f/overrides/event-backup/hncvx-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
2018-03-28,0.022000
2018-06-28,0.023000
2018-12-17,0.595000
2022-12-19,0.063000
2023-09-29,0.104000
2017-03-30,0.040000
2017-06-29,0.033000
2019-09-26,0.023000
2019-12-16,0.369000
2023-06-30,0.105000
2024-03-28,0.089000
2024-09-30,0.088000
2016-12-19,0.067000
2020-03-30,0.019000
2022-03-30,0.006000
2022-06-29,0.006000
2025-03-31,0.061000
2025-06-30,0.080000
2016-06-29,0.029000
2018-09-27,0.023000
2021-12-20,1.666000
2024-06-28,0.093000
2024-12-20,0.143000
2025-12-19,0.112000
2026-03-31,0.057000
2017-12-18,1.025000
2021-03-30,0.006000
2022-09-29,0.015000
2023-03-31,0.071000
2026-06-30,0.071000
2017-09-28,0.040000
2019-06-27,0.025000
2020-06-29,0.016000
2016-03-30,0.026000
2016-09-29,0.025000
2019-03-28,0.024000
2020-09-29,0.015000
2020-12-17,1.243000
2023-12-19,0.073000
2021-06-29,0.003000
2025-09-30,0.058000