f/overrides/event-backup/gszux-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
2024-10-30,0.042000
2024-11-27,0.042000
2026-04-29,0.041000
2017-12-28,0.003000
2020-09-29,0.038000
2020-12-30,0.042000
2021-10-28,0.020000
2023-08-30,0.033000
2016-03-31,0.012000
2020-04-29,0.031000
2020-06-29,0.036000
2022-09-29,0.013000
2025-02-27,0.041000
2017-05-30,0.015000
2022-06-29,0.012000
2022-08-30,0.032000
2015-11-30,0.031000
2016-02-29,0.019000
2021-07-29,0.014000
2024-03-27,0.038000
2026-03-30,0.038000
2015-10-30,0.026000
2018-08-31,0.028000
2018-09-27,0.020000
2024-09-27,0.042000
2025-09-29,0.039000
2016-05-31,0.026000
2018-06-28,0.031000
2024-04-29,0.035000
2020-02-27,0.030000
2021-03-30,0.044000
2023-02-27,0.033000
2025-07-30,0.042000
2025-08-28,0.033000
2024-08-29,0.049000
2026-02-26,0.037000
2015-12-31,0.165000
2019-03-28,0.026000
2021-04-29,0.026000
2023-07-28,0.025000
2023-12-22,0.024000
2017-04-28,0.017000
2022-11-29,0.033000
2026-05-28,0.030000
2016-04-29,0.023000
2019-11-27,0.027000
2021-02-25,0.030000
2021-11-29,0.015000
2016-11-30,0.015000
2018-04-30,0.024000
2018-11-29,0.038000
2016-10-31,0.018000
2019-02-27,0.026000
2019-04-29,0.024000
2019-09-27,0.024000
2016-06-30,0.020000
2019-05-30,0.029000
2021-05-27,0.006000
2025-06-27,0.022000
2025-10-30,0.033000
2022-10-28,0.024000
2023-05-30,0.033000
2023-09-28,0.028000
2023-06-29,0.036000
2025-03-28,0.036000
2025-11-26,0.035000
2024-07-30,0.042000
2024-12-30,0.049000
2016-01-29,0.027000
2016-12-30,0.006000
2017-09-29,0.007000
2020-03-30,0.019000
2022-07-28,0.029000
2023-11-29,0.037000
2025-04-29,0.112000
2016-09-30,0.016000
2017-10-31,0.008000
2019-06-27,0.023000
2021-09-29,0.029000
2024-06-27,0.156000
2016-07-29,0.020000
2017-09-28,0.007000
2022-05-27,0.026000
2020-07-30,0.024000
2020-10-29,0.031000
2023-04-27,0.029000
2025-12-30,0.043000
2021-08-30,0.015000
2022-01-28,0.013000
2024-05-30,0.052000
2015-08-31,0.025000
2017-11-30,0.005000
2019-08-29,0.023000
2020-08-28,0.029000
2020-11-27,0.031000
2025-01-30,0.040000
2025-05-29,0.041000
2026-01-29,0.031000
2017-01-31,0.015000
2017-07-31,0.014000
2018-12-28,0.032000
2022-02-25,0.015000
2024-01-30,0.041000
2017-03-31,0.004000
2018-08-30,0.028000
2020-05-28,0.036000
2026-07-30,0.051000
2019-01-30,0.032000
2023-01-30,0.042000
2023-10-30,0.032000
2024-02-28,0.038000
2017-08-31,0.018000
2018-10-30,0.023000
2021-12-30,0.020000
2016-08-31,0.017000
2021-01-28,0.028000
2023-03-30,0.033000
2026-06-29,0.114000
2015-09-30,0.024000
2017-02-28,0.015000
2018-05-30,0.024000
2019-07-30,0.030000
2019-10-30,0.032000
2018-07-30,0.028000
2022-12-29,0.032000
2017-06-30,0.016000
2020-01-30,0.030000
2022-04-28,0.013000
2019-12-30,0.027000
2022-03-30,0.015000