f/overrides/event-backup/csjzx-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
2020-12-10,0.521000
2025-03-31,0.443000
2019-09-30,0.419000
2020-03-31,0.393000
2022-09-30,0.463000
2025-12-08,0.481000
2026-03-31,0.470000
2020-09-30,0.344000
2022-06-30,1.354000
2024-09-30,0.386000
2026-06-30,0.558000
2019-12-18,0.435000
2020-06-30,1.652000
2021-12-09,2.360000
2023-09-29,0.411000
2025-09-30,0.465000
2021-03-31,0.278000
2021-06-30,0.288000
2024-12-04,0.509000
2025-06-30,0.622000
2019-11-05,4.871000
2023-06-30,0.496000
2022-12-08,2.245000
2023-12-07,0.912000
2024-03-28,0.446000
2024-06-28,0.517000
2021-09-30,0.346000
2022-03-31,0.369000
2023-03-31,0.430000