f/overrides/event-backup/mviix-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
2019-12-30,0.282000
2023-12-15,0.642000
2008-06-30,0.110000
2010-12-30,0.164000
2016-12-28,0.098000
2019-12-16,0.252000
2009-12-31,0.037000
2007-12-20,0.352000
2008-12-18,0.105000
2008-12-31,0.091000
2011-12-29,0.169000
2012-12-28,0.139000
2013-12-30,0.300000
2015-12-28,0.286000
2006-12-29,0.099000
2023-12-28,0.215000
2025-12-30,0.273000
2018-12-31,0.306000
2020-12-30,0.079000
2006-06-30,0.101000
2024-12-30,0.365000
2021-12-30,0.383000
2007-12-31,0.133000
2015-12-30,0.341000
2016-12-30,0.291000
2017-12-28,0.752000
2022-12-16,0.702000
2022-12-29,0.127000
2024-12-16,1.362000
2006-12-08,0.571000
2017-12-29,0.196000
2020-12-16,1.233000
2021-12-15,0.314000
2014-12-30,0.133000
2018-12-14,0.626000
2007-06-29,0.098000