f/overrides/event-backup/dsdyx-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
2021-12-22,0.913000
2025-09-30,0.108000
2014-12-31,0.775000
2018-09-28,0.185000
2014-09-30,0.115000
2015-09-30,0.112000
2018-12-31,0.615000
2020-12-30,0.499000
2025-06-30,0.099000
2013-12-30,0.306000
2014-06-30,0.107000
2023-12-20,0.363000
2024-06-28,0.063000
2026-06-30,0.104000
2015-06-30,0.066000
2021-09-30,0.058000
2018-06-29,0.016000
2022-03-31,0.095000
2022-12-21,0.631000
2024-09-30,0.064000
2024-12-31,0.557000
2013-09-30,0.093000
2018-03-29,0.014000
2017-06-30,0.094000
2017-12-29,0.291000
2020-03-31,0.041000
2020-06-30,0.041000
2022-09-30,0.128000
2024-03-28,0.043000
2014-03-31,0.121000
2015-12-31,0.208000
2025-03-31,0.084000
2026-03-31,0.034000
2015-03-31,0.218000
2025-12-31,0.440000
2019-12-31,0.110000
2021-03-31,0.257000
2016-12-30,0.518000
2017-03-31,0.211000