Use uuid.UUID everywhere and have postgres generate ids

token.go

@@ -1,13 +1,16 @@
 package budgeteer
 
-import "git.javil.eu/jacob1123/budgeteer/postgres"
+import (
+	"git.javil.eu/jacob1123/budgeteer/postgres"
+	"github.com/google/uuid"
+)
 
 // Token contains data that authenticates a user
 type Token interface {
 	GetUsername() string
 	GetName() string
 	GetExpiry() float64
-	GetID() string
+	GetID() uuid.UUID
 }
 
 // TokenVerifier verifies a Token