f/overrides/event-backup/asmdx-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
2016-06-21,0.027000
2016-12-20,0.079000
2020-06-23,0.015000
2024-03-26,0.017000
2013-12-17,0.601000
2014-09-09,0.025000
2014-12-16,0.600000
2015-12-22,0.449000
2022-06-28,0.037000
2023-12-21,0.057000
2024-12-20,0.293000
2014-03-11,0.009000
2017-12-19,0.651000
2019-09-17,0.040000
2021-06-29,0.029000
2017-06-20,0.036000
2022-09-27,0.011000
2023-03-28,0.010000
2024-06-25,0.038000
2013-09-10,0.027000
2013-12-23,0.039000
2014-06-10,0.022000
2015-09-08,0.020000
2025-06-26,0.050000
2024-09-24,0.045000
2025-09-25,0.022000
2015-06-09,0.010000
2019-12-20,0.817000
2022-12-28,0.278000
2023-06-27,0.053000
2025-03-27,0.010000
2014-03-18,0.004000
2017-09-19,0.030000
2017-12-26,0.055000
2021-09-28,0.033000
2026-06-11,0.049000
2014-12-23,0.031000
2015-12-28,0.043000
2016-12-27,0.038000
2018-12-20,0.053000
2018-12-18,0.567000
2021-12-28,0.698000
2023-09-26,0.027000
2018-09-18,0.036000
2019-06-18,0.036000
2020-09-29,0.027000
2020-12-29,0.323000
2015-03-10,0.006000
2016-09-20,0.021000
2017-03-21,0.010000
2018-06-19,0.026000
2025-12-19,0.409000