Start reading cancel read: move logic to backend

internal/apitest/put_userbook_test.go

@@ -153,6 +153,18 @@ func TestPutStartReadUserBooks_UnsetWantReadOk(t *testing.T) {
 	assert.Equal(t, false, book.WantRead)
 }
 
+func TestPutStartReadUserBooks_UnsetReadOk(t *testing.T) {
+	payload :=
+		`{
+	  "startDate": "2025-12-20"
+	}`
+	bookId := "13"
+	testPutUserBooks(t, payload, bookId, http.StatusOK)
+	book := testGetBook(t, bookId, http.StatusOK)
+	assert.Equal(t, "2025-12-20", book.StartReadDate)
+	assert.Equal(t, false, book.Read)
+}
+
 func TestPutStartReadUserBooks_Unset(t *testing.T) {
 	payload :=
 		`{

internal/routes/userbookputupdate.go

@@ -63,6 +63,7 @@ func PutUserBookHandler(ac appcontext.AppContext) {
 			return
 		}
 		if d != nil {
+			userbook.Read = false
 			userbook.WantRead = false
 		}
 		userbook.StartReadDate = d