f/overrides/event-backup/auizx-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
2021-06-08,0.185000
2021-12-07,4.731000
2022-09-06,0.128000
2023-12-05,0.465000
2024-03-05,0.149000
2025-09-09,0.160000
2017-12-14,1.323000
2020-12-10,0.413000
2016-12-15,0.284000
2017-06-06,0.205000
2017-09-06,0.187000
2023-09-05,0.117000
2014-09-09,0.135000
2016-06-07,0.154000
2018-09-05,0.175000
2019-03-05,0.119000
2020-06-02,0.177000
2025-03-11,0.179000
2015-12-17,0.866000
2018-03-06,0.142000
2015-03-10,0.192000
2024-06-11,0.143000
2013-12-20,2.480000
2014-03-11,0.168000
2019-09-04,0.149000
2019-12-12,1.133000
2022-06-07,0.148000
2022-12-06,1.703000
2025-06-10,0.132000
2015-09-09,0.148000
2016-09-07,0.191000
2017-03-07,0.150000
2020-09-08,0.105000
2022-03-08,0.072000
2023-06-06,0.148000
2024-09-10,0.139000
2026-03-10,0.140000
2014-06-10,0.543000
2016-03-08,0.212000
2026-06-09,0.127000
2025-12-12,2.552000
2019-06-04,0.259000
2023-03-07,0.164000
2018-06-05,0.249000
2018-12-13,2.759000
2020-03-03,0.147000
2021-03-02,0.090000
2021-09-07,0.110000
2024-12-13,3.129000
2014-12-18,2.062000
2015-06-09,0.211000