I moved a production multi-tenant SaaS off Lovable and Supabase Cloud onto a single server I own. Ninety-nine tables, 228 row-level-security policies, and a front end that queries the database directly from the browser. It took about a week. Most of that week went into four or five specific problems, each of which produced a working deployment that was quietly wrong. This is what they were. Supabase is five programs, not one Internalise this before planning anything. What the ...