prov files keep or cleanup old prov files

[valentinedwv]

So for prov do we want to maintain the old prov file?

Also, the original URL is in the x-meta, should the SHA file be in there?

Also the prov shows milled as the reference, is this correct?
{
"@id": "urn::milled:geocodes_demo_datasets:61af1c32ec3cef177fe6169132c3c9c4de62f284",
"@type": "prov:Entity",
"prov:value": "61af1c32ec3cef177fe6169132c3c9c4de62f284.jsonld"
},