f/overrides/event-backup/fslbx-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
2003-04-04,0.060000
2015-12-18,3.428000
2020-12-18,1.645000
1990-06-08,0.010000
1993-04-02,0.010000
1996-12-06,0.290000
1998-04-03,0.530000
2004-12-17,0.180000
1999-04-01,0.380000
2010-04-09,0.050000
2022-04-08,0.561000
2024-04-12,0.042000
2002-12-20,0.220000
2003-12-19,0.100000
2009-12-11,0.120000
2018-04-06,3.931000
2019-12-20,2.217000
2007-12-14,4.310000
2015-04-10,0.654000
2017-12-15,4.443000
1996-04-04,0.420000
1997-04-04,0.050000
2000-04-07,0.920000
2000-12-22,5.570000
2001-12-21,0.050000
2026-04-10,2.451000
1995-04-13,0.490000
1999-12-17,2.800000
2016-12-16,0.845000
2020-04-08,1.298000
2025-04-11,0.053000
1988-06-30,0.010000
1991-06-07,0.010000
2007-04-13,2.340000
1986-07-14,0.015000
1987-12-16,1.180000
2010-12-30,0.070000
2022-12-16,1.673000
2025-12-26,1.225000
1997-12-19,0.650000
2002-12-30,0.010000
2005-12-16,3.620000
2009-12-30,0.040000
2018-12-14,1.994000
1993-12-03,1.470000
2005-04-15,0.020000
2011-12-09,0.526000
2019-04-05,1.216000
2023-12-21,1.649000
2024-12-26,1.213000
1995-12-08,0.990000
2004-04-02,0.060000
2006-04-13,2.740000
2010-12-10,0.190000
2014-04-11,0.202000
1988-12-16,0.080000
2021-04-09,1.006000
1990-12-14,0.080000
2006-12-15,6.500000
2017-04-07,1.245000
2021-12-17,0.827000
1989-06-16,0.050000
2001-04-06,3.480000
2009-04-17,0.090000
2012-12-21,1.119000
2014-12-22,2.355000
1989-12-13,0.110000
2008-04-11,2.730000
2008-12-12,0.710000
2013-12-20,0.404000