f/overrides/event-backup/mrgax-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
2006-12-12,1.386000
2018-12-11,2.977000
2025-12-16,6.792000
2008-12-11,0.085000
2015-12-10,2.730000
2016-12-13,0.971000
1998-12-10,0.631000
2002-01-31,0.261000
2007-12-11,1.465000
2014-12-11,2.276000
2017-12-12,2.106000
2023-12-12,1.152000
1997-03-27,0.009000
2010-04-30,0.013000
2012-12-11,0.108000
2020-12-08,0.627000
1997-06-26,0.020000
1999-12-10,1.334000
2019-12-10,0.636000
2021-12-07,3.462000
2022-12-06,1.452000
2024-12-17,4.150000
1997-12-23,0.545000
2010-12-09,0.109000
2013-12-10,0.168000
1996-12-23,0.073000
1997-09-26,0.025000
2009-12-10,0.122000
2005-12-08,0.803000
2011-12-08,0.103000