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+
+
+## Prep
+
+Using `check_hashes.sh`:
+
+    zcat $HASH_FILE \
+        | awk '{print $3 "\t" $1}' \
+        | rg -v '^\t' \
+        | sort -S 4G \
+        | uniq -D -w 40 \
+        > sha1_ident.dupes.tsv
+
+    wc -l sha1_ident.dupes.tsv 
+    # 6,350
+
+    cut -f1 sha1_ident.dupes.tsv | uniq | wc -l
+    # 2,039
+
+Want to create JSON for each group, like:
+
+    entity_type: "file"
+    primary_id: str or None
+    duplicate_ids: [str]
+    evidence:
+        extid: str
+        extid_type: "sha1"
+
+Run transform script:
+
+    cat sha1_ident.dupes.tsv | ./file_dupe_to_json.py | pv -l > file_sha1_dupes.json
+    # 2.04k 0:00:00 [9.16k/s]
+
+
+## QA Testing
+
+    export FATCAT_AUTH_API_TOKEN=[...]
+
+    head -n25 /srv/fatcat/datasets/file_sha1_dupes.json \
+        | python -m fatcat_tools.mergers.files --editgroup-description-override "Automated merging of file entities with duplicate SHA-1 hashes" --dry-run merge-files -
+
+Hit some small bugs running in QA; test coverage isn't great, but I think hits
+the important parts.
+
+    head -n25 /srv/fatcat/datasets/file_sha1_dupes.json \
+        | python -m fatcat_tools.mergers.files --editgroup-description-override "Automated merging of file entities with duplicate SHA-1 hashes" --dry-run merge-files -
+    # Running in dry-run mode!
+    # Counter({'updated-entities': 60, 'lines': 25, 'merged': 25, 'skip': 0, 'updated-total': 0})
+
+Dry-run mode didn't actually work, and edits actually happened (!).
+
+Edits do look good.
+
+Try again, not dry-run, to ensure that case is handled:
+
+    head -n25 /srv/fatcat/datasets/file_sha1_dupes.json | python -m fatcat_tools.mergers.files --editgroup-description-override "Automated merging of file entities with duplicate SHA-1 hashes" merge-files -
+    # Counter({'lines': 25, 'skip': 25, 'skip-not-active-entity': 25, 'merged': 0, 'updated-total': 0})
+
+And then run 500 through for more testing:
+
+    head -n500 /srv/fatcat/datasets/file_sha1_dupes.json | python -m fatcat_tools.mergers.files --editgroup-description-override "Automated merging of file entities with duplicate SHA-1 hashes" merge-files -
+    # Counter({'updated-entities': 1341, 'lines': 500, 'merged': 474, 'skip': 26, 'skip-not-active-entity': 25, 'skip-entity-not-found': 1, 'updated-total': 0})
+
+The majority of merges seem to be cases where there are multiple articles in the same PDF.