f/overrides/event-backup/fdd-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
2024-09-26,0.125000
2014-03-25,0.062000
2014-12-23,0.066000
2019-06-14,0.453000
2013-06-21,0.333000
2022-06-24,0.347000
2022-09-23,0.203000
2024-06-27,0.412000
2017-06-22,0.264000
2012-09-21,0.077000
2018-06-21,0.405000
2022-03-25,0.094000
2010-12-21,0.071000
2017-03-23,0.027000
2018-03-22,0.055000
2022-12-23,0.045000
2015-09-23,0.083000
2012-03-21,0.046000
2012-06-21,0.419000
2020-03-26,0.028000
2023-09-22,0.149000
2010-06-22,0.297000
2015-03-25,0.043000
2015-12-23,0.055000
2017-12-21,0.045000
2021-03-25,0.014000
2025-06-26,0.262000
2008-12-23,0.156000
2024-03-21,0.043000
2025-12-12,0.158000
2016-12-21,0.080000
2014-09-23,0.100000
2021-09-23,0.176000
2011-09-21,0.171000
2008-06-23,0.763000
2009-06-23,0.359000
2015-06-24,0.350000
2021-06-24,0.250000
2024-12-13,0.281000
2025-03-27,0.070000
2026-03-26,0.061000
2007-12-21,0.241000
2019-12-13,0.056000
2020-09-24,0.196000
2016-09-21,0.062000
2011-12-21,0.068000
2016-06-22,0.409000
2018-09-14,0.088000
2019-03-21,0.062000
2020-06-25,0.215000
2011-06-21,0.350000
2026-06-25,0.579000
2013-03-21,0.032000
2012-12-21,0.069000
2013-09-20,0.038000
2013-12-18,0.098000
2017-09-21,0.045000
2019-09-25,0.089000
2021-12-23,0.056000
2023-03-24,0.036000
2011-03-22,0.074000
2014-06-24,0.334000
2018-12-18,0.055000
2023-06-27,0.469000
2023-12-22,0.173000
2025-09-25,0.209000
2009-09-22,0.079000
2009-12-22,0.060000
2010-09-21,0.194000
2020-12-24,0.076000
2008-09-22,0.287000