fix(bot): add callback to update message count after proxying

also re-add -with-last-message flag :D

PluralKit.Core/Database/Migrations/32.sql

@@ -0,0 +1,6 @@
+-- database version 32
+-- re-add last message timestamp to members
+
+alter table members add column last_message_timestamp timestamp;
+
+update info set schema_version = 32;

PluralKit.Core/Database/Repository/ModelRepository.Member.cs

@@ -97,4 +97,16 @@ public partial class ModelRepository
             new { member = id, account = userId }
         );
     }
+
+    public async Task UpdateMemberForSentMessage(MemberId id)
+    {
+        var query = new Query("members")
+            .AsUpdate(new {
+                last_message_timestamp = new UnsafeLiteral("now()"),
+                message_count = new UnsafeLiteral("message_count + 1")
+            })
+            .Where("id", id);
+
+        await _db.ExecuteQuery(query);
+    }
 }

PluralKit.Core/Database/Utils/DatabaseMigrator.cs

@@ -9,7 +9,7 @@ namespace PluralKit.Core;
 internal class DatabaseMigrator
 {
     private const string RootPath = "PluralKit.Core.Database"; // "resource path" root for SQL files
-    private const int TargetSchemaVersion = 31;
+    private const int TargetSchemaVersion = 32;
     private readonly ILogger _logger;
 
     public DatabaseMigrator(ILogger logger)

PluralKit.Core/Database/Views/ListedMember.cs

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

PluralKit.Core/Database/Views/views.sql

@@ -9,10 +9,6 @@ from systems
 
 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,
-
        -- Find last switch timestamp
        (
            select max(switches.timestamp)