f/overrides/event-backup/ewmc-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
2011-09-16,0.055272
2016-06-17,0.084429
2021-12-20,0.195780
2011-03-18,0.054556
2014-06-20,0.166067
2019-06-24,0.234130
2014-03-21,0.147893
2018-06-15,0.197330
2016-03-18,0.222940
2018-03-16,0.190400
2022-06-21,0.273080
2022-09-19,0.318870
2023-09-18,0.150770
2025-03-24,0.406360
2014-09-19,0.150102
2014-12-19,0.185000
2017-06-16,0.145100
2017-09-15,0.173200
2021-09-20,0.251090
2010-12-17,0.032095
2013-03-15,0.087500
2024-12-23,0.209370
2024-06-24,0.295940
2015-06-19,0.163827
2019-03-18,0.204200
2021-06-21,0.194970
2012-06-15,0.130861
2012-09-21,0.137671
2015-12-18,0.155625
2020-06-22,0.162970
2022-12-19,0.209730
2024-09-23,0.292560
2013-09-20,0.124356
2018-09-24,0.255530
2019-09-23,0.216900
2020-12-21,0.193650
2021-03-22,0.237480
2013-06-21,0.135862
2013-12-20,0.489678
2022-03-21,0.267380
2023-12-18,0.187140
2023-06-20,0.306890
2025-06-23,0.488330
2015-03-20,0.196332
2016-09-16,0.185954
2019-12-23,0.189320
2020-09-21,0.190490
2024-03-18,0.276050
2026-06-22,0.204000
2011-06-17,0.069913
2012-03-16,0.070352
2012-12-21,0.216451
2017-12-15,0.228200
2020-03-23,0.344280
2023-03-20,0.296070
2016-12-16,0.084311
2017-03-17,0.187300
2018-12-24,0.189700
2025-12-22,0.216820
2026-03-23,0.212460
2011-12-16,0.119836
2015-09-18,0.165634
2025-09-22,0.315210