f/overrides/event-backup/nefjx-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
1999-12-13,1.929000
2000-08-28,1.857000
2011-04-12,0.889000
2012-12-21,1.129000
2013-12-20,3.330000
2025-12-23,1.202000
2008-04-14,0.027000
2024-12-23,0.277000
2012-04-10,0.267000
2015-04-08,0.310000
2020-04-08,0.091000
2016-12-22,1.134000
2018-04-10,0.539000
2009-12-17,0.039000
2010-12-28,4.771000
2011-12-27,3.335000
2013-04-09,0.513000
2014-04-08,0.692000
2015-12-23,2.590000
2019-04-10,0.012000
2019-12-20,0.096000
2022-12-23,0.533000
2023-12-21,0.055000
2010-04-30,0.064000
2017-04-07,0.705000
2021-12-23,3.804000
2022-04-05,0.372000
2026-04-08,0.479000
1998-09-15,0.020000
1999-09-14,0.256000
2017-12-21,1.577000
1997-12-23,0.475000
2000-12-18,2.472000
2014-12-22,2.887000
2016-04-07,0.335000
2018-12-20,2.948000
2020-12-22,0.002000