f/overrides/event-backup/btiix-capitalGain.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,Capital Gains
2000-03-31,0.320000
2018-12-17,33.923000
2020-06-23,6.454000
2021-12-15,26.544000
1996-12-12,3.618000
2001-12-07,1.550000
1997-12-12,4.572000
2016-06-23,1.213000
2018-06-22,1.638000
2021-06-23,2.763000
2022-12-15,18.216000
2014-12-16,7.185000
1999-06-25,0.840000
2000-12-05,13.890000
2017-06-23,4.726000
2017-12-15,24.817000
2019-12-16,18.467000
2020-12-15,29.409000
2022-06-23,1.441000
1997-09-11,0.787000
2024-12-16,27.186000
2015-12-15,11.611000
1996-09-12,0.384000
1999-12-06,1.345000
2024-06-21,2.319000
1998-12-04,2.610000
2023-12-15,37.130000
2016-12-15,18.783000
2019-06-21,5.650000
2023-06-23,0.614000
2015-03-24,2.331000