fix: make Json object values possibly undefined

See also denoland/std#2565. Omitting `undefined` makes the `Json` type pretty annoying to use, e.g. when passing values to `jsonb` columns/params.

Author: soedirgo

src/server/templates/typescript.ts

@@ -40,7 +40,7 @@ export const apply = ({
  }, {} as Record<string, PostgresColumn[]>)
 
  let output = `
-export type Json = string | number | boolean | null | { [key: string]: Json } | Json[]
+export type Json = string | number | boolean | null | { [key: string]: Json | undefined } | Json[]
 
 export interface Database {
  ${schemas

test/server/typegen.ts

@@ -11,7 +11,7 @@ test('typegen', async () => {
  | number
  | boolean
  | null
- | { [key: string]: Json }
+ | { [key: string]: Json | undefined }
  | Json[]
 
  export interface Database {