f/overrides/event-backup/gm-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
2014-09-08,0.300000
2017-03-08,0.380000
2017-06-07,0.380000
2017-09-07,0.380000
2023-03-02,0.090000
2025-03-07,0.120000
2015-06-08,0.360000
2015-09-10,0.360000
2018-09-06,0.380000
2020-03-05,0.380000
2025-12-05,0.150000
2014-03-14,0.300000
2016-09-07,0.380000
2024-12-06,0.120000
2026-03-06,0.180000
2026-06-05,0.180000
2015-12-16,0.360000
2018-03-08,0.380000
2018-12-06,0.380000
2025-09-05,0.150000
2014-06-06,0.300000
2018-06-07,0.380000
2019-03-07,0.380000
2023-06-01,0.090000
2024-06-07,0.120000
2024-09-06,0.120000
2015-03-09,0.300000
2016-03-09,0.380000
2016-06-08,0.380000
2016-12-05,0.380000
2017-12-07,0.380000
2024-02-29,0.120000
2019-09-05,0.380000
2022-08-30,0.090000
2023-08-31,0.090000
2023-11-30,0.090000
2014-12-08,0.300000
2019-06-06,0.380000
2019-12-05,0.380000
2022-12-01,0.090000
2025-06-06,0.150000