feat: some data management APIs (#176)

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

@@ -1,29 +0,0 @@
-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
-}