diff --git a/app/models/conference.rb b/app/models/conference.rb
index 2f70f75..02a7a0a 100644
--- a/app/models/conference.rb
+++ b/app/models/conference.rb
@@ -18,11 +18,11 @@ class Conference < ActiveRecord::Base
   has_many :conflict_counts, through: :events
   has_many :volunteer_teams
   has_many :volunteers
-  has_one :call_for_participation, dependent: :destroy
+  has_one :call_for_participation
   has_many :participants, -> { distinct }, class_name: 'User', through: :events
   has_many :participant_profiles, class_name: 'PersonalProfile'
   has_many :slots, through: :halls
-  has_many :feedbacks, as: :feedback_receiving, dependent: :destroy
+  has_many :feedbacks, as: :feedback_receiving
   has_many :editions, primary_key: :host_name, foreign_key: :host_name, class_name: 'Conference'
   has_many :events_of_all_editions, through: :editions, source: :events
 
diff --git a/db/migrate/20190428101041_add_referential_integrity.rb b/db/migrate/20190428101041_add_referential_integrity.rb
new file mode 100644
index 0000000..ef5f2e1
--- /dev/null
+++ b/db/migrate/20190428101041_add_referential_integrity.rb
@@ -0,0 +1,40 @@
+class AddReferentialIntegrity < ActiveRecord::Migration[5.2]
+  def change
+    remove_foreign_key :call_for_participations, :conferences
+    add_foreign_key :call_for_participations, :conferences, on_delete: :cascade
+
+    add_foreign_key :conference_translations, :conferences, on_delete: :cascade
+
+    add_foreign_key :conflict_counts, :events, column: :left_id, on_delete: :cascade
+    add_foreign_key :conflict_counts, :events, column: :right_id, on_delete: :cascade
+
+    add_foreign_key :event_type_translations, :event_types, on_delete: :cascade
+
+    remove_foreign_key :event_types, :conferences
+    add_foreign_key :event_types, :conferences, on_delete: :cascade
+
+    add_foreign_key :hall_translations, :halls, on_delete: :cascade
+
+    add_foreign_key :halls, :conferences, on_delete: :cascade
+
+    add_foreign_key :personal_profiles, :users, on_delete: :cascade
+    add_foreign_key :personal_profiles, :conferences
+
+    add_foreign_key :propositions, :users, column: :proposer_id
+
+    add_foreign_key :slots, :halls, on_delete: :cascade
+    add_foreign_key :slots, :events, on_delete: :nullify
+
+    add_foreign_key :track_translations, :tracks, on_delete: :cascade
+
+    add_foreign_key :tracks, :conferences, on_delete: :cascade
+
+    add_foreign_key :volunteer_team_translations, :volunteer_teams, on_delete: :cascade
+
+    remove_foreign_key :volunteer_teams, :conferences
+    add_foreign_key :volunteer_teams, :conferences, on_delete: :cascade
+
+    add_foreign_key :volunteer_teams_volunteers, :volunteers, on_delete: :cascade
+    add_foreign_key :volunteer_teams_volunteers, :volunteer_teams, on_delete: :cascade
+  end
+end