System.InvalidOperationException: A second operation was started
Full error message
System.InvalidOperationException: A second operation was started on this context instance before a previous operation completed
Solutionsource: ef-docs \u2197
DbContext is not thread-safe; a parallel Task used the same instance. 1. Register DbContext as Scoped (the default in ASP.NET Core) — one per request. 2. For background work: inject `IDbContextFactory<TContext>` and `CreateDbContext()` per task. 3. Don't pass DbContext through `Task.Run` or `Parallel.ForEach` unless you create a new scope inside.
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