f/overrides/event-backup/dsfrx-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
2021-09-15,0.008000
2022-03-16,0.027000
2024-09-18,0.013000
2006-06-15,0.245015
2007-12-12,8.043973
2012-06-20,0.402822
2012-09-19,0.199334
2018-06-20,0.099000
2012-03-21,0.718434
2014-03-19,0.328071
2022-09-14,0.012000
2011-12-21,0.340530
2013-03-20,0.847171
2013-06-19,0.290696
2016-09-21,0.236710
2023-09-13,0.012000
2004-06-16,0.444350
2018-03-21,0.041000
2023-06-21,0.059000
2024-12-18,1.930000
2014-06-18,0.975908
2019-06-19,0.020000
2021-03-17,0.053000
2021-06-16,0.034000
2021-12-15,2.050000
2006-12-13,0.294849
2011-06-22,0.290696
2011-09-21,0.236710
2014-09-17,0.311460
2018-09-19,0.081000
2004-06-17,0.444350
2005-06-15,0.232557
2020-03-18,0.092000
2023-03-15,0.064000
2003-12-17,0.124584
2005-12-15,0.240862
2009-09-16,0.170265
2015-12-16,10.797280
2023-12-13,0.298000
2023-12-27,0.009000
2020-12-16,0.718000
2022-06-15,0.019000
2025-06-11,0.130000
2010-03-24,0.473419
2013-09-18,0.199334
2015-03-18,0.361294
2016-03-16,0.897005
2020-06-17,0.040000
2010-06-23,0.390363
2010-09-22,0.199334
2024-03-20,0.063000
2026-06-17,0.144000
2019-09-18,0.032000
2019-12-18,0.526000
2008-11-25,1.154478
2009-03-16,0.058140
2014-12-17,16.121168
2015-09-16,0.348835
2019-03-20,0.103000
2004-12-15,0.436044
2007-06-13,0.282390
2017-12-20,17.607872
2024-06-12,0.052000
2020-09-16,0.025000
2022-12-14,0.528000
2025-12-17,4.146000
2008-06-11,1.303979
2011-03-23,0.589698
2012-12-19,0.402822
2016-12-21,4.443496
2018-12-19,2.602000
2009-03-11,0.901158