Save last trade activity time onto User

In impress-2020, we do a big slow query to figure out which users have
been active in trades recently. Now, we cache that timestamp on the
User model.

This won't have any immediate effect; it's to clear the way for Classic
DTI to receive the better trade ratios feature people like from 2020.

I also added some unit testing infra because I finally wanted it! for
all the ways you can trigger this timestamp lol

Note too that this is a bit of an unusually complex migration, but my
hope is that the batching and query structure and such helps it run
surprisingly fast! 🤞

.devcontainer/devcontainer.json

@@ -27,6 +27,8 @@
     // we partially override `config/database.yml` to connect to `db`!
     "DATABASE_URL_PRIMARY_DEV": "mysql2://db",
     "DATABASE_URL_OPENNEO_ID_DEV": "mysql2://db",
+    "DATABASE_URL_PRIMARY_TEST": "mysql2://db",
+    "DATABASE_URL_OPENNEO_ID_TEST": "mysql2://db",
 
     // HACK: Out of the box, this dev container doesn't allow installation to
     // the default GEM_HOME, because of a weird thing going on with RVM.

Gemfile

@@ -79,3 +79,8 @@ gem "stackprof", "~> 0.2.25"
 # For monitoring errors in production.
 gem "sentry-ruby", "~> 5.12"
 gem "sentry-rails", "~> 5.12"
+
+# For automated testing.
+group :test do
+	gem 'sqlite3', '~> 1.7'
+end

Gemfile.lock

@@ -297,6 +297,8 @@ GEM
       actionpack (>= 5.2)
       activesupport (>= 5.2)
       sprockets (>= 3.0.0)
+    sqlite3 (1.7.0)
+      mini_portile2 (~> 2.8.0)
     stackprof (0.2.25)
     stringio (3.0.8)
     temple (0.8.2)
@@ -359,6 +361,7 @@ DEPENDENCIES
   sentry-rails (~> 5.12)
   sentry-ruby (~> 5.12)
   sprockets (~> 4.2)
+  sqlite3 (~> 1.7)
   stackprof (~> 0.2.25)
   terser (~> 1.1, >= 1.1.17)
   thread-local (~> 1.1)

app/models/closet_hanger.rb

@@ -4,6 +4,7 @@ class ClosetHanger < ApplicationRecord
   belongs_to :user
 
   delegate :name, to: :item, prefix: true
+  delegate :log_trade_activity, to: :user
 
   validates :item_id, :uniqueness => {:scope => [:user_id, :owned, :list_id]}
   validates :quantity, :numericality => {:greater_than => 0}
@@ -16,6 +17,32 @@ class ClosetHanger < ApplicationRecord
     joins(:item => :translations).where(it[:locale].eq(I18n.locale)).
       order(it[:name].asc)
   }
+  scope :trading, -> {
+    ch = arel_table
+    cl = ClosetList.arel_table
+    u = User.arel_table
+    joins(:user, :list).where(
+      # sigh… our default-lists continue to be a pain
+      (
+        ch[:list_id].not_eq(nil).and(cl[:visibility].gteq(
+          ClosetVisibility[:trading].id))
+      ).or(
+        (
+          ch[:list_id].eq(nil).and(ch[:owned].eq(true))
+        ).and(
+          u[:owned_closet_hangers_visibility].gteq(
+            ClosetVisibility[:trading].id)
+        )
+      ).or(
+        (
+          ch[:list_id].eq(nil).and(ch[:owned].eq(false))
+        ).and(
+          u[:wanted_closet_hangers_visibility].gteq(
+            ClosetVisibility[:trading].id)
+        )
+      )
+    )
+  }
   scope :newest, -> { order(arel_table[:created_at].desc) }
   scope :owned_before_wanted, -> { order(arel_table[:owned].desc) }
   scope :unlisted, -> { where(:list_id => nil) }
@@ -36,6 +63,9 @@ class ClosetHanger < ApplicationRecord
 
   before_validation :merge_quantities, :set_owned_by_list
 
+  after_save :log_trade_activity, if: :trading?
+  after_destroy :log_trade_activity, if: :trading?
+
   def possibly_null_closet_list
     list || user.null_closet_list(owned)
   end

app/models/closet_list.rb

@@ -6,10 +6,15 @@ class ClosetList < ApplicationRecord
   validates :user, :presence => true
   validates :hangers_owned, :inclusion => {:in => [true, false], :message => "can't be blank"}
 
