f/overrides/event-backup/fssnx-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
2012-12-14,0.034000
2014-06-06,0.072000
2014-12-19,0.321000
2016-12-16,0.104000
2017-06-09,0.155000
2013-12-13,0.126000
2015-12-18,0.267000
2016-06-10,0.085000
2018-06-08,0.077000
2019-12-13,0.345000
2021-12-10,0.726000
2013-06-07,0.052000
2015-06-05,0.144000
2017-12-15,0.357000
2018-12-14,0.622000
2012-06-08,0.050000
2021-06-04,0.007000