Pinning/add use secondary db context manager #1
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This commit adds support for nested use of the UsePrimaryDB context manager. If a new instance of the context manager was created at each level we could use instance variables to store the pinning state but the default instance is generally used directly. Instead, we store a stack of pinning values locally in the thread and pop each value as we unwind the stack.
This commit adds a UseSecondaryDB context manager which unpins within a block.
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