feat: invalidate cache on avatar update

app/controllers/api/v1/profiles_controller.rb

@@ -13,11 +13,17 @@ class Api::V1::ProfilesController < Api::BaseController
     @user.assign_attributes(profile_params)
     @user.custom_attributes.merge!(custom_attributes_params)
     @user.save!
+
+    # Profile updates can change cached agent fields, including avatar-backed thumbnails.
+    @user.invalidate_avatar_cache
   end
 
   def avatar
     @user.avatar.attachment.destroy! if @user.avatar.attached?
     @user.reload
+
+    # Agent thumbnails are cached separately, and avatar attachment deletes do not dirty user columns.
+    @user.invalidate_avatar_cache
   end
 
   def auto_offline

app/jobs/avatar/avatar_from_url_job.rb

@@ -52,6 +52,9 @@ class Avatar::AvatarFromUrlJob < ApplicationJob
       filename: avatar_file.original_filename,
       content_type: avatar_file.content_type
     )
+
+    # Agent thumbnails are cached separately, and avatar attachments do not dirty user columns.
+    avatarable.invalidate_avatar_cache if avatarable.respond_to?(:invalidate_avatar_cache)
   end
 
   def log_http_error(avatar_url, error)

app/models/user.rb

@@ -216,6 +216,10 @@ class User < ApplicationRecord
     super
   end
 
+  def invalidate_avatar_cache
+    bump_account_user_cache_keys
+  end
+
   private
 
   def remove_macros