f/overrides/event-backup/nugax-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
2021-12-30,0.146000
2023-03-31,0.087000
2013-03-28,0.105000
2014-12-15,0.301000
2015-06-30,0.240000
2016-03-31,0.085000
2017-06-30,0.666000
2021-09-30,0.115000
2024-12-16,2.212000
2026-03-31,0.058000
2012-12-28,0.309000
2013-12-30,0.087000
2014-06-30,0.249000
2015-09-30,0.106000
2018-03-29,0.063000
2019-03-29,0.106000
2020-03-31,0.110000
2018-06-29,0.213000
2019-06-28,0.199000
2019-12-30,0.064000
2023-06-30,0.147000
2025-06-30,0.224000
2016-09-30,0.142000
2016-12-29,0.070000
2019-09-30,0.126000
2022-03-31,0.100000
2025-03-31,0.079000
2025-12-15,3.408000
2018-09-28,0.138000
2022-12-15,0.366000
2021-03-31,0.107000
2014-12-30,0.039000
2015-03-31,0.081000
2019-12-16,0.267000
2022-12-29,0.455000
2024-06-28,0.189000
2024-12-30,0.058000
2013-06-28,0.212000
2018-12-17,0.582000
2022-06-30,0.128000
2026-06-30,0.182000
2017-09-29,0.091000
2017-12-28,0.064000
2020-06-30,0.141000
2020-09-30,0.165000
2023-09-29,0.117000
2013-12-13,0.170000
2017-03-31,0.137000
2021-06-30,0.159000
2022-09-30,0.097000
2023-12-28,0.059000
2014-03-31,0.399000
2015-12-30,0.003000
2018-12-28,0.116000
2024-03-28,0.076000
2013-09-30,0.112000
2014-09-30,0.145000
2024-09-30,0.076000
2025-09-30,0.051000
2025-12-30,0.189000
2016-06-30,0.173000
2017-12-15,3.250000
2020-12-30,0.071000
2021-12-15,1.936000
2023-12-15,0.006000