Oliver Gugger 0a2ccfc52b multi: use single read transaction for path finding ...

This commit partially reverts bf27d05a.
To avoid creating multiple database transactions during a single path
finding operation, we create an explicit transaction when the cached
graph is instantiated.
We cache the source node to avoid needing to look that up for every path
finding session.
The database transaction will be nil in case of the in-memory graph.

2021-10-22 09:32:49 +02:00

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