f/overrides/event-backup/hytr-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
2022-08-18,0.014000
2022-11-17,0.033000
2023-03-16,0.112000
2023-05-18,0.095000
2020-03-13,0.084000
2020-08-14,0.072000
2021-05-14,0.071000
2023-08-17,0.099000
2023-09-14,0.101000
2025-09-19,0.098000
2021-02-12,0.072000
2021-03-15,0.075000
2021-08-13,0.100000
2026-06-12,0.108000
2021-06-15,0.067000
2021-09-15,0.067000
2023-12-14,0.205000
2020-09-15,0.083000
2021-10-15,0.071000
2022-09-15,0.018000
2024-04-18,0.095000
2026-08-14,0.106000
2021-12-15,0.152000
2023-04-13,0.097000
2024-03-14,0.105000
2024-10-17,0.111000
2025-02-14,0.096000
2026-03-13,0.104000
2021-04-15,0.070000
2024-11-14,0.112000
2025-10-17,0.127000
2025-08-15,0.106000
2025-11-14,0.088000
2026-07-17,0.104000
2024-02-15,0.095000
2024-07-18,0.106000
2021-07-15,0.074000
2023-02-16,0.104000
2023-06-15,0.088000
2025-12-12,0.230000
2020-06-15,0.010000
2021-11-15,0.065000
2025-03-14,0.102000
2020-11-13,0.100000
2025-05-16,0.102000
2023-10-19,0.105000
2024-12-12,0.137000
2025-06-13,0.104000
2020-04-15,0.014000
2020-12-15,0.170000
2022-07-12,0.019000
2024-08-15,0.057000
2026-02-13,0.092000
2020-07-15,0.025000
2022-10-18,0.018000
2022-12-15,0.143000
2024-12-30,0.036000
2026-04-17,0.068000
2020-02-14,0.096000
2020-05-15,0.011000
2024-05-16,0.115000
2023-11-16,0.053000
2024-06-13,0.106000
2024-09-19,0.131000
2025-04-17,0.102000
2025-07-18,0.101000
2020-10-15,0.071000
2022-05-17,0.015000
2023-07-13,0.103000
2026-05-15,0.105000