable_id IS NULL;"
-    query = ActiveRecord::Base.sanitize_sql_array([sql, dossier_id])
+        AND champs.id IN (SELECT id FROM champs WHERE champs.stable_id IS NULL LIMIT ?);"
+    query = ActiveRecord::Base.sanitize_sql_array([sql, BATCH])
     ActiveRecord::Base.connection.execute(query)
+
+    if Champ.exists?(stable_id: nil)
+      Migrations::BackfillStableIdJob.set(wait: 2.seconds).perform_later(iteration + 1)
+    end
   end
 end

app/tasks/maintenance/backfill_champs_stable_id_task.rb

@@ -2,19 +2,10 @@
 
 module Maintenance
   class BackfillChampsStableIdTask < MaintenanceTasks::Task
-    def collection
-      Dossier.select(:id)
-    end
+    no_collection
 
-    def process(dossier)
-      if Champ.exists?(dossier_id: dossier.id, stable_id: nil)
-        day = 24 * 60 * 60 # 24 hours in seconds
-        wait = rand(0...(day * 4)).seconds # every second over 4 days
-
-        Migrations::BackfillStableIdJob
-          .set(wait:)
-          .perform_later(dossier.id)
-      end
+    def process
+      Migrations::BackfillStableIdJob.perform_later(0)
     end
   end
 end