f/overrides/event-backup/mfem-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
2023-04-03,0.110000
2023-12-28,0.160000
2024-12-31,0.180000
2025-10-01,0.220000
2025-12-31,0.070000
2018-04-02,0.015000
2019-10-01,0.075000
2020-10-01,0.080000
2026-04-01,0.150000
2021-12-10,4.537000
2022-04-01,0.100000
2023-07-03,0.260000
2024-07-01,0.210000
2018-10-01,0.125000
2019-12-30,0.280000
2021-04-01,0.030000
2021-10-01,0.600000
2025-04-01,0.150000
2018-07-02,0.120000
2018-12-28,0.400000
2022-12-12,0.588000
2020-04-01,0.070000
2022-07-01,0.190000
2022-10-03,0.290000
2021-12-30,1.570000
2023-10-02,0.240000
2025-07-01,0.200000
2017-12-28,0.054000
2019-04-01,0.085000
2021-07-01,0.190000
2024-04-01,0.140000
2024-10-01,0.590000
2019-07-01,0.150000
2020-12-30,0.200000
2022-12-29,0.050000
2020-07-01,0.110000
2026-07-01,0.190000