daedalus: Cannot start 4.5.0 - DbLocked

EDIT: Here is the workaround for people finding this on Google:

As a workaround, you can do the following (every time you start Daedalus):

Open the file %appdata%\Daedalus Mainnet\config.json in an editor. (Maybe create a backup first.) Find the line that contains mainnet-PREVIOUS-CARDANO-PID and delete it. If this was the last line in the file before the final }, delete the comma at the end of the previous line as well. Then start Daedalus and it will work one time.

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I got an update from 4.4.1 to 4.5.0 today.

After the update, I can no longer start Daedalus. It goes in a cycle of “Connecting to network”, “Stopping cardano node”, “Cardano node crashed”.

node.log shows that it keeps crashing with the DbLocked error:

DbLocked "C:\\Users\\david\\AppData\\Roaming\\Daedalus Mainnet\\chain\\lock"

cardano-node: The db is used by another process. File "C:\Users\david\AppData\Roaming\Daedalus Mainnet\chain\lock" is locked

At this point, there are always two instances of cardano-node.exe running - one using 4 GB of RAM, and one that runs, crashed, gets restarted, etc.

I already tried several times to close Daedalus, make sure no cardano-node.exe process runs, deleted the lockfile is existing, etc. - but again, when I start Daedalus, it starts again two instances, with the second one obviously failing.

What can I do to fix this?