f/overrides/event-backup/dwas-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
2013-12-20,0.014000
2015-06-19,0.026000
2015-12-18,0.047000
2025-06-23,0.010000
2012-12-21,0.221000
2022-06-21,0.132000
2024-09-23,0.515000
2024-12-23,0.073000
2025-03-24,0.052000
2025-09-22,0.005000
2020-09-21,0.026000
2022-12-19,0.139000
2021-09-20,0.028000
2022-09-19,0.260000
2023-09-18,0.124000
2013-03-15,0.011000
2014-06-20,0.011000
2014-12-19,0.007000
2016-03-18,0.012000
2017-12-18,0.082000
2024-03-18,0.049000
2016-12-16,0.151000
2019-09-23,0.013000
2019-12-23,0.063000
2020-03-23,0.041000
2020-12-21,0.023000
2023-03-20,0.055000
2013-06-21,0.038000
2017-09-18,0.014000
2022-03-21,0.061000
2024-06-24,0.082000
2016-06-17,0.049000
2018-03-19,0.019000
2020-06-22,0.068000
2021-06-21,0.041000
2021-12-20,0.071000
2023-06-20,0.179000
2023-12-18,0.834000