f/overrides/event-backup/canax-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
2025-06-13,0.085000
2019-03-22,0.016000
2018-06-22,0.039000
2021-06-18,0.050000
2022-09-16,0.055000
2023-06-16,0.060000
2017-12-15,0.151000
2016-09-16,0.019000
2018-12-24,0.237000
2021-12-20,0.058000
2022-12-19,0.314000
2024-03-15,0.070000
2024-12-18,0.070000
2016-06-17,0.013000
2019-12-23,0.248000
2020-09-18,0.040000
2017-06-16,0.018000
2020-03-20,0.031000
2020-06-19,0.050000
2022-06-17,0.065000
2024-09-20,0.065000
2026-06-17,0.095000
2016-12-16,0.110000
2021-09-17,0.055000
2023-03-17,0.060000
2023-09-15,0.076000
2018-09-21,0.049000
2019-06-21,0.043000
2019-09-20,0.010000
2022-03-18,0.066000
2023-12-18,0.075000
2024-06-14,0.070000
2025-09-19,0.090000
2025-12-17,0.089000
2017-09-15,0.018000
2026-03-19,0.095000
2018-03-23,0.018000
2020-12-21,0.333000
2021-03-19,0.035000
2025-03-14,0.080000
2017-03-17,0.019000