f/overrides/event-backup/nwjex-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
2014-03-14,0.058000
2016-09-12,0.070000
2018-03-09,0.029000
2019-09-09,0.276000
2019-12-18,1.432000
2021-09-07,0.177000
2024-12-19,31.481000
2025-03-10,0.182000
2025-06-09,0.211000
2026-03-18,0.248000
2015-03-13,0.102000
2018-12-18,1.870000
2023-06-12,0.232000
2025-09-08,0.175000
2016-06-10,0.094000
2019-03-08,0.231000
2020-06-08,0.394000
2020-09-08,0.189000
2022-09-12,0.225000
2026-06-17,0.207000
2014-06-13,0.053000
2023-03-13,0.275000
2023-09-11,0.164000
2023-12-20,0.157000
2023-12-21,6.213000
2014-12-16,0.361000
2017-06-09,0.162000
2018-06-08,0.182000
2020-12-21,5.390000
2021-06-07,0.259000
2022-06-06,0.305000
2024-06-10,0.242000
2013-12-13,0.284000
2014-09-16,0.033000
2015-09-10,0.036000
2016-03-11,0.104000
2018-09-10,0.173000
2019-06-07,0.303000
2021-12-21,11.539000
2024-09-09,0.236000
2016-12-16,0.389000
2017-03-10,0.081000
2017-09-11,0.120000
2021-03-08,0.174000
2022-03-07,0.293000
2025-12-18,4.832000
2015-06-12,0.074000
2015-12-17,0.323000
2017-12-18,2.906000
2020-03-09,0.231000
2022-12-21,15.460000
2024-03-11,0.233000