f/overrides/event-backup/fssnx-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
2012-12-14,0.161000
2014-12-19,0.472000
2012-06-08,0.081000
2016-12-16,0.261000
2020-06-05,0.041000
2021-12-10,1.012000
2023-12-15,0.274000
2018-06-08,0.134000
2019-12-13,0.554000
2014-06-06,0.128000
2017-06-09,0.215000
2017-12-15,0.530000
2019-06-07,0.069000
2023-06-23,0.085000
2024-12-20,0.250000
2015-06-05,0.213000
2026-06-26,0.053000
2021-06-04,0.068000
2024-06-28,0.034000
2013-06-07,0.090000
2016-06-10,0.156000
2018-12-14,0.795000
2020-12-11,0.193000
2022-12-16,0.273000
2025-12-19,0.335000
2013-12-13,0.232000
2015-12-18,0.418000