f/overrides/event-backup/aifrx-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
2012-06-29,0.160000
2020-12-22,0.190000
2011-03-30,0.080000
2022-06-17,0.190000
2022-12-21,0.460000
2017-06-30,0.190000
2017-09-29,0.190000
2023-12-21,0.229000
2024-03-15,0.190000
2012-09-28,0.160000
2020-09-18,0.190000
2015-03-31,0.180000
2019-03-15,0.190000
2020-03-13,0.190000
2024-12-20,1.215000
2025-12-19,1.443000
2013-12-06,0.348000
2016-09-30,0.190000
2020-06-19,0.190000
2021-09-17,0.190000
2023-06-16,0.190000
2019-09-13,0.190000
2011-09-29,0.160000
2012-12-31,0.160000
2017-03-31,0.190000
2017-12-15,0.072000
2017-12-29,0.190000
2011-06-29,0.160000
2013-06-28,0.170000
2019-06-14,0.190000
2022-03-18,0.190000
2025-06-20,0.190000
2025-09-19,0.190000
2012-03-30,0.160000
2014-12-05,0.190000
2016-12-30,0.190000
2021-03-19,0.190000
2022-09-16,0.190000
2013-12-31,0.183000
2025-03-21,0.190000
2013-09-30,0.170000
2019-12-20,0.333000
2021-12-22,0.451000
2010-12-30,1.145000
2013-03-28,0.160000
2016-06-30,0.190000
2018-06-29,0.190000
2014-03-31,0.170000
2015-09-30,0.190000
2015-12-31,0.190000
2018-03-29,0.190000
2018-12-20,0.153000
2021-06-18,0.190000
2014-06-30,0.180000
2014-09-30,0.180000
2014-12-31,0.180000
2015-06-30,0.190000
2016-03-31,0.190000
2023-03-17,0.190000
2023-09-15,0.190000
2024-06-21,0.190000
2024-09-20,0.190000
2009-12-23,0.202000
2011-12-29,0.160000
2018-09-14,0.190000
2026-03-20,0.190000
2026-06-18,0.190000