f/overrides/event-backup/imtm-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
2021-06-10,0.312000
2022-06-09,0.474000
2022-12-13,0.353000
2024-06-11,0.516000
2015-06-25,0.299000
2016-06-22,0.335000
2016-12-21,0.347000
2019-12-16,0.205000
2023-06-07,0.431000
2024-12-17,0.581000
2018-06-19,0.381000
2018-12-18,0.223000
2019-06-17,0.459000
2020-06-15,0.224000
2021-12-30,0.086000
2023-12-20,0.354000
2025-06-16,0.534000
2026-06-15,0.602000
2015-12-21,0.096000
2017-06-20,0.345000
2017-12-19,0.239000
2020-12-14,0.141000
2021-12-13,1.661000
2025-12-16,1.721000