fix: SQL boolean and nullable value comparison

lib/tx.js

@@ -74,7 +74,8 @@ function customerHistory (customerId, thresholdDays) {
     FROM cash_out_txs txOut
     WHERE txOut.customer_id = $1
     AND txOut.created > now() - interval $2
-    AND (timedout = true OR error_code != 'operatorCancel')
+    AND timedout IS false
+    AND error_code IS DISTINCT FROM 'operatorCancel'
     ORDER BY created;`
 
   const days = _.isNil(thresholdDays) ? 0 : thresholdDays