Module source 

Structs

LocalSource

Files under a root directory; key is a relative path (e.g. “prices/AAPL.csv.gz”).

Traits

ObjectSink

Write-side counterpart to ObjectSource. Kept separate so the read path (and OSS consumers) stay write-free; only the panel rebuild needs this.

ObjectSource

Read-only byte store. Ok(None) means the key is absent (fail-soft).