f/overrides/event-backup/cpdix-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
2024-12-20,0.703000
2013-12-23,0.296000
2015-12-22,0.597000
2017-06-27,0.351000
2019-06-26,0.412000
2020-12-21,0.261000
2022-12-21,0.194000
2016-12-22,0.285000
2019-12-20,0.585000
2023-06-28,0.380000
2024-06-26,0.020000
2025-12-19,0.865000
2014-06-26,0.312000
2018-06-27,0.657000
2019-03-27,0.041000
2023-12-21,0.302000
2015-06-26,0.492000
2017-12-21,0.693000
2020-06-26,0.577000
2021-12-22,1.047000
2026-06-26,0.683000
2014-12-22,1.001000
2016-06-28,0.341000
2018-12-21,0.567000
2022-06-28,0.626000
2025-06-26,0.550000
2021-06-28,0.849000