f/overrides/event-backup/eusa-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
2012-09-24,0.158000
2020-09-23,0.262000
2024-03-21,0.306000
2025-12-16,0.559000
2012-03-23,0.130000
2020-12-14,0.223000
2022-06-09,0.265000
2024-09-25,0.413000
2011-06-23,0.064000
2015-12-24,0.262000
2023-09-26,0.329000
2014-06-25,0.308000
2019-03-20,0.192000
2022-03-24,0.303000
2026-06-15,0.306000
2013-06-27,0.176000
2011-09-26,0.069000
2012-12-19,0.208000
2013-09-24,0.169000
2017-06-27,0.209000
2017-09-26,0.218000
2020-03-25,0.322000
2020-06-15,0.239000
2012-06-22,0.141000
2015-06-24,0.203000
2016-12-22,0.244000
2018-09-26,0.286000
2019-12-16,0.319000
2010-12-23,0.204000
2018-12-28,0.042000
2022-12-13,0.283000
2010-06-23,0.066000
2017-03-24,0.159000
2017-12-21,0.247000
2010-09-24,0.129000
2015-09-25,0.206000
2015-12-29,0.056000
2016-03-23,0.152000
2016-09-26,0.172000
2021-03-25,0.220000
2023-06-07,0.277000
2025-06-16,0.357000
2013-03-25,0.155000
2018-06-26,0.232000
2018-12-17,0.247000
2021-06-10,0.229000
2021-09-24,0.331000
2022-09-26,0.410000
2023-03-23,0.305000
2025-09-16,0.442000
2026-03-17,0.354000
2014-09-24,0.207000
2015-03-25,0.207000
2016-06-21,0.186000
2018-03-22,0.193000
2023-12-20,0.383000
2019-06-17,0.244000
2013-12-23,0.280000
2014-03-25,0.146000
2019-09-24,0.201000
2011-12-22,0.052000
2014-12-24,0.186000
2021-12-13,0.319000
2024-06-11,0.293000
2025-03-18,0.324000
2011-03-24,0.114000
2024-12-17,0.394000