f/overrides/event-backup/mxigx-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
2005-12-19,0.130000
2018-09-07,0.038000
2006-12-18,0.556000
2013-12-27,0.589000
2021-12-29,0.896000
2024-12-27,0.276000
2025-09-05,0.067000
2004-12-15,0.120000
2020-12-29,0.142000
2009-12-28,0.124000
2015-12-29,0.632000
2016-09-07,0.002000
2017-12-27,0.485000
2021-09-03,0.240000
2024-09-06,0.086000
2008-12-15,0.332000
2013-09-04,0.040000
2018-12-27,1.205000
2019-09-06,0.010000
2022-09-06,0.141000
2014-12-29,0.741000
2003-12-17,0.010000
2007-12-14,0.136000
2014-09-03,0.022000
2016-12-28,0.027000
2019-12-27,0.015000
2025-12-29,0.635000