f/overrides/event-backup/mbovx-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
2011-06-23,0.038000
2012-06-21,0.090000
2013-06-20,0.173000
2014-06-19,0.150000
2022-12-29,0.835000
2025-06-13,0.099000
2013-12-27,1.373000
2017-12-28,0.898000
2019-12-27,0.634000
2018-06-18,0.094000
2020-06-15,0.130000
2020-12-29,0.220000
2021-06-16,0.001000
2023-12-28,0.322000
2024-06-13,0.006000
2024-12-30,1.712000
2025-12-30,1.249000
2026-06-15,0.177000
2018-12-27,1.099000
2019-06-17,0.006000
2021-12-29,0.236000
2023-06-15,0.218000