f/overrides/event-backup/aaaax-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
2016-12-19,0.017000
2019-06-21,0.135000
2012-12-28,0.188000
2013-12-30,0.078000
2017-12-19,0.049000
2020-12-17,0.083000
2023-12-19,0.185000
2013-06-21,0.036000
2014-12-30,0.219000
2018-12-19,0.058000
2021-06-23,0.147000
2025-12-17,0.206000
2008-06-23,0.107000
2010-12-30,0.041000
2017-06-23,0.097000
2020-06-23,0.062000
2022-12-19,0.144000
2023-06-23,0.051000
2024-12-18,0.232000
2026-06-23,0.597000
2008-12-30,0.383000
2009-12-30,0.200000
2011-06-23,0.101000
2011-12-29,0.256000
2015-06-23,0.056000
2025-06-23,0.244000
2009-06-23,0.094000
2012-06-22,0.007000
2015-12-30,0.122000
2016-06-23,0.107000
2021-12-17,0.156000
2024-06-21,0.053000
2007-12-28,0.247000
2010-06-23,0.071000
2014-06-23,0.056000
2018-06-22,0.086000
2019-12-18,0.057000
2022-06-23,0.329000