f/overrides/event-backup/dem-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
2015-09-21,1.005000
2016-06-20,0.280000
2020-09-22,0.940000
2023-03-27,0.100000
2010-06-28,0.761000
2015-12-21,0.282000
2025-09-25,0.800000
2009-03-23,0.054000
2013-06-24,0.932000
2019-12-23,0.405000
2025-12-31,0.072000
2018-12-24,0.227000
2024-03-22,0.225000
2016-12-23,0.271000
2020-12-21,0.293000
2023-06-26,0.720000
2023-09-25,1.100000
2026-03-26,0.235000
2026-06-25,0.725000
2009-09-21,0.638000
2012-03-26,0.202000
2019-06-24,0.530000
2007-12-17,0.488000
2009-06-22,0.598000
2024-09-25,1.060000
2012-12-24,0.202000
2022-09-26,1.510000
2012-09-24,0.783000
2015-06-22,0.362000
2019-09-24,1.150000
2020-03-24,0.033000
2021-06-24,0.640000
2013-09-23,0.782000
2013-12-24,0.248000
2017-06-26,0.430000
2017-09-26,0.950000
2021-12-27,0.716000
2023-12-22,0.315000
2024-12-26,0.200000
2010-12-22,0.369000
2011-09-26,0.933000
2014-03-24,0.180000
2016-09-26,0.805000
2018-06-25,0.420000
2022-12-23,0.431000
2010-03-29,0.161000
2011-03-21,0.172000
2014-12-19,0.441000
2017-12-26,0.285000
2021-09-24,0.990000
2021-12-30,0.024000
2022-03-25,0.370000
2024-06-25,0.635000
2025-03-26,0.420000
2020-06-23,0.465000
2021-03-25,0.175000
2009-12-21,0.169000
2011-06-22,0.923000
2012-06-25,0.697000
2013-03-22,0.130000
2018-09-25,1.147000
2025-12-26,0.413000
2008-12-22,1.902000
2010-09-20,0.646000
2011-12-21,0.250000
2014-06-23,0.439000
2014-09-22,1.263000
2019-03-26,0.105000
2022-06-24,0.760000
2025-06-25,0.575000