f/overrides/event-backup/iscg-dividend.csv
Greg Pomerantz bb8e39605e Event-history protection: backup dir, empty-download fallback, docs
Yahoo's 2026 event-feed change (capitalGain events dropped for some
funds; no events at all for terminated tickers) can wipe good event
history on re-download. Defense in depth:

- overrides/event-backup/: last-known-good copy of every dividend/
  capitalGain file (8,192 files, 58 MB); refresh with
  scripts/backup_events.py after each dump update
- data.py event_file(): frozen > data-root (while populated) > backup;
  used by panel reads, verify_official, and the double-listing scanner
- README: capital-gain files are mutual-fund-only in this dump; Yahoo
  has no LT/ST split (tax.py taxes capg at lt_rate; the per-fund split
  would come from fund-company annual tax statements or commercial feeds)
- tests: exact Timestamp .loc keys (pandas 3.x string matching returns a
  Series on large DatetimeIndex)
2026-08-31 21:59:25 -04:00

1.5 KiB

1DateDividends
22018-03-220.023500
32018-09-260.017667
42019-06-170.017833
52023-09-260.103000
62023-12-200.084000
72024-12-170.210000
82008-09-250.004167
92015-09-250.030167
102011-06-230.006500
112013-03-250.018833
122013-12-230.036667
132014-12-240.046167
142016-03-230.027667
152025-03-180.066000
162008-06-240.003333
172010-06-230.000500
182008-12-240.038167
192021-03-250.008167
202014-09-240.022000
212017-12-190.049500
222020-03-250.009833
232020-12-140.015167
242021-09-240.110000
252012-09-250.034667
262012-12-190.133500
272017-06-270.034667
282017-09-260.020667
292022-09-260.119000
302015-06-240.033333
312016-12-210.178000
322021-12-130.123000
332022-03-240.041000
342023-06-070.072000
352025-09-160.087000
362005-09-260.001167
372007-12-270.006667
382023-03-230.079000
392024-09-250.087000
402025-12-160.108000
412015-03-250.040000
422016-09-260.037333
432011-09-260.013333
442020-06-150.026000
452015-12-240.040833
462018-12-170.029167
472007-06-290.016167
482008-03-250.014833
492018-06-260.040000
502019-12-160.041500
512022-06-090.056000
522011-03-250.012000
532017-03-240.050500
542019-03-200.012000
552026-03-170.078000
562010-09-240.005000
572012-06-190.019833
582022-12-130.115000
592009-09-230.001333
602013-09-240.029167
612013-06-260.032167
622009-06-230.002667
632010-12-230.024000
642016-06-210.043167
652021-06-100.069000
662024-06-110.058000
672007-09-260.003667
682011-12-220.011833
692019-09-240.024333
702025-06-160.080000
712014-03-250.028333
722014-06-240.029167
732012-03-260.025333
742024-03-210.059000
752026-06-150.099000
762009-12-240.005333
772010-03-250.004333