f/overrides/event-backup/cowz-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
2017-09-26,0.291000
2019-06-25,0.131000
2021-12-23,0.278000
2023-03-23,0.211000
2023-06-22,0.191000
2023-09-21,0.300000
2018-06-26,0.078000
2021-03-22,0.126000
2025-09-04,0.309000
2017-03-28,0.052000
2019-12-24,0.203000
2021-06-21,0.106000
2024-09-26,0.248000
2024-12-27,0.238000
2026-03-05,0.200000
2016-12-28,0.033000
2022-03-24,0.147000
2022-06-23,0.213000
2025-06-05,0.164000
2017-12-27,0.128000
2020-03-23,0.283000
2021-09-23,0.187000
2022-12-22,0.321000
2024-06-27,0.300000
2025-03-06,0.229000
2017-06-27,0.093000
2018-09-25,0.121000
2019-03-26,0.119000
2020-09-21,0.213000
2023-12-27,0.298000
2026-06-04,0.112000
2020-06-22,0.109000
2025-12-30,0.617000
2018-03-27,0.085000
2018-12-24,0.145000
2020-12-21,0.247000
2022-09-22,0.224000
2024-03-21,0.244000