f/overrides/event-backup/gsst-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
2021-10-01,0.029000
2023-02-01,0.184000
2024-03-01,0.209000
2026-04-01,0.181000
2024-08-01,0.252000
2024-11-01,0.228000
2021-04-01,0.040000
2021-12-28,0.049000
2022-02-01,0.006000
2022-03-01,0.025000
2022-07-01,0.068000
2024-05-01,0.236000
2026-03-02,0.162000
2022-05-03,0.039000
2023-09-01,0.219000
2025-03-03,0.184000
2024-10-01,0.284000
2024-12-02,0.190000
2020-11-02,0.030000
2021-07-01,0.027000
2021-08-02,0.029000
2023-08-01,0.214000
2023-12-27,0.251000
2024-02-01,0.199000
2025-02-03,0.181000
2025-12-31,0.215000
2021-06-01,0.029000
2024-06-03,0.229000
2025-11-03,0.184000
2026-08-03,0.176000
2019-07-01,0.084000
2019-08-01,0.115000
2019-11-01,0.074000
2020-06-01,0.051000
2022-11-01,0.132000
2024-04-01,0.211000
2019-12-27,0.106000
2021-03-01,0.027000
2021-12-01,0.031000
2023-03-01,0.171000
2023-07-03,0.216000
2025-08-01,0.193000
2020-12-01,0.031000
2024-07-01,0.212000
2026-05-01,0.171000
2020-09-01,0.029000
2020-10-01,0.026000
2020-12-29,0.048000
2023-10-02,0.202000
2025-05-01,0.197000
2025-10-01,0.231000
2022-06-01,0.049000
2023-11-01,0.219000
2023-12-01,0.230000
2026-02-02,0.140000
2021-11-01,0.028000
2022-04-01,0.031000
2025-04-01,0.194000
2020-03-02,0.082000
2020-07-01,0.032000
2021-02-01,0.014000
2022-10-03,0.118000
2024-09-03,0.229000
2022-12-01,0.149000
2022-12-27,0.169000
2025-09-02,0.177000
2025-12-01,0.164000
2025-06-02,0.188000
2019-06-07,0.172000
2019-09-03,0.110000
2020-04-01,0.079000
2022-09-01,0.107000
2023-04-03,0.198000
2023-05-01,0.198000
2026-06-01,0.166000
2019-12-02,0.083000
2020-05-01,0.059000
2020-08-03,0.035000
2021-05-03,0.029000
2021-09-01,0.026000
2023-06-01,0.188000
2019-10-01,0.094000
2020-02-03,0.065000
2022-08-01,0.084000
2024-12-31,0.256000
2025-07-01,0.194000
2026-07-01,0.185000