f/overrides/event-backup/itiox-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
2020-03-25,0.006000
2023-01-26,0.019000
2024-03-21,0.011000
2026-06-23,0.038000
2017-06-28,0.023000
2021-01-28,0.005000
2022-12-21,0.206000
2026-03-20,0.012000
2024-05-23,0.025000
2025-06-23,0.039000
2017-08-30,0.009000
2020-04-29,0.010000
2020-09-25,0.018000
2021-12-21,0.085000
2022-09-27,0.034000
2018-05-30,0.029000
2023-05-25,0.029000
2024-12-23,0.022000
2014-12-23,0.029000
2017-03-28,0.021000
2018-09-25,0.008000
2024-09-23,0.028000
2018-11-29,0.037000
2020-01-29,0.007000
2020-02-26,0.012000
2023-12-21,0.025000
2025-08-26,0.040000
2018-06-26,0.032000
2018-07-30,0.032000
2014-07-30,0.013000
2024-10-25,0.030000
2026-04-29,0.012000
2018-12-19,0.034000
2019-11-26,0.012000
2023-06-26,0.033000
2025-09-24,0.039000
2014-06-25,0.033000
2014-11-25,0.012000
2021-08-26,0.062000
2022-04-27,0.032000
2025-02-27,0.020000
2018-03-26,0.014000
2021-10-28,0.052000
2026-05-28,0.019000
2023-08-29,0.028000
2017-04-27,0.017000
2019-07-30,0.028000
2019-08-28,0.010000
2021-02-25,0.013000
2021-07-29,0.041000
2022-01-27,0.032000
2024-04-25,0.018000
2021-06-25,0.031000
2022-07-28,0.040000
2016-12-20,0.016000
2020-10-28,0.020000
2020-12-21,0.030000
2021-05-27,0.013000
2022-08-25,0.043000
2025-10-28,0.034000
2025-11-25,0.039000
2017-05-30,0.013000
2023-03-27,0.025000
2021-09-27,0.063000
2023-11-21,0.032000
2017-11-29,0.046000
2026-02-25,0.005000
2017-07-28,0.011000
2019-12-19,0.026000
2024-07-25,0.029000
2017-10-30,0.019000
2023-10-26,0.027000
2014-09-25,0.004000
2018-04-26,0.022000
2019-10-30,0.004000
2022-02-24,0.029000
2022-03-25,0.037000
2024-06-21,0.030000
2025-04-29,0.031000
2018-08-30,0.030000
2019-05-29,0.022000
2025-01-28,0.020000
2025-03-21,0.025000
2018-10-30,0.011000
2019-09-25,0.005000
2023-04-27,0.028000
2014-05-29,0.033000
2014-08-28,0.025000
2018-02-27,0.008000
2020-11-24,0.028000
2014-04-29,0.026000
2022-11-22,0.023000
2025-05-29,0.033000
2018-01-26,0.005000
2019-06-25,0.027000
2022-06-24,0.038000
2022-10-27,0.006000
2023-07-27,0.029000
2016-11-22,0.017000
2021-11-23,0.038000
2023-09-25,0.026000
2024-08-28,0.031000
2026-07-30,0.045000
2022-05-26,0.032000
2024-11-26,0.033000
2025-07-30,0.038000
2025-12-19,0.034000