f/overrides/event-backup/irfax-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
2019-12-04,1.037000
2025-12-08,0.385000
2011-06-30,0.137000
2011-12-15,0.096000
2007-12-31,1.160000
2014-12-11,0.263000
2015-06-30,0.107000
2016-06-30,0.128000
2022-06-30,0.120000
2012-06-29,0.131000
2015-01-02,0.100000
2015-12-10,0.112000
2018-12-06,0.237000
2023-12-07,0.089000
2025-06-30,0.147000
2026-06-30,0.131000
2013-12-12,0.293000
2010-06-30,0.143000
2012-12-13,0.602000
2020-12-10,0.285000
2023-06-30,0.118000
2006-12-22,0.499000
2009-12-17,0.777000
2014-06-30,0.110000
2024-06-28,0.123000
2007-06-29,0.135000
2008-06-30,0.144000
2016-12-08,0.487000
2019-06-28,0.151000
2021-12-09,0.539000
2006-06-23,0.088000
2010-12-16,0.608000
2013-06-28,0.134000
2017-06-30,0.135000
2017-12-06,0.235000
2018-06-29,0.186000
2020-06-30,0.082000
2021-06-30,0.342000
2009-06-30,0.099000
2024-12-04,0.100000
2022-12-08,0.077000