f/overrides/event-backup/mcn-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
2024-06-14,0.180000
2025-03-17,0.180000
2025-04-15,0.060000
2005-02-11,0.330000
2005-05-11,0.330000
2009-11-10,0.196000
2010-08-11,0.180000
2011-08-11,0.180000
2025-08-15,0.060000
2025-09-16,0.060000
2004-11-10,0.300000
2014-03-17,0.180000
2020-12-15,0.180000
2023-03-15,0.180000
2025-07-15,0.060000
2024-09-17,0.180000
2010-02-10,0.180000
2015-09-15,0.180000
2016-03-15,0.180000
2016-09-14,0.180000
2023-12-14,0.180000
2025-10-15,0.060000
2006-05-11,0.330000
2006-11-13,0.330000
2009-08-12,0.180000
2013-12-13,0.180000
2018-12-14,0.180000
2025-11-17,0.060000
2026-03-16,0.060000
2026-08-17,0.060000
2007-02-13,0.330000
2012-08-13,0.180000
2017-12-14,0.180000
2020-09-15,0.180000
2025-06-16,0.060000
2025-05-15,0.060000
2012-05-11,0.180000
2014-09-15,0.180000
2018-09-17,0.180000
2020-06-15,0.180000
2022-03-15,0.180000
2013-09-16,0.180000
2015-03-17,0.180000
2015-06-16,0.180000
2022-06-15,0.180000
2013-03-15,0.180000
2017-03-15,0.180000
2020-03-16,0.180000
2005-11-10,0.330000
2007-05-11,0.330000
2008-11-12,0.240000
2011-02-11,0.180000
2012-02-13,0.180000
2021-03-15,0.180000
2013-06-14,0.180000
2018-03-14,0.180000
2007-08-13,0.330000
2018-06-14,0.180000
2026-05-15,0.060000
2026-07-15,0.060000
2021-12-15,0.180000
2006-08-11,0.330000
2014-06-16,0.180000
2017-06-14,0.180000
2019-09-17,0.180000
2021-06-15,0.180000
2026-01-15,0.060000
2026-04-15,0.060000
2006-02-13,0.330000
2010-11-10,0.180000
2012-11-13,0.180000
2017-09-14,0.180000
2022-12-15,0.180000
2010-05-12,0.180000
2016-12-14,0.180000
2022-09-15,0.180000
2026-02-17,0.060000
2008-02-13,0.330000
2008-08-13,0.280000
2009-02-11,0.240000
2009-05-13,0.180000
2011-05-11,0.180000
2026-06-15,0.060000
2019-12-16,0.180000
2023-06-15,0.180000
2023-09-14,0.180000
2008-05-13,0.330000
2011-11-10,0.180000
2014-12-15,0.180000
2019-03-14,0.180000
2019-06-17,0.180000
2024-03-14,0.180000
2025-12-15,0.060000
2024-12-17,0.180000
2005-08-11,0.330000
2007-11-13,0.330000
2015-12-15,0.180000
2016-06-15,0.180000
2021-09-15,0.180000