f/overrides/event-backup/cfa-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
2019-04-16,0.089000
2020-09-09,0.067000
2022-02-10,0.035000
2026-08-07,0.052000
2016-12-13,0.092000
2020-06-10,0.091000
2025-08-06,0.046000
2019-10-15,0.073000
2022-12-16,0.238000
2024-04-11,0.082000
2015-06-16,0.102000
2016-06-14,0.134000
2017-09-07,0.094000
2018-07-17,0.059000
2021-05-10,0.037000
2024-12-12,0.236000
2026-04-09,0.097000
2014-09-16,0.092000
2018-03-07,0.070000
2021-03-11,0.069000
2017-12-22,0.128000
2018-11-14,0.048000
2019-09-10,0.076000
2021-11-08,0.037000
2023-03-10,0.134000
2023-11-08,0.054000
2025-07-10,0.105000
2015-12-28,0.143000
2022-08-09,0.047000
2016-09-07,0.096000
2019-06-13,0.084000
2020-03-11,0.092000
2014-12-16,0.136000
2019-08-14,0.029000
2020-07-08,0.065000
2023-12-18,0.236000
2024-09-11,0.144000
2016-11-15,0.083000
2019-03-07,0.073000
2022-07-11,0.086000
2025-06-09,0.138000
2017-02-14,0.025000
2017-04-18,0.061000
2020-04-07,0.073000
2024-11-07,0.050000
2025-11-07,0.043000
2017-03-07,0.035000
2018-05-16,0.028000
2019-11-13,0.035000
2021-02-10,0.041000
2025-04-10,0.117000
2017-06-13,0.060000
2017-11-15,0.018000
2019-02-13,0.044000
2020-11-12,0.037000
2023-07-10,0.076000
2024-06-12,0.137000
2026-01-08,0.033000
2017-01-17,0.014000
2017-10-17,0.057000
2022-06-10,0.123000
2024-10-08,0.090000
2025-03-10,0.124000
2025-12-11,0.238000
2018-06-13,0.075000
2019-07-17,0.079000
2021-07-09,0.085000
2022-03-11,0.129000
2025-01-08,0.013000
2017-05-16,0.031000
2022-01-12,0.011000
2022-10-11,0.084000
2023-05-10,0.033000
2024-08-08,0.052000
2025-10-09,0.106000
2026-02-09,0.051000
2026-07-09,0.101000
2021-06-10,0.045000
2024-01-11,0.027000
2015-03-17,0.113000
2017-07-18,0.012000
2018-02-14,0.018000
2018-08-15,0.028000
2020-01-08,0.010000
2021-10-08,0.079000
2022-04-11,0.087000
2024-03-11,0.149000
2018-04-17,0.070000
2018-10-17,0.064000
2019-05-15,0.020000
2020-02-12,0.033000
2024-07-10,0.078000
2018-01-17,0.009000
2019-12-18,0.155000
2020-05-13,0.040000
2023-10-11,0.125000
2024-05-09,0.032000
2020-08-12,0.026000
2023-06-09,0.122000
2019-01-16,0.004000
2022-05-10,0.016000
2023-09-06,0.092000
2021-12-16,0.222000
2023-02-10,0.048000
2023-04-11,0.086000
2025-02-07,0.056000
2025-09-08,0.153000
2020-10-07,0.075000
2021-09-09,0.083000
2022-11-08,0.076000
2018-09-07,0.065000
2024-02-09,0.044000
2025-05-08,0.037000
2018-12-19,0.126000
2021-01-12,0.003000
2023-01-12,0.001000
2026-03-10,0.150000
2017-08-15,0.023000
2021-04-09,0.074000
2021-08-09,0.034000
2023-08-08,0.053000
2026-06-09,0.159000
2020-12-16,0.143000
2022-09-09,0.147000
2026-05-08,0.038000