quick end-to-end test

And some bug fixes too!

e2e.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+BASE_URL="http://localhost:8080/api"
+
+echo "=== E2E Pseudo Test ==="
+echo ""
+
+echo "POST /api/orderupdate - Place SELL order"
+curl -s -X POST "$BASE_URL/orderupdate" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "delivery_start_time": "2024-01-15T10:00:00",
+    "delivery_end_time": "2024-01-15T10:15:00",
+    "order_side": "SELL",
+    "quantity": 10,
+    "price": 50.00
+  }' | jq .
+echo ""
+
+echo "POST /api/orderupdate - Place matching BUY order"
+curl -s -X POST "$BASE_URL/orderupdate" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "delivery_start_time": "2024-01-15T10:00:00",
+    "delivery_end_time": "2024-01-15T10:15:00",
+    "order_side": "BUY",
+    "quantity": 5,
+    "price": 50.00
+  }' | jq .
+echo ""
+
+echo "POST /api/orderupdate - Place another SELL order"
+curl -s -X POST "$BASE_URL/orderupdate" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "delivery_start_time": "2024-01-15T10:15:00",
+    "delivery_end_time": "2024-01-15T10:30:00",
+    "order_side": "SELL",
+    "quantity": 20,
+    "price": 45.00
+  }' | jq .
+echo ""
+
+echo "GET /api/market/overview - Get market overview"
+curl -s -X GET "$BASE_URL/market/overview" | jq .
+echo ""
+
+echo "GET /api/purchases/average - Get average purchase price"
+curl -s -X GET "$BASE_URL/purchases/average" | jq .
+echo ""
+
+echo "=== Done ==="