f/overrides/event-backup/lpsgx-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
2009-06-30,0.007000
2019-06-28,0.123000
2022-07-14,0.168000
2008-09-30,0.068000
2012-09-28,0.070000
2017-09-29,0.086000
2021-12-31,3.196000
2024-12-24,2.332000
2011-06-30,0.218000
2017-03-31,0.051000
2018-09-28,0.087000
2023-12-22,0.396000
2026-07-22,0.174000
2016-09-30,0.061000
2020-06-30,0.318000
2020-09-30,0.102000
2009-03-31,0.037000
2019-03-28,0.029000
2021-03-31,0.158000
2010-06-30,0.157000
2014-09-30,0.074000
2015-09-30,0.102000
2020-03-31,0.060000
2011-09-30,0.048000
2014-06-30,0.658000
2016-12-30,0.171000
2019-12-31,1.052000
2015-12-30,1.257000
2009-12-31,0.645000
2021-06-30,0.577000
2022-06-30,0.093000
2025-07-17,0.162000
2025-12-29,1.478000
2008-12-31,0.068000
2012-06-29,0.163000
2012-12-31,0.499000
2013-03-28,0.054000
2014-12-31,2.254000
2018-06-29,0.534000
2023-06-30,0.131000
2011-03-31,0.043000
2016-06-30,0.119000
2018-03-29,0.094000
2019-09-27,0.076000
2020-12-31,0.082000
2010-09-30,0.045000
2013-12-31,1.344000
2017-06-30,0.105000
2009-09-30,0.056000
2016-03-31,0.069000
2018-12-31,2.009000
2011-12-30,0.492000
2014-03-31,0.100000
2024-06-28,0.419000
2010-03-31,0.045000
2010-12-31,0.249000
2013-09-30,0.080000
2017-12-29,1.070000
2012-03-30,0.055000
2013-06-28,0.169000
2015-03-31,0.066000
2015-06-30,0.261000
2022-03-31,0.223000
2023-03-31,0.056000
2023-09-29,0.097000