f/overrides/event-backup/mstzx-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
2014-12-17,0.245000
2024-07-31,0.033000
2025-12-12,0.020000
2012-12-19,0.361000
2013-12-18,0.232000
2017-12-18,0.268000
2023-02-28,0.029000
2025-04-30,0.033000
2024-11-29,0.030000
2024-05-31,0.032000
2025-01-31,0.032000
2025-10-31,0.034000
2022-11-30,0.028000
2023-01-31,0.028000
2023-10-31,0.028000
2023-12-29,0.026000
2024-01-31,0.029000
2024-12-31,0.033000
2016-12-19,0.250000
2023-07-31,0.028000
2023-09-29,0.027000
2024-04-30,0.034000
2019-12-13,0.347000
2023-03-31,0.028000
2025-12-31,0.036000
2026-02-27,0.031000
2026-03-31,0.033000
2026-05-29,0.031000
2026-06-30,0.035000
2024-09-30,0.033000
2011-12-19,0.435000
2025-03-31,0.032000
2021-12-08,0.199000
2022-12-30,0.023000
2024-03-28,0.025000
2024-06-28,0.029000
2023-08-31,0.028000
2025-05-30,0.031000
2025-11-28,0.030000
2020-12-11,0.450000
2023-05-31,0.029000
2026-01-30,0.033000
2026-04-30,0.033000
2015-12-17,0.270000
2018-12-14,0.392000
2022-04-29,0.023000
2022-10-31,0.030000
2025-02-28,0.029000
2024-02-29,0.027000
2024-10-31,0.035000
2025-06-30,0.035000
2025-09-30,0.036000
2026-07-31,0.032000
2023-04-28,0.024000
2023-06-30,0.027000
2023-11-30,0.027000
2024-08-30,0.029000
2025-07-31,0.034000
2025-08-29,0.032000