--- a/src/lib/User.luan	Wed Nov 06 23:05:45 2024 -0700
+++ b/src/lib/User.luan	Sat Nov 09 19:17:21 2024 -0700
@@ -17,6 +17,7 @@
 local Db = require "site:/lib/Db.luan"
 local run_in_transaction = Db.run_in_transaction or error()
 local Chat = require "site:/lib/Chat.luan"
+local chat_search = Chat.search or error()
 local Logging = require "luan:logging/Logging.luan"
 local logger = Logging.logger "User"
 
@@ -52,7 +53,7 @@
 	function user.delete()
 		run_in_transaction( function()
 			local id = user.id
-			local chats = Chat.search("chat_user_ids:"..id)
+			local chats = chat_search("chat_user_ids:"..id)
 			for _, chat in ipairs(chats) do
 				chat.delete()
 			end
@@ -68,6 +69,16 @@
 		Http.request.cookies.password = user.password or error()
 	end
 
+	function user.last_update()
+		local chats = chat_search( "chat_user_ids:"..user.id, "chat_updated desc", 1 )
+		local n = #chats
+		if n == 0 then
+			return 0
+		elseif n == 1 then
+			return chats[1].updated
+		else error() end
+	end
+
 	return user
 end