Hi there! Thank you for your detailed feedback.
I would like to first point out that the past rates do not get set to 0. Past rates are preserved, but if you’re experiencing any issues, feel free to contact us at support@clockify.me so our team can investigate the issue further.
If you would like to change the past rate of a time entry, you can do that by making the entry non-billalbe and then billable again. It will then override it and pick up the new rate because the billability is updated.
This change is actually made so it wouldn’t affect past reporting (this is exactly why the past rate is preserved and not changed to a new rate or set to 0). Before this feature, when you updated the rate all past entries got that new rate.
Again, if you’re having any issues, don’t hesitate to contact our support team.