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abdde307c6
Add a strict set of updates to prevent incorrect state changes and correct usage. Supporting the transaction at the trait level prevented some cases, but having a strict set of state change flows is better. This bug was found while developing the signatory. The keys are read from memory, triggering race conditions at the database, and some `Pending` states are selected (instead of just selecting `Unspent`). This PR also introduces a set of generic database tests to be executed for all database implementations, this test suite will make sure writing and maintaining new database drivers