f/overrides/event-backup/mdsix-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
2015-02-26,0.013000
2022-03-29,0.016000
2018-03-28,0.016000
2020-11-25,0.026000
2013-05-30,0.009000
2013-11-27,0.007000
2014-08-28,0.015000
2015-10-29,0.012000
2016-05-27,0.020000
2018-01-30,0.021000
2023-12-27,0.028000
2024-06-26,0.034000
2012-09-28,0.021000
2013-01-30,0.008000
2016-03-30,0.015000
2016-06-29,0.014000
2018-05-30,0.042000
2019-01-30,0.026000
2025-10-29,0.030000
2026-03-27,0.017000
2019-06-27,0.035000
2020-08-27,0.047000
2025-02-26,0.030000
2025-07-29,0.023000
2013-12-30,0.009000
2015-04-29,0.039000
2016-01-28,0.010000
2017-03-30,0.029000
2020-09-28,0.052000
2022-01-27,0.018000
2015-11-25,0.009000
2017-01-30,0.025000
2018-08-30,0.031000
2019-03-28,0.015000
2025-05-28,0.026000
2026-05-27,0.036000
2013-06-27,0.010000
2015-07-30,0.020000
2021-03-29,0.020000
2024-08-28,0.036000
2015-01-29,0.004000
2017-05-30,0.021000
2020-01-29,0.058000
2024-09-26,0.028000
2013-08-29,0.011000
2014-01-30,0.008000
2017-02-27,0.029000
2022-02-24,0.017000
2024-04-26,0.039000
2012-12-31,0.036000
2014-06-27,0.012000
2014-10-30,0.012000
2025-04-28,0.024000
2021-08-27,0.018000
2023-09-27,0.013000
2013-10-30,0.010000
2014-07-30,0.014000
2016-08-30,0.034000
2018-10-30,0.018000
2019-10-30,0.011000
2021-06-28,0.017000
2019-09-27,0.016000
2020-02-26,0.022000
2021-02-24,0.016000
2021-12-29,0.015000
2019-05-30,0.029000
2019-11-27,0.039000
2020-04-28,0.045000
2021-09-28,0.015000
2024-12-27,0.040000
2013-03-27,0.008000
2018-04-27,0.036000
2021-10-27,0.015000
2022-10-27,0.009000
2025-06-26,0.026000
2025-12-29,0.023000
2017-04-27,0.025000
2019-02-27,0.007000
2020-07-29,0.017000
2022-05-26,0.014000
2013-02-27,0.010000
2016-11-29,0.021000
2018-11-29,0.023000
2019-04-29,0.029000
2025-03-27,0.022000
2014-05-29,0.011000
2015-05-28,0.040000
2017-09-28,0.013000
2021-05-26,0.014000
2026-06-26,0.029000
2025-11-25,0.025000
2014-12-30,0.032000
2018-06-28,0.034000
2024-05-29,0.027000
2025-01-29,0.026000
2025-08-27,0.027000
2015-08-28,0.018000
2018-07-30,0.044000
2020-05-27,0.012000
2023-07-27,0.002000
2013-09-27,0.011000
2017-06-29,0.025000
2017-12-28,0.011000
2024-03-26,0.021000
2024-10-29,0.028000
2026-02-25,0.023000
2014-04-29,0.013000
2016-07-28,0.014000
2018-02-27,0.031000
2020-06-26,0.015000
2026-07-29,0.025000
2024-01-29,0.035000
2026-04-28,0.029000
2014-02-27,0.007000
2014-11-26,0.014000
2016-04-28,0.014000
2016-10-28,0.027000
2018-12-28,0.027000
2020-12-29,0.050000
2015-09-29,0.016000
2017-07-28,0.041000
2017-11-29,0.028000
2019-12-30,0.028000
2023-10-27,0.012000
2025-09-26,0.024000
2016-02-26,0.007000
2016-12-29,0.031000
2021-11-26,0.020000
2013-04-29,0.010000
2021-01-27,0.010000
2022-04-27,0.010000
2022-06-28,0.012000
2022-08-29,0.007000
2024-07-29,0.030000
2020-10-28,0.024000
2022-09-28,0.001000
2023-11-28,0.028000
2015-06-29,0.031000
2017-08-30,0.008000
2019-08-29,0.031000
2020-03-27,0.033000
2014-09-29,0.017000
2015-12-30,0.023000
2023-06-28,0.014000
2012-06-29,0.037000
2014-03-28,0.017000
2021-07-28,0.016000
2023-08-29,0.041000
2024-02-27,0.027000
2019-07-30,0.059000
2021-04-28,0.017000
2012-03-30,0.035000
2013-07-30,0.010000
2015-03-30,0.015000
2016-09-29,0.030000
2017-10-30,0.028000
2018-09-27,0.020000
2024-11-26,0.030000
2026-01-28,0.029000