f/overrides/event-backup/dcmsx-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
2018-12-18,0.079000
2022-09-29,0.015000
2025-12-15,0.409000
2017-06-29,0.013000
2012-12-13,0.036000
2013-09-10,0.002000
2014-12-16,0.069000
2017-03-30,0.012000
2025-06-27,0.039000
2026-03-30,0.017000
2011-12-13,0.032000
2012-09-10,0.013000
2020-03-30,0.003000
2022-12-14,0.350000
2025-09-29,0.022000
2021-12-15,2.152000
2023-09-28,0.018000
2023-12-13,0.092000
2024-03-27,0.004000
2016-03-30,0.009000
2019-06-27,0.026000
2011-03-08,0.005000
2011-06-08,0.009000
2013-12-12,0.025000
2014-03-10,0.013000
2012-06-08,0.021000
2014-06-09,0.010000
2017-12-15,0.149000
2020-12-16,0.017000
2018-09-27,0.006000
2019-03-28,0.001000
2019-12-17,0.057000
2022-06-29,0.002000
2013-06-10,0.018000
2016-06-29,0.008000
2016-09-29,0.008000
2017-09-28,0.011000
2024-06-27,0.015000
2024-09-27,0.039000
2026-06-29,0.042000
2011-09-08,0.013000
2016-12-15,0.048000
2024-12-13,0.070000
2025-03-28,0.029000