f/overrides/event-backup/csvax-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
2015-12-16,0.105000
2023-06-21,0.129000
2013-09-24,0.175000
2024-09-20,0.135000
2020-12-17,0.395000
2015-06-23,0.140000
2019-12-18,0.232000
2024-12-18,0.902000
2015-03-20,0.140000
2014-06-24,0.150000
2024-06-21,0.134000
2004-12-15,0.246000
2014-03-21,0.113000
2017-12-18,0.196000
2021-12-20,1.456000
2023-09-21,0.163000
2009-12-07,0.074000
2014-09-24,0.150000
2016-03-23,0.100000
2018-09-21,0.134000
2019-09-20,0.144000
2020-09-22,0.023000
2022-03-18,0.054000
2022-06-21,0.095000
2013-12-17,0.924000
2025-03-20,0.092000
2026-03-19,0.112000
2021-06-18,0.124000
2006-09-20,2.720000
2018-06-21,0.122000
2021-09-21,0.168000
2023-12-19,0.260000
2005-12-15,1.659000
2019-03-20,0.106000
2006-12-11,0.058000
2007-12-10,2.277000
2012-12-07,1.590000
2014-12-16,2.288000
2025-06-20,0.151000
2025-12-17,0.571000
2003-12-12,0.070000
2015-09-22,0.093000
2016-09-22,0.104000
2017-09-21,0.116000
2020-06-17,0.111000
2025-09-19,0.256000
2008-12-08,0.056000
2017-06-22,0.110000
2023-03-20,0.099000
2017-03-22,0.105000
2016-12-19,0.239000
2024-03-20,0.078000
2026-06-18,0.155000
2011-12-06,0.052000
2018-03-21,0.103000
2018-12-18,0.486000
2020-03-20,0.130000
2022-09-21,0.082000
2022-12-19,0.056000
2013-06-24,0.191000
2016-06-23,0.105000
2019-06-17,0.140000
2021-03-18,0.053000
2013-03-22,0.089000
2012-09-25,0.125000