notes on file_meta partial cleanup

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+Another partial batch of pure `file_meta` updates to file entities. These came
+from re-attempting ingest by URL of existing file entities.
+
+Not all ran as expected, partially because of GROBID issues, and partially
+because we had alternate captures for the same URLs.
+
+Still, about half the attempts worked, so we are going to update a fraction of
+the ~520k outstanding file entities with partial metadata (eg, missing sha256).
+
+See cleanups `file_meta` document for prep and QA testing notes.
+
+
+## Production Commands
+
+    git log | head -n1
+    commit 75bde4ad3970e8e63b04009cfd16ed4b9a924ce7
+
+    export export FATCAT_AUTH_API_TOKEN=[...]  # sandcrawler-bot
+
+Start with a small sample:
+
+    cat /srv/fatcat/datasets/files_missing_sha256.file_meta.uniq.sample.json \
+        | ./fatcat_import.py --editgroup-description-override 'backfill of full file-level metadata for early-imported papers' file-meta -
+    # Counter({'total': 100, 'skip-existing-complete': 45, 'update': 43, 'skip-no-match': 12, 'skip': 0, 'insert': 0, 'exists': 0})
+
+Then run in parallel with full batch:
+
+    cat /srv/fatcat/datasets/files_missing_sha256.file_meta.uniq.json \
+        | parallel -j8 --round-robin --pipe -q ./fatcat_import.py --editgroup-description-override 'backfill of full file-level metadata for early-imported papers' file-meta -
+    # Counter({'total': 41846, 'update': 19737, 'skip-existing-complete': 18788, 'skip-no-match': 3321, 'skip': 0, 'insert': 0, 'exists': 0})
+    # Counter({'total': 41522, 'update': 19678, 'skip-existing-complete': 18607, 'skip-no-match': 3237, 'skip': 0, 'insert': 0, 'exists': 0})
+    # Counter({'total': 41537, 'update': 20517, 'skip-existing-complete': 17895, 'skip-no-match': 3125, 'skip': 0, 'insert': 0, 'exists': 0})
+    # Counter({'total': 41529, 'update': 19684, 'skip-existing-complete': 18501, 'skip-no-match': 3344, 'skip': 0, 'insert': 0, 'exists': 0})
+    # Counter({'total': 41530, 'update': 19595, 'skip-existing-complete': 18637, 'skip-no-match': 3298, 'skip': 0, 'insert': 0, 'exists': 0})
+    # Counter({'total': 41542, 'update': 21359, 'skip-existing-complete': 17033, 'skip-no-match': 3150, 'skip': 0, 'insert': 0, 'exists': 0})
+    # Counter({'total': 41534, 'update': 19758, 'skip-existing-complete': 18516, 'skip-no-match': 3260, 'skip': 0, 'insert': 0, 'exists': 0})
+    # Counter({'total': 41537, 'update': 20507, 'skip-existing-complete': 15543, 'skip-no-match': 5487, 'skip': 0, 'insert': 0, 'exists': 0})
+
+Import ran pretty fast! Updated about 160k file entities. More like 1/3 than
+1/2 of the 520k that were missing SHA-256.