f/overrides/event-backup/biabx-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

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Date,Dividends,ctime
2018-10-31,0.028,2019-04-25 14:52:28
2016-01-29,0.023,2019-04-25 14:52:28
2016-07-29,0.018,2019-04-25 14:52:28
2017-03-31,0.019,2019-04-25 14:52:28
2019-03-29,0.029,2019-04-25 14:52:28
2017-11-30,0.023,2019-04-25 14:52:28
2016-12-28,0.019,2019-04-25 14:52:28
2017-06-30,0.021,2019-04-25 14:52:28
2016-10-31,0.02,2019-04-25 14:52:28
2018-08-31,0.027,2019-04-25 14:52:28
2015-09-30,0.032,2019-04-25 14:52:28
2016-05-31,0.019,2019-04-25 14:52:28
2016-11-30,0.019,2019-04-25 14:52:28
2017-09-29,0.021,2019-04-25 14:52:28
2018-05-31,0.027,2019-04-25 14:52:28
2018-01-31,0.02,2019-04-25 14:52:28
2017-04-28,0.017,2019-04-25 14:52:28
2017-02-28,0.017,2019-04-25 14:52:28
2016-08-31,0.022,2019-04-25 14:52:28
2019-02-28,0.027,2019-04-25 14:52:28
2017-10-31,0.022,2019-04-25 14:52:28
2015-07-31,0.155,2019-04-25 14:52:28
2018-03-29,0.024,2019-04-25 14:52:28
2016-03-31,0.027,2019-04-25 14:52:28
2017-07-31,0.02,2019-04-25 14:52:28
2018-11-30,0.026,2019-04-25 14:52:28
2015-12-29,0.061,2019-04-25 14:52:28
2015-10-30,0.03,2019-04-25 14:52:28
2017-12-27,0.027,2019-04-25 14:52:28
2016-06-30,0.02,2019-04-25 14:52:28
2018-06-29,0.022,2019-04-25 14:52:28
2017-08-31,0.023,2019-04-25 14:52:28
2014-12-23,0.055,2019-04-25 14:52:28
2015-11-30,0.023,2019-04-25 14:52:28
2018-12-21,0.034,2019-04-25 14:52:28
2016-09-30,0.021,2019-04-25 14:52:28
2017-05-31,0.021,2019-04-25 14:52:28
2018-09-28,0.026,2019-04-25 14:52:28
2017-01-31,0.015,2019-04-25 14:52:28
2018-07-31,0.03,2019-04-25 14:52:28
2016-04-29,0.022,2019-04-25 14:52:28
2019-01-31,0.023,2019-04-25 14:52:28
2015-08-31,0.032,2019-04-25 14:52:28
2016-02-29,0.025,2019-04-25 14:52:28
2018-02-28,0.019,2019-04-25 14:52:28
2018-04-30,0.024,2019-04-25 14:52:28
2019-11-29,0.024,2020-04-15 13:22:12
2016-12-28,0.019,2020-04-15 13:22:12
2017-06-30,0.021,2020-04-15 13:22:12
2019-04-30,0.032,2020-04-15 13:22:12
2019-12-20,0.033,2020-04-15 13:22:12
2016-05-31,0.019,2020-04-15 13:22:12
2017-09-29,0.021,2020-04-15 13:22:12
2018-01-31,0.02,2020-04-15 13:22:12
2019-07-31,0.031,2020-04-15 13:22:12
2016-08-31,0.022,2020-04-15 13:22:12
2019-02-28,0.025,2020-04-15 13:22:12
2017-10-31,0.022,2020-04-15 13:22:12
2016-03-31,0.027,2020-04-15 13:22:12
2017-07-31,0.02,2020-04-15 13:22:12
2019-05-31,0.029,2020-04-15 13:22:12
2017-12-27,0.027,2020-04-15 13:22:12
2016-06-30,0.02,2020-04-15 13:22:12
2019-08-30,0.029,2020-04-15 13:22:12
2020-02-28,0.022,2020-04-15 13:22:12
2015-11-30,0.023,2020-04-15 13:22:12
2016-09-30,0.021,2020-04-15 13:22:12
2018-07-31,0.03,2020-04-15 13:22:12
2019-01-31,0.023,2020-04-15 13:22:12
2015-08-31,0.032,2020-04-15 13:22:12
2016-02-29,0.025,2020-04-15 13:22:12
2018-04-30,0.024,2020-04-15 13:22:12
2016-01-29,0.023,2020-04-15 13:22:12
2016-07-29,0.018,2020-04-15 13:22:12
2019-03-29,0.03,2020-04-15 13:22:12
2017-11-30,0.023,2020-04-15 13:22:12
2019-09-30,0.028,2020-04-15 13:22:12
2019-06-28,0.026,2020-04-15 13:22:12
2016-10-31,0.02,2020-04-15 13:22:12
2018-08-31,0.027,2020-04-15 13:22:12
2015-09-30,0.032,2020-04-15 13:22:12
2016-11-30,0.019,2020-04-15 13:22:12
2018-05-31,0.027,2020-04-15 13:22:12
2017-04-28,0.017,2020-04-15 13:22:12
2020-03-31,0.029,2020-04-15 13:22:12
2020-01-31,0.021,2020-04-15 13:22:12
2017-02-28,0.017,2020-04-15 13:22:12
2019-10-31,0.03,2020-04-15 13:22:12
2015-07-31,0.155,2020-04-15 13:22:12
2018-03-29,0.024,2020-04-15 13:22:12
2018-11-30,0.026,2020-04-15 13:22:12
2015-12-29,0.061,2020-04-15 13:22:12
2015-10-30,0.03,2020-04-15 13:22:12
2018-06-29,0.022,2020-04-15 13:22:12
2017-08-31,0.023,2020-04-15 13:22:12
2014-12-23,0.055,2020-04-15 13:22:12
2018-12-21,0.034,2020-04-15 13:22:12
2017-05-31,0.021,2020-04-15 13:22:12
2018-09-28,0.026,2020-04-15 13:22:12
2017-01-31,0.015,2020-04-15 13:22:12
2016-04-29,0.022,2020-04-15 13:22:12
2018-02-28,0.019,2020-04-15 13:22:12