f/overrides/event-backup/esgs-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
2024-03-22,0.191430
2026-03-26,0.240300
2026-06-25,0.257400
2020-12-18,0.209960
2021-09-24,0.234080
2023-06-26,0.242720
2024-06-24,0.232400
2025-09-24,0.219880
2018-03-23,0.145120
2019-06-24,0.195750
2022-09-26,0.252170
2024-09-24,0.225070
2025-06-24,0.246580
2016-10-03,0.170870
2017-04-03,0.154830
2017-10-02,0.185680
2018-06-25,0.224330
2020-03-25,0.168980
2023-09-25,0.253420
2021-03-25,0.176370
2023-03-27,0.234730
2017-12-26,2.901240
2018-09-24,0.188660
2018-12-21,1.328140
2019-03-25,0.180990
2020-06-24,0.194680
2020-09-24,0.185760
2025-03-25,0.240250
2023-12-18,0.250550
2024-12-18,1.276090
2016-12-23,0.502550
2017-07-03,0.166820
2021-06-24,0.218980
2021-12-20,0.350780
2022-03-25,0.257940
2022-06-24,0.254010
2019-09-24,0.189240
2019-12-20,0.262670
2022-12-19,0.248680
2025-12-18,0.265300