f/overrides/event-backup/amdvx-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
2015-12-08,1.441000
2016-12-27,0.117000
2019-03-19,0.060000
2023-09-19,0.074000
2026-06-09,0.123000
2017-12-26,0.092000
2016-03-15,0.028000
2017-06-20,0.063000
2017-09-19,0.142000
2018-09-18,0.063000
2023-03-21,0.042000
2014-06-10,0.085000
2015-06-09,0.068000
2017-03-21,0.042000
2024-12-17,1.206000
2026-03-10,0.024000
2013-12-06,0.961000
2015-03-10,0.011000
2022-03-22,1.119000
2014-09-09,0.067000
2016-12-13,0.475000
2017-12-12,1.387000
2022-12-21,1.056000
2023-06-20,0.099000
2014-12-23,0.079000
2018-12-11,1.710000
2018-12-20,0.075000
2021-06-22,0.086000
2021-09-21,0.089000
2025-06-24,0.097000
2014-03-11,0.011000
2015-09-08,0.058000
2015-12-28,0.092000
2016-06-21,0.078000
2018-12-31,0.075000
2019-06-18,0.083000
2022-09-20,0.094000
2019-09-17,0.071000
2022-06-21,0.103000
2024-06-18,0.082000
2024-03-19,0.053000
2016-09-20,0.056000
2018-03-20,0.038000
2020-06-16,0.082000
2020-09-22,0.085000
2021-12-21,2.709000
2025-09-23,0.076000
2013-12-23,0.099000
2014-12-09,1.646000
2023-12-19,0.655000
2018-06-19,0.065000
2019-12-20,0.093000
2021-03-23,0.051000
2024-09-17,0.078000
2025-03-25,0.040000
2013-09-10,0.051000
2020-03-10,0.037000
2020-12-22,0.161000
2025-12-16,1.983000