+  delegate :log_trade_activity, to: :user
+
   scope :alphabetical, -> { order(:name) }
   scope :publicly_visible, -> {
     where(arel_table[:visibility].gteq(ClosetVisibility[:public].id))
   }
+  scope :trading, -> {
+    where(arel_table[:visibility].gteq(ClosetVisibility[:trading].id))
+  }
   scope :visible_to, ->(user) {
     condition = arel_table[:visibility].gteq(ClosetVisibility[:public].id)
     condition = condition.or(arel_table[:user_id].eq(user.id)) if user
@@ -17,6 +22,12 @@ class ClosetList < ApplicationRecord
   }
 
   after_save :sync_hangers_owned!
+  after_save :log_trade_activity, if: :trading?
+  after_destroy :log_trade_activity, if: :trading?
+
+  def trading?
+    visibility >= ClosetVisibility[:trading].id
+  end
 
   def sync_hangers_owned!
     if hangers_owned_changed?

app/models/user.rb

@@ -25,6 +25,12 @@ class User < ApplicationRecord
   scope :top_contributors, -> { order('points DESC').where('points > 0') }
 
   after_update :sync_name_with_auth_user!, if: :saved_change_to_name?
+  after_update :log_trade_activity, if: -> user {
+    (user.saved_change_to_owned_closet_hangers_visibility? &&
+      user.owned_closet_hangers_visibility >= ClosetVisibility[:trading].id) ||
+    (user.saved_change_to_wanted_closet_hangers_visibility? &&
+      user.wanted_closet_hangers_visibility >= ClosetVisibility[:trading].id)
+  }
 
   def sync_name_with_auth_user!
     auth_user.name = name
@@ -169,6 +175,10 @@ class User < ApplicationRecord
     contact_neopets_connection.try(:neopets_username)
   end
 
+  def log_trade_activity
+    touch(:last_trade_activity_at)
+  end
+
   def self.points_required_to_pass_top_contributor(offset)
     user = User.top_contributors.select(:points).limit(1).offset(offset).first
     user ? user.points : 0

config/database.yml

@@ -24,6 +24,32 @@ development:
       sql_mode: TRADITIONAL
     migrations_paths: db/openneo_id_migrate
 
+test:
+  primary:
+    # You can override these default settings with this environment variable,
+    # fully or partially. We do this in the .devcontainer setup!
+    url: <%= ENV['DATABASE_URL_PRIMARY_TEST'] %>
+    adapter: mysql2
+    database: openneo_impress_test
+    username: impress_dev
+    password: impress_dev
+    pool: 5
+    variables:
+      sql_mode: TRADITIONAL
+
+  openneo_id:
+    # You can override these default settings with this environment variable,
+    # fully or partially. We do this in the .devcontainer setup!
+    url: <%= ENV['DATABASE_URL_OPENNEO_ID_TEST'] %>
+    adapter: mysql2
+    database: openneo_id_test
+    username: impress_dev
+    password: impress_dev
+    pool: 2
+    variables:
+      sql_mode: TRADITIONAL
+    migrations_paths: db/openneo_id_migrate
+
 production:
   primary:
     url: <%= ENV['DATABASE_URL_PRIMARY'] %>

config/environments/test.rb

@@ -35,7 +35,7 @@ Rails.application.configure do
   config.action_controller.allow_forgery_protection = false
 
   # Store uploaded files on the local file system in a temporary directory.
-  config.active_storage.service = :test
+  # config.active_storage.service = :test
 
   config.action_mailer.perform_caching = false
 

config/initializers/secret_token.rb

@@ -9,7 +9,7 @@
 
 # Make sure your secret_key_base is kept private
 # if you're sharing your code publicly.
-if Rails.env.development?
+if Rails.env.development? || Rails.env.test?
 	# In development, we use a hardcoded secret key, because it doesn't actually
 	# need to be secret!
 	OpenneoImpressItems::Application.config.secret_key_base = "7584841652f89044a8b5a428efa6dfac2461449eb24741a33668cd642130d79f93b0347766ebf4a4d7d5033a263c36431594ad56b5735a7325c8cdda991219c2"

db/migrate/20240119061745_add_last_trade_activity_at_to_users.rb

@@ -0,0 +1,36 @@
+class AddLastTradeActivityAtToUsers < ActiveRecord::Migration[7.1]
+  def change
+    add_column :users, :last_trade_activity_at, :timestamp
+
+    reversible do |direction|
+      direction.up do
+        User.find_in_batches do |users|
+          # Find the last ClosetList/ClosetHanger updated_at timestamp for each
+          # user, for trading lists/hangers only.
+          max_closet_list_updated_at_by_user_id = ClosetList.
+            trading.
+            group(:user_id).
+            where(user_id: users.map(&:id)).
+            maximum(:updated_at)
+          max_closet_hanger_updated_at_by_user_id = ClosetHanger.
+            trading.
+            group(:user_id).
+            where(user_id: users.map(&:id)).
+            maximum(:updated_at)
+
+          # Set `last_trade_activity_at` to the largest such `updated_at` for
+          # that user, or nil if there's none.
+          User.transaction do
+            users.each do |user|
+              user.last_trade_activity_at = [
+                max_closet_list_updated_at_by_user_id[user.id],
+                max_closet_hanger_updated_at_by_user_id[user.id],
+              ].filter(&:present?).max
+              user.save!
+            end
+          end
+        end
+      end
+    end
+  end
+end

