Update DATA_MODEL.md

SchweizerischeBundesbahnen · Oct 22, 2024 · d170955 · d170955
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 ### Technically orientated description
 
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 Thus, the data model, consisting of TrainrunSection and nodes, forms a network of edges and nodes,
 similar to an undirected graph. The TrainrunSections represent the connections between the nodes and
 enable the representation and analysis of complex relationships in the model.