f/overrides/event-backup/csb-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
2020-12-16,0.469000
2025-05-08,0.037000
2017-09-07,0.195000
2018-08-15,0.066000
2019-04-16,0.152000
2020-04-07,0.143000
2021-05-10,0.046000
2025-04-10,0.144000
2026-04-09,0.131000
2017-01-17,0.090000
2016-10-18,0.108000
2017-12-22,0.346000
2018-09-07,0.033000
2021-12-16,0.463000
2016-04-19,0.105000
2016-12-13,0.312000
2017-07-18,0.025000
2024-04-11,0.085000
2016-07-19,0.018000
2016-08-16,0.046000
2018-02-14,0.067000
2018-05-16,0.104000
2018-12-19,0.325000
2022-04-11,0.154000
2023-09-06,0.229000
2019-01-16,0.014000
2021-03-11,0.143000
2021-07-09,0.144000
2023-12-18,0.450000
2024-03-11,0.274000
2024-12-12,0.445000
2016-06-14,0.104000
2020-09-09,0.136000
2022-09-09,0.271000
2023-07-10,0.143000
2021-09-09,0.197000
2025-02-07,0.104000
2017-06-13,0.173000
2019-11-13,0.072000
2021-11-08,0.060000
2022-08-09,0.071000
2025-06-09,0.229000
2017-04-18,0.167000
2019-08-14,0.081000
2023-02-10,0.102000
2023-06-09,0.269000
2025-01-08,0.013000
2019-12-18,0.386000
2022-05-10,0.027000
2024-08-08,0.106000
2026-03-10,0.320000
2024-05-09,0.020000
2018-03-07,0.176000
2020-10-07,0.136000
2021-02-10,0.140000
2019-03-07,0.127000
2020-06-10,0.183000
2020-11-12,0.084000
2022-10-11,0.122000
2022-12-16,0.508000
2017-10-17,0.128000
2018-04-17,0.166000
2018-10-17,0.115000
2022-03-11,0.170000
2022-07-11,0.143000
2025-03-10,0.247000
2026-07-09,0.176000
2022-06-10,0.226000
2023-03-10,0.167000
2016-09-07,0.171000
2016-11-15,0.058000
2017-05-16,0.046000
2021-06-10,0.135000
2022-11-08,0.078000
2023-08-08,0.044000
2024-06-12,0.205000
2020-05-13,0.155000
2026-01-08,0.010000
2017-08-15,0.050000
2018-01-17,0.021000
2021-01-12,0.026000
2023-05-10,0.048000
2025-10-09,0.222000
2026-06-09,0.249000
2017-02-14,0.046000
2019-07-17,0.118000
2021-04-09,0.253000
2021-08-09,0.073000
2022-01-12,0.023000
2019-06-13,0.139000
2020-07-08,0.108000
2023-10-11,0.204000
2025-11-07,0.060000
2025-12-11,0.488000
2026-08-07,0.090000
2018-11-14,0.055000
2019-05-15,0.071000
2020-02-12,0.015000
2026-05-08,0.004000
2018-07-17,0.129000
2025-09-08,0.263000
2019-02-13,0.093000
2024-11-07,0.085000
2019-09-10,0.139000
2022-02-10,0.064000
2024-07-10,0.119000
2017-03-07,0.110000
2019-10-15,0.108000
2023-04-11,0.149000
2024-10-08,0.141000
2016-02-16,0.063000
2017-11-15,0.047000
2018-06-13,0.126000
2020-03-11,0.189000
2025-08-06,0.095000
2023-11-08,0.124000
2025-07-10,0.169000
2026-02-09,0.061000
2016-05-17,0.061000
2020-08-12,0.230000
2021-10-08,0.229000
2024-02-09,0.107000
2024-09-11,0.265000