f/overrides/event-backup/jpst-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
2019-02-28,0.115000
2019-07-31,0.115000
2019-09-30,0.107000
2025-02-03,0.191000
2026-07-01,0.171000
2018-05-31,0.090000
2022-03-01,0.024000
2022-10-03,0.092000
2026-08-03,0.170000
2022-02-01,0.022000
2024-02-01,0.219000
2024-08-01,0.232000
2025-07-01,0.186000
2018-01-25,0.069000
2021-11-01,0.023000
2025-09-02,0.189000
2023-05-01,0.187000
2024-10-01,0.216000
2017-07-24,0.070000
2017-11-24,0.065000
2019-01-31,0.119000
2021-12-01,0.025000
2021-07-01,0.028000
2026-02-02,0.172000
2024-09-03,0.224000
2019-06-28,0.120000
2019-08-30,0.108000
2025-10-01,0.188000
2023-08-01,0.206000
2017-08-24,0.067000
2018-08-31,0.091000
2019-11-29,0.104000
2025-05-01,0.191000
2026-04-01,0.173000
2019-10-31,0.098000
2020-12-15,0.004000
2022-12-29,0.141000
2023-12-01,0.222000
2018-09-28,0.107000
2024-12-31,0.207000
2018-06-29,0.086000
2023-10-02,0.212000
2024-03-01,0.214000
2025-12-01,0.179000
2026-06-01,0.169000
2024-06-03,0.223000
2025-03-03,0.183000
2025-04-01,0.192000
2018-03-26,0.069000
2019-03-29,0.115000
2019-04-30,0.125000
2022-08-01,0.060000
2023-09-01,0.218000
2025-08-01,0.188000
2026-03-02,0.165000
2021-03-01,0.032000
2022-04-01,0.023000
2022-09-01,0.082000
2026-05-01,0.176000
2018-07-31,0.095000
2018-11-30,0.098000
2021-12-15,0.036000
2023-07-03,0.200000
2025-11-03,0.184000
2020-04-01,0.091000
2023-03-01,0.154000
2019-12-30,0.110000
2021-08-02,0.027000
2021-05-03,0.032000
2022-06-01,0.046000
2024-05-01,0.227000
2022-05-02,0.036000
2018-04-30,0.070000
2020-01-31,0.085000
2024-11-01,0.206000
2025-06-02,0.192000
2021-02-01,0.031000
2023-12-28,0.237000
2017-09-26,0.066000
2018-12-28,0.112000
2020-07-01,0.060000
2017-12-26,0.070000
2020-09-01,0.047000
2022-07-01,0.049000
2022-12-01,0.131000
2019-05-31,0.118000
2021-04-01,0.030000
2022-11-01,0.116000
2022-12-15,0.094000
2017-10-25,0.071000
2020-11-02,0.039000
2021-09-01,0.026000
2024-04-01,0.221000
2024-07-01,0.215000
2020-05-01,0.076000
2020-08-03,0.053000
2024-12-02,0.197000
2023-06-01,0.202000
2017-06-23,0.072000
2018-10-31,0.086000
2020-10-01,0.046000
2020-12-30,0.039000
2021-10-01,0.027000
2020-02-28,0.084000
2021-06-01,0.029000
2021-12-30,0.023000
2023-02-01,0.171000
2023-04-03,0.179000
2018-02-22,0.063000
2020-12-01,0.038000
2023-11-01,0.222000
2020-06-01,0.066000
2025-12-31,0.180000