f/overrides/event-backup/fyx-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
2014-06-24,0.058000
2014-12-23,0.106000
2012-12-21,0.265000
2013-12-18,0.064000
2017-12-21,0.183000
2018-03-22,0.087000
2010-06-22,0.039000
2012-06-21,0.125000
2015-12-23,0.137000
2016-09-21,0.094000
2010-12-21,0.078000
2017-06-22,0.111000
2018-06-21,0.167000
2022-12-23,0.330000
2025-12-12,0.371000
2016-12-21,0.257000
2018-09-14,0.093000
2021-09-23,0.183000
2024-06-27,0.373000
2016-03-23,0.070000
2017-03-23,0.030000
2023-09-22,0.215000
2024-03-21,0.123000
2007-12-21,0.040000
2009-06-23,0.034000
2013-06-21,0.055000
2023-12-22,0.408000
2026-06-25,0.437000
2011-12-21,0.044000
2016-06-22,0.083000
2021-06-24,0.174000
2009-12-22,0.032000
2019-03-21,0.056000
2025-09-25,0.269000
2015-09-23,0.066000
2019-06-14,0.191000
2024-12-13,0.622000
2013-09-20,0.029000
2017-09-21,0.044000
2020-06-25,0.142000
2021-12-23,0.503000
2022-09-23,0.148000
2015-03-25,0.103000
2019-09-25,0.178000
2023-03-24,0.218000
2023-06-27,0.278000
2008-06-23,0.035000
2011-06-21,0.016000
2022-06-24,0.156000
2025-06-26,0.082000
2021-03-25,0.102000
2026-03-26,0.203000
2013-03-21,0.022000
2014-03-25,0.063000
2014-09-23,0.056000
2019-12-13,0.303000
2020-09-24,0.137000
2020-12-24,0.217000
2008-12-23,0.063000
2015-06-24,0.082000
2018-12-18,0.237000
2022-03-25,0.112000
2024-09-26,0.516000