f/overrides/event-backup/gwx-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
2012-12-21,0.493000
2015-06-19,0.065000
2019-12-23,0.678000
2021-12-20,0.665000
2024-12-23,0.392000
2014-06-20,0.134000
2017-12-15,1.839000
2018-06-15,0.079000
2018-12-24,0.741000
2021-06-21,0.372000
2025-06-23,0.490000
2010-12-17,0.495000
2013-06-21,0.201000
2015-12-18,0.688000
2020-06-22,0.329000
2007-12-21,0.821000
2009-06-19,0.200000
2011-06-17,0.134000
2014-12-19,3.560000
2009-12-18,0.177000
2011-12-16,0.685000
2016-12-16,1.169000
2020-12-21,0.288000
2025-12-22,0.668000
2013-12-20,0.827000
2016-06-17,0.052000
2023-06-20,0.476000
2024-06-24,0.449000
2026-06-22,0.526000
2010-06-18,0.233000
2012-06-15,0.271000
2022-06-21,0.415000
2023-12-18,0.362000
2008-12-19,0.358000
2019-06-24,0.410000
2022-12-20,0.381000