f/overrides/event-backup/ewco-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
2020-06-22,0.069390
2022-09-19,0.098010
2022-03-21,0.092440
2022-06-21,0.100270
2023-06-20,0.032840
2025-12-22,0.129170
2025-06-23,0.085130
2019-12-23,0.196520
2020-09-21,0.096840
2021-09-20,0.094460
2024-03-18,0.081880
2024-06-24,0.080680
2024-09-23,0.092190
2025-03-24,0.101040
2021-06-21,0.085200
2026-06-22,0.089500
2020-12-21,0.092480
2021-12-20,0.118300
2019-06-24,0.076300
2020-03-23,0.073090
2022-12-19,0.072890
2023-12-18,0.089650
2025-09-22,0.344660
2026-03-23,0.086950
2018-12-24,0.053360
2019-03-18,0.051180
2019-09-23,0.078740
2021-03-22,0.096190
2023-03-20,0.057000
2023-09-18,0.108790
2024-12-23,0.097920