Add extensible DatabaseManager class enabling custom database backends support
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References
Problem
Currently, while users can customize the database URL via
db_urltraitlet, theDatabaseManager.create_sessionandDatabaseManager.create_tablesfunctions inorm.pyare tightly coupled to SQLAlchemy, which essentially means that while users can specify different database URLs they must be SQLAlchemy-compatible which is limiting.Proposed solution / Code changes
Introduce extensible
DatabaseManagerclass that can be configured via traitlets.User-facing changes
None
Backwards-incompatible changes
None