Tighten race result ingestion ordering

internal/models/sort.go

@@ -0,0 +1,20 @@
+package models
+
+import "sort"
+
+// SortSessionResults orders results by classified position, with position 0 (DNF/DNS) last.
+func SortSessionResults(results []SessionResult) {
+	sort.Slice(results, func(i, j int) bool {
+		pi, pj := results[i].Position, results[j].Position
+		if pi == 0 {
+			pi = 9999
+		}
+		if pj == 0 {
+			pj = 9999
+		}
+		if pi != pj {
+			return pi < pj
+		}
+		return results[i].DriverNumber < results[j].DriverNumber
+	})
+}

internal/models/sort_test.go

@@ -0,0 +1,21 @@
+package models
+
+import "testing"
+
+func TestSortSessionResults(t *testing.T) {
+	results := []SessionResult{
+		{DriverNumber: 55, Position: 0, DNF: true},
+		{DriverNumber: 10, Position: 0, DNS: true},
+		{DriverNumber: 1, Position: 1},
+		{DriverNumber: 44, Position: 2},
+	}
+
+	SortSessionResults(results)
+
+	want := []int{1, 44, 10, 55}
+	for i, dn := range want {
+		if results[i].DriverNumber != dn {
+			t.Fatalf("results[%d].DriverNumber = %d, want %d", i, results[i].DriverNumber, dn)
+		}
+	}
+}