QueryDSL will be replaced with Lombok's `FieldNameConstants` here. Why?
1. QueryDSL with JPA on relational databases doesn't lend itself very
well to nested data structures. But with MongoDB, it works quite well.
So we've come to rely on it quite a bit. Since we intend to move towards
a more flat, relation-ed and normalized DB design once we get to
Postgres, dealing with nested data structures should be seen as
temporary.
2. We only use QueryDSL for field name constants, and absolutely nothing
else. QueryDSL is a far more capable and powerful system, and is
overkill for this purpose. Lombok's annotation is exactly tuned for this
purpose and is more concise and easy-to-use.
3. QueryDSL query generation current doesn't work in IntelliJ, but
Lombok's does. So this will free us up from having to run a Maven build
when sometimes switching branches.
**PS**: This PR doesn't remove QueryDSL entirely. Only a part of it.
That'd become a much bigger PR and I'm already uncomfortable with the
size of this PR. Once this is merged, I'll open further PRs until we
completely remove QueryDSL.
**PPS**: QueryDSL is a powerful querying mechanism that we don't use
today. Perhaps once we're comfortable with Postgres in the future, we
will very likely revisit.
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