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Add deposit info to objects added to swh-storage from metadata-only deposits

vlorentz requested to merge generated-differential-D5239-source into generated-differential-D5239-target

Deposits with code objects are loaded as their own origin, so we can look them up in the deposit database from their metadata (which hold the origin as a context).

This is not true for metadata-only deposits, because we don't create an origin for them; so we need to store this information somewhere. The naive solution would be to insert them in the Atom entry provided by the client, but it means altering a document before we archive it, which is bad.

This commit makes the deposit server write a "metametadata" object (ie. a metadata object with an other metadata object as target) the metadata storage. This metametadata contains information on the deposit itself: id, client, and collection.

Depends on swh-model!168 (closed) and !221 (closed)

Resolves #2779 (closed)

Migrated from D5239 (view on Phabricator)

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