f/overrides/event-backup/nsbfx-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
2015-06-30,0.153000
2015-09-30,0.154000
2015-12-30,0.164000
2021-06-30,0.186000
2022-03-31,0.176000
2026-03-31,0.188000
2014-06-30,0.157000
2015-03-31,0.150000
2023-03-31,0.185000
2025-03-31,0.191000
2013-12-30,0.154000
2016-09-30,0.162000
2020-06-30,0.169000
2025-12-15,4.978000
2020-03-31,0.191000
2024-03-28,0.181000
2024-09-30,0.181000
2016-03-31,0.160000
2019-03-29,0.181000
2019-12-16,3.108000
2021-03-31,0.202000
2024-06-28,0.200000
2024-12-16,3.468000
2025-09-30,0.178000
2016-12-29,0.170000
2013-06-28,0.142000
2015-12-15,1.420000
2016-06-30,0.141000
2017-03-31,0.170000
2017-12-15,1.229000
2018-08-22,1.751000
2019-09-30,0.204000
2023-12-15,0.933000
2023-12-28,0.206000
2024-12-30,0.191000
2026-05-14,1.535000
2013-09-30,0.146000
2014-09-30,0.148000
2017-06-30,0.157000
2018-03-29,0.157000
2023-09-29,0.191000
2025-12-30,0.207000
2013-12-13,0.192000
2017-12-28,0.150000
2018-12-17,0.296000
2018-12-28,0.137000
2020-09-30,0.188000
2026-06-30,0.161000
2014-12-15,1.065000
2018-09-28,0.182000
2019-12-30,0.252000
2020-12-15,1.516000
2021-12-30,0.141000
2018-06-29,0.188000
2019-06-28,0.183000
2021-11-09,1.409000
2022-06-30,0.167000
2014-12-30,0.142000
2017-09-29,0.177000
2020-12-30,0.162000
2022-09-30,0.189000
2022-12-29,0.768000
2014-03-31,0.152000
2021-09-30,0.202000
2022-12-15,0.565000
2023-06-30,0.191000
2025-06-30,0.202000