db/openneo_id_schema.rb

@@ -11,7 +11,7 @@
 # It's strongly recommended that you check this file into your version control system.
 
 ActiveRecord::Schema[7.1].define(version: 2023_08_07_005748) do
-  create_table "users", id: { type: :integer, unsigned: true }, charset: "utf8mb3", force: :cascade do |t|
+  create_table "users", id: { type: :integer, unsigned: true }, charset: "utf8mb3", collation: "utf8mb3_general_ci", force: :cascade do |t|
     t.string "name", limit: 20, null: false
     t.string "encrypted_password", limit: 64, null: false
     t.string "email", limit: 50, null: false

db/schema.rb

@@ -10,8 +10,8 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
+ActiveRecord::Schema[7.1].define(version: 2024_01_19_061745) do
-  create_table "auth_servers", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "auth_servers", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.string "short_name", limit: 10, null: false
     t.string "name", limit: 40, null: false
     t.text "icon", size: :medium, null: false
@@ -19,7 +19,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.string "secret", limit: 64, null: false
   end
 
-  create_table "campaigns", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "campaigns", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "progress", default: 0, null: false
     t.integer "goal", null: false
     t.boolean "active", null: false
@@ -33,7 +33,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.string "name"
   end
 
-  create_table "closet_hangers", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "closet_hangers", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "item_id"
     t.integer "user_id"
     t.integer "quantity"
@@ -49,7 +49,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.index ["user_id"], name: "index_closet_hangers_on_user_id"
   end
 
-  create_table "closet_lists", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "closet_lists", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.string "name"
     t.text "description"
     t.integer "user_id"
@@ -60,7 +60,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.index ["user_id"], name: "index_closet_lists_on_user_id"
   end
 
-  create_table "color_translations", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "color_translations", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "color_id"
     t.string "locale"
     t.string "name"
@@ -70,13 +70,13 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.index ["locale"], name: "index_color_translations_on_locale"
   end
 
-  create_table "colors", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "colors", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.boolean "basic"
     t.boolean "standard"
     t.boolean "prank", default: false, null: false
   end
 
-  create_table "contributions", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "contributions", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.string "contributed_type", limit: 8, null: false
     t.integer "contributed_id", null: false
     t.integer "user_id", null: false
@@ -85,14 +85,14 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.index ["user_id"], name: "index_contributions_on_user_id"
   end
 
-  create_table "donation_features", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "donation_features", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "donation_id", null: false
     t.integer "outfit_id"
     t.datetime "created_at", precision: nil, null: false
     t.datetime "updated_at", precision: nil, null: false
   end
 
-  create_table "donations", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "donations", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "amount", null: false
     t.string "charge_id", null: false
     t.integer "user_id"
@@ -104,7 +104,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.integer "campaign_id", null: false
   end
 
-  create_table "item_outfit_relationships", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "item_outfit_relationships", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "item_id"
     t.integer "outfit_id"
     t.boolean "is_worn"
@@ -149,7 +149,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.index ["modeling_status_hint"], name: "items_modeling_status_hint"
   end
 
-  create_table "login_cookies", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "login_cookies", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "user_id", null: false
     t.integer "series", null: false
     t.integer "token", null: false
@@ -157,20 +157,20 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.index ["user_id"], name: "login_cookies_user_id"
   end
 
-  create_table "modeling_logs", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "modeling_logs", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.datetime "created_at", precision: nil, null: false
     t.text "log_json", null: false
     t.string "pet_name", limit: 128, null: false
   end
 
-  create_table "neopets_connections", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "neopets_connections", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "user_id"
     t.string "neopets_username"
     t.datetime "created_at", precision: nil, null: false
     t.datetime "updated_at", precision: nil, null: false
   end
 
-  create_table "outfits", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "outfits", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "pet_state_id"
     t.integer "user_id"
     t.datetime "created_at", precision: nil
@@ -193,7 +193,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.index ["swf_asset_id"], name: "parents_swf_assets_swf_asset_id"
   end
 
