spring-data-relational
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Revise JDBC repositories to use `JdbcAggregateTemplate` for queries
JDBC repositories exclusively use individual low-level components such as JdbcTemplate, JdbcConverter and such to run repository queries (except for SimpleJdbcRepository). This story ticket aggregates multiple tasks to revise that support to use the Template directly.
Pre-requisites:
- [x] #687
- [x] #646
- [ ] #743
Follow-up:
- [ ] #373
- [ ] #374
Related, using multiple infrastructure components (such as #544, #994) will become much easier.