f/overrides/event-backup/jsml-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
2019-03-29,0.022000
2019-09-30,0.024000
2021-12-20,0.089000
2023-06-30,0.063000
2023-09-29,0.057000
2024-09-30,0.055000
2025-09-30,0.090000
2017-12-22,0.073000
2026-06-30,0.046000
2022-09-30,0.040000
2023-12-20,0.132000
2022-06-30,0.059000
2020-03-31,0.033000
2022-03-31,0.013000
2024-03-28,0.053000
2024-06-28,0.051000
2025-03-31,0.268000
2025-06-30,0.207000
2017-06-30,0.007000
2020-06-30,0.016000
2020-09-30,0.017000
2019-06-28,0.041000
2017-09-29,0.046000
2018-09-28,0.020000
2020-12-21,0.126000
2021-03-31,0.064000
2017-03-31,0.027000
2018-03-29,0.071000
2021-09-30,0.125000
2016-12-23,0.139000
2019-12-19,0.039000
2023-03-31,0.038000
2024-12-20,0.623000
2025-12-19,0.124000
2018-12-20,0.110000
2018-06-29,0.069000
2021-06-30,0.019000
2022-12-20,0.195000
2026-03-31,0.042000
2016-06-30,0.015000