requirements-swh.txt already declares the swh.core[db] dependency which
transitively pulls it.

Related to T2746

The previous code would nullify all non-null branches, and try to create a
SnapshotBranch out of null branches.

As this happens for about 50 revisions in the archive.

This module's use of write_addition predated the introduction of reliable
writing in swh.journal; Since this introduction, the backfiller has been
flushing the kafka writer after writing each single object, leading to a 3x
measured slowdown on backfilling contents.

as this happens quite often and isn't an error.

migrate_extrinsic_metadata: add support for guessing the origin of more PyPI packages from filenames.

Because it makes a lot of get requests and doesn't handle failures,
it crashed often.

The metadata migration script kept crashing otherwise.

The next version of swh-journal will remove the default value.

It complicates the signature and the code, and we don't have any use
for it currently.

1. rename branch_info to last_branch
2. exclude the last_branch from 'branches', so that:
   a) it never needs to contain a None value, so we don't need a cast
   b) no need for slicing

Consistently with the new name for this attribute in swh.model 0.7.2.

For consistency with swh.model v0.7.2, to prepare for the addition of
an (intrinsic) id field to RawExtrinsicMetadata objects.

For consistency with swh.model v0.7.2, to prepare for the addition of
an (intrinsic) id field to RawExtrinsicMetadata objects.

Related to T2734

To match the new behavior of package loaders.

The old attribute was deprecated in swh.model 0.7.2

swh.model.model.ModelObject.compute_hash was changed to a method instead of a
staticmethod.

migrate_extrinsic_metadata: Make pypi_origin_from_filename fix project names when possible using PyPI's API.

Instead of bloating handle_row, which is already way too long.

migrate_extrinsic_metadata: add support for guessing the origin of more PyPI packages from filenames.

It now supports all pypi revisions with an id starting with an hex digit
from 0 to 5.

This is actually what starts the server, so it sounds more reasonable to test
that part.

This also drops the type parameter from load_and_check_config which is never
used.

A future version of swh-journal will add a mandatory argument to JournalWriter,
whic get_journal_writer sets by default.

migrate_extrinsic_metadata: add support for the new deposit metadata formats introduced in late september.

* https://forge.softwareheritage.org/D4065
* https://forge.softwareheritage.org/D4105

Notably, `get_objstorage`'s `args` has been deprecated as of swh.objstorage
0.2.2.

This makes the backfiller configuration compatible with all other modules.

This allows more settings than the previous hardcoded three, e.g. the
`privileged` flag to backfill a journal containing anonymous topics.

Otherwise, Ctrl-C is ignored if pressed while sending a request.

migrate_extrinsic_metadata: add support for guessing the origin of more PyPI packages from filenames.

It now supports all pypi revisions with an id starting with 0, 1, or 2.