Add date filtering to backend

postgres/queries/transactions.sql

@@ -69,4 +69,5 @@ FROM display_transactions AS transactions
 WHERE (NOT @filter_category::boolean OR transactions.category_id = @category_id) 
 AND (NOT @filter_account::boolean OR transactions.account_id = @account_id) 
 AND (NOT @filter_payee::boolean OR transactions.payee_id = @payee_id)
+AND transactions.date BETWEEN @from_date AND @to_date
 AND transactions.budget_id = @budget_id;