chore: Move agent availability to Account level (#3074)

- Move agent availability to the account level

db/migrate/20210923190418_add_online_status_to_account_users.rb

@@ -0,0 +1,21 @@
+class AddOnlineStatusToAccountUsers < ActiveRecord::Migration[6.1]
+  def change
+    change_table :account_users, bulk: true do |t|
+      t.integer :availability, default: 0, null: false
+      t.boolean :auto_offline, default: true, null: false
+    end
+
+    update_existing_user_availability
+  end
+
+  private
+
+  def update_existing_user_availability
+    User.find_in_batches do |user_batch|
+      user_batch.each do |user|
+        availability = user.availability
+        user.account_users.update(availability: availability)
+      end
+    end
+  end
+end

db/schema.rb

@@ -35,6 +35,8 @@ ActiveRecord::Schema.define(version: 2021_09_29_150415) do
     t.datetime "created_at", precision: 6, null: false
     t.datetime "updated_at", precision: 6, null: false
     t.datetime "active_at"
+    t.integer "availability", default: 0, null: false
+    t.boolean "auto_offline", default: true, null: false
     t.index ["account_id", "user_id"], name: "uniq_user_id_per_account_id", unique: true
     t.index ["account_id"], name: "index_account_users_on_account_id"
     t.index ["user_id"], name: "index_account_users_on_user_id"