perf(champs): add stable_id index on champs

db/migrate/20240416062900_add_stable_id_index_to_champs.rb

@@ -0,0 +1,7 @@
+class AddStableIdIndexToChamps < ActiveRecord::Migration[7.0]
+  disable_ddl_transaction!
+
+  def change
+    add_index :champs, :stable_id, algorithm: :concurrently
+  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[7.0].define(version: 2024_04_15_192417) do
+ActiveRecord::Schema[7.0].define(version: 2024_04_16_062900) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_buffercache"
   enable_extension "pg_stat_statements"
@@ -269,6 +269,7 @@ ActiveRecord::Schema[7.0].define(version: 2024_04_15_192417) do
     t.index ["etablissement_id"], name: "index_champs_on_etablissement_id"
     t.index ["parent_id"], name: "index_champs_on_parent_id"
     t.index ["row_id"], name: "index_champs_on_row_id"
+    t.index ["stable_id"], name: "index_champs_on_stable_id"
     t.index ["type"], name: "index_champs_on_type"
     t.index ["type_de_champ_id", "dossier_id", "row_id"], name: "index_champs_on_type_de_champ_id_and_dossier_id_and_row_id", unique: true
     t.index ["type_de_champ_id"], name: "index_champs_on_type_de_champ_id"