I have several domains based on type TEXT to constrain values in specific ways, such as to disallow empty values or only allow valid email addresses. When I reflect tables with columns of such a domain, SQLAlchemy simply considers their types to be TEXT. Is there any way to make the domains known to SQLAlchemy so that it can treat them as distinct types? My goal is to define a new table with nearly identical structure to an existing one, adding some columns in the process. I looked over "Custom Types" in the manual but I wasn't sure where to start. Would I be creating an entirely new type or augmenting an existing one?
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