overrides/corrections/{SYM}.json (git-tracked, with as_of/source/note)
holds remove/replace/add ops on the dividend and capital-gain series.
data.py applies them on top of whatever the data root (or the frozen
snapshot) provides, in both the full build and the incremental refresh
path, and the corrections dir joins the cache manifest so a change
invalidates the cache. A goget re-download of the base CSV can never
clobber a confirmed correction. Format and usage documented in data.py.
230 tickers whose Yahoo chart responses now come back without a timestamp
array (terminated/merged funds): goget overwrites the .json on every pass
while ohlc.Conv skips the write, leaving the old CSVs as the last known
series. Snapshot them into overrides/frozen/ (git-tracked, audited in
reports/stale-funds.md) and make data.py prefer the frozen copies and
ignore any future data-root rewrite/delete for those symbols, so the
final series survives future goget runs. The cache manifest now covers
the overrides dir too; incremental refresh skips data-root files of
frozen symbols.
