Or at least I find it tricky. :-)
Assume we have three tables A, B and C. Table A contains a path and the distance for traveling that path:
A (PathId, NodeId, Dist (from previous node))
1, 1, 0
1, 2, 10
1, 3, 5
Table B contains observed data on path level:
B (ObsId, PathId)
1, 1
2, 1
Table...
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