f/overrides/event-backup/eqirx-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
2017-12-28,0.024000
2021-05-24,0.035000
2022-06-24,0.052000
2024-06-24,0.028000
2023-06-26,0.048000
2023-07-25,0.044000
2016-04-25,0.032000
2016-06-24,0.036000
2017-08-25,0.038000
2019-12-23,0.016000
2020-11-23,0.014000
2022-08-25,0.045000
2023-10-25,0.010000
2024-04-24,0.021000
2017-05-24,0.026000
2017-11-24,0.011000
2019-07-25,0.063000
2024-03-25,0.013000
2025-06-24,0.037000
2015-12-30,0.024000
2017-09-25,0.021000
2021-11-23,0.025000
2022-11-23,0.004000
2023-12-20,0.031000
2017-07-25,0.049000
2018-12-27,0.026000
2019-02-22,0.014000
2019-08-26,0.049000
2021-04-26,0.010000
2021-10-25,0.020000
2024-11-25,0.064000
2021-07-26,0.021000
2021-08-25,0.054000
2016-03-24,0.012000
2016-11-23,0.013000
2020-05-22,0.019000
2020-08-25,0.030000
2020-09-24,0.019000
2021-03-25,0.015000
2022-07-25,0.066000
2022-10-25,0.023000
2023-03-27,0.016000
2015-10-26,0.007000
2017-04-24,0.016000
2018-04-24,0.035000
2018-09-24,0.027000
2022-04-25,0.012000
2024-05-24,0.048000
2016-05-24,0.040000
2016-09-26,0.011000
2023-11-22,0.020000
2025-05-23,0.042000
2019-03-25,0.016000
2020-07-27,0.080000
2021-12-23,0.098000
2024-07-25,0.025000
2024-12-20,0.029000
2026-07-24,0.018000
2017-10-25,0.015000
2025-10-27,0.021000
2023-09-25,0.023000
2025-11-24,0.027000
2018-08-27,0.036000
2019-10-25,0.022000
2020-12-21,0.024000
2022-03-25,0.019000
2022-05-24,0.026000
2023-05-24,0.038000
2015-11-23,0.007000
2018-03-23,0.018000
2018-10-25,0.033000
2019-11-22,0.040000
2021-06-24,0.065000
2024-09-24,0.015000
2025-08-25,0.029000
2016-08-25,0.027000
2016-12-29,0.045000
2019-05-24,0.013000
2020-02-24,0.013000
2020-10-26,0.010000
2021-02-22,0.014000
2018-06-25,0.063000
2018-07-25,0.049000
2021-09-24,0.021000
2023-02-22,0.028000
2025-12-22,0.230000
2017-06-26,0.012000
2019-06-24,0.052000
2023-08-25,0.014000
2025-04-24,0.007000
2026-05-22,0.051000
2023-04-24,0.017000
2024-08-26,0.015000
2016-07-25,0.064000
2017-03-23,0.015000
2018-05-24,0.020000
2019-04-24,0.016000
2020-06-24,0.043000
2022-12-21,0.034000
2026-06-24,0.053000