[+] Add isGhost to card

src/main/java/icu/samnyan/aqua/net/UserRegistrar.kt

@@ -67,6 +67,7 @@ class UserRegistrar(
             registerTime = LocalDateTime.now()
             accessTime = registerTime
             aquaUser = u
+            isGhost = true
         }
         u.ghostCard = card
 

src/main/java/icu/samnyan/aqua/sega/general/model/Card.kt

@@ -38,6 +38,10 @@ class Card(
     @JoinColumn(name = "net_user_id")
     @JsonIgnore
     var aquaUser: AquaNetUser? = null,
+
+    // Whether the card is a ghost card
+    @Column(name = "is_ghost")
+    var isGhost: Boolean = false,
 ): Serializable {
     companion object {
         @Serial