f/overrides/event-backup/mresx-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
2012-12-26,0.283000
2016-06-27,0.027000
2020-03-27,0.067000
2017-12-27,1.022000
2019-12-16,0.534000
2012-09-25,0.018000
2023-06-28,0.070000
2011-12-27,0.010000
2021-09-28,0.048000
2005-01-13,0.096000
2005-03-28,0.030000
2005-06-27,0.080000
2024-06-26,0.083000
2025-03-27,0.062000
2025-06-26,0.091000
2003-09-30,0.110000
2006-06-27,0.010000
2010-09-27,0.010000
2018-09-26,0.048000
2021-12-15,0.410000
2009-09-25,0.020000
2017-09-26,0.025000
2025-09-26,0.076000
2000-12-29,0.120000
2001-03-30,0.050000
2004-09-30,0.150000
2020-06-26,0.047000
2006-03-28,0.010000
2006-09-26,0.015000
2011-03-28,0.010000
2015-12-28,1.172000
2018-03-27,0.049000
1999-12-29,0.140000
2009-06-25,0.025000
2010-04-30,0.011000
2000-06-30,0.128000
2007-09-25,0.025000
2012-06-26,0.017000
2000-09-29,0.086000
2003-03-31,0.160000
2005-09-27,0.140000
2024-03-27,0.052000
1998-10-27,0.140000
2015-09-25,0.056000
2022-12-28,0.045000
2026-06-25,0.090000
2002-09-30,0.160000
2012-03-27,0.035000
2025-12-29,0.014000
2013-03-25,0.023000
2014-09-25,0.020000
2008-06-25,0.020000
2023-03-29,0.038000
2001-09-28,0.050000
2010-06-25,0.010000
2008-03-26,0.036000
2008-12-26,0.079000
2010-03-26,0.015000
2004-03-31,0.100000
2006-12-26,2.330000
2007-03-27,0.057000
2019-03-27,0.049000
2020-12-16,0.058000
2019-06-26,0.051000
2015-03-26,0.042000
2018-12-27,0.132000
2024-12-27,0.063000
2026-03-26,0.075000
2008-09-25,0.020000
2009-12-28,0.039000
2013-06-25,0.023000
2011-06-27,0.010000
2021-06-28,0.050000
2022-12-06,0.460000
1999-03-31,0.120000
2002-03-28,0.036000
2013-12-26,0.657000
2010-12-28,0.031000
2020-09-28,0.045000
1998-12-31,0.070000
2002-12-20,0.160000
2007-12-26,3.003000
2002-06-28,0.090000
2014-03-26,0.030000
1999-06-30,0.120000
1999-09-30,0.100000
2009-03-26,0.025000
2000-03-31,0.094000
2013-09-25,0.023000
2001-12-31,0.100000
2003-06-30,0.160000
2005-12-27,0.061000
2023-12-27,0.053000
1998-12-15,0.069000
2007-06-26,0.040000
2019-09-26,0.054000
2016-12-27,1.137000
2022-03-29,0.032000
2022-06-28,0.043000
2024-09-26,0.075000
2014-06-25,0.030000
2014-12-26,0.458000
2015-06-25,0.042000
2016-03-28,0.056000
2017-06-27,0.018000
2018-06-27,0.066000
2004-06-30,0.050000
2011-09-27,0.013000
2016-09-27,0.027000
2021-03-29,0.043000
2023-09-27,0.052000
2001-06-29,0.140000