f/overrides/event-backup/amza-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
2018-10-22,1.100000
2024-04-22,0.260000
2025-12-22,0.290000
2015-10-06,5.150000
2018-06-20,1.100000
2020-03-20,0.300000
2024-10-21,0.260000
2026-07-20,0.340000
2019-11-20,0.800000
2021-05-20,0.220000
2025-06-20,0.290000
2016-04-05,5.200000
2017-04-04,5.200000
2020-01-03,0.800000
2020-05-20,0.230000
2023-01-03,0.220000
2025-10-20,0.290000
2017-01-04,5.200000
2018-12-20,1.100000
2023-04-20,0.240000
2016-10-04,5.200000
2018-09-20,1.100000
2019-02-20,0.800000
2020-08-20,0.240000
2018-05-22,1.100000
2019-06-20,0.800000
2022-04-20,0.220000
2024-06-20,0.260000
2026-04-20,0.340000
2016-07-05,5.200000
2019-10-21,0.800000
2020-02-20,0.600000
2024-09-20,0.260000
2025-02-20,0.290000
2017-07-05,5.200000
2021-04-20,0.220000
2025-07-21,0.290000
2020-09-21,0.240000
2021-02-22,0.220000
2022-01-20,0.220000
2021-03-22,0.220000
2025-11-20,0.290000
2019-08-20,0.800000
2020-06-22,0.240000
2023-06-20,0.240000
2021-06-21,0.220000
2021-08-20,0.220000
2023-10-20,0.240000
2026-08-20,0.340000
2015-01-06,5.000000
2019-05-20,0.800000
2019-09-20,0.800000
2021-07-20,0.220000
2024-08-20,0.260000
2025-03-20,0.290000
2026-03-20,0.340000
2015-07-07,5.100000
2020-01-21,0.600000
2022-08-22,0.220000
2023-12-20,0.240000
2018-11-20,1.100000
2024-07-22,0.260000
2022-09-20,0.220000
2023-03-20,0.240000
2023-05-22,0.240000
2025-01-21,0.290000
2018-07-20,1.100000
2018-01-04,5.200000
2020-11-20,0.220000
2021-01-20,0.220000
2022-05-20,0.220000
2015-04-07,5.050000
2024-05-20,0.260000
2021-01-04,0.220000
2025-09-22,0.290000
2018-04-20,1.100000
2021-10-20,0.220000
2021-11-22,0.220000
2025-08-20,0.290000
2023-09-20,0.240000
2024-01-22,0.260000
2024-03-20,0.260000
2024-11-20,0.260000
2019-01-22,0.800000
2019-03-20,0.800000
2020-07-20,0.240000
2023-08-21,0.240000
2025-04-21,0.290000
2026-05-20,0.340000
2016-01-05,5.200000
2019-04-22,0.800000
2019-07-22,0.800000
2022-01-03,0.220000
2022-02-22,0.220000
2022-06-21,0.220000
2022-10-20,0.220000
2023-01-20,0.240000
2023-07-20,0.240000
2026-06-22,0.340000
2018-03-20,1.100000
2018-02-21,1.100000
2023-02-21,0.240000
2025-05-20,0.290000
2026-01-20,0.340000
2023-11-20,0.240000
2021-09-20,0.220000
2023-01-10,0.220000
2024-12-20,0.260000
2026-02-20,0.340000
2024-02-21,0.260000
2017-10-03,5.200000
2018-08-21,1.100000
2020-04-20,0.250000
2020-10-20,0.240000
2022-03-21,0.220000
2022-07-20,0.220000