f/overrides/event-backup/czmvx-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
2017-06-16,0.055000
2020-06-15,0.051000
2025-03-18,0.062000
2025-12-08,2.179000
2018-09-19,0.046000
2019-03-18,0.053000
2019-09-18,0.051000
2021-06-16,0.051000
2022-12-08,1.511000
2024-03-18,0.058000
2017-12-08,0.531000
2019-06-13,0.053000
2020-03-17,0.055000
2024-09-18,0.068000
2017-03-17,0.036000
2020-09-18,0.053000
2026-06-16,0.051000
2018-03-16,0.048000
2021-12-08,1.241000
2023-03-16,0.061000
2023-12-08,0.798000
2025-06-17,0.060000
2017-09-19,0.043000
2018-12-07,0.853000
2019-12-06,0.369000
2021-03-16,0.049000
2022-09-19,0.055000
2023-06-16,0.061000
2024-12-09,1.216000
2018-06-15,0.051000
2021-09-17,0.055000
2022-03-16,0.050000
2022-06-16,0.076000
2023-09-19,0.061000
2024-06-18,0.064000
2020-12-08,0.209000
2025-09-17,0.050000
2026-03-17,0.050000