f/overrides/event-backup/banx-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
2022-09-21,0.390000
2014-03-13,0.500000
2014-09-10,0.500000
2025-03-20,0.550000
2019-06-19,0.380000
2021-09-20,0.380000
2024-03-20,0.450000
2022-12-28,0.490000
2023-12-28,0.550000
2025-06-23,0.450000
2026-03-23,0.150000
2017-03-20,0.370000
2018-12-21,0.520000
2020-12-18,0.430000
2026-02-03,0.150000
2026-04-23,0.150000
2019-09-20,0.380000
2019-12-20,0.380000
2017-09-20,0.380000
2022-03-18,0.390000
2023-06-20,0.390000
2024-12-26,0.650000
2025-12-26,0.450000
2014-12-10,0.500000
2016-03-17,0.350000
2015-06-17,0.330000
2021-06-18,0.380000
2026-06-23,0.150000
2026-08-24,0.150000
2020-03-17,0.380000
2021-03-17,0.380000
2016-09-23,0.370000
2023-10-19,0.420000
2013-12-19,0.280000
2015-03-18,0.500000
2015-12-18,0.350000
2020-09-24,0.380000
2022-06-21,0.390000
2026-01-21,0.150000
2017-12-21,0.380000
2018-03-19,0.380000
2023-03-23,0.390000
2025-09-22,0.450000
2025-12-03,0.400000
2016-12-20,0.370000
2017-06-16,0.370000
2026-07-24,0.150000
2021-12-28,0.480000
2024-09-26,0.450000
2026-01-22,0.100000
2026-05-22,0.150000
2015-09-17,0.330000
2018-09-21,0.380000
2018-06-20,0.380000
2020-06-18,0.380000
2023-09-21,0.450000
2014-06-11,0.500000
2016-06-16,0.370000
2019-03-18,0.380000
2024-06-24,0.450000