[FEATURE] Support human-readable dates for database rollbacks

[Markus00000]

Is your feature request related to a problem? Please describe.

--rollback-database uses Unix timestamps, which can be inconvenient to obtain and are hard to comprehend for humans.

Describe the solution you'd like.

--rollback-database could support human-readable dates (e.g. in ISO format):

>>> import datetime
>>> d = datetime.datetime.fromisoformat('2024-04-23T14:26:40+02:00')
>>> d.replace(tzinfo=datetime.timezone.utc).timestamp()

Or using dateutil (examples):

>>> from dateutil import parser
>>> d = parser.parse('2024-04-23T14:39:38 CEST')
>>> d.replace(tzinfo=datetime.timezone.utc).timestamp()

dateutil accepts many inputs and is already installed as a dependency on my system for several applications. However, I am skeptical that an additional dependency is warranted considering how rarely most users will roll back their database. I would be happy with just datetime.datetime.fromisoformat.

In short:

--rollback-database ISO_DATE
--rollback-database TIMESTAMP

[mborsetti]

Makes sense, thanks for taking the time to make the suggestion!

Can structure it so that dateutil is used unless it's not found on the system, in which case it it falls back to using datetime (so there's no formal dependency on dateutil.