f/overrides/event-backup/mbdlx-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
2020-09-28,0.017000
2021-01-27,0.017000
2022-03-29,0.014000
2024-02-27,0.024000
2015-08-26,0.016000
2016-10-26,0.018000
2020-02-26,0.021000
2021-02-24,0.015000
2020-08-27,0.016000
2024-06-26,0.026000
2025-04-28,0.028000
2025-10-29,0.031000
2016-12-27,0.018000
2018-09-26,0.020000
2016-03-28,0.018000
2021-10-27,0.012000
2022-07-27,0.018000
2023-02-24,0.020000
2024-11-26,0.027000
2025-11-25,0.027000
2017-04-25,0.018000
2022-04-27,0.014000
2019-09-26,0.021000
2023-06-28,0.022000
2017-12-27,0.021000
2019-04-26,0.021000
2020-10-28,0.017000
2021-07-28,0.013000
2023-03-29,0.022000
2024-05-29,0.027000
2024-08-28,0.027000
2019-01-29,0.020000
2019-10-29,0.022000
2019-12-16,0.025000
2023-04-26,0.021000
2016-08-26,0.018000
2017-07-26,0.018000
2023-07-27,0.023000
2024-04-26,0.026000
2026-01-28,0.029000
2016-09-27,0.018000
2019-02-26,0.021000
2017-09-26,0.018000
2018-07-27,0.019000
2018-10-29,0.020000
2020-11-25,0.016000
2022-06-28,0.016000
2025-05-28,0.029000
2015-06-25,0.015000
2017-01-26,0.017000
2026-07-29,0.031000
2025-06-26,0.028000
2016-04-26,0.018000
2023-11-28,0.025000
2019-08-28,0.021000
2019-06-26,0.021000
2021-06-28,0.013000
2023-09-27,0.023000
2015-10-27,0.019000
2018-11-28,0.021000
2025-02-26,0.027000
2025-09-26,0.028000
2021-09-28,0.012000
2024-09-26,0.027000
2025-08-27,0.029000
2020-03-27,0.020000
2020-06-26,0.017000
2022-08-29,0.019000
2022-11-28,0.020000
2017-11-27,0.018000
2019-07-29,0.022000
2020-05-27,0.019000
2022-01-27,0.006000
2015-12-28,0.255000
2017-10-26,0.018000
2020-12-16,0.016000
2021-08-27,0.013000
2025-01-29,0.028000
2026-02-25,0.028000
2026-05-27,0.031000
2017-03-28,0.020000
2017-06-27,0.018000
2019-05-29,0.023000
2019-11-26,0.023000
2023-08-29,0.023000
2024-03-26,0.026000
2015-05-26,0.015000
2016-07-26,0.019000
2018-01-29,0.017000
2018-05-29,0.020000
2022-10-27,0.020000
2024-01-29,0.024000
2016-05-25,0.018000
2017-08-28,0.018000
2022-12-15,0.023000
2023-05-26,0.022000
2026-06-26,0.030000
2019-03-27,0.022000
2022-09-28,0.019000
2020-07-29,0.017000
2022-05-26,0.016000
2018-03-27,0.019000
2018-04-26,0.017000
2018-06-27,0.019000
2021-11-26,0.013000
2024-07-29,0.027000
2015-09-25,0.019000
2016-01-26,0.016000
2016-06-27,0.018000
2018-08-29,0.020000
2022-02-24,0.012000
2023-01-27,0.020000
2024-10-29,0.027000
2025-12-16,0.030000
2015-07-28,0.016000
2015-11-24,0.019000
2017-05-25,0.018000
2025-07-29,0.029000
2021-04-28,0.011000
2021-12-15,0.270000
2020-01-29,0.019000
2020-04-28,0.019000
2021-03-29,0.015000
2023-12-14,0.026000
2024-12-16,0.027000
2025-03-27,0.028000
2018-02-26,0.019000
2018-12-27,0.025000
2026-03-27,0.032000
2026-04-28,0.031000
2017-02-23,0.018000
2016-02-24,0.016000
2016-11-25,0.018000
2021-05-26,0.012000
2023-10-27,0.024000