f/overrides/event-backup/erlvx-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
2018-08-09,0.159000
2020-06-09,0.074000
2022-12-09,0.804000
2023-09-11,0.076000
2026-06-09,0.086000
2017-03-09,0.075000
2017-12-14,0.988000
2019-03-11,0.073000
2020-03-10,0.075000
2022-06-09,0.074000
2024-12-10,0.893000
2014-09-09,0.098000
2014-12-16,7.266000
2015-05-21,0.253000
2015-06-09,0.075000
2020-08-18,0.149000
2021-03-09,0.077000
2021-06-09,0.079000
2016-03-09,0.073000
2016-12-15,0.076000
2025-03-11,0.083000
2025-06-10,0.095000
2015-03-10,0.093000
2015-09-09,0.076000
2017-09-11,0.076000
2018-06-11,0.077000
2018-09-11,0.077000
2015-12-17,1.404000
2018-12-07,1.482000
2019-06-11,0.076000
2019-09-10,0.076000
2020-12-10,0.094000
2016-06-09,0.075000
2016-09-09,0.075000
2018-03-09,0.076000
2021-09-09,0.079000
2024-03-11,0.068000
2025-12-09,1.472000
2026-03-10,0.073000
2017-06-09,0.076000
2019-12-17,0.251000
2020-09-09,0.075000
2021-12-09,1.615000
2022-03-09,0.078000
2022-09-09,0.078000
2023-03-09,0.078000
2023-06-09,0.078000
2023-12-11,0.536000
2024-06-11,0.107000
2024-09-10,0.081000
2025-09-09,0.068000