f/overrides/event-backup/msft-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
2026-08-20,0.910000
2017-11-15,0.420000
2018-08-15,0.420000
2018-11-14,0.460000
2012-05-15,0.200000
2004-11-15,3.080000
2006-11-14,0.100000
2010-08-17,0.130000
2007-05-15,0.100000
2008-11-18,0.130000
2009-11-17,0.130000
2018-02-14,0.420000
2023-08-16,0.680000
2004-08-23,0.080000
2005-05-16,0.080000
2007-02-13,0.100000
2024-05-15,0.750000
2017-08-15,0.390000
2020-05-20,0.510000
2022-11-16,0.680000
2009-08-18,0.130000
2012-08-14,0.200000
2016-11-15,0.390000
2016-02-16,0.360000
2020-02-19,0.510000
2021-02-17,0.560000
2021-05-19,0.560000
2023-02-15,0.680000
2006-02-15,0.090000
2008-05-13,0.110000
2014-08-19,0.280000
2014-02-18,0.280000
2025-05-15,0.830000
2007-08-14,0.100000
2007-11-13,0.110000
2013-02-19,0.230000
2017-05-16,0.390000
2019-02-20,0.460000
2019-05-15,0.460000
2022-02-16,0.620000
2025-08-21,0.830000
2005-02-15,0.080000
2006-05-15,0.090000
2016-08-16,0.360000
2021-11-17,0.620000
2022-05-18,0.620000
2026-02-19,0.910000
2020-08-19,0.510000
2023-05-17,0.680000
2003-02-19,0.080000
2010-02-16,0.130000
2013-05-14,0.230000
2014-05-13,0.280000
2015-08-18,0.310000
2022-08-17,0.620000
2024-11-21,0.830000
2005-11-15,0.080000
2009-02-17,0.130000
2010-05-18,0.130000
2024-08-15,0.750000
2003-10-15,0.160000
2018-05-16,0.420000
2021-08-18,0.560000
2014-11-18,0.310000
2015-11-17,0.360000
2011-11-15,0.200000
2012-02-14,0.200000
2012-11-13,0.230000
2025-02-20,0.830000
2005-08-15,0.080000
2008-08-19,0.110000
2023-11-15,0.750000
2011-02-15,0.160000
2015-05-19,0.310000
2019-11-20,0.510000
2020-11-18,0.560000
2025-11-20,0.910000
2006-08-15,0.090000
2008-02-19,0.110000
2010-11-16,0.160000
2013-08-13,0.230000
2015-02-17,0.310000
2016-05-17,0.360000
2013-11-19,0.280000
2017-02-14,0.390000
2019-08-14,0.460000
2024-02-14,0.750000
2026-05-21,0.910000
2009-05-19,0.130000
2011-05-17,0.160000
2011-08-16,0.160000