fix: temporarily disable last message query in member_list

PluralKit.Core/Database/Views/ListedMember.cs

@@ -6,7 +6,7 @@ namespace PluralKit.Core
     // TODO: is inheritance here correct?
     public class ListedMember: PKMember
     {
-        public ulong? LastMessage { get; }
+        // public ulong? LastMessage { get; }
         public Instant? LastSwitchTime { get; }
 
         public AnnualDate? AnnualBirthday =>

PluralKit.Core/Database/Views/views.sql

@@ -30,7 +30,7 @@ create view member_list as
 select members.*,
        -- Find last message ID
        -- max(mid) does full table scan, order by/limit uses index (dunno why, but it works!)
-       (select mid from messages where messages.member = members.id order by mid desc nulls last limit 1) as last_message,
+    --    (select mid from messages where messages.member = members.id order by mid desc nulls last limit 1) as last_message,
        
        -- Find last switch timestamp
        (