[40] Rewrite the persistance layer

[JaRutkowski]

Concept

• Engine (JDBC/JPA/Hibernate/another),
• Architecture (Local/Remote Server),
• Performance tests (manual/JMetter).

High-level process

1. Decompose domain,
2. Write new persistance layer,
3. Rewrite all dependent places in elibrary-core,
4. Perform performance tests,
5. Deploy change.

Architecture&technology

Development

• [5] micro-skeleton #352
• [6] elibrary-library-micro #351
• [7] elibrary-gateway-micro #353
• elibrary-user-data-micro
• elibrary-lend-micro
• elibrary-dictionary-micro
• elibrary-email-micro
• elibrary-settings-micro

[JaRutkowski]

Use Hibernate 6 and upgrade PostgreSQL (including Driver).
In Hibernate 6 jakarta is used instead of the javax.persistaence.