The date format of the expires field is not stores consistently in the database.
I've came across this issue where my custom notifications are removed on cron, despite not having an expiration value.
Update the format of the default value for the expires field, since the cron hook already verifies for a datetime format.
Verify the cron doesn't accidentally remove notifications that do not have an expiration date
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2.0
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Appearently, I've added this issue too soon.
In my custom hooks to add the notifications, I'm giving a default expires value set to a year.
This was in the wrong format, causing my notifications to be removed on every cron.
Module works as expected, but might want to add it in documentation somewhere.