f/overrides/event-backup/imcg-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
2025-09-16,0.161000
2010-09-24,0.010167
2013-06-26,0.014500
2022-09-26,0.135000
2016-06-21,0.024833
2020-12-14,0.006667
2021-03-25,0.008333
2021-06-10,0.083000
2024-06-11,0.109000
2009-12-24,0.014500
2010-06-23,0.005833
2014-12-24,0.052000
2024-09-25,0.180000
2005-09-26,0.003000
2018-03-22,0.026500
2022-12-13,0.176000
2017-03-24,0.029667
2020-03-25,0.018167
2005-12-23,0.006500
2009-06-23,0.013833
2009-09-23,0.005833
2013-09-24,0.035500
2019-03-20,0.018667
2024-03-21,0.132000
2006-03-27,0.009500
2008-09-25,0.004500
2011-12-22,0.007333
2023-06-07,0.094000
2025-12-16,0.209000
2015-12-24,0.050333
2017-12-19,0.041833
2022-03-24,0.096000
2012-03-26,0.007167
2018-09-26,0.023500
2025-03-18,0.121000
2007-12-27,0.015167
2009-03-25,0.000500
2010-03-25,0.003000
2014-03-25,0.025333
2015-06-24,0.018167
2016-09-26,0.023833
2016-12-21,0.069500
2017-09-26,0.050000
2005-03-28,0.003167
2005-06-21,0.002500
2007-09-26,0.017667
2022-06-09,0.082000
2018-06-26,0.031000
2020-06-15,0.020667
2021-12-13,0.111000
2019-09-24,0.022500
2006-12-21,0.044833
2012-06-19,0.011167
2015-03-25,0.012667
2024-12-17,0.168000
2025-06-16,0.135000
2008-12-24,0.020333
2012-12-19,0.090500
2016-03-23,0.022667
2008-06-24,0.015000
2019-12-16,0.066167
2014-06-24,0.052833
2015-09-25,0.017000
2020-09-23,0.013167
2004-12-27,0.001167
2006-06-23,0.005000
2012-09-25,0.033167
2011-09-26,0.002333
2013-12-23,0.030000
2006-09-27,0.004833
2010-12-23,0.033500
2011-06-23,0.014833
2023-12-20,0.183000
2026-03-17,0.121000
2007-06-29,0.007000
2011-03-25,0.015167
2017-06-27,0.030167
2023-03-23,0.124000
2023-09-26,0.145000
2013-03-25,0.006833
2014-09-24,0.025500
2019-06-17,0.022000
2018-12-17,0.033500
2021-09-24,0.101000
2026-06-15,0.104000