-  create_table "pet_loads", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "pet_loads", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.string "pet_name", limit: 20, null: false
     t.text "amf", size: :medium, null: false
     t.datetime "created_at", precision: nil, null: false
@@ -225,17 +225,17 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.index ["species_id", "color_id"], name: "pet_types_species_color", unique: true
   end
 
-  create_table "pets", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "pets", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.string "name", limit: 20, null: false
     t.integer "pet_type_id", limit: 3, null: false
     t.index ["name"], name: "pets_name", unique: true
     t.index ["pet_type_id"], name: "pets_pet_type_id"
   end
 
-  create_table "species", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "species", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
   end
 
-  create_table "species_translations", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "species_translations", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "species_id"
     t.string "locale"
     t.string "name"
@@ -267,7 +267,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.index ["zone_id"], name: "idx_swf_assets_zone_id"
   end
 
-  create_table "users", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "users", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.string "name", limit: 20, null: false
     t.integer "auth_server_id", limit: 1, null: false
     t.integer "remote_id", null: false
@@ -278,9 +278,10 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.integer "owned_closet_hangers_visibility", default: 1, null: false
     t.integer "wanted_closet_hangers_visibility", default: 1, null: false
     t.integer "contact_neopets_connection_id"
+    t.timestamp "last_trade_activity_at"
   end
 
-  create_table "zone_translations", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "zone_translations", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "zone_id"
     t.string "locale"
     t.string "label"
@@ -291,7 +292,7 @@ ActiveRecord::Schema[7.1].define(version: 2023_11_11_234255) do
     t.index ["zone_id"], name: "index_zone_translations_on_zone_id"
   end
 
-  create_table "zones", id: :integer, charset: "latin1", force: :cascade do |t|
+  create_table "zones", id: :integer, charset: "latin1", collation: "latin1_swedish_ci", force: :cascade do |t|
     t.integer "depth"
     t.integer "type_id"
   end

test/test_helper.rb

@@ -0,0 +1,13 @@
+ENV["RAILS_ENV"] = "test"
+require File.expand_path('../../config/environment', __FILE__)
+require 'rails/test_help'
+
+class ActiveSupport::TestCase
+  # Setup all fixtures in test/fixtures/*.(yml|csv) for all tests in alphabetical order.
+  #
+  # Note: You'll currently still have to declare fixtures explicitly in integration tests
+  # -- they do not yet inherit this setting
+  fixtures :all
+
+  # Add more helper methods to be used by all tests here...
+end

