f/overrides/event-backup/cphux-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
2018-08-24,0.076000
2020-09-24,0.073000
2021-06-24,0.070000
2021-09-24,0.063000
2013-10-25,0.088000
2015-07-24,0.088000
2017-07-25,0.056000
2019-08-23,0.084000
2019-11-25,0.080000
2021-01-25,0.070000
2021-04-26,0.070000
2014-06-25,0.080000
2014-09-24,0.080000
2015-08-25,0.092000
2014-11-25,0.080000
2016-12-15,0.112000
2017-09-25,0.072000
2020-01-24,0.076000
2013-07-25,0.080000
2013-08-26,0.080000
2016-11-22,0.052000
2014-02-25,0.080000
2015-01-23,0.080000
2024-05-24,0.102000
2017-06-21,0.056000
2024-10-25,0.097000
2025-03-25,0.097000
2015-05-26,0.080000
2016-01-25,0.080000
2016-03-24,0.072000
2024-06-24,0.101000
2026-01-26,0.097000
2019-05-24,0.084000
2022-06-24,0.070000
2023-03-27,0.092000
2021-11-22,0.062000
2024-03-22,0.103000
2015-03-25,0.080000
2019-06-24,0.084000
2019-10-25,0.084000
2018-09-24,0.076000
2018-12-13,0.244000
2019-12-17,0.076000
2022-05-24,0.066000
2014-12-17,0.572000
2017-03-22,0.060000
2018-01-25,0.072000
2020-12-14,0.073000
2025-08-25,0.097000
2026-04-24,0.097000
2015-06-25,0.088000
2016-09-23,0.064000
2018-06-25,0.072000
2019-09-24,0.084000
2020-07-24,0.076000
2021-05-24,0.070000
2023-12-14,0.125000
2026-07-27,0.100000
2014-10-24,0.080000
2017-10-25,0.072000
2018-02-23,0.072000
2017-12-14,0.348000
2019-01-25,0.084000
2026-03-25,0.097000
2014-03-25,0.080000
2015-09-25,0.092000
2017-04-25,0.064000
2023-01-25,0.089000
2026-05-22,0.098000
2020-11-23,0.073000
2022-02-22,0.061000
2022-08-25,0.076000
2017-08-25,0.056000
2018-07-25,0.072000
2020-03-25,0.076000
2023-07-25,0.096000
2014-01-24,0.080000
2016-10-25,0.048000
2017-02-23,0.060000
2026-06-24,0.097000
2014-05-23,0.080000
2015-11-23,0.092000
2021-03-25,0.070000
2020-08-25,0.076000
2025-05-23,0.096000
2025-10-27,0.097000
2013-12-17,0.876000
2015-02-25,0.080000
2017-05-24,0.060000
2021-12-09,0.343000
2022-12-14,0.109000
2013-11-25,0.088000
2023-08-25,0.097000
2025-04-24,0.096000
2024-07-25,0.100000
2018-04-25,0.072000
2020-10-26,0.073000
2024-04-24,0.102000
2022-07-25,0.074000
2023-10-25,0.101000
2025-09-24,0.097000
2020-06-24,0.076000
2021-07-26,0.070000
2021-08-25,0.067000
2019-02-25,0.084000
2024-09-24,0.097000
2025-11-21,0.096000
2015-12-17,0.104000
2016-05-25,0.064000
2016-08-25,0.064000
2023-02-22,0.091000
2025-06-24,0.097000
2016-06-24,0.064000
2017-01-25,0.064000
2022-01-25,0.062000
2021-10-25,0.062000
2022-04-25,0.064000
2022-10-25,0.083000
2022-11-23,0.085000
2024-01-25,0.103000
2016-04-25,0.072000
2016-07-25,0.064000
2019-03-25,0.084000
2020-05-26,0.076000
2023-06-26,0.094000
2023-09-25,0.098000
2024-02-23,0.102000
2025-02-24,0.096000
2015-04-24,0.080000
2018-10-25,0.080000
2020-02-25,0.076000
2017-11-21,0.072000
2022-09-26,0.076000
2023-05-24,0.093000
2016-02-24,0.072000
2019-04-25,0.084000
2024-08-26,0.099000
2025-12-12,0.101000
2013-09-24,0.080000
2014-08-25,0.080000
2021-02-22,0.070000
2018-05-24,0.072000
2018-11-26,0.088000
2026-02-23,0.096000
2014-07-25,0.080000
2024-11-21,0.097000
2025-07-25,0.097000
2023-04-24,0.093000
2023-11-22,0.102000
2024-12-13,0.097000
2025-01-27,0.097000
2015-10-23,0.092000
2019-07-25,0.084000
2022-03-25,0.063000
2014-04-25,0.080000
2018-03-23,0.072000
2020-04-24,0.076000