f/overrides/event-backup/hyi-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
2017-07-19,0.100000
2018-02-15,0.090000
2021-08-23,0.095000
2022-10-21,0.095000
2023-11-21,0.095000
2011-12-14,0.147000
2023-12-20,0.095000
2025-04-23,0.095000
2020-03-23,0.095000
2015-01-21,0.110000
2019-04-17,0.089000
2020-12-22,0.095000
2024-12-23,0.095000
2025-06-23,0.095000
2025-11-20,0.095000
2013-07-17,0.130000
2016-12-21,0.103000
2018-10-18,0.089000
2024-04-22,0.095000
2013-06-19,0.130000
2013-08-21,0.130000
2014-07-16,0.110000
2015-03-18,0.110000
2015-10-21,0.110000
2017-12-21,0.090000
2023-02-17,0.095000
2024-06-21,0.095000
2012-10-17,0.145000
2015-08-19,0.110000
2016-07-20,0.110000
2017-10-19,0.095000
2019-06-20,0.089000
2020-07-23,0.095000
2024-10-24,0.095000
2011-04-19,0.147000
2015-02-18,0.110000
2016-05-18,0.110000
2021-01-21,0.095000
2023-09-21,0.095000
2024-09-23,0.095000
2011-10-19,0.147000
2014-05-21,0.120000
2015-09-16,0.110000
2016-09-21,0.110000
2018-09-20,0.089000
2020-10-22,0.095000
2021-10-21,0.095000
2022-06-22,0.095000
2012-07-18,0.145000
2026-02-20,0.095000
2013-04-17,0.135000
2014-12-17,0.110000
2015-04-15,0.110000
2017-03-22,0.101000
2012-04-18,0.147000
2017-06-21,0.100000
2019-03-21,0.089000
2020-04-22,0.095000
2021-11-19,0.095000
2026-08-24,0.095000
2010-12-15,0.147000
2011-03-16,0.147000
2016-10-19,0.110000
2022-09-22,0.095000
2025-07-24,0.095000
2026-04-23,0.095000
2011-02-16,0.147000
2013-12-18,0.125000
2017-02-15,0.103000
2021-05-20,0.095000
2023-03-23,0.095000
2023-06-22,0.095000
2012-08-22,0.145000
2015-06-17,0.110000
2017-08-23,0.100000
2025-03-24,0.095000
2013-03-13,0.135000
2019-02-14,0.089000
2016-06-15,0.110000
2017-05-17,0.101000
2017-09-21,0.095000
2018-07-19,0.089000
2022-03-23,0.095000
2024-05-22,0.095000
2012-06-20,0.145000
2013-02-13,0.140000
2021-04-22,0.095000
2022-05-20,0.095000
2025-02-21,0.095000
2025-05-22,0.095000
2011-11-16,0.147000
2014-01-22,0.125000
2019-11-21,0.091000
2020-01-23,0.094000
2021-06-22,0.095000
2022-02-17,0.095000
2012-03-21,0.147000
2014-02-19,0.125000
2014-03-19,0.120000
2014-10-22,0.110000
2022-07-21,0.095000
2012-01-18,0.147000
2014-04-15,0.120000
2016-01-20,0.110000
2019-09-19,0.091000
2025-10-24,0.095000
2013-10-16,0.130000
2013-11-20,0.130000
2015-05-20,0.110000
2021-02-18,0.095000
2022-08-23,0.095000
2022-12-21,0.095000
2023-07-21,0.095000
2023-10-23,0.095000
2013-09-18,0.130000
2019-05-23,0.089000
2019-07-18,0.089000
2020-05-20,0.095000
2021-07-22,0.095000
2025-08-22,0.095000
2025-09-23,0.095000
2026-07-24,0.095000
2011-09-21,0.147000
2012-02-15,0.147000
2014-09-17,0.110000
2014-11-19,0.110000
2016-11-16,0.110000
2026-06-23,0.095000
2011-01-19,0.147000
2013-01-16,0.140000
2016-04-20,0.110000
2016-08-17,0.110000
2017-04-19,0.101000
2020-09-22,0.095000
2021-09-22,0.095000
2021-12-22,0.095000
2012-09-19,0.145000
2024-07-24,0.095000
2025-01-24,0.095000
2025-12-23,0.095000
2024-02-21,0.095000
2012-05-16,0.147000
2019-01-17,0.089000
2011-06-15,0.147000
2016-02-17,0.110000
2018-12-20,0.089000
2019-12-19,0.094000
2020-11-19,0.095000
2011-08-17,0.147000
2012-11-20,0.145000
2013-05-22,0.135000
2018-08-23,0.089000
2023-04-20,0.095000
2023-05-22,0.095000
2026-03-24,0.095000
2011-07-20,0.147000
2020-06-22,0.095000
2024-03-20,0.095000
2024-08-23,0.095000
2026-01-23,0.095000
2016-03-16,0.110000
2015-11-18,0.110000
2017-11-22,0.095000
2018-01-18,0.090000
2018-04-19,0.089000
2019-10-17,0.091000
2022-01-21,0.095000
2014-08-20,0.110000
2014-06-18,0.110000
2020-08-21,0.095000
2021-03-23,0.095000
2023-01-23,0.095000
2011-05-18,0.147000
2018-03-22,0.089000
2018-06-21,0.089000
2020-02-20,0.094000
2023-08-23,0.095000
2024-01-23,0.095000
2024-11-21,0.095000
2015-07-22,0.110000
2017-01-18,0.103000
2022-04-21,0.095000
2026-05-21,0.095000
2012-12-12,0.140000
2018-05-24,0.089000
2018-11-21,0.089000
2019-08-22,0.089000
2022-11-21,0.095000
2015-12-16,0.110000