f/overrides/event-backup/fta-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
2017-06-22,0.210000
2019-03-21,0.162000
2020-03-26,0.215000
2020-12-24,0.360000
2014-03-25,0.155000
2015-03-25,0.130000
2016-09-21,0.192000
2020-09-24,0.261000
2021-03-25,0.173000
2024-12-13,0.453000
2007-12-21,0.252000
2008-12-23,0.278000
2021-10-01,0.049000
2025-06-26,0.309000
2017-03-23,0.159000
2017-12-21,0.274000
2015-12-23,0.252000
2022-09-23,0.343000
2024-06-27,0.330000
2026-06-25,0.339000
2020-06-25,0.278000
2024-03-21,0.309000
2013-03-21,0.107000
2018-06-21,0.297000
2019-12-13,0.302000
2021-09-23,0.284000
2023-03-24,0.286000
2018-09-14,0.189000
2021-12-23,0.353000
2015-06-24,0.201000
2023-09-22,0.412000
2025-03-27,0.395000
2012-06-21,0.177000
2012-12-21,0.291000
2016-03-23,0.142000
2018-03-22,0.209000
2022-12-23,0.532000
2023-12-22,0.490000
2021-06-24,0.216000
2024-09-26,0.453000
2008-06-23,0.190000
2009-06-23,0.192000
2011-12-21,0.223000
2015-09-23,0.205000
2018-12-18,0.361000
2019-06-14,0.160000
2011-06-21,0.155000
2013-06-21,0.169000
2014-09-23,0.197000
2014-12-23,0.240000
2026-03-26,0.362000
2009-12-22,0.160000
2017-09-21,0.194000
2025-09-25,0.401000
2025-12-12,0.523000
2010-06-22,0.177000
2013-09-20,0.155000
2013-12-18,0.183000
2016-06-22,0.185000
2019-09-25,0.438000
2023-06-27,0.301000
2010-12-21,0.159000
2014-06-24,0.190000
2016-12-21,0.211000
2022-03-25,0.268000
2022-06-24,0.273000