refactor service layer

lib/services/service.types.ts

@@ -0,0 +1,5 @@
+import { User, Membership, Account } from '@prisma/client';
+export type MembershipWithAccount = (Membership & {account: Account});
+export type FullDBUser = (User & { memberships: MembershipWithAccount[]; });
+export type MembershipWithUser = (Membership & { user: User});
+export type AccountWithMembers = (Account & {members: MembershipWithUser[]});