The definition of the type-generic used on the sql() function is:

sql<T extends Record<string, unknown> = Record<string, any>>

The Record<string, unknown> is an alias for the { [key: string]: unknown } type signature. The problem is that interface definitions don't include this type signature, so they cannot be passed into this type-generic.

Here's a standalone example:

interface MyInterface {
  name: string
}

const myFunc = <T extends Record<string, unknown> = Record<string, any>>(
  param: T,
) => undefined

const myInterface: MyInterface = {
  name: 'Name',
}

myFunc<MyInterface>(myInterface)

This will produce a type-check error:

Type 'MyInterface' does not satisfy the constraint 'Record<string, unknown>'.
Index signature for type 'string' is missing in type 'MyInterface'. [2344]