Cleanup: remove champ_pj feature flag

lib/tasks/deployment/20181210185634_remove_champ_pj_feature.rake

@@ -0,0 +1,20 @@
+namespace :after_party do
+  desc 'Deployment task: remove_champ_pj_feature'
+  task remove_champ_pj_feature: :environment do
+    rake_puts "Running deploy task 'remove_champ_pj_feature'"
+
+    Administrateur.find_by_sql(
+      <<~SQL
+        SELECT administrateurs.*
+        FROM administrateurs, lateral jsonb_each(features)
+        WHERE key = 'champ_pj'
+        GROUP BY id
+      SQL
+    ).each do |admin|
+      admin.features.delete('champ_pj')
+      admin.save
+    end
+
+    AfterParty::TaskRecord.create version: '20181210185634'
+  end
+end