Keep one reading when two paths are measured at one moment, rather than failing the machine's record (hq issue 368 review)

internal/inventory/data_test.go

@@ -172,3 +172,22 @@ func TestThePeakIsReadAtTheItemsPathOnly(t *testing.T) {
 		t.Fatalf("back at the first path the peak is %v (%v), want 94700000", peaks, err)
 	}
 }
+
+// Two measurements at the same moment at two paths keep one reading and fail nothing: the second
+// would otherwise break the reading's key and lose the machine's whole record (issue 368 review).
+func TestTwoPathsAtOneMomentFailNothing(t *testing.T) {
+	inv := fresh(t)
+	ctx := t.Context()
+	now := time.Date(2026, 10, 10, 0, 0, 0, 0, time.UTC)
+	declared := []DeclaredData{{Module: "claude-code", Item: "agent-home", Class: "valuable", Owned: true}}
+	for _, path := range []string{"/home/operator/.claude", "/home/agent/.claude"} {
+		if _, err := inv.RecordData(ctx, "novox", declared, map[string]map[string]Measurement{"claude-code": {
+			"agent-home": {Path: path, Size: size(100), MeasuredAt: at(now)}}}, "", now); err != nil {
+			t.Fatalf("a measurement at %s failed: %v", path, err)
+		}
+	}
+	r, err := inv.DataOf(ctx, "novox", "claude-code", "agent-home")
+	if err != nil || r.Path != "/home/agent/.claude" {
+		t.Fatalf("%+v, %v", r, err)
+	}
+}