f/overrides/event-backup/fstlx-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
2020-03-24,0.115000
2025-09-16,0.098000
2016-12-19,0.135000
2019-09-24,0.117000
2019-12-18,0.127000
2022-12-16,0.160000
2017-09-25,0.122000
2018-03-26,0.113000
2018-09-24,0.092000
2020-09-24,0.108000
2021-12-17,0.119000
2023-06-16,0.103000
2024-06-17,0.089000
2025-12-16,0.075000
2017-03-24,0.107000
2018-06-25,0.106000
2020-06-24,0.093000
2022-03-24,0.094000
2023-12-12,0.176000
2024-03-18,0.088000
2025-03-17,0.104000
2018-12-06,2.001000
2019-03-25,0.097000
2019-12-05,0.364000
2021-03-24,0.096000
2021-09-24,0.114000
2021-12-06,5.450000
2022-09-26,0.082000
2024-12-12,4.343000
2017-12-05,2.477000
2019-06-24,0.105000
2025-12-11,1.919000
2024-09-16,0.087000
2024-12-16,0.137000
2016-12-05,0.999000
2022-06-24,0.095000
2021-06-24,0.107000
2022-12-06,3.480000
2023-03-16,0.092000
2023-12-18,0.140000
2025-06-16,0.077000
2026-03-16,0.095000
2017-06-26,0.112000
2018-12-18,0.166000
2026-06-16,0.063000
2020-12-18,0.137000
2023-09-18,0.105000
2016-09-26,0.103000
2017-12-18,0.083000