f/overrides/event-backup/birkx-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
2019-07-18,0.166000
2020-07-16,0.077000
2020-12-07,0.569000
2021-07-15,0.914000
2016-12-06,0.246000
2017-07-20,0.374000
2017-12-11,0.328000
2019-04-30,0.002000
2022-07-14,0.069000
2022-12-07,0.137000
2026-07-22,1.317000
2023-12-08,0.129000
2024-07-18,2.470000
2016-07-21,0.068000
2018-07-19,0.559000
2018-12-06,0.443000
2019-03-29,0.002000
2024-12-10,1.196000
2025-07-17,0.729000
2025-12-09,0.821000
2019-02-28,0.002000
2019-12-05,0.265000
2021-12-07,0.349000
2023-07-20,0.085000