Some optimisations.

app/Helpers/Report/ReportQueryInterface.php

@@ -86,6 +86,20 @@ interface ReportQueryInterface
      */
     public function incomeInPeriod(Carbon $start, Carbon $end, $includeShared = false);
 
+    /**
+     * This method returns all "expense" journals in a certain period, which are both transfers to a shared account
+     * and "ordinary" withdrawals. The query used is almost equal to ReportQueryInterface::journalsByRevenueAccount but it does
+     * not group and returns different fields.
+     *
+     * @param Carbon $start
+     * @param Carbon $end
+     * @param bool   $includeShared
+     *
+     * @return Collection
+     *
+     */
+    public function expenseInPeriod(Carbon $start, Carbon $end, $includeShared = false);
+
     /**
      * Gets a list of expenses grouped by the budget they were filed under.
      *