f/overrides/event-backup/norw-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
2016-12-28,0.718000
2017-12-28,0.827000
2019-06-27,0.521000
2020-06-29,0.125000
2024-06-27,0.811000
2025-12-30,0.430000
2012-12-27,0.495000
2014-12-29,0.849000
2015-12-29,0.632000
2020-12-30,0.182000
2021-12-30,0.147000
2023-12-28,0.498000
2024-12-30,0.603000
2026-06-29,2.105000
2013-12-27,0.627000
2018-12-28,0.694000
2019-12-30,0.019000
2023-06-29,0.844000
2011-12-28,0.590000
2010-12-29,0.165000
2021-06-29,0.313000
2022-06-29,0.557000
2022-12-29,0.471000
2025-06-27,0.604000
2009-12-29,0.010000