f/overrides/event-backup/mczzx-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
2021-12-15,0.436000
2024-12-31,0.036000
2025-01-31,0.035000
2016-12-19,0.361000
2025-04-30,0.036000
2025-10-31,0.035000
2026-05-29,0.033000
2017-12-18,0.332000
2020-12-11,0.687000
2022-12-13,0.353000
2024-08-30,0.035000
2025-06-30,0.037000
2025-07-31,0.036000
2013-12-18,0.376000
2025-09-30,0.039000
2026-02-27,0.033000
2026-03-31,0.037000
2012-12-19,0.533000
2024-07-31,0.038000
2025-03-31,0.036000
2025-05-30,0.034000
2025-11-28,0.032000
2026-04-30,0.035000
2026-07-31,0.036000
2019-12-13,0.380000
2024-09-30,0.037000
2024-10-31,0.035000
2024-11-29,0.034000
2025-12-31,0.037000
2026-06-30,0.037000
2015-12-17,0.494000
2023-12-12,0.425000
2025-02-28,0.035000
2025-08-29,0.034000
2011-12-19,0.524000
2014-12-17,0.350000
2018-12-14,0.358000
2026-01-30,0.034000