f/overrides/event-backup/igro-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
2022-12-13,0.244000
2017-03-24,0.317000
2019-12-16,0.230000
2021-03-25,0.395000
2022-06-09,0.576000
2026-03-17,0.297000
2016-12-21,0.157000
2017-09-26,0.220000
2020-09-23,0.374000
2024-09-25,0.403000
2016-06-21,0.182000
2018-12-18,0.222000
2021-06-10,0.563000
2021-09-24,0.302000
2023-09-26,0.443000
2016-09-26,0.239000
2018-03-22,0.290000
2018-09-26,0.229000
2020-12-14,0.325000
2023-03-23,0.245000
2023-06-07,0.659000
2023-12-20,0.456000
2025-09-16,0.433000
2017-12-21,0.307000
2019-06-17,0.744000
2021-12-13,0.280000
2022-03-24,0.322000
2022-09-26,0.376000
2024-03-21,0.299000
2017-06-20,0.597000
2019-03-20,0.345000
2019-09-24,0.277000
2020-06-15,0.452000
2025-03-18,0.272000
2025-12-15,0.497000
2026-06-15,1.194000
2018-06-19,0.722000
2022-12-29,0.034000
2024-06-11,0.626000
2024-12-17,0.329000
2020-03-25,0.371000
2025-06-16,0.874000