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Now that audit is implemented, we can remove the
previous
field from theAsset
model. This field was used to store the previous version of an asset, but it is no longer needed since we can track changes using the audit log.This also unblocks garbage collection, which will follow this PR.
(GC docs -
https:/dandi/dandi-archive/blob/master/doc/design/garbage-collection-1.md
https:/dandi/dandi-archive/blob/master/doc/design/garbage-collection-uploads-asset-blobs.md
)
Keeping this as draft until it's ready to merge, since we'll want to perform a DB backup before doing so.