f/overrides/event-backup/bktsx-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
2018-07-19,0.051000
2018-12-14,0.119000
2021-10-07,0.064000
2017-04-12,0.048000
2020-04-08,0.070000
2022-10-13,0.071000
2024-04-10,0.068000
2024-07-18,0.076000
2025-10-09,0.091000
2025-12-16,0.096000
2019-07-18,0.065000
2019-04-10,0.060000
2022-07-14,0.071000
2022-12-13,0.090000
2024-12-12,0.112000
2026-04-15,0.084000
2026-07-22,0.096000
2018-04-11,0.053000
2016-10-13,0.043000
2016-12-15,0.069000
2017-12-15,0.114000
2020-12-10,0.090000
2021-07-15,0.052000
2025-07-17,0.089000
2015-10-15,0.026000
2018-10-11,0.072000
2019-10-10,0.071000
2019-12-12,0.130000
2020-07-16,0.051000
2021-12-09,0.187000
2022-04-13,0.058000
2023-10-12,0.075000
2017-07-20,0.050000
2025-04-09,0.076000
2020-10-08,0.061000
2021-04-07,0.047000
2016-07-21,0.018000
2017-10-12,0.065000
2023-04-12,0.070000
2023-07-20,0.070000
2023-12-14,0.106000
2024-10-10,0.085000
2016-04-13,0.037000