Add routine that caches account balances. Add it to the /flush routine as well.

app/Models/AccountBalance.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace FireflyIII\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class AccountBalance extends Model
+{
+    protected $fillable = ['account_id', 'transaction_currency_id', 'balance'];
+    use HasFactory;
+}