f/overrides/event-backup/aia-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
2018-12-18,1.052000
2011-12-19,0.715000
2014-06-24,0.524000
2015-12-21,0.960000
2019-12-16,1.060000
2025-06-16,0.816000
2026-06-15,0.515000
2008-06-23,0.257000
2012-12-17,0.476000
2016-12-22,0.826000
2012-06-20,0.427000
2009-12-21,0.253000
2022-06-09,0.518000
2008-12-22,0.446000
2009-06-22,0.250000
2010-12-20,0.398000
2020-06-15,0.260000
2020-12-14,0.706000
2023-12-20,0.992000
2007-12-24,0.018000
2013-12-17,0.470000
2016-06-21,0.235000
2018-06-19,0.328000
2021-06-10,0.449000
2022-12-13,0.950000
2010-06-21,0.336000
2017-06-20,0.191000
2017-12-21,0.769000
2019-06-17,0.418000
2021-12-13,0.726000
2023-06-07,0.527000
2024-06-11,0.378000
2011-06-21,0.450000
2014-12-19,0.531000
2015-06-24,0.258000
2024-12-17,1.510000
2025-12-16,1.625000
2013-06-25,0.521000