f/overrides/event-backup/hdv-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
2013-06-26,0.110800
2016-03-23,0.135400
2017-03-24,0.144600
2024-12-17,0.224400
2019-12-16,0.155800
2026-03-17,0.168600
2018-12-17,0.141800
2019-09-24,0.171400
2020-09-23,0.170200
2025-09-16,0.190000
2011-09-26,0.058000
2012-03-26,0.105200
2013-09-24,0.111400
2015-06-24,0.145000
2017-12-19,0.155200
2018-06-26,0.159200
2021-12-13,0.210200
2014-03-25,0.113200
2015-12-24,0.143200
2022-03-24,0.154000
2025-03-18,0.159000
2025-12-16,0.250600
2026-07-15,0.087000
2011-06-23,0.048800
2016-09-26,0.137600
2014-12-24,0.133000
2021-03-25,0.176400
2012-06-19,0.108000
2023-03-23,0.208400
2026-06-15,0.185000
2014-06-24,0.118600
2026-08-19,0.105000
2023-09-26,0.215600
2024-03-21,0.167000
2015-09-25,0.144400
2016-06-21,0.135800
2017-09-26,0.146400
2020-03-25,0.182800
2022-09-26,0.246200
2023-12-20,0.195400
2013-12-23,0.115800
2020-06-15,0.175800
2022-12-13,0.229000
2024-09-25,0.245800
2013-03-25,0.108000
2021-06-10,0.162000
2025-06-16,0.182600
2012-09-25,0.103200
2018-03-22,0.159800
2019-03-20,0.164400
2019-06-17,0.150000
2022-06-09,0.114000
2011-12-28,0.002200
2016-12-21,0.131200
2017-06-27,0.143600
2020-12-14,0.184600
2021-09-24,0.152800
2023-06-07,0.159200
2011-12-22,0.073800
2012-12-19,0.102200
2014-09-24,0.125200
2015-03-25,0.143400
2018-09-26,0.158200
2024-06-11,0.185600