improve testing

e2e.sh

@@ -29,13 +29,13 @@ curl -s -X POST "$BASE_URL/orderupdate" \
   }' | jq .
 echo ""
 
-echo "POST /api/orderupdate - Place another SELL order"
+echo "POST /api/orderupdate - Place another BUY order"
 curl -s -X POST "$BASE_URL/orderupdate" \
   -H "Content-Type: application/json" \
   -d '{
     "delivery_start_time": "2024-01-15T10:15:00",
     "delivery_end_time": "2024-01-15T10:30:00",
-    "order_side": "SELL",
+    "order_side": "BUY",
     "quantity": 20,
     "price": 45.00
   }' | jq .