f/overrides/event-backup/bfix-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
2022-03-29,0.010000
2024-07-30,0.097000
2025-09-25,0.070000
2025-12-18,0.087000
2022-10-27,0.055000
2023-07-27,0.075000
2023-12-27,0.089000
2024-01-29,0.063000
2022-06-28,0.015000
2023-02-24,0.046000
2024-12-24,0.100000
2025-02-27,0.080000
2023-03-29,0.083000
2023-08-29,0.092000
2024-08-29,0.087000
2026-01-29,0.068000
2022-12-23,0.070000
2023-01-27,0.139000
2023-06-28,0.077000
2024-06-27,0.078000
2024-11-27,0.096000
2026-06-29,0.076000
2025-10-30,0.076000
2026-02-26,0.065000
2026-04-29,0.075000
2023-05-26,0.085000
2023-09-27,0.056000
2024-05-30,0.090000
2026-05-28,0.069000
2024-04-26,0.093000
2025-04-29,0.073000
2023-11-28,0.080000
2025-01-30,0.089000
2022-09-28,0.054000
2023-10-27,0.094000
2024-10-30,0.090000
2026-07-30,0.070000
2023-04-26,0.073000
2025-05-29,0.089000
2025-08-28,0.068000
2024-02-27,0.124000
2022-05-26,0.014000
2025-07-30,0.092000
2025-11-25,0.073000
2022-07-27,0.013000
2022-11-28,0.078000
2024-09-27,0.085000
2025-03-27,0.077000
2022-04-27,0.011000
2022-08-29,0.042000
2024-03-26,0.084000
2025-06-26,0.069000
2026-03-30,0.078000