diff --git a/lib/tasks/deployment/20220727091220_cleanup_foreign_keys.rake b/lib/tasks/deployment/20220727091220_cleanup_foreign_keys.rake
new file mode 100644
index 000000000..96c363afc
--- /dev/null
+++ b/lib/tasks/deployment/20220727091220_cleanup_foreign_keys.rake
@@ -0,0 +1,79 @@
+namespace :after_party do
+  desc 'Deployment task: cleanup_foreign_keys'
+  task cleanup_foreign_keys: :environment do
+    puts "Running deploy task 'cleanup_foreign_keys'"
+
+    champs_with_invalid_type_de_champ = Champ.where.not(type_de_champ_id: nil).where.missing(:type_de_champ)
+    champs_with_invalid_type_de_champ_count = champs_with_invalid_type_de_champ.count
+
+    if champs_with_invalid_type_de_champ_count > 0
+      progress = ProgressReport.new(champs_with_invalid_type_de_champ_count)
+      Champ.where.not(type_de_champ_id: nil).in_batches(of: 600_000) do |champs|
+        count = champs.where.missing(:type_de_champ).count
+        if count > 0
+          champs.where.missing(:type_de_champ).destroy_all
+          progress.inc(count)
+        end
+      end
+      progress.finish
+    else
+      puts "No champs with invalid type_de_champ found"
+    end
+
+    champs_with_invalid_dossier = Champ.where.not(dossier_id: nil).where.missing(:dossier)
+    champs_with_invalid_dossier_count = champs_with_invalid_dossier.count
+
+    if champs_with_invalid_dossier_count > 0
+      progress = ProgressReport.new(champs_with_invalid_dossier_count)
+      Champ.where.not(dossier_id: nil).in_batches(of: 600_000) do |champs|
+        count = champs.where.missing(:dossier).count
+        if count > 0
+          champs.where.missing(:dossier).destroy_all
+          progress.inc(count)
+        end
+      end
+      progress.finish
+    else
+      puts "No champs with invalid dossier found"
+    end
+
+    champs_with_invalid_etablissement = Champ.where.not(etablissement_id: nil).where.missing(:etablissement)
+    champs_with_invalid_etablissement_count = champs_with_invalid_etablissement.count
+
+    if champs_with_invalid_etablissement_count > 0
+      progress = ProgressReport.new(champs_with_invalid_etablissement_count)
+      Champ.where.not(etablissement_id: nil).in_batches(of: 10_000) do |champs|
+        count = champs.where.missing(:etablissement).count
+        if count > 0
+          champs.where.missing(:etablissement).update_all(etablissement_id: nil)
+          progress.inc(count)
+        end
+      end
+      progress.finish
+    else
+      puts "No champs with invalid etablissement found"
+    end
+
+    etablissements_with_invalid_dossier = Etablissement.where.not(dossier_id: nil).where.missing(:dossier)
+    etablissements_with_invalid_dossier_count = etablissements_with_invalid_dossier.count
+
+    if etablissements_with_invalid_dossier_count > 0
+      progress = ProgressReport.new(etablissements_with_invalid_dossier_count)
+      Etablissement.where.not(dossier_id: nil).in_batches(of: 10_000) do |etablissements|
+        count = etablissements.where.missing(:dossier).count
+        if count > 0
+          etablissements.where.missing(:dossier).update_all(dossier_id: nil)
+          progress.inc(count)
+        end
+      end
+      progress.finish
+    else
+      puts "No etablissements with invalid dossier found"
+    end
+
+    # Update task as completed.  If you remove the line below, the task will
+    # run with every deploy (or every time you call after_party:run).
+    AfterParty::TaskRecord
+      .create version: AfterParty::TaskRecorder.new(__FILE__).timestamp
+  end
+end