f/overrides/event-backup/hifr-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
2015-09-28,0.225,2017-08-22
2016-03-29,0.25,2017-08-22
2016-09-28,0.25,2017-08-22
2017-03-29,0.25,2017-08-22
2015-06-26,0.225,2017-08-22
2015-12-29,0.225,2017-08-22
2016-06-28,0.25,2017-08-22
2016-12-28,0.25,2017-08-22
2017-06-28,0.25,2017-08-22
2015-03-27,0.14,2017-08-22
2017-09-28,0.25,2017-09-29 08:00:20
2015-06-26,0.225,2017-10-20 09:54:16
2015-12-29,0.225,2017-10-20 09:54:16
2016-06-28,0.25,2017-10-20 09:54:16
2016-12-28,0.25,2017-10-20 09:54:16
2017-06-28,0.25,2017-10-20 09:54:16
2015-03-27,0.14,2017-10-20 09:54:16
2017-12-28,0.25,2018-01-16 07:54:11
2015-03-27,0.14,2018-01-16 07:54:11
2018-03-28,0.25,2018-04-13 15:05:34
2015-12-29,0.225,2018-04-13 15:05:34
2016-06-28,0.25,2018-04-13 15:05:34
2016-12-28,0.25,2018-04-13 15:05:34
2017-06-28,0.25,2018-04-13 15:05:34
2017-12-28,0.25,2018-04-13 15:05:34
2015-03-27,0.14,2018-04-13 15:05:34
2015-09-28,0.225,2018-04-13 15:05:34
2016-09-28,0.25,2018-04-13 15:05:34
2017-09-28,0.25,2018-04-13 15:05:34
2015-06-26,0.225,2018-04-13 15:05:34
2018-06-28,0.25,2018-12-20 11:23:51
2015-03-27,0.14,2018-12-20 11:23:51
2015-09-28,0.225,2018-12-20 11:23:51
2016-09-28,0.25,2018-12-20 11:23:51
2017-09-28,0.25,2018-12-20 11:23:51
2018-09-27,0.25,2018-12-20 11:23:51
2015-06-26,0.225,2018-12-20 11:23:51
2018-12-28,0.25,2019-01-04 11:16:02
2015-09-28,0.225,2019-01-04 11:16:02
2016-09-28,0.25,2019-01-04 11:16:02
2017-09-28,0.25,2019-01-04 11:16:02
2018-09-27,0.25,2019-01-04 11:16:02
2015-06-26,0.225,2019-01-04 11:16:02
2019-03-28,0.25,2019-04-02 14:23:09
2015-12-29,0.225,2019-04-02 14:23:09
2016-06-28,0.25,2019-04-02 14:23:09
2016-12-28,0.25,2019-04-02 14:23:09
2017-06-28,0.25,2019-04-02 14:23:09
2017-12-28,0.25,2019-04-02 14:23:09
2018-06-28,0.25,2019-04-02 14:23:09
2015-03-27,0.14,2019-04-02 14:23:09
2018-12-28,0.25,2019-04-02 14:23:09
2015-09-28,0.225,2019-04-02 14:23:09
2016-09-28,0.25,2019-04-02 14:23:09
2017-09-28,0.25,2019-04-02 14:23:09
2018-09-27,0.25,2019-04-02 14:23:09
2015-06-26,0.225,2019-04-02 14:23:09
2019-06-27,0.25,2019-07-02 10:25:49
2015-12-29,0.225,2019-07-02 10:25:49
2016-06-28,0.25,2019-07-02 10:25:49
2016-12-28,0.25,2019-07-02 10:25:49
2017-06-28,0.25,2019-07-02 10:25:49
2017-12-28,0.25,2019-07-02 10:25:49
2018-06-28,0.25,2019-07-02 10:25:49
2015-03-27,0.14,2019-07-02 10:25:49
2018-12-28,0.25,2019-07-02 10:25:49
2015-09-28,0.225,2019-07-02 10:25:49
2016-09-28,0.25,2019-07-02 10:25:49
2017-09-28,0.25,2019-07-02 10:25:49
2018-09-27,0.25,2019-07-02 10:25:49
2015-06-26,0.225,2019-07-02 10:25:49