Upgrade to ktorm 3.0.0, remove email field from users

api/src/entities/User.kt

@@ -1,15 +1,14 @@
 package be.vandewalleh.entities
 
+import com.fasterxml.jackson.annotation.JsonProperty
 import me.liuwj.ktorm.entity.*
-import java.time.LocalDateTime
 
 interface User : Entity<User> {
     companion object : Entity.Factory<User>()
 
     val id: Int
     var username: String
-    var email: String
+
+    @get:JsonProperty(access = JsonProperty.Access.WRITE_ONLY)
     var password: String
-    var createdAt: LocalDateTime
-    var lastLogin: LocalDateTime?
 }