f/overrides/event-backup/dbalx-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
2024-06-14,0.070000
2024-12-26,0.103000
2016-12-28,0.031000
2019-06-14,0.072000
2021-03-15,0.045000
2022-09-15,0.048000
2023-12-26,0.084000
2022-12-05,0.022000
2026-06-15,0.173000
2016-03-15,0.020000
2018-03-15,0.029000
2018-06-15,0.140000
2019-03-15,0.050000
2021-12-03,0.022000
2016-09-15,0.029000
2022-12-27,0.078000
2023-03-15,0.059000
2025-06-16,0.143000
2025-12-26,0.107000
2017-12-04,0.058000
2020-03-16,0.060000
2023-06-15,0.056000
2023-09-15,0.073000
2016-06-15,0.032000
2017-03-15,0.036000
2022-03-15,0.027000
2024-12-04,0.154000
2025-09-15,0.085000
2020-09-15,0.047000
2020-12-28,0.097000
2021-09-15,0.048000
2017-06-15,0.091000
2017-09-15,0.051000
2018-09-17,0.056000
2019-12-27,0.076000
2020-06-15,0.044000
2022-06-15,0.326000
2024-09-16,0.082000
2025-12-04,0.296000
2026-03-16,0.079000
2017-12-27,0.042000
2018-12-27,0.065000
2019-09-16,0.055000
2019-12-05,0.080000
2025-03-14,0.083000
2021-06-15,0.032000
2021-12-28,0.073000
2024-03-15,0.076000