Add missing etablissement_id index on exercices table (-600ms)

db/migrate/20210416160721_add_index_to_exercice_etablissement_id.rb

@@ -0,0 +1,5 @@
+class AddIndexToExerciceEtablissementId < ActiveRecord::Migration[6.1]
+  def change
+    add_index :exercices, :etablissement_id
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2021_04_16_074049) do
+ActiveRecord::Schema.define(version: 2021_04_16_160721) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -325,6 +325,7 @@ ActiveRecord::Schema.define(version: 2021_04_16_074049) do
     t.datetime "date_fin_exercice"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.index ["etablissement_id"], name: "index_exercices_on_etablissement_id"
   end
 
   create_table "experts", force: :cascade do |t|