f/overrides/event-backup/itb-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
2022-12-13,0.123000
2014-06-24,0.020000
2016-09-26,0.025000
2022-09-26,0.149000
2011-03-25,0.022000
2012-09-25,0.012000
2018-12-17,0.056000
2016-06-21,0.028000
2017-12-19,0.025000
2021-06-10,0.071000
2022-03-24,0.148000
2023-06-07,0.099000
2006-12-20,0.066000
2011-09-23,0.031000
2014-09-24,0.021000
2013-06-26,0.004000
2018-03-22,0.048000
2008-12-23,0.125000
2010-12-22,0.019000
2012-06-19,0.021000
2026-06-15,0.159000
2010-09-23,0.017000
2021-12-13,0.068000
2024-06-11,0.094000
2012-12-19,0.060000
2026-03-17,0.180000
2018-09-26,0.041000
2020-03-25,0.077000
2024-12-17,0.118000
2013-09-24,0.015000
2014-12-24,0.029000
2015-09-25,0.020000
2016-12-21,0.031000
2024-03-21,0.143000
2008-09-24,0.055000
2010-03-25,0.020000
2011-12-22,0.021000
2017-09-26,0.032000
2020-06-15,0.053000
2020-12-14,0.077000
2007-12-27,0.097000
2010-06-24,0.022000
2016-03-23,0.034000
2019-06-17,0.055000
2020-09-23,0.051000
2023-12-20,0.101000
2024-09-25,0.120000
2025-03-18,0.657000
2009-06-24,0.032000
2018-06-26,0.046000
2019-03-20,0.062000
2025-12-16,0.170000
2019-09-24,0.050000
2019-12-16,0.055000
2021-03-25,0.078000
2021-09-24,0.091000
2025-09-16,0.134000
2007-03-23,0.069000
2012-12-27,0.020000
2017-06-27,0.031000
2008-03-25,0.077000
2013-03-25,0.004000
2014-03-25,0.018000
2022-06-09,0.102000
2025-06-16,0.652000
2009-09-22,0.019000
2009-12-23,0.024000
2015-12-24,0.028000
2006-06-22,0.035000
2008-06-25,0.073000
2017-03-24,0.033000
2023-03-23,0.140000
2006-09-26,0.068000
2011-06-24,0.020000
2015-06-24,0.023000
2013-12-23,0.007000
2015-03-25,0.022000
2023-09-26,0.151000
2007-06-28,0.065000
2007-09-25,0.061000
2012-03-26,0.017000