f/overrides/event-backup/bdcz-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
2021-04-12,0.379000
2016-04-08,0.453000
2016-07-12,0.453000
2017-10-12,0.455000
2018-10-11,0.417000
2019-01-11,0.454000
2018-04-12,0.421000
2019-10-10,0.414000
2020-10-09,0.377000
2025-04-11,0.581000
2025-07-14,0.444000
2016-01-11,0.457000
2017-01-11,0.445000
2017-07-12,0.483000
2021-10-12,0.381000
2024-10-11,0.450000
2026-01-13,0.320000
2026-04-13,0.453000
2026-07-14,0.532000
2018-07-13,0.426000
2019-04-11,0.417000
2023-01-12,0.427000
2023-04-12,0.432000
2025-10-10,0.446000
2020-04-09,0.447000
2020-07-13,0.366000
2022-10-12,0.405000
2022-07-13,0.411000
2023-07-13,0.429000
2024-01-12,0.440000
2024-04-11,0.460000
2025-01-13,0.323000
2024-07-15,0.446000
2016-10-11,0.435000
2017-04-10,0.442000
2019-07-12,0.429000
2022-01-11,0.378000
2023-10-12,0.444000
2018-01-12,0.447000
2020-01-10,0.434000
2021-01-12,0.371000
2021-07-13,0.371000
2022-04-11,0.377000