f/overrides/event-backup/cphnx-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
2019-12-20,0.539000
2020-12-21,0.191000
2022-12-21,0.084000
2023-03-29,0.037000
2024-09-26,0.051000
2024-12-20,0.452000
2015-06-26,0.450000
2017-12-21,0.587000
2025-09-26,0.053000
2021-03-29,0.062000
2022-03-29,0.028000
2023-06-28,0.322000
2013-12-23,0.285000
2020-03-27,0.033000
2014-09-29,0.027000
2016-12-22,0.287000
2017-03-28,0.028000
2017-09-27,0.029000
2019-06-26,0.325000
2021-12-22,0.784000
2013-09-26,0.037000
2014-03-28,0.041000
2023-09-27,0.042000
2023-12-21,0.121000
2019-09-26,0.043000
2021-09-28,0.056000
2025-12-19,0.485000
2026-03-27,0.049000
2014-06-26,0.705000
2015-09-28,0.030000
2018-09-26,0.043000
2018-12-21,0.464000
2020-09-28,0.027000
2021-06-28,1.139000
2015-12-22,0.462000
2018-06-27,0.588000
2022-06-28,0.504000
2022-09-28,0.031000
2024-06-26,0.249000
2025-06-26,0.457000
2026-06-26,0.565000
2015-03-27,0.034000
2016-03-28,0.022000
2019-03-27,0.042000
2020-06-26,0.502000
2016-09-27,0.025000
2017-06-27,0.336000
2018-03-27,0.038000
2024-03-26,0.050000
2025-03-27,0.036000
2014-12-22,0.762000
2016-06-28,0.307000