f/overrides/event-backup/grid-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
2017-06-22,0.393000
2018-06-21,0.308000
2018-12-18,0.008000
2010-06-22,0.108000
2014-12-23,0.031000
2015-12-23,0.078000
2016-09-21,0.104000
2020-09-24,0.199000
2023-09-22,0.159000
2024-06-27,0.638000
2011-06-21,0.172000
2014-06-24,0.298000
2014-09-23,0.065000
2020-12-24,0.146000
2021-06-24,0.339000
2021-12-23,0.038000
2025-12-12,0.338000
2011-12-21,0.082000
2016-12-21,0.118000
2020-03-26,0.062000
2022-03-25,0.129000
2025-03-27,0.139000
2019-09-25,0.244000
2012-06-21,0.119000
2017-09-21,0.065000
2019-03-21,0.106000
2015-03-25,0.019000
2015-06-24,0.241000
2025-06-26,0.835000
2018-09-14,0.121000
2024-09-26,0.251000
2016-06-22,0.213000
2023-03-24,0.080000
2022-12-23,0.273000
2024-12-13,0.273000
2014-03-25,0.126000
2021-03-25,0.050000
2022-09-23,0.271000
2018-03-22,0.063000
2024-03-21,0.102000
2025-09-25,0.236000
2012-12-21,0.017000
2015-09-23,0.072000
2019-12-13,0.080000
2021-09-23,0.224000
2023-06-27,0.698000
2026-06-25,0.756000
2009-12-22,0.012000
2013-06-11,0.390000
2019-06-14,0.262000
2026-03-26,0.100000
2012-03-21,0.035000
2012-09-21,0.089000
2013-12-18,0.080000
2022-06-24,0.429000
2023-12-22,0.355000
2013-03-21,0.016000
2017-12-21,0.088000
2020-06-25,0.146000