f/overrides/event-backup/cmvyx-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
2018-09-19,0.035000
2025-03-18,0.041000
2013-12-09,1.939000
2014-03-21,0.027000
2021-09-17,0.026000
2023-06-16,0.098000
2024-12-09,0.707000
2015-03-20,0.028000
2017-06-16,0.536000
2022-12-08,0.229000
2025-06-17,0.301000
2009-12-10,0.037000
2014-06-20,1.526000
2013-03-22,0.036000
2016-12-09,0.812000
2018-03-16,0.031000
2018-06-15,0.795000
2010-03-24,0.014000
2012-03-23,0.022000
2024-03-18,0.042000
2013-09-24,0.028000
2015-09-22,0.032000
2016-03-17,0.027000
2020-09-18,0.023000
2021-06-16,0.203000
2023-09-19,0.033000
2010-06-22,0.017000
2010-12-10,0.048000
2024-06-18,0.200000
2016-06-17,0.343000
2025-12-08,0.622000
2026-03-17,0.036000
2014-12-10,1.470000
2021-03-16,0.020000
2017-12-08,2.312000
2020-06-15,0.306000
2021-12-08,1.033000
2023-12-08,0.042000
2011-12-12,0.049000
2017-03-17,0.033000
2019-06-13,0.060000
2020-12-08,0.022000
2014-09-24,0.030000
2019-12-06,0.274000
2026-06-16,0.391000
2011-03-24,0.013000
2012-06-22,0.039000
2013-06-21,0.097000
2022-03-16,0.027000
2022-09-19,0.030000
2023-03-16,0.034000
2010-09-24,0.098000
2011-09-26,0.030000
2015-12-10,1.611000
2020-03-17,0.040000
2025-09-17,0.035000
2011-06-22,0.028000
2018-12-07,2.368000
2015-06-18,0.728000
2016-09-19,0.027000
2017-09-19,0.034000
2019-09-18,0.035000
2012-09-25,0.049000
2012-12-13,0.042000
2024-09-18,0.044000
2019-03-18,0.031000
2022-06-16,0.496000