f/overrides/event-backup/memux-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
2019-10-31,0.017763
2021-12-31,0.015262
2023-04-28,0.018913
2019-09-30,0.017837
2019-12-31,0.018001
2020-01-31,0.017285
2022-01-31,0.015023
2022-12-30,0.016373
2025-02-28,0.021980
2025-06-30,0.023857
2020-07-31,0.015281
2023-08-31,0.019136
2023-12-29,0.022804
2024-02-29,0.019967
2024-04-30,0.022326
2024-11-29,0.023630
2023-02-28,0.015547
2023-07-31,0.019778
2022-10-31,0.015664
2019-02-28,0.019700
2020-04-30,0.017447
2020-05-29,0.018062
2020-08-31,0.014820
2021-03-31,0.016659
2022-04-29,0.015554
2022-08-31,0.015236
2023-09-29,0.019233
2023-11-30,0.020161
2024-08-30,0.022846
2025-07-31,0.024213
2025-08-29,0.022594
2026-01-30,0.024815
2021-04-30,0.015752
2022-06-30,0.016126
2024-06-28,0.021559
2021-05-28,0.016145
2021-11-30,0.014624
2022-02-28,0.013835
2024-03-28,0.022824
2024-07-31,0.022642
2019-05-31,0.022800
2019-11-29,0.017083
2020-06-30,0.017240
2024-05-31,0.022492
2026-06-30,0.003904
2019-03-29,0.022328
2022-03-31,0.015580
2025-04-30,0.023946
2019-07-31,0.020512
2020-12-31,0.016873
2022-07-29,0.015977
2022-09-30,0.014979
2023-06-30,0.019074
2025-09-30,0.022247
2019-04-30,0.021708
2020-09-30,0.014989
2024-09-30,0.022363
2025-05-30,0.024029
2025-10-31,0.023674
2026-03-31,0.024680
2021-09-30,0.014732
2025-03-31,0.024453
2019-01-31,0.021810
2019-06-28,0.021381
2020-11-30,0.016323
2021-01-29,0.016722
2021-08-31,0.014800
2022-11-30,0.015644
2023-10-31,0.019383
2025-12-31,0.024445
2019-08-30,0.020340
2020-02-28,0.016362
2020-03-31,0.017811
2021-06-30,0.014203
2023-01-31,0.016883
2024-10-31,0.023295
2025-01-31,0.024928
2026-04-30,0.023531
2026-05-29,0.021109
2020-10-30,0.016349
2021-10-29,0.014913
2024-12-31,0.024422
2026-02-27,0.022519
2021-02-26,0.014940
2021-07-30,0.014586
2022-05-31,0.016459
2023-03-31,0.017551
2023-05-31,0.019875
2024-01-31,0.022090
2025-11-28,0.023158