f/overrides/event-backup/bcrh-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
2016-03-29,0.3,2017-08-22
2017-03-29,0.3,2017-08-22
2015-02-25,0.66,2017-08-22
2014-07-11,0.3,2017-08-22
2016-02-25,1.24,2017-08-22
2016-06-28,0.3,2017-08-22
2017-06-28,0.3,2017-08-22
2015-03-27,0.3,2017-08-22
2015-09-28,0.3,2017-08-22
2016-09-28,0.3,2017-08-22
2015-06-26,0.3,2017-08-22
2017-02-24,0.59,2017-08-22
2014-09-26,0.3,2017-08-22
2014-04-11,0.3,2017-08-22
2017-09-28,0.3,2017-09-28 06:48:39
2015-06-26,0.3,2017-10-20 09:54:16
2017-02-24,0.59,2017-10-20 09:54:16
2014-09-26,0.3,2017-10-20 09:54:16
2014-04-11,0.3,2017-10-20 09:54:16
2018-03-28,0.3,2018-04-13 15:05:34
2015-02-25,0.66,2018-04-13 15:05:34
2014-07-11,0.3,2018-04-13 15:05:34
2016-02-25,1.24,2018-04-13 15:05:34
2016-06-28,0.3,2018-04-13 15:05:34
2017-06-28,0.3,2018-04-13 15:05:34
2015-03-27,0.3,2018-04-13 15:05:34
2015-09-28,0.3,2018-04-13 15:05:34
2016-09-28,0.3,2018-04-13 15:05:34
2017-09-28,0.3,2018-04-13 15:05:34
2015-06-26,0.3,2018-04-13 15:05:34
2017-02-24,0.59,2018-04-13 15:05:34
2014-09-26,0.3,2018-04-13 15:05:34
2014-04-11,0.3,2018-04-13 15:05:34
2018-06-28,0.3,2018-12-20 11:23:51
2015-03-27,0.3,2018-12-20 11:23:51
2015-09-28,0.3,2018-12-20 11:23:51
2016-09-28,0.3,2018-12-20 11:23:51
2017-09-28,0.3,2018-12-20 11:23:51
2018-09-27,0.3,2018-12-20 11:23:51
2015-06-26,0.3,2018-12-20 11:23:51
2017-02-24,0.59,2018-12-20 11:23:51
2014-09-26,0.3,2018-12-20 11:23:51
2014-04-11,0.3,2018-12-20 11:23:51
2019-03-28,0.15,2019-05-09 11:16:22
2015-02-25,0.66,2019-05-09 11:16:22
2014-07-11,0.3,2019-05-09 11:16:22
2016-02-25,1.24,2019-05-09 11:16:22
2016-06-28,0.3,2019-05-09 11:16:22
2017-06-28,0.3,2019-05-09 11:16:22
2018-06-28,0.3,2019-05-09 11:16:22
2015-03-27,0.3,2019-05-09 11:16:22
2015-09-28,0.3,2019-05-09 11:16:22
2016-09-28,0.3,2019-05-09 11:16:22
2017-09-28,0.3,2019-05-09 11:16:22
2018-09-27,0.3,2019-05-09 11:16:22
2015-06-26,0.3,2019-05-09 11:16:22
2017-02-24,0.59,2019-05-09 11:16:22
2014-09-26,0.3,2019-05-09 11:16:22
2014-04-11,0.3,2019-05-09 11:16:22
2019-06-27,0.15,2019-07-02 10:25:49
2015-03-27,0.3,2019-07-02 10:25:49
2015-09-28,0.3,2019-07-02 10:25:49
2016-09-28,0.3,2019-07-02 10:25:49
2017-09-28,0.3,2019-07-02 10:25:49
2018-09-27,0.3,2019-07-02 10:25:49
2015-06-26,0.3,2019-07-02 10:25:49
2017-02-24,0.59,2019-07-02 10:25:49
2014-09-26,0.3,2019-07-02 10:25:49
2014-04-11,0.3,2019-07-02 10:25:49
2019-09-13,1.51,2019-09-17 10:49:56
2019-03-28,0.15,2019-09-17 10:49:56
2015-02-25,0.66,2019-09-17 10:49:56
2014-07-11,0.3,2019-09-17 10:49:56
2016-02-25,1.24,2019-09-17 10:49:56
2016-06-28,0.3,2019-09-17 10:49:56
2017-06-28,0.3,2019-09-17 10:49:56
2018-06-28,0.3,2019-09-17 10:49:56
2019-06-27,0.15,2019-09-17 10:49:56
2015-03-27,0.3,2019-09-17 10:49:56
2015-09-28,0.3,2019-09-17 10:49:56
2016-09-28,0.3,2019-09-17 10:49:56
2017-09-28,0.3,2019-09-17 10:49:56
2018-09-27,0.3,2019-09-17 10:49:56
2015-06-26,0.3,2019-09-17 10:49:56
2017-02-24,0.59,2019-09-17 10:49:56
2014-09-26,0.3,2019-09-17 10:49:56
2014-04-11,0.3,2019-09-17 10:49:56
2019-12-05,0.57,2020-03-03 11:53:28
2016-03-29,0.3,2020-03-03 11:53:28
2017-03-29,0.3,2020-03-03 11:53:28
2018-03-28,0.3,2020-03-03 11:53:28
2019-09-13,1.51,2020-03-03 11:53:28
2019-03-28,0.15,2020-03-03 11:53:28
2015-02-25,0.66,2020-03-03 11:53:28
2014-07-11,0.3,2020-03-03 11:53:28
2016-02-25,1.24,2020-03-03 11:53:28
2016-06-28,0.3,2020-03-03 11:53:28
2017-06-28,0.3,2020-03-03 11:53:28
2018-06-28,0.3,2020-03-03 11:53:28
2019-06-27,0.15,2020-03-03 11:53:28
2015-03-27,0.3,2020-03-03 11:53:28
2015-09-28,0.3,2020-03-03 11:53:28
2016-09-28,0.3,2020-03-03 11:53:28
2017-09-28,0.3,2020-03-03 11:53:28
2018-09-27,0.3,2020-03-03 11:53:28
2015-06-26,0.3,2020-03-03 11:53:28
2017-02-24,0.59,2020-03-03 11:53:28
2014-09-26,0.3,2020-03-03 11:53:28
2014-04-11,0.3,2020-03-03 11:53:28
2020-03-18,6.0,2020-03-31 17:10:22
2017-06-28,0.3,2020-03-31 17:10:22
2018-06-28,0.3,2020-03-31 17:10:22
2019-06-27,0.15,2020-03-31 17:10:22
2015-03-27,0.3,2020-03-31 17:10:22
2015-09-28,0.3,2020-03-31 17:10:22
2016-09-28,0.3,2020-03-31 17:10:22
2017-09-28,0.3,2020-03-31 17:10:22
2018-09-27,0.3,2020-03-31 17:10:22
2015-06-26,0.3,2020-03-31 17:10:22
2017-02-24,0.59,2020-03-31 17:10:22
2014-09-26,0.3,2020-03-31 17:10:22
2014-04-11,0.3,2020-03-31 17:10:22