Postgres OAuth session adapter crashes in rowToSessionData

Postgres adapter for @slices/session crashes in at least two distinct ways:

 SyntaxError: "[object Object]" is not valid JSON
    at JSON.parse (<anonymous>)
    at g.rowToSessionData (.next/server/chunks/585.js:96:830)
    at g.get (.next/server/chunks/585.js:79:246)
    at async e.getSession (.next/server/chunks/585.js:1:8883)

 TypeError: a.created_at.getTime is not a function
    at g.rowToSessionData (.next/server/chunks/585.js:96:856)
    at g.get (.next/server/chunks/585.js:79:246)
    at async e.getSession (.next/server/chunks/585.js:1:8883)

The problems are:

• We have BIGINT for times, so we should've used number. There's no need for getTime.
• We have JSONB for data, so we should've treated it as a Record. There's no need for JSON.parse.