f/overrides/event-backup/abrzx-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,ctime
2010-04-29,0.025,2018-05-08 16:14:06
2014-12-12,0.903,2018-05-08 16:14:06
2015-12-11,0.71,2018-05-08 16:14:06
2013-12-13,0.914,2018-05-08 16:14:06
2016-12-13,0.876,2018-05-08 16:14:06
2012-12-07,0.641,2018-05-08 16:14:06
2017-12-13,0.697,2018-05-08 16:14:06
2009-12-11,0.554,2018-05-08 16:14:06
2010-12-10,0.668,2018-05-08 16:14:06
2011-12-09,0.456,2018-05-08 16:14:06