f/overrides/event-backup/chkr-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
2021-05-19,0.047000
2021-08-18,0.037000
2022-05-19,0.054000
2022-11-18,0.072000
2024-11-19,0.027000
2025-02-19,0.011000
2026-05-20,0.016000
2021-02-18,0.006000
2022-02-17,0.067000
2022-08-18,0.085000
2023-05-19,0.049000
2023-08-18,0.018000
2026-08-19,0.028000
2021-11-18,0.050000
2024-05-17,0.019000
2024-08-19,0.020000
2025-08-19,0.019000
2023-02-16,0.076000
2023-11-17,0.034000
2024-02-15,0.021000
2025-05-20,0.029000
2025-11-19,0.016000
2026-02-19,0.013000