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serializers: Ensure backward compatibility for string serialized timedeltas

Antoine Lambert requested to merge generated-differential-D559-source into generated-differential-D559-target

datetime.timedelta serialization/deserialization has recently changed in swh-core (67dcf30e).

However, the following snippet now ends up with an error:

import sys
from swh.scheduler import get_scheduler
scheduler = get_scheduler('remote', {'url': 'http://saatchi.internal.softwareheritage.org:5008/'})
scheduler.get_tasks([10270265])

Indeed, the arguments for the task 10270265 are stored in the softwareheritage-scheduler database but those with datetime.timedelta type were serialized using the old method. So their deserialization fail unless some backward compatible method is used.

Related swh-web#1281 (closed)

Migrated from D559 (view on Phabricator)

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