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Design Help for new project

We are working on project that does the following.

Step 1
Read data from the database (from a schema of tables). We came up with a domain based on good DDD principles and hydrating the object graph by hibernate mappings
           Summary Table
           Detailed Table
           More Details Table

We have Summary.java, Detailed.java and MoreDetails.java.

When we run the hibernate queries, we get list of Summary.java objects (they inturn contain Detailed and MoreDetails objects)

Step 2:
Enrich this model (Object Graph) with data from the other databases and web services.

Need some help in implementing Step 2 with good design, like using some services, infrastructure services, good practices.

let me know if the above is not clear, especially the enrichment piece.

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8/22/2022 - Mon
Am P

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