Add further indices to improve slots performance

db/migrate/20241215162334_add_appointments_indexes_for_slots.rb

@@ -0,0 +1,6 @@
+class AddAppointmentsIndexesForSlots < ActiveRecord::Migration[6.1]
+  def change
+    add_index :appointments, %i(start_at end_at)
+    add_index :appointments, :status
+  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: 2024_11_25_195323) do
+ActiveRecord::Schema.define(version: 2024_12_15_162334) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_stat_statements"
@@ -129,7 +129,9 @@
     t.index ["guider_id"], name: "index_appointments_on_guider_id"
     t.index ["schedule_type"], name: "index_appointments_on_schedule_type"
     t.index ["start_at", "end_at", "guider_id"], name: "index_appointments_on_start_at_and_end_at_and_guider_id"
+    t.index ["start_at", "end_at"], name: "index_appointments_on_start_at_and_end_at"
     t.index ["start_at"], name: "index_appointments_on_start_at"
+    t.index ["status"], name: "index_appointments_on_status"
   end
 
   create_table "audits", id: :serial, force: :cascade do |t|