f/overrides/event-backup/ivsyx-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
2015-10-15,0.020000
2025-02-21,0.023000
2009-01-15,0.010000
2014-07-10,0.026000
2020-09-10,0.025000
2025-05-22,0.027000
2021-06-10,0.022000
2010-07-15,0.030000
2018-05-10,0.015000
2019-10-10,0.016000
2020-02-13,0.016000
2021-12-16,0.038000
2009-02-12,0.013000
2010-01-14,0.015000
2013-12-12,0.081000
2019-07-11,0.016000
2020-10-15,0.025000
2023-03-22,0.010000
2024-07-22,0.026000
2010-09-16,0.029000
2011-04-14,0.028000
2020-06-11,0.016000
2016-06-16,0.015000
2019-04-11,0.016000
2024-03-22,0.027000
2011-12-08,0.133000
2013-08-15,0.026000
2020-11-12,0.025000
2023-09-22,0.026000
2018-12-13,0.091000
2025-04-22,0.022000
2009-08-13,0.018000
2015-02-12,0.020000
2015-12-10,0.067000
2016-09-15,0.015000
2017-11-16,0.015000
2021-07-15,0.022000
2017-01-12,0.007000
2025-03-21,0.026000
2016-08-11,0.015000
2016-02-11,0.015000
2024-10-22,0.013000
2025-09-22,0.019000
2011-01-13,0.028000
2019-02-14,0.016000
2009-11-12,0.022000
2016-04-14,0.015000
2022-09-15,0.019000
2023-11-22,0.026000
2024-11-22,0.013000
2009-03-12,0.015000
2019-01-10,0.012000
2019-09-12,0.016000
2022-04-14,0.007000
2025-10-22,0.018000
2011-05-12,0.028000
2013-10-10,0.026000
2020-01-16,0.014000
2020-08-13,0.016000
2021-09-16,0.022000
2018-02-15,0.015000
2021-01-14,0.010000
2010-05-13,0.030000
2017-12-14,0.047000
2013-06-13,0.026000
2024-08-22,0.027000
2025-06-20,0.021000
2026-02-20,0.016000
2012-02-16,0.030000
2013-04-11,0.029000
2016-05-12,0.015000
2020-12-10,0.062000
2019-03-14,0.016000
2025-01-22,0.017000
2009-04-16,0.016000
2015-06-11,0.020000
2016-10-13,0.015000
2018-07-12,0.015000
2018-09-13,0.025000
2023-04-21,0.026000
2024-02-22,0.025000
2026-06-22,0.024000
2009-12-10,0.073000
2017-06-15,0.015000
2017-10-10,0.015000
2009-10-15,0.020000
2012-09-13,0.031000
2015-08-13,0.020000
2018-01-11,0.012000
2018-10-11,0.025000
2024-09-20,0.017000
2011-02-10,0.015000
2012-11-15,0.031000
2025-07-22,0.013000
2017-03-16,0.015000
2022-10-13,0.018000
2014-08-14,0.026000
2014-12-11,0.068000
2015-11-12,0.020000
2019-11-14,0.016000
2020-03-12,0.016000
2008-12-11,0.230000
2017-09-14,0.015000
2024-04-22,0.026000
2015-07-16,0.020000
2016-11-10,0.015000
2022-11-10,0.018000
2013-07-11,0.026000
2013-11-14,0.026000
2024-12-13,0.055000
2012-08-16,0.031000
2021-05-13,0.022000
2010-10-14,0.029000
2016-03-10,0.015000
2017-02-09,0.015000
2019-12-12,0.025000
2022-05-12,0.014000
2012-03-15,0.030000
2022-02-10,0.015000
2019-05-16,0.016000
2012-01-12,0.015000
2014-02-13,0.026000
2022-01-13,0.007000
2023-01-20,0.025000
2016-01-14,0.015000
2011-07-14,0.028000
2022-06-07,0.016000
2011-06-16,0.028000
2014-10-16,0.026000
2018-03-15,0.015000
2021-03-11,0.022000
2023-08-22,0.029000
2014-04-10,0.026000
2018-06-14,0.015000
2025-12-12,0.122000
2026-04-22,0.016000
2026-07-22,0.026000
2010-11-11,0.029000
2011-08-11,0.028000
2015-01-15,0.006000
2017-07-13,0.015000
2022-12-15,0.125000
2010-08-12,0.029000
2014-01-16,0.013000
2014-11-13,0.026000
2016-07-14,0.015000
2022-07-14,0.018000
2023-07-21,0.025000
2026-01-22,0.016000
2023-05-22,0.029000
2010-12-09,0.094000
2014-06-12,0.026000
2014-09-11,0.026000
2017-05-11,0.015000
2021-08-12,0.022000
2009-06-11,0.018000
2012-04-12,0.030000
2026-03-20,0.015000
2013-09-12,0.026000
2019-06-13,0.016000
2020-04-16,0.016000
2020-07-16,0.016000
2011-09-15,0.028000
2013-03-14,0.031000
2014-03-13,0.019000
2021-04-15,0.022000
2015-09-10,0.020000
2025-11-21,0.017000
2009-09-10,0.018000
2012-12-13,0.134000
2009-05-14,0.017000
2011-11-10,0.029000
2021-10-14,0.022000
2025-08-22,0.015000
2012-06-14,0.030000
2012-07-12,0.030000
2019-08-15,0.016000
2022-08-11,0.018000
2010-03-11,0.030000
2010-06-10,0.030000
2011-10-13,0.028000
2017-08-10,0.015000
2023-10-20,0.026000
2026-05-22,0.023000
2010-02-11,0.030000
2016-12-08,0.043000
2017-04-13,0.015000
2020-05-14,0.016000
2012-10-11,0.031000
2018-08-16,0.025000
2023-06-22,0.027000
2024-06-21,0.026000
2013-01-10,0.010000
2021-11-11,0.022000
2022-03-10,0.016000
2024-05-22,0.027000
2014-05-15,0.026000
2015-04-16,0.020000
2021-02-11,0.022000
2011-03-10,0.028000
2013-05-16,0.028000
2018-04-12,0.015000
2012-05-10,0.030000
2018-11-15,0.025000
2013-02-14,0.031000
2015-05-14,0.020000
2009-07-16,0.007000
2015-03-12,0.020000
2024-01-22,0.044000