f/overrides/event-backup/iqdy-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
2018-03-19,0.116000
2020-06-19,0.256000
2020-12-18,0.089000
2021-09-17,0.369000
2014-03-21,0.159000
2015-03-20,0.062000
2015-06-19,0.409000
2016-06-20,0.431000
2024-09-20,0.266000
2025-09-19,0.328000
2022-06-17,0.656000
2022-09-16,0.355000
2023-12-15,0.812000
2016-09-19,0.271000
2017-03-20,0.110000
2018-06-18,0.530000
2020-03-20,0.139000
2017-06-19,0.407000
2024-12-20,1.205000
2021-06-18,0.325000
2025-06-20,0.522000
2025-12-19,0.226000
2013-06-03,0.265000
2014-12-29,0.386000
2017-09-18,0.228000
2019-06-21,0.430000
2018-12-21,0.285000
2020-09-18,0.254000
2023-06-16,0.521000
2026-06-18,0.595000
2013-12-27,0.143000
2014-06-20,0.410000
2016-12-22,0.095000
2017-12-21,0.276000
2025-03-21,0.120000
2013-09-03,0.243000
2018-09-24,0.365000
2019-12-20,0.164000
2023-03-17,0.051000
2022-12-16,0.177000
2023-09-15,0.416000
2015-09-18,0.202000
2015-12-29,0.243000
2019-09-20,0.329000
2021-12-17,0.364000
2024-06-21,0.452000
2026-03-20,0.115000
2014-09-19,0.123000
2019-03-15,0.099000
2021-03-19,0.120000
2022-03-18,0.144000