f/overrides/event-backup/asfyx-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
2012-12-24,0.055,2017-10-31 12:21:33
2010-12-31,0.739,2017-10-31 12:21:33
2011-12-30,0.321,2017-10-31 12:21:33
2014-12-29,1.407,2017-10-31 12:21:33
2015-12-29,0.129,2017-10-31 12:21:33
2014-04-08,0.095,2017-10-31 12:21:33
2012-04-10,0.06,2017-10-31 12:21:33
2015-04-08,0.397,2017-10-31 12:21:33
2019-12-30,0.457,2020-04-15 13:22:12
2019-03-29,0.012,2020-04-15 13:22:12
2014-12-29,1.407,2020-04-15 13:22:12
2015-12-29,0.129,2020-04-15 13:22:12
2017-12-28,0.007,2020-04-15 13:22:12
2012-12-24,0.055,2020-04-15 13:22:12
2019-04-30,0.028,2020-04-15 13:22:12
2018-04-10,0.118,2020-04-15 13:22:12
2010-12-31,0.739,2020-04-15 13:22:12
2011-12-30,0.321,2020-04-15 13:22:12
2014-04-08,0.095,2020-04-15 13:22:12
2012-04-10,0.06,2020-04-15 13:22:12
2015-04-08,0.397,2020-04-15 13:22:12
2019-02-28,0.019,2020-04-15 13:22:12