f/overrides/event-backup/iscg-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
2018-03-22,0.023500
2018-09-26,0.017667
2019-06-17,0.017833
2023-09-26,0.103000
2023-12-20,0.084000
2024-12-17,0.210000
2008-09-25,0.004167
2015-09-25,0.030167
2011-06-23,0.006500
2013-03-25,0.018833
2013-12-23,0.036667
2014-12-24,0.046167
2016-03-23,0.027667
2025-03-18,0.066000
2008-06-24,0.003333
2010-06-23,0.000500
2008-12-24,0.038167
2021-03-25,0.008167
2014-09-24,0.022000
2017-12-19,0.049500
2020-03-25,0.009833
2020-12-14,0.015167
2021-09-24,0.110000
2012-09-25,0.034667
2012-12-19,0.133500
2017-06-27,0.034667
2017-09-26,0.020667
2022-09-26,0.119000
2015-06-24,0.033333
2016-12-21,0.178000
2021-12-13,0.123000
2022-03-24,0.041000
2023-06-07,0.072000
2025-09-16,0.087000
2005-09-26,0.001167
2007-12-27,0.006667
2023-03-23,0.079000
2024-09-25,0.087000
2025-12-16,0.108000
2015-03-25,0.040000
2016-09-26,0.037333
2011-09-26,0.013333
2020-06-15,0.026000
2015-12-24,0.040833
2018-12-17,0.029167
2007-06-29,0.016167
2008-03-25,0.014833
2018-06-26,0.040000
2019-12-16,0.041500
2022-06-09,0.056000
2011-03-25,0.012000
2017-03-24,0.050500
2019-03-20,0.012000
2026-03-17,0.078000
2010-09-24,0.005000
2012-06-19,0.019833
2022-12-13,0.115000
2009-09-23,0.001333
2013-09-24,0.029167
2013-06-26,0.032167
2009-06-23,0.002667
2010-12-23,0.024000
2016-06-21,0.043167
2021-06-10,0.069000
2024-06-11,0.058000
2007-09-26,0.003667
2011-12-22,0.011833
2019-09-24,0.024333
2025-06-16,0.080000
2014-03-25,0.028333
2014-06-24,0.029167
2012-03-26,0.025333
2024-03-21,0.059000
2026-06-15,0.099000
2009-12-24,0.005333
2010-03-25,0.004333