f/overrides/event-backup/memax-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
2006-12-18,2.832000
2004-12-16,0.026000
2014-12-16,0.867000
2022-12-08,0.278000
1996-12-23,0.231000
2011-12-15,0.143000
2015-12-15,0.033000
2023-12-19,0.750000
2003-12-17,0.150000
1998-12-17,0.093000
2012-12-13,0.254000
2016-12-15,0.137000
2019-12-12,0.582000
1996-06-10,0.001000
2010-12-16,0.072000
2020-12-10,0.204000
2025-12-16,1.055000
2009-12-17,0.300000
2013-12-12,0.121000
2018-12-13,0.140000
2021-12-09,0.699000
2007-12-13,5.652000
2024-12-17,0.791000
1996-03-29,0.002000
1997-12-23,0.245000
2005-12-15,2.297000
2008-12-16,3.109000
2017-12-14,0.030000
1995-12-28,0.015000