f/overrides/event-backup/ftsl-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
2015-11-20,0.160000
2019-08-21,0.184000
2020-10-21,0.127000
2021-08-24,0.130000
2024-03-21,0.300000
2025-03-27,0.260000
2015-10-21,0.160000
2018-04-20,0.153000
2022-02-18,0.143000
2014-10-21,0.145000
2015-05-21,0.150000
2017-11-21,0.145000
2018-11-21,0.170000
2020-12-24,0.145000
2022-01-21,0.148000
2022-03-25,0.143000
2023-07-21,0.290000
2023-11-21,0.295000
2026-07-21,0.225000
2026-08-21,0.225000
2015-12-23,0.160000
2016-06-22,0.150000
2022-08-23,0.165000
2024-04-23,0.295000
2026-02-20,0.240000
2013-07-23,0.173000
2014-02-21,0.145000
2017-10-20,0.140000
2019-03-21,0.193000
2021-05-21,0.120000
2023-09-22,0.300000
2025-05-21,0.258000
2026-04-21,0.235000
2016-10-21,0.150000
2017-01-20,0.140000
2017-06-22,0.140000
2023-03-24,0.285000
2026-05-21,0.235000
2015-01-21,0.150000
2016-03-23,0.150000
2016-11-22,0.150000
2019-04-23,0.185000
2020-03-26,0.154000
2021-04-21,0.109000
2018-01-23,0.145000
2019-05-21,0.180000
2020-07-21,0.130000
2022-05-24,0.143000
2023-10-24,0.295000
2024-02-21,0.300000
2025-09-25,0.245000
2017-03-23,0.140000
2019-06-14,0.175000
2021-06-24,0.140000
2022-04-21,0.143000
2025-06-26,0.253000
2014-07-22,0.145000
2017-08-22,0.140000
2018-02-21,0.145000
2018-07-20,0.170000
2025-11-21,0.240000
2016-01-21,0.150000
2016-04-21,0.150000
2017-04-21,0.140000
2019-11-21,0.165000
2020-11-24,0.131000
2024-01-23,0.308000
2025-12-12,0.240000
2013-11-21,0.155000
2019-02-21,0.183000
2019-10-22,0.170000
2020-06-25,0.135000
2023-02-22,0.285000
2023-08-22,0.305000
2025-07-22,0.253000
2015-02-20,0.150000
2025-02-21,0.263000
2019-09-25,0.175000
2021-11-23,0.122000
2014-03-25,0.145000
2025-04-22,0.258000
2014-04-22,0.145000
2014-05-21,0.145000
2015-08-21,0.155000
2020-05-21,0.145000
2020-09-24,0.115000
2013-05-21,0.173000
2014-01-22,0.155000
2016-07-21,0.150000
2020-08-21,0.120000
2021-12-23,0.148000
2020-02-21,0.154000
2023-04-21,0.285000
2017-07-21,0.140000
2019-07-23,0.183000
2014-12-23,0.206000
2018-03-22,0.145000
2018-05-22,0.160000
2018-12-18,0.185000
2021-10-21,0.125000
2022-09-23,0.210000
2014-08-21,0.145000
2017-09-21,0.140000
2020-04-21,0.150000
2023-05-23,0.285000
2024-09-26,0.290000
2024-10-22,0.290000
2026-06-25,0.230000
2014-11-21,0.150000
2016-08-23,0.150000
2017-12-21,0.205000
2023-06-27,0.285000
2016-09-21,0.150000
2016-12-21,0.145000
2017-02-22,0.140000
2021-01-21,0.136000
2024-11-21,0.280000
2025-01-22,0.268000
2014-06-24,0.145000
2014-09-23,0.145000
2015-06-24,0.150000
2015-07-21,0.155000
2019-01-23,0.183000
2022-07-21,0.155000
2022-11-22,0.228000
2024-05-21,0.293000
2013-10-22,0.155000
2016-05-20,0.150000
2018-08-21,0.170000
2021-02-23,0.110000
2013-08-21,0.165000
2013-09-20,0.160000
2013-12-18,0.155000
2015-09-23,0.160000
2017-05-23,0.140000
2018-10-23,0.170000
2020-01-22,0.150000
2021-09-23,0.128000
2022-10-21,0.228000
2022-12-23,0.270000
2026-03-26,0.235000
2018-06-21,0.170000
2024-08-21,0.290000
2022-06-24,0.153000
2024-07-23,0.288000
2024-12-13,0.275000
2025-08-21,0.245000
2016-02-23,0.150000
2021-07-21,0.135000
2023-01-24,0.285000
2013-06-21,0.173000
2015-03-25,0.150000
2018-09-14,0.170000
2019-12-13,0.155000
2021-03-25,0.119000
2023-12-22,0.303000
2024-06-27,0.288000
2025-10-21,0.245000
2026-01-21,0.240000