f/overrides/event-backup/ivoo-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
2015-09-21,0.457000
2016-12-20,0.279000
2022-03-24,0.183000
2024-06-28,0.371000
2024-12-23,0.596000
2013-12-20,0.415500
2015-12-17,0.222500
2016-03-21,0.125000
2017-03-22,0.063500
2017-06-28,0.205500
2017-12-19,0.297000
2019-09-26,0.287000
2022-12-20,0.413000
2025-12-22,0.427000
2018-03-26,0.117000
2019-03-25,0.123000
2022-09-28,0.423000
2023-03-24,0.206000
2024-09-27,0.360000
2012-12-24,0.362500
2014-12-22,0.612500
2018-06-28,0.227000
2020-12-22,0.392000
2021-12-21,0.379000
2025-09-24,0.385000
2026-03-24,0.350000
2010-12-27,0.090000
2016-09-20,0.239000
2017-09-27,0.212500
2025-06-26,0.351000
2021-03-26,0.159000
2021-09-29,0.317500
2022-06-23,0.270000
2023-12-20,0.444000
2016-06-21,0.117500
2018-09-26,0.272500
2019-06-27,0.269500
2019-12-16,0.355500
2020-03-10,0.133000
2020-06-25,0.241000
2023-06-29,0.276000
2011-12-23,0.237500
2018-12-13,0.258500
2020-09-11,0.191500
2021-06-24,0.233000
2023-09-28,0.249000
2024-03-22,0.231000
2025-03-25,0.346000
2026-06-24,0.345000