cleanups: springer 'page-one' sample PDFs

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+
+In the past we have crawled and imported many PDF files from Springer, which in
+fact are only first-page samples of articles, not the entire fulltext work itself.
+
+The original domain these are served from is:
+
+- `page-one.live.cf.public.springer.com`
+
+The cleanup for these is to update the files with:
+
+1. set the `content_scope` field to `sample`, and remove any `release_ids`
+2. in downstream contexts, don't treat `content_scope=sample` as a complete entity
+
+An alternative would be to just delete these files. But this would likely
+result in them being re-imported in the future.
+
+We might also want to retain the `release_ids` linkage between files and
+releases. The current semantics of file/release are that the file represents a
+valid preservation copy of the release though, and that is not the case here.
+In this specific case the relationship is partially preserved in edit history,
+and could be resurected programatically if needed.
+
+## Existing Files with URL
+
+The easy case to detect is when these files are in fatcat with the original
+URL. How many files fall in that cateogry?
+
+    zcat file_export.json.gz \
+        | rg '//page-one.live.cf.public.springer.com/' \
+        | pv -l \
+        | pigz \
+        > files_pageone.json.gz
+    # 24.4k 0:10:03 [40.5 /s]
+
+## Existing Files without URL
+
+After a partial cleanup, export, and re-load of the `release_file` table in
+sandcrawler-db, we could do a join between the `fatcat_file` and the `cdx`
+table to identify PDFs which have ever been crawled from
+`page-one.live.cf.public.springer.com` and have an entity in fatcat.
+
+
+## QA
+
+    export FATCAT_API_HOST=https://api.qa.fatcat.wiki
+    export FATCAT_AUTH_WORKER_CLEANUP=[...]
+    export FATCAT_API_AUTH_TOKEN=$FATCAT_AUTH_WORKER_CLEANUP
+
+    fatcat-cli --version
+    fatcat-cli 0.1.6
+
+
+    fatcat-cli status
+         API Version: 0.5.0 (local)
+            API host: https://api.qa.fatcat.wiki [successfully connected]
+      Last changelog: 5326137
+      API auth token: [configured]
+             Account: cleanup-bot [bot] [admin] [active]
+                      editor_vvnmtzskhngxnicockn4iavyxq
+
+    zcat /srv/fatcat/datasets/files_pageone.json.gz \
+        | jq '"file_" + .ident' -r \
+        | head -n100 \
+        | parallel -j1 fatcat-cli get {} --json \
+        | jq . -c \
+        | rg -v '"content_scope"' \
+        | rg 'page-one.live.cf.public.springer.com' \
+        | pv -l \
+        | fatcat-cli batch update file release_ids= content_scope=sample --description 'Un-link and mark Springer "page-one" preview PDF files as content_scope=sample' --auto-accept
+
+Looks good!
+
+
+## Prod
+
+See bulk edits log.