f/overrides/event-backup/hygh-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
2017-02-02,0.276000
2023-05-02,0.483000
2023-11-02,0.752000
2025-07-02,0.487000
2016-09-02,0.319000
2018-11-02,0.494000
2024-04-02,0.573000
2016-05-03,0.315000
2017-12-28,0.391000
2018-10-02,0.421000
2020-06-02,0.274000
2024-06-04,0.549000
2024-12-03,0.508000
2024-08-02,0.582000
2017-06-02,0.382000
2020-09-02,0.235000
2020-12-02,0.334000
2021-08-03,0.269000
2021-10-04,0.274000
2023-09-05,0.730000
2023-12-04,0.646000
2025-03-04,0.493000
2014-12-02,0.431000
2015-03-03,0.399000
2016-12-28,0.386000
2021-09-02,0.261000
2023-08-02,0.624000
2026-03-03,0.472000
2026-04-02,0.492000
2014-09-03,0.444000
2016-04-04,0.325000
2017-11-02,0.365000
2022-02-02,0.278000
2022-12-23,0.552000
2023-02-02,0.578000
2015-12-28,0.503000
2019-09-04,0.347000
2020-04-02,0.374000
2020-11-03,0.304000
2022-12-02,0.525000
2024-09-04,0.561000
2025-06-03,0.505000
2026-02-03,0.429000
2015-02-03,0.372000
2015-05-04,0.405000
2016-12-02,0.405000
2018-03-02,0.349000
2023-03-02,0.667000
2026-05-04,0.488000
2016-07-06,0.352000
2016-08-02,0.337000
2018-09-05,0.426000
2022-11-02,0.480000
2023-06-02,0.517000
2023-10-03,0.699000
2018-06-04,0.460000
2018-12-04,0.433000
2019-03-04,0.395000
2019-08-02,0.359000
2014-08-04,0.450000
2016-06-02,0.353000
2018-12-28,0.830000
2026-06-02,0.455000
2017-09-06,0.368000
2018-07-03,0.438000
2018-08-02,0.447000
2019-12-03,0.324000
2022-07-05,0.385000
2022-10-04,0.543000
2025-09-03,0.480000
2015-10-02,0.373000
2015-12-02,0.380000
2017-05-02,0.358000
2021-06-02,0.275000
2021-12-02,0.260000
2023-07-05,0.561000
2024-02-02,0.575000
2015-06-02,0.407000
2015-07-02,0.399000
2018-05-02,0.429000
2020-03-03,0.336000
2025-04-02,0.510000
2021-07-02,0.272000
2024-07-02,0.520000
2014-10-02,0.403000
2017-10-03,0.340000
2019-12-24,0.296000
2020-02-04,0.286000
2022-05-03,0.344000
2025-05-02,0.514000
2015-11-03,0.340000
2018-04-03,0.395000
2022-06-02,0.343000
2026-08-04,0.444000
2016-02-02,0.197000
2018-02-02,0.344000
2019-07-02,0.390000
2020-12-24,0.274000
2021-04-05,0.254000
2024-03-04,0.640000
2025-12-02,0.451000
2016-03-02,0.358000
2017-07-06,0.417000
2019-06-04,0.398000
2024-10-02,0.552000
2015-04-02,0.410000
2015-08-04,0.400000
2017-12-04,0.368000
2022-04-04,0.358000
2024-11-04,0.551000
2025-12-23,0.475000
2017-04-04,0.379000
2022-03-02,0.306000
2024-05-02,0.621000
2019-10-02,0.319000
2020-07-02,0.273000
2020-10-02,0.275000
2021-11-02,0.264000
2023-12-22,0.730000
2025-11-04,0.499000
2014-11-04,0.411000
2017-08-02,0.379000
2020-08-04,0.240000
2022-08-02,0.408000
2023-04-04,0.532000
2025-02-04,0.507000
2025-08-04,0.513000
2019-05-02,0.373000
2021-05-04,0.278000
2014-12-26,0.388000
2019-04-02,0.396000
2020-05-04,0.304000
2021-02-02,0.305000
2025-10-02,0.477000
2016-10-04,0.377000
2019-11-04,0.321000
2021-03-02,0.273000
2021-12-23,0.303000
2026-07-02,0.447000
2014-07-02,0.864000
2024-12-20,0.547000
2016-11-02,0.392000
2017-03-02,0.332000
2019-02-04,0.463000
2022-09-02,0.571000