dashboard: share Spanner clients #6703
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Instead of creating a new Spanner client/connection per each DB operation, cache the clients per each appID. In normal operation, there will be just one appID and one client. For tests, we create a different appID per each NewSpannerCtx anyway.
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Instead of creating a new Spanner client/connection per each DB operation, cache the clients per each appID. In normal operation, there will be just one appID and one client. For tests, we create a different appID per each NewSpannerCtx anyway.