f/overrides/event-backup/hwdvx-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
2015-02-26,0.009000
2017-12-27,0.003000
2019-03-28,0.036000
2016-02-26,0.012000
2018-09-27,0.038000
2015-03-30,0.009000
2015-10-29,0.010000
2015-12-11,0.257000
2021-03-29,0.023000
2022-03-29,0.025000
2025-06-26,0.090000
2015-06-29,0.011000
2016-01-28,0.010000
2019-12-17,0.049000
2019-06-27,0.036000
2020-06-26,0.019000
2020-12-29,0.051000
2021-12-17,0.033000
2023-03-29,0.070000
2015-05-28,0.011000
2015-12-29,0.005000
2018-12-27,0.409000
2026-06-26,0.088000
2024-06-26,0.102000
2025-03-27,0.098000
2025-12-29,0.267000
2026-03-27,0.078000
2014-11-26,0.011000
2015-01-29,0.008000
2015-08-27,0.011000
2024-09-26,0.102000
2015-11-27,0.012000
2019-12-27,0.179000
2021-09-28,0.025000
2016-03-30,0.010000
2019-09-27,0.033000
2021-12-29,0.082000
2023-06-28,0.078000
2024-12-27,0.189000
2014-12-30,0.301000
2015-07-30,0.011000
2015-09-29,0.012000
2025-09-26,0.094000
2021-06-28,0.025000
2023-09-27,0.076000
2023-12-27,0.099000
2024-03-26,0.095000
2015-04-29,0.009000
2018-12-17,0.010000
2020-03-27,0.026000