f/overrides/event-backup/dfe-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
2016-06-20,1.505000
2020-09-22,0.250000
2021-03-25,0.147000
2020-12-21,0.329000
2022-03-25,0.190000
2019-03-26,0.155000
2023-09-25,0.540000
2007-12-17,4.217000
2009-03-23,0.211000
2012-03-26,0.113000
2016-12-23,0.447000
2024-12-31,0.141000
2026-03-26,0.030000
2011-12-21,0.150000
2014-06-23,1.078000
2015-09-21,0.250000
2020-06-23,0.555000
2023-03-27,0.525000
2025-09-25,0.470000
2011-03-21,0.256000
2011-09-26,0.192000
2012-12-24,0.264000
2017-09-26,0.405000
2026-06-25,1.580000
2009-12-21,0.160000
2014-03-24,0.022000
2018-09-25,0.424000
2022-09-26,0.575000
2025-06-25,1.540000
2018-06-25,1.805000
2018-12-24,0.329000
2022-06-24,2.025000
2022-12-23,0.406000
2025-12-26,0.898000
2009-09-21,0.214000
2010-09-20,0.169000
2021-09-24,0.435000
2021-12-27,0.221000
2024-03-22,0.215000
2008-12-22,2.793000
2011-06-22,1.465000
2013-09-23,0.120000
2023-12-28,0.086000
2018-03-20,0.095000
2019-12-23,0.352000
2017-12-26,0.301000
2010-06-28,0.697000
2013-03-22,0.017000
2014-12-19,0.175000
2015-06-22,1.078000
2010-03-29,0.094000
2012-06-25,0.959000
2013-06-24,1.175000
2020-03-24,0.435000
2024-12-26,0.672000
2017-06-26,1.080000
2019-06-24,1.395000
2021-06-24,1.105000
2023-06-26,1.530000
2009-06-22,0.713000
2012-09-24,0.135000
2014-09-22,0.261000
2015-12-21,0.229000
2024-06-25,1.315000
2024-09-25,0.445000
2025-03-26,0.240000
2013-12-24,0.068000
2016-09-26,0.260000
2006-12-21,0.469000
2019-09-24,0.315000
2023-12-22,0.285000