really faster stats by precomputing some of them

db/migrate/20201002124154_create_stats.rb

@@ -0,0 +1,18 @@
+class CreateStats < ActiveRecord::Migration[6.0]
+  def change
+    create_table :stats do |t|
+      t.bigint :dossiers_not_brouillon, default: 0
+      t.bigint :dossiers_brouillon, default: 0
+      t.bigint :dossiers_en_construction, default: 0
+      t.bigint :dossiers_en_instruction, default: 0
+      t.bigint :dossiers_termines, default: 0
+      t.bigint :dossiers_depose_avant_30_jours, default: 0
+      t.bigint :dossiers_deposes_entre_60_et_30_jours, default: 0
+
+      t.jsonb :dossiers_cumulative, null: false, default: '{}'
+      t.jsonb :dossiers_in_the_last_4_months, null: false, default: '{}'
+
+      t.timestamps
+    end
+  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: 2020_09_30_143755) do
+ActiveRecord::Schema.define(version: 2020_10_02_124154) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -586,6 +586,20 @@ ActiveRecord::Schema.define(version: 2020_09_30_143755) do
     t.index ["administrateur_id"], name: "index_services_on_administrateur_id"
   end
 
+  create_table "stats", force: :cascade do |t|
+    t.bigint "dossiers_not_brouillon", default: 0
+    t.bigint "dossiers_brouillon", default: 0
+    t.bigint "dossiers_en_construction", default: 0
+    t.bigint "dossiers_en_instruction", default: 0
+    t.bigint "dossiers_termines", default: 0
+    t.bigint "dossiers_depose_avant_30_jours", default: 0
+    t.bigint "dossiers_deposes_entre_60_et_30_jours", default: 0
+    t.jsonb "dossiers_cumulative", default: "{}", null: false
+    t.jsonb "dossiers_in_the_last_4_months", default: "{}", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+  end
+
   create_table "task_records", id: false, force: :cascade do |t|
     t.string "version", null: false
   end