f/overrides/event-backup/iastx-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
2017-12-14,0.855000
2018-09-13,0.144000
2019-06-13,0.072000
2020-09-10,0.125000
2021-09-16,0.152000
2023-09-22,0.149000
2026-03-20,0.069000
2015-12-10,1.516000
2023-12-15,0.237000
2024-09-20,0.091000
2018-12-13,0.137000
2026-06-22,0.277000
2020-03-12,0.052000
2019-09-12,0.111000
2021-03-11,0.053000
2021-06-10,0.192000
2022-12-15,3.027000
2024-06-21,0.168000
2025-09-22,0.092000
2018-10-31,3.496000
2019-12-12,1.084000
2021-12-16,2.506000
2023-03-22,0.093000
2019-03-14,0.059000
2022-03-10,0.052000
2022-09-15,0.105000
2025-03-21,0.075000
2014-12-11,5.015000
2024-12-13,1.362000
2020-06-11,0.095000
2020-12-10,0.452000
2022-06-07,0.094000
2023-06-22,0.129000
2024-03-22,0.167000
2025-06-20,0.121000
2025-12-12,1.992000
2018-06-14,0.135000