f/overrides/event-backup/iqdf-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
2015-06-19,0.441000
2019-06-21,0.460000
2023-06-16,0.440000
2024-06-21,0.383000
2025-09-19,0.287000
2026-06-18,0.515000
2022-09-16,0.343000
2024-12-20,0.948000
2013-12-27,0.154000
2014-09-19,0.227000
2015-09-18,0.250000
2016-06-20,0.328000
2017-06-19,0.417000
2019-03-15,0.132000
2017-09-18,0.243000
2020-12-18,0.114000
2022-03-18,0.159000
2022-12-16,0.195000
2015-12-29,0.156000
2016-12-22,0.179000
2021-09-17,0.345000
2021-12-17,0.266000
2013-06-03,0.122000
2013-09-03,0.157000
2014-03-21,0.139000
2017-03-20,0.095000
2018-09-24,0.364000
2021-06-18,0.325000
2023-09-15,0.354000
2023-12-15,0.572000
2020-03-20,0.176000
2020-06-19,0.230000
2015-03-20,0.072000
2016-03-21,0.095000
2018-06-18,0.506000
2018-12-21,0.243000
2019-09-20,0.302000
2019-12-20,0.189000
2021-03-19,0.120000
2022-06-17,0.457000
2025-06-20,0.444000
2025-12-19,0.173000
2026-03-20,0.068000
2014-06-20,0.520000
2020-09-18,0.244000
2023-03-17,0.045000
2014-12-29,0.188000
2016-09-19,0.242000
2017-12-21,0.287000
2018-03-19,0.102000
2024-09-20,0.232000
2025-03-21,0.090000