f/overrides/event-backup/cdoyx-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
2023-03-20,0.289000
2014-12-16,5.692000
2015-12-14,1.124000
2016-09-22,0.388000
2018-12-13,3.356000
2022-03-18,0.301000
2017-06-21,0.380000
2023-06-21,0.303000
2024-09-20,0.287000
2026-06-18,0.272000
2019-03-20,0.296000
2020-06-17,0.316000
2020-12-11,0.607000
2015-09-22,0.360000
2016-03-23,0.352000
2016-12-14,0.484000
2017-09-21,0.380000
2018-03-21,0.312000
2022-06-21,0.277000
2025-03-20,0.289000
2016-06-23,0.372000
2017-12-13,3.612000
2020-03-20,0.320000
2021-12-14,4.176000
2025-06-20,0.316000
2018-06-21,0.352000
2019-09-20,0.328000
2024-06-21,0.299000
2026-03-19,0.293000
2024-12-12,2.258000
2015-03-20,0.336000
2017-03-22,0.376000
2020-09-22,0.314000
2021-06-18,0.270000
2022-12-13,1.984000
2025-09-19,0.293000
2025-12-11,2.458000
2021-09-21,0.291000
2022-09-21,0.287000
2023-09-21,0.267000
2023-12-13,0.577000
2024-03-20,0.273000
2015-06-22,0.352000
2018-09-21,0.356000
2019-06-17,0.300000
2019-12-13,3.656000
2021-03-18,0.275000