f/overrides/event-backup/btsmx-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
2016-12-08,0.858000
2012-12-11,0.110000
2014-12-11,0.754000
2019-12-10,0.628000
2013-12-18,0.949000
2017-12-12,0.167000
2021-12-14,0.739000
2022-12-13,0.854000
2024-12-12,0.547000
2012-12-31,0.024000
2020-12-15,0.148000
2019-03-07,3.430000
2023-12-12,0.183000
2025-12-16,0.504000
2015-12-10,0.875000
2018-12-11,0.285000