f/overrides/event-backup/iei-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
2021-03-01,0.078000
2022-05-02,0.095000
2022-08-01,0.143000
2024-11-01,0.320000
2007-12-03,0.342000
2014-07-01,0.123000
2021-08-02,0.078000
2009-08-03,0.220000
2021-07-01,0.074000
2015-10-01,0.143000
2014-10-01,0.137000
2018-02-01,0.166000
2014-08-01,0.129000
2020-05-01,0.125000
2023-12-14,0.292000
2008-04-01,0.254000
2017-05-01,0.148000
2008-07-01,0.277000
2020-12-01,0.090000
2024-02-01,0.287000
2025-06-02,0.363000
2008-12-29,0.293000
2009-07-01,0.211000
2014-03-03,0.103000
2017-07-03,0.152000
2013-02-01,0.066000
2024-04-01,0.306000
2015-04-01,0.142000
2025-12-01,0.350000
2008-10-01,0.255000
2011-07-01,0.183000
2017-02-01,0.141000
2017-03-01,0.132000
2018-05-01,0.191000
2024-10-01,0.315000
2025-07-01,0.342000
2009-06-01,0.220000
2010-12-28,0.197000
2020-09-01,0.106000
2024-12-18,0.330000
2023-06-01,0.220000
2009-12-01,0.512000
2010-02-01,0.225000
2022-03-01,0.079000
2011-10-03,0.145000
2018-12-18,0.216000
2011-02-01,0.191000
2012-02-01,0.126000
2013-03-01,0.057000
2025-08-01,0.351000
2013-12-26,0.096000
2021-04-01,0.078000
2025-05-01,0.335000
2026-07-01,0.363000
2026-08-03,0.379000
2010-10-01,0.190000
2012-04-02,0.113000
2019-07-01,0.213000
2021-12-16,0.083000
2023-07-03,0.222000
2023-08-01,0.228000
2007-08-01,0.370000
2017-11-01,0.165000
2014-04-01,0.123000
2018-11-01,0.219000
2012-12-03,0.058000
2014-02-03,0.108000
2007-09-04,0.379000
2013-09-03,0.080000
2025-04-01,0.342000
2014-12-24,0.134000
2025-03-03,0.304000
2019-03-01,0.218000
2020-12-17,0.087000
2010-05-03,0.227000
2015-12-01,0.145000
2015-06-01,0.148000
2016-05-02,0.138000
2022-12-15,0.192000
2007-05-01,0.372000
2013-12-02,0.093000
2014-12-01,0.140000
2022-06-01,0.101000
2026-04-01,0.361000
2007-07-02,0.396000
2010-06-01,0.231000
2008-03-03,0.243000
2012-10-01,0.063000
2023-12-01,0.275000
2013-11-01,0.106000
2019-04-01,0.229000
2023-10-02,0.243000
2022-09-01,0.152000
2023-02-01,0.181000
2019-06-03,0.226000
2022-04-01,0.097000
2022-12-01,0.183000
2023-03-01,0.192000
2008-05-01,0.269000
2015-02-02,0.142000
2019-05-01,0.228000
2019-09-03,0.215000
2024-05-01,0.296000
2009-12-29,0.213000
2011-12-01,0.130000
2016-10-03,0.130000
2018-12-03,0.212000
2008-06-02,0.283000
2010-12-01,0.175000
2013-05-01,0.062000
2018-07-02,0.193000
2019-12-19,0.177000
2021-11-01,0.078000
2010-11-01,0.183000
2012-03-01,0.110000
2007-12-27,0.332000
2016-08-01,0.135000
2019-10-01,0.200000
2020-02-03,0.199000
2007-04-02,0.364000
2007-10-01,0.362000
2018-06-01,0.206000
2018-08-01,0.211000
2019-11-01,0.191000
2011-05-02,0.193000
2018-04-02,0.178000
2020-08-03,0.115000
2009-03-02,0.226000
2024-06-03,0.299000
2024-03-01,0.275000
2025-09-02,0.348000
2025-11-03,0.366000
2017-12-01,0.161000
2020-06-01,0.124000
2021-05-03,0.079000
2007-06-01,0.383000
2012-12-26,0.063000
2015-09-01,0.145000
2017-06-01,0.154000
2011-08-01,0.188000
2013-07-01,0.062000
2011-12-27,0.121000
2016-12-01,0.131000
2019-12-02,0.182000
2025-02-03,0.329000
2010-04-01,0.230000
2011-04-01,0.198000
2014-11-03,0.137000
2023-11-01,0.275000
2015-03-02,0.129000
2016-06-01,0.140000
2023-04-03,0.204000
2026-03-02,0.331000
2014-05-01,0.120000
2014-06-02,0.123000
2014-09-02,0.130000
2015-05-01,0.136000
2017-04-03,0.144000
2024-09-03,0.320000
2010-09-01,0.175000
2012-06-01,0.106000
2020-07-01,0.114000
2020-10-01,0.095000
2008-11-03,0.290000
2013-04-01,0.066000
2026-05-01,0.360000
2018-10-01,0.209000
2021-09-01,0.079000
2012-05-01,0.111000
2013-08-01,0.087000
2022-10-03,0.162000
2023-05-01,0.201000
2024-08-01,0.315000
2010-08-02,0.203000
2011-09-01,0.164000
2012-07-02,0.097000
2019-08-01,0.219000
2022-11-01,0.173000
2008-08-01,0.268000
2009-05-01,0.199000
2016-07-01,0.134000
2017-08-01,0.161000
2017-10-02,0.158000
2020-04-01,0.162000
2021-10-01,0.074000
2024-12-02,0.311000
2009-04-01,0.236000
2016-04-01,0.145000
2023-09-01,0.232000
2025-12-19,0.371000
2015-07-01,0.135000
2012-09-04,0.068000
2016-12-22,0.125000
2017-12-21,0.169000
2007-11-01,0.362000
2008-12-01,0.263000
2015-12-24,0.148000
2015-08-03,0.145000
2016-03-01,0.133000
2007-02-01,0.247000
2007-03-01,0.359000
2013-10-01,0.095000
2017-09-01,0.161000
2009-11-02,0.725000
2011-06-01,0.199000
2021-02-01,0.087000
2021-12-01,0.076000
2015-11-02,0.147000
2018-09-04,0.204000
2022-02-01,0.081000
2025-10-01,0.346000
2009-02-02,0.257000
2009-09-01,0.218000
2022-07-01,0.119000
2026-02-02,0.367000
2026-06-01,0.369000
2008-02-01,0.273000
2020-03-02,0.181000
2016-09-01,0.133000
2016-11-01,0.135000
2018-03-01,0.163000
2019-02-01,0.230000
2009-10-01,0.217000
2010-03-01,0.204000
2021-06-01,0.076000
2011-11-01,0.154000
2013-06-03,0.058000
2024-07-01,0.301000
2008-09-02,0.265000
2016-02-01,0.148000
2020-11-02,0.092000
2011-03-01,0.177000
2012-08-01,0.091000
2010-07-01,0.202000