f/overrides/event-backup/montx-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
2004-12-30,0.013000
2024-11-14,1.751000
1990-12-31,0.103000
1992-12-31,0.569000
2000-12-29,0.110000
2016-11-21,0.477000
1987-12-31,0.061000
1991-09-30,0.050000
1997-10-31,2.750000
1995-10-31,3.000000
2014-11-26,2.117000
2015-11-25,2.024000
2016-12-28,0.002000
2025-11-14,6.294000
1987-06-30,0.089000
1989-12-29,0.023000
1994-09-15,0.060000
2018-11-29,1.569000
1986-12-31,0.110000
1989-11-30,0.108000
2017-11-16,1.254000
1988-12-30,0.073000
2000-11-29,6.890000
2017-12-28,0.009000
2022-11-16,1.547000
1989-06-30,0.088000
1992-06-30,0.030000
2013-12-30,1.588000
1998-10-29,0.652000
2012-11-29,0.238000
2020-11-19,1.093000
2021-11-18,3.586000
1993-09-30,0.180000
1993-12-31,0.350000
1995-12-29,0.028000