f/overrides/event-backup/mdyg-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
2019-09-23,0.172000
2024-03-18,0.133000
2007-03-16,0.078000
2009-06-19,0.026000
2012-12-21,0.114667
2015-03-20,0.112333
2016-06-17,0.114333
2006-09-15,0.010000
2012-06-15,0.054667
2017-12-15,0.767667
2022-09-19,0.206000
2024-09-23,0.192000
2018-09-24,0.187000
2019-06-24,0.173000
2019-12-23,0.207000
2005-12-16,0.010000
2008-09-19,0.024667
2010-06-18,0.016000
2013-09-20,0.078667
2015-09-18,0.115000
2021-09-20,0.361000
2024-12-23,0.218000
2023-12-18,0.294000
2026-03-23,0.129000
2009-12-18,0.042667
2011-09-16,0.037667
2017-06-16,0.129667
2019-03-18,0.139000
2023-09-18,0.213000
2010-03-19,0.013000
2012-03-16,0.043333
2013-03-15,0.045000
2022-06-21,0.185000
2008-03-20,0.029000
2011-12-16,0.052667
2013-06-21,0.113333
2017-03-17,0.118667
2023-03-20,0.170000
2015-12-18,0.631333
2016-12-16,0.193000
2021-03-22,0.089000
2026-06-22,0.150000
2010-12-17,0.022000
2014-06-20,0.074667
2016-09-16,0.140000
2020-03-23,0.111000
2025-03-24,0.148000
2009-09-18,0.020000
2012-09-21,0.062667
2020-06-22,0.126000
2021-06-21,0.112000
2007-06-15,0.011667
2015-06-19,0.113667
2016-03-18,0.107667
2018-06-18,0.146000
2022-03-21,0.134000
2006-03-17,0.014333
2009-03-20,0.027000
2010-09-17,0.022667
2023-06-20,0.227000
2025-12-22,0.194000
2018-03-19,0.098333
2022-12-19,0.234000
2007-09-21,0.010333
2007-12-21,0.020667
2011-03-18,0.032667
2011-06-17,0.039000
2017-09-15,0.138333
2014-09-19,0.082000
2024-06-24,0.210000
2006-12-15,0.575667
2008-06-20,0.035333
2008-12-19,0.030000
2013-12-20,0.067667
2014-03-21,0.075000
2025-06-23,0.189000
2025-09-22,0.160000
2006-06-16,0.010667
2014-12-19,0.398667
2018-12-24,0.191000
2020-09-21,0.062000
2020-12-21,0.194000