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+
+These cleanups are primarily intended to fix bogus 'None' datetime links to
+wayback for files that are actually in petabox (archive.org not
+web.archive.org). These URLs were created accidentally during fatcat
+boostrapping; there are about 300k such file enties to fix.
+
+Will also update archive.org link reltype to 'archive' (instead of
+'repository'), which is the new preferred style.
+
+Generated the set of files to update like:
+
+    zcat file_export.2019-07-07.json.gz | rg 'web.archive.org/web/None' | gzip > file_export.2019-07-07.None.json.gz
+
+    zcat /srv/fatcat/datasets/file_export.2019-07-07.None.json.gz | wc -l
+    304308
+
+## QA
+
+Running at git rev:
+
+    984a1b157990f42f8c57815f4b3c00f6455a114f
+
+Created a new 'cleanup-bot' account and credentials. Put token in local env.
+
+Ran with a couple hundred entities first; edits look good.
+
+    zcat /srv/fatcat/datasets/file_export.2019-07-07.None.json.gz | head -n200 | ./fatcat_cleanup.py files -
+
+Then the full command, with batchsize=100:
+
+    time zcat /srv/fatcat/datasets/file_export.2019-07-07.None.json.gz | pv -l | ./fatcat_cleanup.py --batch-size 100 files -
+
+Should finish in a couple hours.
+
+    304k 1:05:19 [77.6 /s]
+
+    Counter({'cleaned': 304308, 'lines': 304308, 'updated': 297308, 'skip-revision': 7000})
+
+    real    65m20.613s
+    user    20m40.828s
+    sys     0m34.492s
+
+## Production
+
+Again ran with a couple hundred entities first; edits look good.
+
+    zcat /srv/fatcat/datasets/file_export.2019-07-07.None.json.gz | head -n200 | ./fatcat_cleanup.py files -
+
+Then the full command, with batchsize=100:
+
+    time zcat /srv/fatcat/datasets/file_export.2019-07-07.None.json.gz | pv -l | ./fatcat_cleanup.py --batch-size 100 files -
+    [...]
+    304k 1:03:10 [80.3 /s]
+    Counter({'cleaned': 304308, 'lines': 304308, 'updated': 304107, 'skip-revision': 201})
+
+    real    63m11.631s
+    user    21m8.504s
+    sys     0m31.888s
+