f/overrides/event-backup/cevyx-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
2013-03-22,0.048000
2023-03-16,0.053000
2018-09-19,0.081000
2019-06-13,0.576000
2020-06-15,0.513000
2021-09-17,0.100000
2014-06-20,1.056000
2020-12-17,0.508000
2025-03-18,0.037000
2016-09-19,0.056000
2021-03-16,0.060000
2014-09-19,0.051000
2022-03-16,0.052000
2026-03-17,0.115000
2015-03-18,0.047000
2024-12-18,0.542000
2015-09-17,0.070000
2017-03-17,0.060000
2019-12-13,0.531000
2022-09-19,0.065000
2025-06-17,0.230000
2016-06-17,0.106000
2017-12-15,0.100000
2018-06-15,0.489000
2024-03-18,0.078000
2024-06-18,0.595000
2013-12-17,0.545000
2016-03-17,0.042000
2021-12-20,0.600000
2024-09-18,0.090000
2022-12-19,0.111000
2023-09-19,0.072000
2026-06-16,0.518000
2015-06-18,0.281000
2017-06-16,0.036000
2019-09-18,0.099000
2013-09-24,0.043000
2014-03-19,0.055000
2018-03-16,0.047000
2018-12-17,0.622000
2020-03-17,0.076000
2020-09-18,0.049000
2023-12-19,0.332000
2025-12-17,1.040000
2014-12-10,0.869000
2017-09-19,0.090000
2019-03-18,0.063000
2021-06-16,0.817000
2025-09-17,0.089000
2022-06-16,0.689000
2016-12-16,0.116000
2013-06-24,0.050000
2015-12-16,0.193000
2023-06-16,0.341000