f/overrides/event-backup/cppcx-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
2019-04-25,0.010000
2023-03-29,0.016000
2023-12-27,0.031000
2024-03-25,0.023000
2019-02-25,0.008000
2019-05-28,0.013000
2019-08-27,0.008000
2023-02-24,0.009000
2015-01-27,0.003000
2025-09-25,0.027000
2015-09-24,0.003000
2017-05-24,0.002000
2020-08-26,0.001000
2025-04-25,0.024000
2012-11-28,0.006000
2012-12-27,0.003000
2013-11-27,0.003000
2014-01-28,0.003000
2025-11-24,0.021000
2017-06-22,0.003000
2022-09-28,0.008000
2023-04-26,0.019000
2024-12-27,0.036000
2020-01-28,0.005000
2021-08-27,0.001000
2013-07-29,0.003000
2014-06-25,0.002000
2018-02-22,0.002000
2019-07-26,0.010000
2022-01-27,0.003000
2013-06-26,0.002000
2014-04-25,0.001000
2016-08-23,0.003000
2019-11-26,0.006000
2024-06-25,0.024000
2025-10-28,0.025000
2026-02-24,0.020000
2026-06-25,0.025000
2012-07-27,0.003000
2013-08-28,0.002000
2018-01-25,0.003000
2023-05-26,0.017000
2024-09-25,0.028000
2025-07-28,0.026000
2015-07-27,0.004000
2015-12-29,0.009000
2019-03-26,0.007000
2023-09-27,0.020000
2012-06-27,0.007000
2019-12-27,0.023000
2022-10-27,0.005000
2014-05-28,0.001000
2020-05-26,0.006000
2021-12-29,0.029000
2024-05-28,0.028000
2026-01-27,0.015000
2024-10-28,0.025000
2025-02-25,0.024000
2017-11-21,0.003000
2022-03-29,0.002000
2022-04-27,0.005000
2022-07-27,0.009000
2015-04-24,0.003000
2019-01-28,0.005000
2019-09-25,0.008000
2025-03-26,0.027000
2013-12-27,0.003000
2016-06-23,0.006000
2022-06-28,0.008000
2026-05-26,0.023000
2013-09-26,0.002000
2020-06-25,0.002000
2021-09-28,0.001000
2024-04-25,0.026000
2015-06-25,0.004000
2017-10-25,0.002000
2025-05-27,0.026000
2026-07-28,0.024000
2017-07-24,0.002000
2017-08-22,0.001000
2023-07-27,0.023000
2026-04-27,0.023000
2013-01-29,0.003000
2013-04-26,0.003000
2014-12-29,0.001000
2016-12-28,0.027000
2014-11-25,0.002000
2015-05-27,0.004000
2020-02-25,0.005000
2022-05-26,0.009000
2022-11-28,0.008000
2022-12-28,0.045000
2012-10-31,0.003000
2015-10-27,0.003000
2018-05-23,0.007000
2018-09-25,0.006000
2023-01-27,0.008000
2026-03-26,0.025000
2014-07-28,0.002000
2013-02-26,0.002000
2023-06-28,0.018000
2024-11-25,0.024000
2016-11-22,0.002000
2025-06-25,0.026000
2020-03-26,0.007000
2018-06-26,0.008000
2018-08-24,0.009000
2019-10-28,0.008000
2021-01-27,0.001000
2014-03-26,0.003000
2018-12-27,0.011000
2020-04-27,0.012000
2020-10-27,0.001000
2013-03-27,0.003000
2013-05-29,0.003000
2013-10-29,0.002000
2014-02-25,0.002000
2023-08-29,0.022000
2023-11-28,0.024000
2022-08-29,0.015000
2025-01-28,0.017000
2017-04-21,0.005000
2018-11-23,0.007000
2019-06-25,0.009000
2020-12-23,0.123000
2017-01-26,0.001000
2025-08-26,0.024000
2018-03-26,0.006000
2018-07-24,0.009000
2024-01-26,0.016000
2024-02-26,0.023000
2015-11-24,0.001000
2016-01-26,0.001000
2016-07-25,0.005000
2017-03-23,0.004000
2024-07-26,0.030000
2018-04-23,0.009000
2018-10-24,0.007000
2023-10-27,0.026000
2024-08-27,0.026000
2015-08-25,0.004000
2016-03-24,0.001000
2016-04-22,0.001000
2016-05-25,0.001000
2025-12-29,0.034000