f/overrides/event-backup/ees-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
2022-12-23,0.202000
2024-03-22,0.145000
2020-09-22,0.090000
2019-03-26,0.090000
2024-06-25,0.205000
2007-03-26,0.013333
2010-09-20,0.036667
2011-12-21,0.066000
2012-06-25,0.063000
2015-09-21,0.078333
2024-09-25,0.180000
2025-03-26,0.130000
2010-06-28,0.041333
2014-03-24,0.049333
2016-09-26,0.096667
2017-09-26,0.080000
2018-09-25,0.113000
2019-12-23,0.148000
2023-12-22,0.155000
2010-12-22,0.076333
2013-06-24,0.050667
2015-03-23,0.085667
2017-12-26,0.102000
2021-06-24,0.130000
2022-09-26,0.160000
2023-06-26,0.160000
2007-12-17,0.047667
2016-06-20,0.098333
2020-03-24,0.135000
2012-03-26,0.071000
2014-12-19,0.078333
2015-06-22,0.074000
2012-12-24,0.199667
2009-09-21,0.013333
2020-12-30,0.030000
2023-12-28,0.008000
2024-12-26,0.179000
2024-12-31,0.032000
2025-09-25,0.205000
2009-03-23,0.022667
2017-06-26,0.070000
2025-06-25,0.200000
2025-12-26,0.200000
2008-06-23,0.066333
2018-12-24,0.168000
2019-06-24,0.135000
2021-12-27,0.506000
2017-03-27,0.085000
2016-03-21,0.048667
2012-09-24,0.060333
2020-06-23,0.100000
2021-03-25,0.073000
2008-12-22,0.054667
2011-06-22,0.047000
2013-03-22,0.035333
2013-12-24,0.075333
2015-12-21,0.109667
2016-12-23,0.088667
2018-06-25,0.208000
2022-06-24,0.115000
2007-06-25,0.034667
2014-09-22,0.070667
2021-09-24,0.160000
2011-03-21,0.050333
2009-06-22,0.015667
2009-12-21,0.022333
2010-03-29,0.032000
2011-09-26,0.053333
2013-09-23,0.050667
2018-03-20,0.090000
2020-12-21,0.148000
2008-09-22,0.035333
2026-03-26,0.110000
2026-06-25,0.255000
2023-09-25,0.150000
2008-03-24,0.046333
2014-06-23,0.075667
2019-09-24,0.130000
2023-03-27,0.115000
2007-09-24,0.032667