f/overrides/event-backup/iedzx-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
2016-12-30,0.062000
2019-04-01,0.062000
2019-07-01,0.073000
2019-12-16,0.924000
2013-10-01,0.041000
2022-10-03,0.058000
2025-12-12,0.835000
2016-10-03,0.072000
2017-07-03,0.051000
2017-12-29,0.054000
2020-12-31,0.043000
2021-12-16,1.827000
2025-07-01,0.041000
2026-04-01,0.033000
2015-07-01,0.050000
2016-04-01,0.071000
2020-10-01,0.049000
2020-12-16,0.845000
2021-07-01,0.024000
2023-04-03,0.051000
2024-04-01,0.047000
2018-04-02,0.062000
2018-12-14,1.008000
2021-04-01,0.046000
2021-12-31,0.035000
2013-12-17,0.292000
2021-10-01,0.042000
2013-12-31,0.060000
2017-04-03,0.075000
2025-12-26,0.032000
2013-07-10,0.768000
2015-10-01,0.063000
2017-10-02,0.071000
2022-07-01,0.034000
2024-07-01,0.050000
2022-12-15,0.721000
2023-10-02,0.056000
2024-10-01,0.047000
2014-04-01,0.037000
2014-07-01,0.081000
2016-07-01,0.064000
2026-07-01,0.034000
2015-04-01,0.033000
2018-10-01,0.069000
2023-12-12,1.035000
2014-12-31,0.065000
2015-12-17,0.280000
2020-04-01,0.060000
2015-12-31,0.052000
2018-07-02,0.054000
2018-12-31,0.047000
2022-04-01,0.042000
2020-07-01,0.055000
2022-12-30,0.049000
2023-07-03,0.044000
2023-12-26,0.045000
2025-10-01,0.034000
2013-07-01,0.064000
2014-12-17,0.957000
2015-03-05,0.510000
2017-12-15,1.156000
2024-12-12,1.558000
2024-12-26,0.052000
2025-04-01,0.041000
2014-10-01,0.068000
2019-10-01,0.063000
2019-12-31,0.051000