DEV: Drop user_id from chat_mentions (#25022)

This column is ignored since 62f423d

plugins/chat/app/models/chat/mention.rb

@@ -19,7 +19,6 @@ end
 #
 #  id              :bigint           not null, primary key
 #  chat_message_id :integer          not null
-#  user_id         :integer
 #  target_id       :integer
 #  type            :integer          not null
 #  created_at      :datetime         not null

plugins/chat/db/post_migrate/20240410130000_drop_user_id_from_chat_mentions.rb

@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class DropUserIdFromChatMentions < ActiveRecord::Migration[7.0]
+  DROPPED_COLUMNS ||= { chat_mentions: %i[user_id] }
+
+  def up
+    DROPPED_COLUMNS.each { |table, columns| Migration::ColumnDropper.execute_drop(table, columns) }
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end