[+] Data support APIs (#151)

src/main/java/icu/samnyan/aqua/net/db/AquaNetUser.kt

@@ -98,6 +98,7 @@ interface AquaNetUserRepo : JpaRepository<AquaNetUser, Long> {
     fun findByEmailIgnoreCase(email: String): AquaNetUser?
     fun findByUsernameIgnoreCase(username: String): AquaNetUser?
     fun findByKeychip(keychip: String): AquaNetUser?
+    fun findByGhostCardExtId(extId: Long): AquaNetUser?
 }
 
 data class SettingField(

src/main/java/icu/samnyan/aqua/net/db/AquaNetUserFedy.kt

@@ -0,0 +1,29 @@
+package icu.samnyan.aqua.net.db
+
+import jakarta.persistence.*
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.stereotype.Repository
+import java.io.Serializable
+import java.time.Instant
+
+@Entity
+@Table(name = "aqua_net_user_fedy")
+class AquaNetUserFedy(
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    var id: Long = 0,
+
+    @Column(nullable = false)
+    var createdAt: Instant = Instant.now(),
+
+    // Linking to the AquaNetUser
+    @OneToOne
+    @JoinColumn(name = "auId", referencedColumnName = "auId")
+    var aquaNetUser: AquaNetUser,
+) : Serializable
+
+@Repository
+interface AquaNetUserFedyRepo : JpaRepository<AquaNetUserFedy, Long> {
+    fun findByAquaNetUserAuId(auId: Long): AquaNetUserFedy?
+    fun deleteByAquaNetUserAuId(auId: Long): Unit
+}