f/overrides/event-backup/dbem-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
2017-06-21,0.032000
2017-12-19,0.331000
2012-06-21,0.227000
2014-12-19,0.445000
2015-12-16,0.313000
2021-06-25,0.233000
2025-06-20,0.167000
2013-06-27,0.376000
2019-12-18,0.435000
2022-06-24,0.272000
2023-12-15,0.288000
2024-12-20,0.434000
2011-12-20,0.646000
2020-12-18,0.373000
2019-06-28,0.181000
2015-06-24,0.325000
2022-12-16,0.295000
2024-06-21,0.183000
2013-12-20,0.054000
2023-06-23,0.301000
2016-06-21,0.124000
2018-12-19,0.596000
2021-12-17,0.236000
2025-12-19,0.419000
2012-12-19,0.423000
2020-06-26,0.106000
2026-06-18,0.412000
2016-12-21,0.182000