f/overrides/event-backup/imcb-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
2010-03-25,0.055000
2012-12-19,0.108750
2018-03-22,0.129750
2021-12-13,0.241000
2023-06-07,0.186000
2006-12-21,0.107250
2007-03-26,0.090000
2008-12-24,0.085000
2023-09-26,0.299000
2011-12-22,0.086750
2016-09-26,0.138000
2025-06-16,0.257000
2018-06-26,0.164750
2020-12-14,0.181750
2021-09-24,0.237000
2006-03-27,0.077000
2006-09-27,0.040250
2009-09-23,0.055750
2026-06-15,0.283000
2005-09-26,0.044500
2013-12-23,0.112000
2015-03-25,0.098000
2020-09-23,0.170500
2024-03-21,0.238000
2012-09-25,0.072500
2014-12-24,0.200000
2015-06-24,0.112500
2022-03-24,0.216000
2022-06-09,0.187000
2022-12-13,0.298000
2004-12-27,0.031500
2009-03-25,0.042750
2017-12-19,0.182000
2019-03-20,0.166000
2019-06-17,0.169250
2008-12-29,0.009500
2013-06-26,0.110750
2014-06-24,0.121000
2017-06-27,0.142500
2021-03-25,0.126750
2022-09-26,0.294000
2009-06-23,0.044250
2010-12-23,0.110250
2016-12-21,0.256500
2020-06-15,0.131250
2023-03-23,0.239000
2023-12-20,0.319000
2006-06-23,0.037500
2016-03-23,0.174000
2019-12-16,0.181750
2025-12-16,0.349000
2009-12-24,0.081750
2010-06-23,0.045000
2012-03-26,0.068750
2016-06-21,0.135000
2017-09-26,0.146500
2007-09-26,0.028750
2008-03-25,0.023250
2008-06-24,0.049750
2011-06-23,0.068500
2015-09-25,0.127250
2024-06-11,0.221000
2025-09-16,0.302000
2005-12-23,0.068250
2007-12-27,0.063000
2008-09-25,0.058000
2015-12-24,0.189250
2017-03-24,0.134250
2018-09-26,0.256750
2021-06-10,0.164000
2007-06-29,0.042250
2013-09-24,0.083500
2014-09-24,0.102000
2014-03-25,0.093250
2018-12-17,0.177500
2020-03-25,0.170250
2024-09-25,0.316000
2004-09-27,0.029500
2005-06-21,0.037500
2010-09-24,0.079250
2019-09-24,0.176500
2024-12-17,0.313000
2025-03-18,0.263000
2011-03-25,0.053250
2011-09-26,0.075750
2012-06-19,0.080750
2005-03-28,0.041500
2013-03-25,0.079000
2026-03-17,0.241000