Deduplicate graph path nodes before saving

Ryan Wellsrequested to merge
547640-deduplicate-graph-nodes-before-save into master

What does this MR do and why?

Deduplicate graph path nodes before saving

We will currently save multiple instances of the same graph path node to the database. This is wasteful and takes up ingestion time. Deduplicate these paths to ensure we're saving much less data to the db.

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Related to #547640 (closed)

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