f/overrides/event-backup/cxse-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
2019-12-23,0.012000
2021-06-24,0.250000
2022-09-26,0.110000
2024-06-25,0.285000
2025-12-26,0.328000
2014-12-19,0.194500
2017-12-26,0.009500
2019-09-24,0.210000
2018-06-25,0.264000
2023-09-25,0.105000
2018-12-24,0.047000
2019-06-24,0.177500
2023-06-26,0.250000
2022-06-24,0.230000
2024-09-25,0.135000
2014-06-23,0.157000
2020-12-21,0.049000
2022-03-25,0.155000
2014-09-22,0.243000
2021-12-27,0.039000
2026-06-25,0.090000
2013-06-24,0.339000
2018-09-25,0.142500
2022-12-23,0.042000
2025-09-25,0.140000
2026-03-26,0.020000
2013-09-23,0.382500
2016-06-20,0.105000
2017-06-26,0.225000
2020-06-23,0.205000
2020-09-22,0.102500
2021-09-24,0.140000
2023-12-22,0.125000
2024-12-26,0.089000
2015-12-21,0.040500
2016-09-26,0.230000
2017-09-26,0.070000
2025-06-25,0.315000