@NotNull should also apply to DDL

[jo-elimu]

The JPA schema export at https://github.com/elimu-ai/webapp/blob/main/src/main/resources/META-INF/jpa-schema-export.sql should apply not null when an entity's property is annotated with @NotNull.

https://stackoverflow.com/questions/51258073/notnull-annotation-does-not-translate-to-not-null-constraint-in-schema-generati

Make changes so that @NotNull automatically adds not null to the database layer (DDL + production database).

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Relates to #1286, #1607

[venkatesh2k3]

@jo-elimu So, do we need to add null constraints to the model classes according to this file https://github.com/elimu-ai/webapp/blob/main/src/main/resources/META-INF/jpa-schema-export.sql

[jo-elimu]

@jo-elimu So, do we need to add null constraints to the model classes according to this file https://github.com/elimu-ai/webapp/blob/main/src/main/resources/META-INF/jpa-schema-export.sql

@venkatesh2k3 No, because we want not null to be applied implicitly to the DDL whenever a property is annotated with @NotNull, which they are in many classes already.

I don't know when and why this stopped working, but I suspect it has to do with the dependency versions we use. We also made the switch from MySQL to MariaDB a few years ago, so maybe we should replace the usage of MySQL in our DB configuration as well.

We are currently running MariaDB 11.4.2 in production: https://github.com/elimu-ai/webapp/blob/main/src/main/config/DEPLOY.md

[jo-elimu]

Possibly related: https://stackoverflow.com/a/51734560