Fuchs_DataService

Logs every SQL error both to the worker's structured (so it reaches whatever sink/OTel export is configured) and to (SQL/local-file debug trail). Passing is optional for call sites that don't have one in scope, but every caller that does have one in scope should pass it — otherwise a failing stored procedure only ever shows up in the debug trail, never in the worker's own logs.

Max parallel invoice-file downloads (independent per file).

Holds the application supplied by the host (the Fuchs web app). Fuchs_DataService is a library — it has no configuration of its own; the host owns the connection strings and MFR credentials and injects them via , which Program.cs calls once at startup before any use.