f/overrides/event-backup/gstux-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
2021-03-31,0.008000
2026-06-30,0.027000
2017-07-31,0.017000
2020-03-31,0.017000
2020-09-30,0.011000
2019-01-31,0.023000
2023-05-31,0.022000
2025-04-30,0.024000
2016-07-29,0.019000
2022-11-30,0.016000
2019-05-31,0.020000
2024-02-29,0.023000
2020-08-31,0.011000
2021-05-28,0.007000
2022-07-29,0.013000
2021-01-29,0.008000
2017-12-29,0.018000
2020-06-30,0.011000
2024-08-30,0.025000
2023-06-30,0.024000
2025-03-31,0.025000
2026-07-31,0.027000
2022-02-28,0.007000
2023-04-28,0.022000
2025-02-28,0.023000
2026-04-30,0.026000
2018-06-29,0.019000
2018-12-31,0.023000
2019-07-31,0.020000
2019-06-28,0.019000
2021-10-29,0.004000
2021-12-31,0.005000
2022-05-31,0.010000
2023-09-29,0.024000
2015-12-31,0.007000
2016-10-31,0.014000
2019-10-31,0.021000
2016-03-31,0.016000
2019-02-28,0.019000
2025-12-31,0.027000
2020-10-30,0.009000
2022-08-31,0.015000
2023-12-29,0.025000
2025-08-29,0.027000
2016-02-29,0.004000
2017-05-31,0.018000
2017-09-29,0.016000
2017-10-31,0.017000
2015-08-31,0.010000
2015-09-30,0.009000
2016-01-29,0.005000
2020-02-28,0.019000
2021-07-30,0.004000
2023-03-31,0.022000
2024-12-31,0.025000
2026-02-27,0.025000
2018-02-28,0.017000
2020-05-29,0.013000
2024-04-30,0.025000
2022-01-31,0.004000
2023-02-28,0.019000
2018-01-31,0.017000
2019-04-30,0.020000
2021-09-30,0.004000
2020-04-30,0.014000
2022-09-30,0.016000
2022-12-30,0.018000
2026-03-31,0.027000
2017-01-31,0.011000
2017-11-30,0.018000
2019-09-30,0.019000
2016-12-30,0.015000
2023-11-30,0.024000
2024-01-31,0.024000
2020-07-31,0.010000
2021-08-31,0.004000
2021-11-30,0.005000
2022-03-31,0.008000
2023-08-31,0.024000
2016-06-30,0.020000
2017-04-28,0.019000
2019-11-29,0.021000
2023-10-31,0.024000
2021-02-26,0.009000
2024-05-31,0.025000
2017-08-31,0.017000
2018-08-31,0.019000
2020-11-30,0.009000
2019-03-29,0.021000
2021-04-30,0.008000
2023-07-31,0.024000
2018-03-29,0.019000
2025-09-30,0.026000
2026-01-30,0.027000
2026-05-29,0.027000
2017-02-28,0.014000
2017-03-31,0.019000
2017-06-30,0.019000
2018-11-30,0.021000
2025-06-30,0.026000
2016-04-29,0.016000
2024-03-28,0.025000
2025-01-31,0.025000
2025-07-31,0.027000
2025-11-28,0.026000
2016-08-31,0.018000
2019-12-31,0.021000
2024-09-30,0.024000
2016-11-30,0.016000
2022-04-29,0.008000
2023-01-31,0.018000
2024-07-31,0.025000
2025-10-31,0.027000
2020-12-31,0.009000
2022-06-30,0.012000
2022-10-31,0.017000
2020-01-31,0.020000
2025-05-30,0.026000
2015-10-30,0.007000
2018-04-30,0.019000
2018-10-31,0.021000
2024-06-28,0.025000
2024-10-31,0.024000
2015-11-30,0.005000
2016-09-30,0.011000
2018-09-28,0.020000
2024-11-29,0.024000
2016-05-31,0.021000
2018-05-31,0.020000
2024-03-26,0.001000
2018-07-31,0.019000
2019-08-30,0.019000
2021-06-30,0.005000