f/overrides/event-backup/cyyyx-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
2024-12-20,0.518000
2015-12-22,0.308000
2016-06-07,0.321000
2018-12-21,0.602000
2021-12-22,2.236000
2024-06-12,0.064000
2025-06-10,0.083000
2015-06-03,0.302000
2017-12-21,0.475000
2021-06-10,0.252000
2020-12-21,1.056000
2022-12-21,0.333000
2023-06-14,0.026000
2023-12-21,0.405000
2025-12-19,0.530000
2016-12-22,0.071000
2017-06-01,0.293000
2019-12-20,0.725000
2026-06-10,0.079000
2020-06-10,0.203000
2022-06-08,0.143000
2014-12-22,0.464000
2018-06-12,0.203000
2019-06-12,0.117000