file_meta import notes

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+Approximately 18 million file entities have only partial file metadata. All
+have a sha1 (hex), but many are missing file size, md5, mimetype, etc.
+
+At least a few thousand of these are additionally *not* `application/pdf`
+mimetype based on actually retrieving the file and sniffing the file type.
+These are added earlier to the catalog likely based on CDX mimetype, which is
+server-reported and can be incorrect.
+
+## QA Testing
+
+    ./fatcat_import.py --editgroup-description-override "backfill of full file-level metadata for early-imported papers" file-meta -
+    => Counter({'total': 1000, 'update': 1000, 'skip': 0, 'insert': 0, 'exists': 0})
+
+    # Identical command, verifying that don't double-insert:
+    => Counter({'total': 1000, 'skip-existing-complete': 1000, 'skip': 0, 'insert': 0, 'update': 0, 'exists': 0})
+
+Two additional file-level cleanups should probably be done at the same time:
+
+Partial wayback URL timestamps, for cases where we have the full timestamped URL. Eg:
+
+    https://web.archive.org/web/2017/http://www.geoamazonia.net/index.php/revista/article/download/51/pdf_38
+    https://web.archive.org/web/20170922010835/http://www.geoamazonia.net/index.php/revista/article/download/51/pdf_38
+    https://qa.fatcat.wiki/file/4udmm4zd4bgfhnaaycqoztgfgm
+    https://qa.fatcat.wiki/file/k73il3k5hzemtnkqa5qyorg6ci
+    https://qa.fatcat.wiki/file/7hstlrabfjb6vgyph7ntqtpkne
+
+Live-web URLs identical except for http/https flip or other trival things (much less frequent case):
+
+    http://eo1.gsfc.nasa.gov/new/validationReport/Technology/JoeCD/asner_etal_PNAS_20041.pdf
+    https://eo1.gsfc.nasa.gov/new/validationReport/Technology/JoeCD/asner_etal_PNAS_20041.pdf
+
+    http://homepages.math.uic.edu/~rosendal/PapersWebsite/BanachMinimalExamples.pdf
+    http://homepages.math.uic.edu:80/~rosendal/PapersWebsite/BanachMinimalExamples.pdf
+    https://qa.fatcat.wiki/file/h2wx6re5fjhx7c6duifzskeo6u
+    https://qa.fatcat.wiki/file/vw7divmjwveftn4djj2cp32n4i
+
+Which bot to use? Let's do `sandcrawler-bot`.
+
+Trying a larger batch to see what database size increase is going to look like,
+and whether single-threaded is going to be too slow:
+
+    # before: Size:  517.87G
+
+    time zcat /srv/fatcat/datasets/fatcat_file_partial.file_meta.json.gz | head -n500000 | pv -l | ./fatcat_import.py --editgroup-description-override "backfill of full file-level metadata for early-imported papers" file-meta -
+    => 145m18.615s
+
+    # after: 518.47G
+    # delta: 600 MB
+
+A million records would take about 5 hours, so 100 hours total, or 4 days. Let's do parallelism.
+
+Total size increase estimated as 24 GBytes. It all adds up!
+
+    time zcat /srv/fatcat/datasets/fatcat_file_partial.file_meta.json.gz | tail -n500000 | pv -l | parallel -j8 --round-robin --pipe -q ./fatcat_import.py --editgroup-description-override 'backfill of full file-level metadata for early-imported papers' file-meta -
+    => real    32m53.935s
+
+## Production Import
+
+Before Size: 624.63G
+
+    export FATCAT_API_AUTH_TOKEN... # sandcrawler-bot
+
+    # start small
+    time zcat /srv/fatcat/datasets/fatcat_file_partial.file_meta.json.gz | pv -l | head -n1000 | parallel -j8 --round-robin --pipe -q ./fatcat_import.py --editgroup-description-override 'backfill of full file-level metadata for early-imported papers' file-meta -
+
+    # full batch
+    time zcat /srv/fatcat/datasets/fatcat_file_partial.file_meta.json.gz | pv -l | parallel -j8 --round-robin --pipe -q ./fatcat_import.py --editgroup-description-override 'backfill of full file-level metadata for early-imported papers' file-meta -
+
+    => 18.1M 20:53:32 [ 241 /s]
+
+    Counter({'total': 2234159, 'update': 2234111, 'skip-existing-complete': 48, 'skip': 0, 'insert': 0, 'exists': 0})
+    (etc, 8x)
+
+After Size: 653.69G (+29GB or so)