f/overrides/event-backup/aoa-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
2011-06-27,0.250000
2017-07-06,0.397000
2009-03-26,0.110000
2010-09-27,0.086000
2013-07-02,0.327000
2016-07-06,0.403000
2024-04-02,0.205000
2009-06-25,0.208000
2016-12-28,0.363000
2019-04-02,0.179000
2023-10-03,0.225000
2014-12-26,0.306000
2017-04-04,0.127000
2017-12-28,2.062000
2015-12-28,0.287000
2025-07-02,0.621000
2009-09-24,0.101000
2011-12-27,0.235000
2015-07-02,0.419000
2019-12-24,0.542000
2020-07-02,0.357000
2015-10-02,0.132000
2016-10-04,0.139000
2018-12-28,0.350000
2012-12-26,0.277000
2018-10-02,0.168000
2019-10-02,0.181000
2024-07-02,0.547000
2025-10-02,0.254000
2008-12-26,0.172000
2012-03-27,0.103000
2012-06-26,0.286000
2014-10-02,0.147000
2018-07-03,0.483000
2020-10-02,0.159000
2021-04-05,0.114000
2022-07-05,0.514000
2011-09-27,0.139000
2013-10-02,0.138000
2013-12-27,0.229000
2023-04-04,0.184000
2026-04-02,0.276000
2022-12-23,0.379000
2024-10-02,0.267000
2010-06-25,0.205000
2014-07-02,0.418000
2021-12-23,0.566000
2023-12-22,0.627000
2025-04-02,0.218000
2026-07-02,0.676000
2011-03-28,0.105000
2015-04-02,0.125000
2021-10-04,0.153000
2010-03-26,0.066000
2025-12-23,0.856000
2009-12-28,0.193000
2012-09-26,0.143000
2017-10-03,0.157000
2021-07-02,0.383000
2010-12-27,0.203000
2013-04-02,0.128000
2020-12-24,0.421000
2022-10-04,0.196000
2024-12-20,0.741000
2018-04-03,0.149000
2019-07-02,0.548000
2020-04-02,0.162000
2014-04-02,0.137000
2022-04-04,0.168000
2023-07-05,0.499000