Hi, I am a newbie to SQLAlchemy. While reading the docs on the sqlalchemy site, I was a bit confused about ORM and Core. >From what I understand, we can define table and class mapping either through ORM (defining a class that extends Base and so on) or we can directly use Core components (Define Table's using SQL expression and then define explicit mappings to python classes). In my project, I need to define mappings for tables with composite primary/foreign keys. I was wondering which of the two approaches will be better (easier?). Given that size of DB is huge (a few mega bytes per day), which approach has a performance incentive? Also which of the two approaches would be easier to integrate with web development frameworks (Grok, Pyramid etc)?
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