f/overrides/event-backup/amt-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
2013-12-12,0.290000
2017-09-28,0.660000
2026-06-12,1.790000
2023-06-15,1.570000
2019-09-26,0.950000
2021-09-27,1.310000
2012-12-13,0.240000
2016-12-23,0.580000
2022-12-27,1.560000
2014-09-19,0.360000
2014-12-12,0.380000
2017-06-15,0.640000
2020-06-18,1.100000
2023-12-27,1.700000
2024-04-11,1.620000
2012-06-28,0.220000
2015-06-15,0.440000
2022-10-07,1.470000
2013-06-13,0.270000
2015-12-14,0.490000
2019-04-10,0.900000
2025-06-13,1.700000
2012-09-27,0.230000
2021-04-12,1.240000
2021-06-17,1.270000
2013-09-19,0.280000
2016-04-08,0.510000
2022-04-12,1.400000
2023-04-13,1.560000
2014-04-08,0.320000
2017-12-27,0.700000
2020-09-25,1.140000
2025-09-30,1.700000
2015-09-21,0.460000
2017-04-10,0.620000
2018-09-27,0.790000
2014-06-13,0.340000
2018-12-26,0.840000
2019-06-18,0.920000
2023-10-10,1.620000
2024-06-14,1.620000
2024-10-09,1.620000
2024-12-27,1.620000
2015-04-08,0.420000
2016-09-28,0.550000
2018-06-18,0.770000
2019-12-26,1.010000
2022-06-16,1.430000
2026-04-14,1.790000
2012-04-09,0.210000
2013-04-08,0.260000
2018-04-10,0.750000
2020-12-24,1.210000
2021-12-23,1.390000
2016-06-15,0.530000
2020-04-13,1.080000
2011-12-08,0.350000
2025-04-11,1.700000
2025-12-29,1.700000