My diary looks empty on this device. How can I find my history?

An empty diary does not tell us whether the history was deleted. First check that you are in the same Calsa account, using the same sign-in method as before. Signing in with Apple can show a private relay email.

Check the selected date. If you still have your old device, keep it signed in and check whether any entries are waiting to sync. Those entries may still exist only on that device.

Do not create another account, delete the app or buy a second subscription to recover the diary. If the account and date match but history is missing, contact support with the devices involved and whether the old device shows unsent entries.