f/overrides/event-backup/arcvx-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
2016-12-29,0.385000
2018-12-27,0.845000
2019-12-30,0.950000
2020-12-29,0.786000
2023-12-21,0.338000
2009-12-30,0.125000
2010-12-30,0.153000
2014-12-30,0.527000
2024-12-20,0.599000
2025-12-19,1.542000
2012-12-28,0.274000
2013-12-30,0.345000
2017-12-28,0.154000
2021-12-28,1.103000
2022-12-28,0.615000
2008-12-30,0.090000
2017-10-19,0.233000
2018-12-31,0.329000
2011-12-29,0.212000
2015-12-30,0.705000