f/overrides/event-backup/hdef-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
2017-03-22,0.165000
2022-03-18,0.231000
2019-03-15,0.206000
2020-12-18,0.295000
2024-09-20,0.208000
2026-03-20,0.146000
2018-09-26,0.206000
2018-12-19,0.304000
2018-03-21,0.137000
2022-06-24,0.605000
2023-03-17,0.069000
2024-03-15,0.198000
2025-06-20,0.631000
2015-12-16,0.382000
2016-09-21,0.034000
2020-09-18,0.230000
2021-03-19,0.260000
2021-12-17,0.144000
2022-09-16,0.249000
2023-06-23,0.669000
2023-09-15,0.232000
2016-12-09,1.311000
2019-12-20,0.145000
2026-06-18,0.714000
2024-12-20,0.139000
2025-03-21,0.179000
2023-12-15,0.110000
2016-12-21,0.135000
2017-09-21,0.216000
2025-09-19,0.212000
2025-12-19,0.181000
2019-09-20,0.179000
2021-06-25,0.414000
2022-12-16,0.094000
2017-12-19,0.108000
2018-06-27,0.085000
2019-06-28,0.507000
2020-03-20,0.130000
2020-06-26,0.256000
2021-09-17,0.308000
2024-06-21,0.556000
2016-06-21,0.617000
2017-06-21,0.347000