f/overrides/event-backup/aes-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
2025-01-31,0.176000
2015-05-01,0.100000
2016-04-28,0.110000
2019-04-30,0.137000
2019-07-31,0.137000
2024-08-01,0.173000
2022-01-31,0.158000
1993-07-19,0.040453
2013-01-30,0.040000
2018-10-31,0.130000
2024-01-31,0.173000
2025-08-01,0.176000
2026-01-30,0.176000
2020-01-30,0.143000
2021-01-28,0.151000
2021-11-01,0.151000
2020-10-29,0.143000
1994-11-04,0.042000
2013-04-29,0.040000
2018-04-30,0.130000
2021-07-30,0.151000
2022-10-31,0.158000
2023-07-31,0.166000
2015-10-29,0.100000
2016-10-28,0.110000
2019-10-31,0.137000
2026-07-31,0.176000
1993-11-04,0.040453
2014-01-30,0.050000
2017-10-31,0.120000
2022-04-28,0.158000
2015-07-30,0.100000
2017-04-27,0.120000
2020-04-30,0.143000
2026-05-01,0.176000
2013-10-30,0.040000
2017-01-30,0.120000
2023-01-31,0.166000
2020-07-31,0.143000
1993-02-23,0.024272
2016-01-29,0.110000
2018-08-02,0.130000
2013-07-30,0.040000
2014-10-30,0.050000
2016-07-28,0.110000
2024-04-30,0.173000
2015-01-30,0.100000
2022-07-29,0.158000
2023-04-28,0.166000
2021-04-29,0.151000
2023-10-31,0.166000
2017-08-01,0.120000
2018-01-31,0.130000
2019-01-31,0.137000
1992-09-02,0.016181
2024-11-01,0.173000
2014-04-29,0.050000
2025-05-01,0.176000
2025-10-31,0.176000
2012-10-26,0.040000
2014-07-30,0.050000