test/trade_activity_test.rb

@@ -0,0 +1,232 @@
+require 'test_helper'
+
+class TradeActivityTest < ActiveSupport::TestCase
+	test "New user's last trade activity is nil" do
+		user = create_user
+		assert_nil user.last_trade_activity_at
+	end
+
+	test "Adding or removing items in a Trading list updates last trade activity" do
+		user = create_user
+
+		list = create_closet_list(
+			user: user, visibility: ClosetVisibility[:trading].id)
+		hanger = create_closet_hanger(user: user, list: list)
+		created_at = Time.now
+
+		assert_equal created_at, user.last_trade_activity_at
+
+		travel 1.day
+		hanger.destroy!
+
+		assert_equal created_at + 1.day, user.last_trade_activity_at
+	end
+
+	test "Adding or removing items in a Public list does not update last trade activity" do
+		user = create_user
+
+		list = create_closet_list(
+			user: user, visibility: ClosetVisibility[:public].id)
+		hanger = create_closet_hanger(user: user, list: list)
+
+		assert_nil user.last_trade_activity_at
+
+		travel 1.day
+		hanger.destroy!
+
+		assert_nil user.last_trade_activity_at
+	end
+
+	test "Adding or removing items in a Private list does not update last trade activity" do
+		user = create_user
+
+		list = create_closet_list(
+			user: user, visibility: ClosetVisibility[:private].id)
+		hanger = create_closet_hanger(user: user, list: list)
+
+		assert_nil user.last_trade_activity_at
+
+		travel 1.day
+		hanger.destroy!
+
+		assert_nil user.last_trade_activity_at
+	end
+
+	test "Adding or removing items in a Trading default-list updates last trade activity" do
+		user = create_user(
+			owned_closet_hangers_visibility: ClosetVisibility[:trading].id,
+			wanted_closet_hangers_visibility: ClosetVisibility[:private].id,
+		)
+
+		hanger = create_closet_hanger(user: user, owned: true)
+		created_at = Time.now
+
+		assert_equal created_at, user.last_trade_activity_at
+
+		travel 1.day
+		hanger.destroy!
+
+		assert_equal created_at + 1.day, user.last_trade_activity_at
+	end
+
+	test "Adding or removing items in a Public default-list does not update last trade activity" do
+		user = create_user(
+			owned_closet_hangers_visibility: ClosetVisibility[:public].id,
+			wanted_closet_hangers_visibility: ClosetVisibility[:private].id,
+		)
+
+		hanger = create_closet_hanger(user: user, owned: true)
+
+		assert_nil user.last_trade_activity_at
+
+		travel 1.day
+		hanger.destroy!
+
+		assert_nil user.last_trade_activity_at
+	end
+
+	test "Adding or removing items in a Private default-list does not update last trade activity" do
+		user = create_user(
+			owned_closet_hangers_visibility: ClosetVisibility[:private].id,
+			wanted_closet_hangers_visibility: ClosetVisibility[:private].id,
+		)
+
+		hanger = create_closet_hanger(user: user, owned: true)
+
+		assert_nil user.last_trade_activity_at
+
+		travel 1.day
+		hanger.destroy!
+
+		assert_nil user.last_trade_activity_at
+	end
+
+	test "Creating, editing, or deleting a Trading list updates last trade activity" do
+		user = create_user
+		list = create_closet_list(
+			user: user, visibility: ClosetVisibility[:trading].id
+		)
+		created_at = Time.now
+
+		assert_equal created_at, user.last_trade_activity_at
+
+		travel 1.day
+		list.update!(description: "Hello, world!")
+
+		assert_equal created_at + 1.day, user.last_trade_activity_at
+
+		travel 1.day
+		list.destroy!
+
+		assert_equal created_at + 2.day, user.last_trade_activity_at
+	end
+
+	test "Creating, editing, or deleting a Public list does not update last trade activity" do
+		user = create_user
+		list = create_closet_list(
+			user: user, visibility: ClosetVisibility[:public].id
+		)
+
+		assert_nil user.last_trade_activity_at
+
+		travel 1.day
+		list.update!(description: "Hello, world!")
+
+		assert_nil user.last_trade_activity_at
+
+		travel 1.day
+		list.destroy!
+
+		assert_nil user.last_trade_activity_at
+	end
+
+	test "Creating, editing, or deleting a Private list does not update last trade activity" do
+		user = create_user
+		list = create_closet_list(
+			user: user, visibility: ClosetVisibility[:private].id
+		)
+
+		assert_nil user.last_trade_activity_at
+
+		travel 1.day
+		list.update!(description: "Hello, world!")
+
+		assert_nil user.last_trade_activity_at
+
+		travel 1.day
+		list.destroy!
+
+		assert_nil user.last_trade_activity_at
+	end
+
+	test "Updating default-list visibility to Trading updates last trade activity" do
+		user = create_user(
+			owned_closet_hangers_visibility: ClosetVisibility[:private].id,
+		)
+
+		assert_nil user.last_trade_activity_at
+
+		user.update!(
+			owned_closet_hangers_visibility: ClosetVisibility[:trading].id,
+		)
+
+		assert_equal Time.now, user.last_trade_activity_at
+	end
+
+	test "Updating default-list visibility to Public does not update last trade activity" do
+		user = create_user(
+			owned_closet_hangers_visibility: ClosetVisibility[:private].id,
+		)
+
+		assert_nil user.last_trade_activity_at
+
+		user.update!(
+			owned_closet_hangers_visibility: ClosetVisibility[:public].id,
+		)
+
+		assert_nil user.last_trade_activity_at
+	end
+
+	test "Updating default-list visibility to Private does not update last trade activity" do
+		user = create_user(
+			owned_closet_hangers_visibility: ClosetVisibility[:public].id,
+		)
+
+		assert_nil user.last_trade_activity_at
+
+		user.update!(
+			owned_closet_hangers_visibility: ClosetVisibility[:private].id,
+		)
+
+		assert_nil user.last_trade_activity_at
+	end
+
+	setup do
+		freeze_time # to compare timestamps accurately
+
+		Item.create!(
+			thumbnail_url: "https://images.neopets.com/foo.png",
+			zones_restrict: "",
+			price: 123,
+		)
+	end
+
+	private
+
+	def create_user(**args)
+		auth_user = AuthUser.create!(
+			name: 'test', email: 'test@example.com', password: 'test123!'
+		)
+		auth_user.user.update!(**args) unless args.empty?
+		auth_user.user
+	end
+
+	def create_closet_list(**args)
+		num = ClosetList.count + 1
+		ClosetList.create!(name: "Test List #{num}", hangers_owned: true, **args)
+	end
+
+	def create_closet_hanger(**args)
+		ClosetHanger.create!(item: Item.first, quantity: 1, **args)
+	end
+end