f/overrides/event-backup/cemfx-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
2022-09-29,0.175000
2026-03-30,0.073000
2014-03-28,0.031000
2014-12-30,0.060000
2015-06-29,0.098000
2019-09-27,0.153000
2021-09-29,0.155000
2018-03-28,0.046000
2019-12-20,0.093000
2020-06-29,0.091000
2022-03-30,0.072000
2025-12-18,0.089000
2017-03-30,0.015000
2017-06-29,0.101000
2017-12-28,0.097000
2023-12-21,0.172000
2026-06-29,0.134000
2021-06-29,0.116000
2022-12-22,0.053000
2013-03-27,0.024000
2013-12-30,0.022000
2014-06-27,0.097000
2020-09-29,0.094000
2020-12-22,0.018000
2024-12-19,0.111000
2025-06-27,0.081000
2013-06-27,0.041000
2016-09-29,0.128000
2018-06-28,0.078000
2022-06-29,0.175000
2023-09-28,0.151000
2021-03-30,0.041000
2023-06-29,0.182000
2025-09-29,0.087000
2013-09-27,0.087000
2016-03-30,0.005000
2016-12-29,0.120000
2017-09-28,0.202000
2018-09-27,0.173000
2023-03-30,0.051000
2024-06-27,0.112000
2024-09-27,0.194000
2012-12-28,0.049000
2015-09-29,0.297000
2015-12-30,0.021000
2016-06-29,0.086000
2020-03-30,0.041000
2025-03-28,0.021000
2025-12-30,0.021000
2014-09-29,0.186000
2019-03-28,0.085000
2019-06-27,0.119000