Allow moving tickets between projects with P.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/ticket/jsontimestore_test.go

@@ -91,3 +91,38 @@ func TestJSONTimeStoreDeleteByProject(t *testing.T) {
 		t.Fatalf("after DeleteByProject: %v %+v", err, list)
 	}
 }
+
+func TestJSONTimeStoreRetargetTicket(t *testing.T) {
+	dir := t.TempDir()
+	store := ticket.NewJSONTimeStore(dir)
+
+	if _, err := store.Create(ticket.TimeEntry{
+		TicketID: "t1", ProjectID: "old", Duration: time.Hour, Source: ticket.SourceManual,
+	}); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := store.Create(ticket.TimeEntry{
+		TicketID: "t2", ProjectID: "old", Duration: time.Minute, Source: ticket.SourceManual,
+	}); err != nil {
+		t.Fatal(err)
+	}
+	if err := store.RetargetTicket("t1", "new"); err != nil {
+		t.Fatal(err)
+	}
+	list, err := store.List()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, e := range list {
+		switch e.TicketID {
+		case "t1":
+			if e.ProjectID != "new" {
+				t.Fatalf("t1 project=%q", e.ProjectID)
+			}
+		case "t2":
+			if e.ProjectID != "old" {
+				t.Fatalf("t2 project=%q", e.ProjectID)
+			}
+		}
+	}
+}