f/overrides/event-backup/acmvx-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
2004-06-15,0.021000
2006-12-12,0.657000
2019-12-20,0.076000
2016-09-20,0.042000
2016-12-27,0.100000
2020-12-22,0.145000
2009-03-17,0.035000
2011-09-20,0.052000
2014-06-10,0.070000
2011-06-14,0.050000
2012-12-07,0.322000
2014-09-09,0.051000
2014-12-23,0.061000
2022-06-21,0.090000
2005-12-28,0.042000
2007-03-13,0.018000
2007-09-11,0.046000
2011-03-22,0.021000
2013-09-10,0.038000
2014-12-09,1.646000
2004-12-28,0.007000
2005-12-06,0.918000
2008-03-18,0.027000
2017-12-26,0.075000
2018-09-18,0.047000
2007-12-11,1.161000
2013-03-12,0.010000
2013-12-23,0.082000
2023-12-19,0.639000
2026-03-10,0.014000
2026-06-09,0.109000
2008-06-17,0.049000
2012-03-13,0.001000
2022-12-21,1.040000
2009-09-15,0.037000
2010-03-23,0.020000
2015-09-08,0.044000
2016-03-15,0.017000
2017-03-21,0.028000
2005-06-14,0.115000
2006-03-14,0.032000
2007-12-28,0.058000
2023-03-21,0.030000
2023-09-19,0.061000
2017-12-12,1.387000
2018-12-31,0.061000
2020-03-10,0.028000
2024-09-17,0.063000
2025-06-24,0.083000
2006-12-27,0.061000
2012-09-18,0.058000
2016-06-21,0.063000
2015-12-08,1.441000
2015-12-28,0.075000
2019-06-18,0.069000
2024-03-19,0.041000
2010-06-15,0.038000
2011-12-27,0.061000
2014-03-11,0.001000
2021-03-23,0.036000
2021-06-22,0.069000
2021-12-21,2.690000
2024-06-18,0.068000
2008-09-16,0.047000
2012-06-12,0.102000
2020-09-22,0.071000
2010-12-28,0.045000
2013-12-06,0.961000
2017-09-19,0.126000
2019-03-19,0.048000
2004-09-14,0.019000
2008-12-29,0.061000
2010-09-21,0.124000
2022-03-22,1.105000
2025-03-25,0.027000
2025-09-23,0.061000
2025-12-16,1.967000
2005-03-15,0.010000
2006-09-12,0.034000
2009-06-16,0.031000
2016-12-13,0.475000
2017-06-20,0.047000
2020-06-16,0.068000
2021-09-21,0.073000
2024-12-17,1.189000
2005-09-13,0.023000
2006-06-13,0.030000
2009-12-29,0.057000
2018-12-11,1.710000
2018-12-20,0.061000
2019-09-17,0.057000
2004-12-07,0.267000
2007-06-12,0.028000
2018-03-20,0.025000
2018-06-19,0.049000
2022-09-20,0.080000
2023-06-20,0.086000
2012-12-26,0.081000
2013-06-11,0.075000
2015-06-09,0.053000