f/overrides/event-backup/btirx-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
2018-06-22,2.500000
2021-06-23,3.459000
2025-12-15,20.397000
2019-12-16,19.375000
2020-09-23,0.769000
2020-12-15,30.182000
2020-03-24,0.832000
2021-03-24,0.700000
2024-06-21,2.849000
2024-12-16,27.751000
2026-03-24,0.329000
2017-06-23,5.679000
2017-12-15,25.973000
2018-09-21,1.013000
2021-12-15,27.368000
2022-12-15,18.848000
2023-09-22,0.654000
2025-03-24,0.379000
2018-03-22,0.813000
2022-09-23,0.621000
2023-06-23,1.263000
2024-03-21,0.513000
2025-06-23,0.412000
2024-09-23,0.535000
2019-03-22,0.824000
2019-06-21,6.481000
2020-06-23,7.278000
2022-03-24,0.622000
2022-06-23,2.062000
2023-03-24,0.579000
2023-12-15,37.782000
2017-09-22,0.972000
2018-12-17,35.010000
2021-09-23,0.678000
2025-09-23,0.431000
2019-09-23,0.877000
2026-06-23,6.561000