f/overrides/event-backup/cdl-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
2018-01-17,0.019000
2018-04-17,0.162000
2020-01-08,0.011000
2021-03-11,0.132000
2026-04-09,0.219000
2023-12-18,0.463000
2016-11-15,0.078000
2020-04-07,0.189000
2016-04-19,0.102000
2018-06-13,0.178000
2021-08-09,0.114000
2023-03-10,0.202000
2023-06-09,0.187000
2026-07-09,0.210000
2016-08-16,0.107000
2020-07-08,0.128000
2021-04-09,0.180000
2024-04-11,0.170000
2024-10-08,0.158000
2017-12-22,0.279000
2018-12-19,0.229000
2022-03-11,0.225000
2024-06-12,0.228000
2017-09-07,0.215000
2018-02-14,0.043000
2022-05-10,0.048000
2024-01-11,0.036000
2026-01-08,0.038000
2015-11-17,0.037000
2019-02-13,0.072000
2025-07-10,0.204000
2025-04-10,0.226000
2016-06-14,0.104000
2017-02-14,0.060000
2018-07-17,0.112000
2018-09-07,0.115000
2020-12-16,0.280000
2024-09-11,0.256000
2025-03-10,0.216000
2020-03-11,0.164000
2021-09-09,0.159000
2023-05-10,0.078000
2023-08-08,0.116000
2019-03-07,0.152000
2019-12-18,0.320000
2020-09-09,0.135000
2022-08-09,0.116000
2023-11-08,0.133000
2025-06-09,0.262000
2024-12-12,0.429000
2017-01-17,0.049000
2017-10-17,0.135000
2018-05-16,0.074000
2020-11-12,0.111000
2021-12-16,0.380000
2022-06-10,0.184000
2022-11-08,0.108000
2017-03-07,0.080000
2018-08-15,0.068000
2019-09-10,0.124000
2021-01-12,0.006000
2025-02-07,0.138000
2020-06-10,0.177000
2023-04-11,0.190000
2024-02-09,0.109000
2025-10-09,0.216000
2018-11-14,0.104000
2023-01-12,0.023000
2015-08-18,0.115000
2016-09-07,0.096000
2022-02-10,0.068000
2024-05-09,0.074000
2026-02-09,0.142000
2016-10-18,0.104000
2020-10-07,0.149000
2021-05-10,0.097000
2026-08-07,0.136000
2016-01-19,0.011000
2019-01-16,0.008000
2019-10-15,0.184000
2021-10-08,0.172000
2022-09-09,0.223000
2024-08-08,0.140000
2017-05-16,0.067000
2018-03-07,0.132000
2023-02-10,0.102000
2025-05-08,0.087000
2025-11-07,0.110000
2015-10-20,0.024000
2022-04-11,0.191000
2025-12-11,0.456000
2022-10-11,0.148000
2016-05-17,0.100000
2017-07-18,0.035000
2026-05-08,0.112000
2016-02-16,0.125000
2019-05-15,0.043000
2019-08-14,0.066000
2020-02-12,0.085000
2025-09-08,0.260000
2016-12-13,0.169000
2017-08-15,0.056000
2021-11-08,0.081000
2022-07-11,0.163000
2025-01-08,0.008000
2017-04-18,0.158000
2017-11-15,0.047000
2019-11-13,0.076000
2021-02-10,0.098000
2026-06-09,0.295000
2020-05-13,0.084000
2021-06-10,0.020000
2025-08-06,0.110000
2016-07-19,0.026000
2019-07-17,0.164000
2024-11-07,0.125000
2018-10-17,0.138000
2019-06-13,0.160000
2020-08-12,0.050000
2015-12-28,0.142000
2017-06-13,0.119000
2021-07-09,0.151000
2023-07-10,0.183000
2023-10-11,0.262000
2024-07-10,0.146000
2019-04-16,0.171000
2022-01-12,0.025000
2024-03-11,0.268000
2022-12-16,0.450000
2023-09-06,0.168000
2026-03-10,0.256000