f/overrides/event-backup/cbhcx-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
2024-06-24,0.024000
2026-02-11,0.003000
2021-12-22,0.024000
2022-10-20,0.022000
2024-03-25,0.032000
2024-08-21,0.036000
2025-07-16,0.030000
2021-10-21,0.012000
2022-05-24,0.027000
2023-06-21,0.038000
2023-05-23,0.037000
2024-04-24,0.014000
2025-02-12,0.004000
2025-08-13,0.009000
2026-07-15,0.032000
2017-03-07,0.008000
2018-09-25,0.056000
2021-07-22,0.008000
2021-08-19,0.042000
2022-07-21,0.042000
2022-08-18,0.021000
2025-05-14,0.030000
2025-10-15,0.018000
2015-12-29,0.229000
2018-06-26,0.069000
2018-12-19,0.020000
2021-03-22,0.023000
2021-09-20,0.038000
2024-10-23,0.009000
2025-03-17,0.029000
2015-09-29,0.051000
2016-06-14,0.072000
2017-12-26,0.031000
2021-05-24,0.017000
2022-04-21,0.016000
2024-02-21,0.006000
2014-12-16,0.089000
2017-06-13,0.078000
2020-06-24,0.054000
2025-04-16,0.028000
2018-03-26,0.048000
2022-11-22,0.011000
2024-09-23,0.035000
2022-06-22,0.039000
2023-09-18,0.029000
2024-12-18,0.017000
2026-05-13,0.034000
2017-09-07,0.072000
2020-09-23,0.072000
2022-01-20,0.010000
2021-06-22,0.021000
2022-12-21,0.018000
2023-03-21,0.026000
2023-07-20,0.057000
2025-09-15,0.031000
2019-06-25,0.071000
2020-03-25,0.025000
2021-04-22,0.012000
2024-05-28,0.039000
2023-08-17,0.002000
2023-10-19,0.017000
2023-11-21,0.012000
2025-11-17,0.010000
2025-12-18,0.019000
2026-03-16,0.017000
2020-12-16,0.248000
2021-11-23,0.002000
2023-01-19,0.027000
2022-02-22,0.004000
2022-09-19,0.034000
2024-07-22,0.035000
2024-11-20,0.006000
2025-01-15,0.034000
2016-09-07,0.053000
2021-01-20,0.021000
2022-12-14,0.655000
2023-02-21,0.005000
2024-01-22,0.025000
2026-06-15,0.036000
2023-04-20,0.025000
2023-12-21,0.019000
2025-06-16,0.047000
2026-04-15,0.019000
2016-12-13,0.049000
2019-12-23,0.059000
2022-03-22,0.018000
2018-12-26,0.035000
2019-03-26,0.041000
2019-09-25,0.030000
2020-12-22,0.008000
2021-02-19,0.002000
2015-03-30,0.015000
2015-06-29,0.008000
2016-03-08,0.019000
2026-01-14,0.023000