f/overrides/event-backup/ffa-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
2023-09-22,0.315000
2023-12-22,0.315000
2006-03-17,0.400000
2014-12-22,0.230000
2019-03-22,0.285000
2021-06-22,0.315000
2018-06-22,0.285000
2019-12-20,0.285000
2020-09-22,0.285000
2006-09-18,0.400000
2008-03-18,0.400000
2008-09-18,0.400000
2016-03-21,0.240000
2017-06-22,0.285000
2009-06-19,0.220000
2015-09-22,0.235000
2016-06-21,0.240000
2016-09-22,0.240000
2007-06-18,0.400000
2025-06-23,0.350000
2025-03-24,0.350000
2006-12-20,0.400000
2013-03-20,0.225000
2020-03-20,0.285000
2022-12-22,0.315000
2011-03-21,0.225000
2017-09-22,0.285000
2021-09-22,0.315000
2022-03-22,0.315000
2012-03-21,0.225000
2015-03-20,0.235000
2019-06-21,0.285000
2026-03-20,0.388000
2019-09-20,0.285000
2023-03-22,0.315000
2024-09-20,0.350000
2025-12-22,0.388000
2006-06-19,0.400000
2008-06-18,0.400000
2009-12-21,0.220000
2015-06-22,0.235000
2018-03-22,0.285000
2018-12-21,0.285000
2021-03-22,0.315000
2024-12-20,0.350000
2010-03-19,0.220000
2013-06-19,0.225000
2014-06-20,0.230000
2020-12-22,0.285000
2014-09-22,0.230000
2016-12-22,0.240000
2017-03-22,0.250000
2005-09-01,0.400000
2009-09-21,0.220000
2010-09-21,0.220000
2011-09-21,0.225000
2023-06-22,0.315000
2024-03-22,0.315000
2024-06-21,0.350000
2005-06-01,0.400000
2008-12-19,0.400000
2018-09-21,0.285000
2022-09-22,0.315000
2012-12-21,0.225000
2013-09-19,0.225000
2014-03-20,0.230000
2015-12-22,0.235000
2004-12-20,0.503000
2007-03-19,0.400000
2007-09-18,0.457000
2011-06-21,0.225000
2026-06-22,0.388000
2017-12-22,0.285000
2020-06-22,0.285000
2022-06-22,0.315000
2025-09-22,0.388000
2007-12-19,0.400000
2009-03-19,0.300000
2010-06-21,0.220000
2012-06-20,0.225000
2021-12-22,0.315000
2010-12-21,0.220000
2011-12-21,0.225000
2012-09-19,0.225000
2013-12-20,0.225000