Documentation: Explain the difference between record links and edge relations

[macjuul]

Description

It is not clear what the pros and cons are for both record links and edge relations, and how you make the decision on which to use.

For example, some benefits of record links:

• Easy to use and represented within a document
• Can be placed into an array to easily track ordering
• Can be used to represent non-existing records

Benefits for edge relations:

• Can be accessed bi-directionally
• Automatically cleaned up when either side is removed
• Can store information on the relation

There should be a dedicated page explaining this, possibly under concepts

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