f/overrides/event-backup/cihix-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
2009-06-29,0.119000
2009-12-30,0.062000
2014-03-28,0.220000
2015-03-30,0.049000
2019-09-27,0.151000
2020-03-30,0.058000
2021-06-29,0.094000
2022-09-29,0.070000
2010-12-30,0.058000
2011-03-30,0.017000
2011-12-29,0.046000
2012-09-27,0.041000
2017-06-29,0.118000
2023-06-29,0.136000
2024-12-19,0.159000
2025-09-29,0.206000
2025-12-18,0.099000
2024-06-27,0.155000
2010-09-29,0.080000
2012-03-29,0.045000
2014-06-27,0.151000
2017-03-30,0.046000
2018-06-28,0.062000
2007-12-27,0.041000
2008-09-29,0.095000
2010-04-30,0.026000
2018-12-20,0.036000
2019-03-28,0.049000
2014-09-29,0.071000
2015-06-29,0.161000
2017-09-28,0.146000
2007-09-27,0.105000
2009-03-30,0.043000
2011-06-29,0.130000
2012-12-28,0.027000
2013-12-30,0.043000
2019-12-20,0.039000
2023-09-28,0.230000
2025-06-27,0.123000
2010-06-29,0.077000
2011-09-29,0.081000
2015-12-30,0.020000
2018-03-28,0.035000
2024-03-27,0.074000
2009-09-29,0.070000
2016-03-30,0.060000
2022-06-29,0.092000
2026-06-29,0.176000
2015-09-29,0.049000
2020-09-29,0.102000
2025-03-28,0.058000
2008-12-24,0.044000
2012-06-28,0.129000
2014-12-30,0.024000
2020-12-22,0.005000
2021-09-29,0.136000
2006-03-31,0.047000
2006-09-28,0.079000
2007-03-29,0.059000
2010-03-30,0.026000
2013-06-27,0.119000
2016-12-29,0.043000
2008-06-27,0.173000
2023-03-30,0.073000
2026-03-30,0.118000
2006-12-28,0.037000
2007-06-28,0.166000
2016-09-29,0.067000
2024-09-27,0.173000
2013-09-27,0.054000
2017-12-28,0.046000
2022-03-30,0.091000
2022-12-22,0.021000
2006-06-29,0.089000
2008-03-28,0.065000
2011-07-28,0.013000
2013-03-27,0.059000
2016-06-29,0.120000
2007-11-29,0.707000
2018-09-27,0.141000
2019-06-27,0.122000
2020-06-29,0.062000
2021-03-30,0.102000