f/overrides/event-backup/biv-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
2007-08-01,0.241000
2016-02-01,0.188000
2024-05-01,0.228000
2009-06-01,0.292000
2012-02-01,0.252000
2012-07-02,0.229000
2013-07-01,0.206000
2026-03-02,0.251000
2026-08-03,0.286000
2007-06-01,0.236000
2012-05-01,0.229000
2015-06-01,0.193000
2024-11-01,0.247000
2007-12-03,0.295000
2013-10-01,0.205000
2024-06-03,0.238000
2025-10-01,0.260000
2011-09-01,0.267000
2018-09-04,0.200000
2011-06-01,0.276000
2021-05-03,0.143000
2024-12-02,0.241000
2013-03-01,0.195000
2020-08-03,0.172000
2008-03-03,0.258000
2022-12-01,0.161000
2012-06-01,0.236000
2014-03-03,0.188000
2022-02-01,0.139000
2023-02-01,0.175000
2013-02-01,0.213000
2021-02-01,0.154000
2022-07-01,0.142000
2024-12-24,0.253000
2011-10-03,0.249000
2013-04-01,0.550000
2011-05-02,0.271000
2017-08-01,0.184000
2026-02-02,0.274000
2009-03-02,0.266000
2017-12-01,0.180000
2024-04-01,0.234000
2025-06-02,0.266000
2011-11-01,0.258000
2019-05-01,0.197000
2020-05-01,0.178000
2023-05-01,0.183000
2008-08-01,0.304000
2011-03-01,0.252000
2023-09-01,0.207000
2025-12-18,0.277000
2020-12-23,0.805000
2021-06-01,0.148000
2025-03-03,0.233000
2011-07-01,0.260000
2014-05-01,0.194000
2017-10-02,0.181000
2019-04-01,0.205000
2016-08-01,0.185000
2020-12-01,0.154000
2013-09-03,0.214000
2018-08-01,0.203000
2019-12-02,0.191000
2020-07-01,0.172000
2025-02-03,0.253000
2014-08-01,0.200000
2014-12-01,0.192000
2015-10-01,0.183000
2020-10-01,0.158000
2007-10-01,0.298000
2008-12-01,0.296000
2025-04-01,0.261000
2019-03-01,0.189000
2021-09-01,0.143000
2021-08-02,0.145000
2012-09-04,0.231000
2014-07-01,0.198000
2016-03-01,0.176000
2016-12-22,0.002000
2015-11-02,0.180000
2025-11-03,0.269000
2011-02-01,0.279000
2015-09-01,0.184000
2016-05-02,0.177000
2025-08-01,0.265000
2023-06-01,0.193000
2007-12-24,0.295000
2013-05-01,0.204000
2016-04-01,0.185000
2021-12-23,1.110000
2009-09-01,0.286000
2017-09-01,0.186000
2025-12-01,0.264000
2019-10-01,0.194000
2022-06-01,0.144000
2026-06-01,0.282000
2008-09-02,0.305000
2011-04-01,0.283000
2016-07-01,0.177000
2018-03-01,0.171000
2009-05-01,0.286000
2020-03-02,0.181000
2026-04-01,0.281000
2008-12-24,0.296000
2017-06-01,0.184000
2023-07-03,0.192000
2025-05-01,0.253000
2008-07-01,0.299000
2015-12-23,0.446000
2021-07-01,0.141000
2008-04-01,0.306000
2014-02-03,0.241000
2015-03-02,0.175000
2019-02-01,0.218000
2012-10-01,0.220000
2013-12-24,0.804000
2019-09-03,0.202000
2023-03-01,0.163000
2023-10-02,0.206000
2024-03-01,0.211000
2008-10-01,0.283000
2009-02-02,0.298000
2015-12-01,0.181000
2017-03-01,0.166000
2010-11-01,0.276000
2021-04-01,0.461000
2026-05-01,0.274000
2021-10-01,0.138000
2024-02-01,0.226000
2010-04-01,0.283000
2010-05-03,0.283000
2019-12-23,0.197000
2022-03-01,0.126000
2016-11-01,0.179000
2024-09-03,0.243000
2018-10-01,0.195000
2023-04-03,0.188000
2024-10-01,0.236000
2009-07-01,0.291000
2015-08-03,0.190000
2017-07-03,0.178000
2018-02-01,0.187000
2011-12-01,0.250000
2011-12-23,1.281000
2022-11-01,0.161000
2007-09-04,0.300000
2010-06-01,0.275000
2010-12-01,0.271000
2013-08-01,0.223000
2010-10-01,0.270000
2014-12-23,0.653000
2021-03-01,0.138000
2021-11-01,0.141000
2009-11-02,0.296000
2011-03-23,0.295000
2023-12-22,0.225000
2010-03-01,0.264000
2012-12-03,0.214000
2016-06-01,0.181000
2019-06-03,0.205000
2020-09-01,0.168000
2024-07-01,0.234000
2025-07-01,0.258000
2007-11-01,0.295000
2010-12-27,0.706000
2013-12-02,0.207000
2018-11-01,0.201000
2020-02-03,0.207000
2020-04-01,0.204000
2023-11-01,0.216000
2017-12-26,0.268000
2018-12-24,0.201000
2007-07-02,0.219000
2009-12-01,0.281000
2015-05-01,0.186000
2017-05-01,0.178000
2014-06-02,0.204000
2009-08-03,0.291000
2011-08-01,0.276000
2012-03-01,0.232000
2013-11-01,0.212000
2017-11-01,0.186000
2018-12-03,0.197000
2021-12-01,0.138000
2024-08-01,0.242000
2007-05-01,0.210000
2008-11-03,0.309000
2018-04-02,0.195000
2022-12-23,0.172000
2014-10-01,0.188000
2018-05-01,0.189000
2022-05-02,0.138000
2016-10-03,0.174000
2019-11-01,0.198000
2022-04-01,0.166000
2023-08-01,0.203000
2008-02-01,0.294000
2010-02-01,0.292000
2010-09-01,0.278000
2015-04-01,0.215000
2017-04-03,0.185000
2019-08-01,0.204000
2025-09-02,0.266000
2009-04-01,0.303000
2009-10-01,0.284000
2010-08-02,0.277000
2020-11-02,0.163000
2012-12-24,1.621000
2014-04-01,0.244000
2019-07-01,0.198000
2022-09-01,0.148000
2009-12-28,0.298000
2010-07-01,0.271000
2018-06-01,0.197000
2026-07-01,0.275000
2022-10-03,0.148000
2014-09-02,0.199000
2015-02-02,0.192000
2020-06-01,0.182000
2022-08-01,0.148000
2008-05-01,0.277000
2008-06-02,0.307000
2012-04-02,0.509000
2013-06-03,0.210000
2017-02-01,0.178000
2023-12-01,0.213000
2014-11-03,0.197000
2015-07-01,0.185000
2018-07-02,0.201000
2012-08-01,0.232000
2016-09-01,0.181000
2016-12-01,0.176000