Add submissions/2014-04 (9 shards, 4.1M rows)

data/submissions/2014/04/000.parquet

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+oid sha256:b41fb11fa822ccb66b28f6ef3bc8b757aabae0b97c2707a986ff37695e1cbe13
+size 72986131

data/submissions/2014/04/001.parquet

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+oid sha256:e495b9c46283313a0e64bdfeaf363600ccd749c674f1a2ed4a18cbcec9b5efb9
+size 72128797

data/submissions/2014/04/002.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:8cfa267f88daca69e8ccdbc7d9dddd1cd1b4db1e057f714f7ea6012a85a011b4
+size 72438995

data/submissions/2014/04/003.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:53c371d35b311b3aaef7b321bcd33f6147ed2859cbe9873731b520f6107f62e3
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data/submissions/2014/04/004.parquet

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+size 72504908

data/submissions/2014/04/005.parquet

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+oid sha256:d13f88c49220a3b4b912c2fa7643de6386edc3b3539949961f30c40ce4a364f2
+size 72607797

data/submissions/2014/04/006.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:50305946c4d4f71cc7024492e7c0ef268d099da362e5e4f156af14939098e3ee
+size 73180159

data/submissions/2014/04/007.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:5e41c49a420189224359a2a897450c8c0b49c38601cb6ad6d5545b468b9a8378
+size 73912125

data/submissions/2014/04/008.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:867c4c0a951bb863c5a49eeb1331b08d2b692cec0ceaaec164eab09399ab356b
+size 16679735

stats.csv

@@ -198,7 +198,8 @@ year,month,type,shards,count,size_bytes,zst_bytes,dur_download_s,dur_process_s,d
 2014,2,comments,78,38703362,3466781959,0,1356.21,5641.84,320.73,2026-03-31T10:31:53Z
 2014,2,submissions,8,3946491,584210005,0,170.82,1283.08,61.11,2026-03-31T08:57:52Z
 2014,3,comments,85,42459956,3814424643,0,1984.00,6196.25,378.46,2026-03-31T12:48:24Z
-2014,3,submissions,9,4209109,615222707,0,558.34,1153.68,0.00,2026-03-31T13:07:38Z
+2014,3,submissions,9,4209109,615222707,0,558.34,1153.68,49.62,2026-03-31T13:07:38Z
+2014,4,submissions,9,4115035,599342017,0,327.49,1076.47,0.00,2026-03-31T13:31:12Z
 2017,11,submissions,21,10377379,1359465934,2313597673,502.64,4750.99,175.00,2026-03-21T01:34:51Z
 2018,1,submissions,23,11306843,1486493503,2605287865,536.02,5688.66,194.12,2026-03-20T23:42:25Z
 2019,11,submissions,43,21243315,2326097927,5937769829,587.53,1560.69,326.56,2026-03-20T16:58:15Z