f/overrides/event-backup/agizx-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
2023-06-08,0.253000
2024-12-12,0.395000
2019-09-11,0.197000
2022-12-15,0.289000
2023-12-14,0.332000
2017-03-14,0.120000
2021-06-09,0.191000
2016-09-13,0.130000
2017-06-13,0.130000
2020-09-09,0.180000
2017-09-12,0.147000
2020-06-10,0.210000
2024-06-06,0.235000
2014-03-18,0.190000
2015-09-15,0.130000
2019-06-12,0.203000
2022-09-08,0.210000
2013-06-18,0.110000
2017-12-15,0.827000
2019-12-18,1.843000
2021-09-08,0.180000
2025-09-11,0.235000
2014-09-16,0.140000
2014-12-18,1.277000
2013-12-18,0.225000
2022-06-09,0.183000
2016-12-14,0.223000
2018-06-13,0.200000
2013-09-17,0.110000
2018-03-14,0.130000
2019-03-13,0.135000
2020-12-16,0.876000
2025-03-13,0.209000
2012-09-18,0.110000
2012-12-18,0.194000
2021-03-10,0.141000
2023-03-09,0.180000
2023-09-07,0.244000
2024-03-07,0.173000
2024-09-05,0.253000
2015-03-17,0.130000
2020-03-11,0.165000
2015-12-16,1.226000
2021-12-15,2.268000
2026-03-12,0.208000
2013-03-19,0.110000
2014-06-17,0.140000
2018-12-18,2.083000
2025-06-12,0.273000
2026-06-11,0.198000
2015-06-16,0.130000
2016-03-15,0.130000
2018-09-12,0.185000
2022-03-10,0.150000
2025-12-17,0.366000
2012-06-19,0.110000
2016-06-14,0.140000