Merge branch 'develop' into feat/read-only-token

app/models/account.rb

@@ -109,6 +109,7 @@ class Account < ApplicationRecord
 
   before_validation :validate_limit_keys
   after_create_commit :notify_creation
+  after_update_commit :clear_unread_conversation_counts_cache, if: :saved_change_to_feature_conversation_unread_counts?
   after_destroy :remove_account_sequences
 
   def agents

app/models/article.rb

@@ -55,10 +55,14 @@ class Article < ApplicationRecord
   before_validation :ensure_article_slug
   before_validation :ensure_locale_in_article
 
+  # Slugs that collide with help center routes (e.g. /hc/:slug/:locale/search)
+  RESERVED_SLUGS = %w[search articles categories].freeze
+
   validates :account_id, presence: true
   validates :author_id, presence: true
   validates :title, presence: true
   validates :content, presence: true, if: :published?
+  validates :slug, exclusion: { in: RESERVED_SLUGS }
 
   # ensuring that the position is always set correctly
   before_create :add_position_to_article