f/overrides/event-backup/mamax-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
2013-09-25,0.039000
2023-03-23,0.032000
2022-03-24,0.017000
2025-09-25,0.086000
2004-12-30,0.208000
2017-06-28,0.035000
2010-12-28,0.288000
2011-03-24,0.040000
2011-12-27,0.164000
2018-12-27,0.843000
2019-03-27,0.034000
2012-06-26,0.067000
2018-09-26,0.061000
2020-12-29,0.640000
2022-12-28,0.589000
2024-09-26,0.102000
2024-12-26,1.110000
2013-06-26,0.052000
2020-03-26,0.036000
2024-03-26,0.051000
2003-12-30,0.133000
2012-03-22,0.005000
2016-06-28,0.022000
2024-06-25,0.075000
2023-06-22,0.052000
2025-06-26,0.070000
2008-12-26,0.435000
2009-12-28,0.338000
2012-12-27,0.151000
2015-12-29,0.809000
2017-12-27,0.682000
2018-03-27,0.029000
2021-12-28,1.094000
2026-06-25,0.071000
2012-09-25,0.079000
2013-12-27,0.140000
2014-06-26,0.056000
2016-12-28,0.352000
2017-09-27,0.046000
2021-06-24,0.032000
2019-06-26,0.045000
2020-09-24,0.040000
2021-09-23,0.046000
2005-12-29,0.361000
2011-09-27,0.094000
2014-12-29,0.231000
2015-06-25,0.036000
2015-09-28,0.037000
2016-03-29,0.018000
2025-03-25,0.053000
2026-03-26,0.052000
2011-06-23,0.050000
2017-03-29,0.033000
2019-09-26,0.055000
2022-09-22,0.065000
2023-09-21,0.078000
2018-06-27,0.048000
2020-06-25,0.041000
2022-06-23,0.051000
2014-03-27,0.039000
2015-03-26,0.026000
2019-12-26,0.708000
2025-12-23,1.348000
2007-12-28,0.775000
2014-09-25,0.045000
2016-09-27,0.046000
2006-12-27,0.501000
2013-03-27,0.036000
2021-03-25,0.025000
2023-12-27,0.595000