f/overrides/event-backup/gto-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
2021-12-20,0.107000
2022-05-23,0.130000
2022-08-22,0.147000
2023-02-21,0.151000
2025-02-24,0.173000
2025-06-23,0.167000
2025-10-20,0.193000
2018-09-24,0.175000
2020-02-24,0.109000
2022-03-21,0.108000
2023-09-18,0.154000
2018-10-22,0.143000
2018-07-03,0.144000
2019-03-18,0.122000
2021-11-22,0.097000
2016-05-02,0.109000
2023-08-21,0.169000
2023-11-20,0.167000
2024-07-22,0.172000
2025-01-21,0.172000
2025-04-21,0.180000
2020-06-22,0.131000
2021-02-22,0.071000
2022-10-24,0.161000
2023-04-24,0.146000
2025-08-18,0.204000
2025-09-22,0.211000
2025-11-24,0.194000
2026-04-20,0.170000
2020-03-23,0.108000
2020-11-23,0.079000
2021-10-18,0.095000
2022-01-24,0.100000
2023-01-23,0.164000
2024-04-22,0.177000
2018-06-04,0.127000
2022-11-21,0.152000
2022-06-21,0.130000
2022-12-19,0.190000
2026-05-18,0.178000
2019-02-19,0.119000
2022-02-22,0.094000
2024-06-24,0.178000
2018-12-24,0.251000
2018-05-02,0.114000
2018-11-19,0.154000
2020-10-19,0.073000
2026-07-20,0.190000
2017-05-01,0.109000
2017-08-01,0.064000
2017-11-02,0.086000
2019-05-20,0.111000
2021-05-24,0.090000
2022-07-18,0.150000
2023-05-22,0.150000
2017-07-03,0.119000
2017-06-01,0.107000
2017-10-03,0.115000
2023-12-18,0.166000
2017-03-01,0.113000
2017-04-03,0.144000
2018-02-02,0.118000
2023-03-20,0.161000
2016-09-01,0.128000
2020-01-21,0.109000
2021-06-21,0.089000
2023-10-23,0.169000
2026-02-23,0.180000
2018-08-20,0.072000
2024-03-18,0.180000
2025-07-21,0.179000
2018-08-02,0.145000
2017-02-01,0.162000
2019-01-22,0.151000
2024-08-19,0.151000
2016-12-28,0.444000
2024-05-20,0.182000
2025-03-24,0.188000
2016-06-01,0.119000
2019-12-23,0.374000
2020-05-18,0.128000
2024-11-18,0.159000
2017-09-01,0.058000
2022-04-18,0.115000
2018-04-03,0.134000
2019-08-19,0.104000
2019-11-18,0.090000
2023-07-24,0.168000
2024-10-21,0.167000
2016-12-01,0.116000
2021-04-19,0.087000
2019-04-22,0.114000
2021-08-23,0.100000
2024-09-23,0.173000
2025-05-19,0.177000
2025-12-22,0.191000
2026-06-22,0.187000
2018-03-02,0.092000
2019-07-22,0.118000
2016-07-01,0.117000
2020-08-24,0.105000
2024-02-20,0.171000
2026-01-20,0.184000
2019-09-23,0.112000
2019-06-24,0.110000
2020-07-20,0.126000
2021-03-22,0.081000
2017-12-28,0.318000
2026-03-23,0.181000
2023-06-20,0.150000
2016-11-01,0.069000
2016-10-03,0.116000
2022-09-19,0.137000
2021-07-19,0.096000
2019-10-21,0.087000
2024-12-23,0.174000
2018-12-26,0.956000
2020-12-21,1.164000
2024-01-22,0.168000
2017-12-04,0.091000
2021-01-19,0.075000
2020-04-20,0.119000