f/overrides/event-backup/istb-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
2018-02-01,0.091000
2024-10-01,0.158000
2013-03-01,0.022000
2015-08-03,0.071000
2022-08-01,0.076000
2022-10-03,0.087000
2023-07-03,0.116000
2014-11-03,0.057500
2021-03-01,0.076000
2018-08-01,0.110000
2019-04-01,0.119000
2019-12-02,0.111000
2022-09-01,0.080000
2022-11-01,0.094000
2023-09-01,0.115000
2013-08-01,0.024500
2013-12-26,0.027500
2024-03-01,0.140000
2016-08-01,0.086000
2018-07-02,0.101000
2021-08-02,0.068000
2022-03-01,0.060000
2022-07-01,0.075000
2024-02-01,0.140000
2015-03-02,0.060500
2015-09-01,0.066500
2024-12-02,0.163000
2020-12-01,0.077000
2023-03-01,0.102000
2014-06-02,0.038500
2020-10-01,0.090000
2024-12-18,0.159000
2026-04-01,0.175000
2018-04-02,0.102000
2020-06-01,0.096000
2021-04-01,0.075000
2022-04-01,0.066000
2022-12-01,0.093000
2023-02-01,0.103000
2015-04-01,0.066500
2015-12-01,0.070000
2025-11-03,0.172000
2025-05-01,0.164000
2025-08-01,0.170000
2015-11-02,0.067500
2026-06-01,0.172000
2016-12-01,0.083000
2019-12-19,0.100000
2023-12-01,0.134000
2024-04-01,0.150000
2015-05-01,0.068500
2016-06-01,0.080000
2017-12-01,0.093000
2019-07-01,0.119000
2020-04-01,0.111000
2024-09-03,0.160000
2013-10-01,0.027000
2014-08-01,0.046000
2020-11-02,0.083000
2015-06-01,0.068000
2018-05-01,0.103000
2024-06-03,0.150000
2024-11-01,0.159000
2015-12-24,0.055000
2017-04-03,0.086000
2026-02-02,0.172000
2017-12-21,0.047000
2023-08-01,0.116000
2021-06-01,0.071000
2018-11-01,0.116000
2020-08-03,0.092000
2014-04-01,0.033000
2016-05-02,0.079500
2014-02-03,0.032500
2018-12-18,0.101000
2017-09-01,0.092000
2019-02-01,0.119000
2020-02-03,0.110000
2021-11-01,0.065000
2024-05-01,0.146000
2025-03-03,0.157000
2014-10-01,0.055500
2016-09-01,0.088000
2025-12-01,0.169000
2014-12-01,0.059000
2025-10-01,0.168000
2015-02-02,0.060500
2015-10-01,0.063500
2019-08-01,0.117000
2013-07-01,0.023500
2013-09-03,0.026000
2016-07-01,0.083000
2019-03-01,0.116000
2026-03-02,0.166000
2026-05-01,0.172000
2012-12-26,0.019000
2013-11-01,0.031500
2017-11-01,0.093000
2013-12-02,0.030000
2014-07-01,0.042000
2021-12-01,0.088000
2022-12-15,0.099000
2026-07-01,0.171000
2017-05-01,0.088000
2018-03-01,0.093000
2026-08-03,0.174000
2019-09-03,0.115000
2025-04-01,0.166000
2016-10-03,0.080000
2017-06-01,0.089000
2018-09-04,0.111000
2019-06-03,0.120000
2020-03-02,0.109000
2021-02-01,0.079000
2014-03-03,0.033500
2014-09-02,0.051000
2021-12-16,0.058000
2022-06-01,0.073000
2021-05-03,0.072000
2021-10-01,0.068000
2016-02-01,0.076000
2018-06-01,0.106000
2019-05-01,0.118000
2020-05-01,0.101000
2023-10-02,0.124000
2025-12-19,0.170000
2014-05-01,0.036000
2015-07-01,0.067500
2021-07-01,0.065000
2023-04-03,0.107000
2024-08-01,0.155000
2014-12-24,0.050000
2017-02-01,0.085000
2020-09-01,0.088000
2023-12-14,0.146000
2016-12-22,0.049000
2017-10-02,0.092000
2022-02-01,0.064000
2023-05-01,0.109000
2024-07-01,0.151000
2025-06-02,0.171000
2020-07-01,0.098000
2021-09-01,0.065000
2020-12-17,0.080000
2023-11-01,0.130000
2013-02-01,0.019500
2016-11-01,0.082000
2022-05-02,0.068000
2023-06-01,0.112000
2025-02-03,0.163000
2019-10-01,0.112000
2019-11-01,0.118000
2013-05-01,0.026000
2017-03-01,0.085000
2017-07-03,0.089000
2018-12-03,0.115000
2025-07-01,0.168000
2012-12-03,0.024500
2013-04-01,0.021000
2018-10-01,0.112000
2025-09-02,0.171000
2013-06-03,0.022000
2017-08-01,0.090000