I have been interested in how Lightroom uses the catalog so was poking around a backup of the catalog. I am a database administrator and I found it rather concerning that although the database (catalog) is pretty well designed, there is no referential integrity defined or enforced. This is non-standard practice and could well be the source of corrupt catalogs I have seen many people complain about. I would strongly recommend the developers modify the catalog and adopt best practices if they want to improve the stability of Lightroom and the catalog.
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