f/overrides/event-backup/fdis-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
2016-12-28,0.035000
2017-03-17,0.094000
2021-06-18,0.110000
2022-09-16,0.144000
2023-03-17,0.174000
2019-12-20,0.139000
2020-06-19,0.082000
2014-03-21,0.080000
2014-06-20,0.063000
2014-09-19,0.056000
2014-12-19,0.096000
2017-09-15,0.119000
2024-12-20,0.172000
2025-06-20,0.195000
2026-03-20,0.187000
2015-06-19,0.091000
2016-09-16,0.105000
2018-06-15,0.111000
2022-06-17,0.143000
2023-06-16,0.146000
2023-12-15,0.151000
2024-06-21,0.169000
2025-03-21,0.210000
2015-09-18,0.106000
2016-12-16,0.148000
2017-12-15,0.065000
2018-12-21,0.140000
2020-03-20,0.151000
2019-06-21,0.136000
2020-09-18,0.089000
2020-12-18,0.102000
2013-12-20,0.076000
2016-06-17,0.110000
2017-06-16,0.114000
2018-09-21,0.129000
2019-03-15,0.137000
2025-12-19,0.187000
2021-03-19,0.100000
2021-09-17,0.130000
2023-09-15,0.144000
2024-03-15,0.170000
2024-09-20,0.165000
2015-12-18,0.106000
2025-09-19,0.171000
2026-06-18,0.200000
2015-03-20,0.079000
2018-03-16,0.113000
2021-12-17,0.169000
2022-03-18,0.138000
2022-12-16,0.139000
2019-09-20,0.138000