fix: replace max(uuid) with array_agg for preseem sync logs

- PostgreSQL's max() function doesn't work on UUID types
- Use array_agg to get first ID from grouped results instead
- Matches pattern already used for status field
- Fixes crash on /activity page when preseem sync logs exist

lib/towerops/activity_feed.ex

@@ -301,7 +301,7 @@ defmodule Towerops.ActivityFeed do
       from(sl in SyncLog,
         where: sl.organization_id == ^org_id,
         select: %{
-          id: max(sl.id),
+          id: fragment("(array_agg(? ORDER BY ? DESC))[1]", sl.id, sl.inserted_at),
           timestamp: fragment("date_trunc('minute', ?)", sl.inserted_at),
           status: fragment("(array_agg(? ORDER BY ? DESC))[1]", sl.status, sl.inserted_at),
           records_synced: sum(sl.records_synced),