f/overrides/event-backup/fems-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
2020-06-25,0.338000
2023-06-27,0.665000
2013-09-20,0.239000
2015-06-24,0.293000
2021-09-23,0.729000
2013-12-18,0.148000
2017-09-21,0.741000
2025-03-27,0.094000
2025-09-25,0.532000
2023-03-24,0.100000
2023-12-22,0.370000
2019-12-13,0.645000
2024-06-27,0.542000
2014-12-23,0.439000
2015-09-23,0.332000
2016-06-22,0.285000
2017-12-21,0.436000
2025-06-26,0.522000
2025-12-12,0.649000
2013-03-21,0.089000
2014-06-24,0.220000
2018-03-22,0.183000
2021-03-25,0.514000
2012-06-21,0.315000
2018-09-14,0.422000
2016-03-23,0.017000
2016-12-21,0.110000
2016-09-21,0.317000
2021-12-23,0.836000
2023-09-22,0.652000
2014-03-25,0.048000
2014-09-23,0.424000
2020-03-26,0.185000
2026-06-25,0.445000
2012-09-21,0.227000
2018-12-18,0.415000
2026-03-26,0.303000
2012-12-21,0.136000
2022-12-23,0.092000
2015-12-23,0.262000
2019-06-14,0.379000
2022-09-23,0.751000
2013-06-21,0.167000
2020-09-24,0.419000
2020-12-24,0.251000
2021-06-24,0.431000
2022-03-25,0.119000
2024-09-26,0.341000
2024-12-13,0.445000
2018-06-21,0.488000
2019-09-25,0.705000
2022-06-24,0.809000
2024-03-21,0.168000
2017-06-22,0.292000