f/overrides/event-backup/fxc-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
2023-09-01,0.147000
2024-10-01,0.105000
2008-01-02,0.283000
2008-07-01,0.174000
2012-06-01,0.016000
2013-02-01,0.011000
2018-04-02,0.015000
2018-07-02,0.029000
2023-05-01,0.116000
2024-02-01,0.148000
2006-10-02,0.258000
2011-11-01,0.018000
2025-08-01,0.031000
2025-11-03,0.025000
2008-04-01,0.224000
2011-05-02,0.011000
2012-05-01,0.008000
2014-02-03,0.017000
2014-04-01,0.017000
2019-01-02,0.031000
2007-09-04,0.313000
2008-02-01,0.275000
2020-03-02,0.056000
2012-08-01,0.011000
2008-05-01,0.197000
2011-02-01,0.009000
2026-08-03,0.007000
2014-10-01,0.019000
2017-10-02,0.007000
2014-07-01,0.020000
2020-01-02,0.034000
2020-02-03,0.057000
2022-11-01,0.063000
2023-06-01,0.120000
2023-07-03,0.119000
2007-03-01,0.225000
2012-02-01,0.009000
2024-09-03,0.120000
2013-09-03,0.018000
2014-05-01,0.016000
2008-12-01,0.092000
2011-03-01,0.008000
2011-07-01,0.014000
2023-11-01,0.143000
2008-08-01,0.178000
2008-09-02,0.171000
2013-01-02,0.011000
2025-06-02,0.032000
2007-01-03,0.249000
2012-10-01,0.008000
2018-12-03,0.052000
2022-09-01,0.039000
2022-12-01,0.084000
2024-05-01,0.140000
2026-02-02,0.007000
2007-04-02,0.252000
2007-06-01,0.270000
2011-10-03,0.014000
2013-06-03,0.018000
2018-09-04,0.036000
2019-05-01,0.050000
2019-08-01,0.048000
2019-11-01,0.054000
2006-07-03,0.087000
2007-12-03,0.304000
2025-04-01,0.035000
2013-07-01,0.017000
2019-02-01,0.051000
2019-12-02,0.051000
2023-02-01,0.110000
2026-01-02,0.007000
2009-02-02,0.023000
2012-07-02,0.015000
2013-10-01,0.020000
2019-09-03,0.056000
2018-02-01,0.016000
2006-12-01,0.248000
2012-09-04,0.006000
2014-06-02,0.017000
2019-10-01,0.036000
2025-07-01,0.031000
2026-03-02,0.006000
2006-09-01,0.264000
2012-03-01,0.008000
2013-05-01,0.015000
2014-08-01,0.017000
2018-11-01,0.043000
2024-08-01,0.126000
2010-11-01,0.008000
2011-06-01,0.014000
2025-05-01,0.030000
2025-10-01,0.025000
2011-09-01,0.012000
2024-12-02,0.077000
2019-03-01,0.050000
2024-11-01,0.097000
2007-08-01,0.289000
2007-10-01,0.318000
2013-08-01,0.018000
2007-05-01,0.251000
2009-03-02,0.004000
2024-03-01,0.137000
2024-07-01,0.128000
2010-12-01,0.009000
2012-01-03,0.013000
2018-06-01,0.023000
2006-08-01,0.252000
2010-10-01,0.003000
2023-10-02,0.142000
2026-05-01,0.007000
2011-01-03,0.009000
2013-03-01,0.011000
2023-03-01,0.107000
2025-02-03,0.052000
2026-06-01,0.007000
2026-07-01,0.007000
2007-02-01,0.246000
2008-06-02,0.179000
2014-11-03,0.020000
2017-12-01,0.006000
2023-12-01,0.142000
2011-04-01,0.009000
2013-11-01,0.017000
2011-12-01,0.016000
2013-12-02,0.020000
2014-03-03,0.014000
2014-09-02,0.014000
2023-01-03,0.087000
2026-04-01,0.007000
2006-11-01,0.264000
2008-03-03,0.253000
2012-04-02,0.009000
2022-10-03,0.036000
2024-06-03,0.146000
2025-03-03,0.038000
2007-07-02,0.265000
2009-01-02,0.068000
2015-01-02,0.009000
2018-10-01,0.034000
2023-04-03,0.120000
2024-04-01,0.147000
2008-10-01,0.179000
2011-08-01,0.019000
2018-03-01,0.011000
2019-07-01,0.046000
2014-12-01,0.015000
2015-02-02,0.008000
2018-05-01,0.015000
2019-04-01,0.046000
2019-06-03,0.051000
2023-08-01,0.134000
2024-01-02,0.150000
2025-09-02,0.032000
2007-11-01,0.347000
2012-12-03,0.011000
2025-01-02,0.062000
2013-04-01,0.015000
2018-08-01,0.030000
2014-01-02,0.019000
2025-12-01,0.007000
2008-11-03,0.104000
2012-11-01,0.011000