diff --git a/AquaNet/src/components/settings/UserSettings.svelte b/AquaNet/src/components/settings/UserSettings.svelte
index 29faee9f..1220b304 100644
--- a/AquaNet/src/components/settings/UserSettings.svelte
+++ b/AquaNet/src/components/settings/UserSettings.svelte
@@ -1,10 +1,10 @@
 <script lang="ts">
   import { slide, fade } from "svelte/transition";
-  import type { AquaNetUser } from "../../libs/generalTypes";
-  import { CARD, USER } from "../../libs/sdk";
+  import type { AquaNetUser, ConfirmProps } from "../../libs/generalTypes";
+  import { CARD, GAME, USER, type ExportGameName } from "../../libs/sdk";
   import StatusOverlays from "../../components/StatusOverlays.svelte";
   import Icon from "@iconify/svelte";
-  import { pfp } from "../../libs/ui";
+  import { download, pfp } from "../../libs/ui";
   import { t, ts } from "../../libs/i18n";
   import Cropper from "svelte-easy-crop";
 
@@ -12,6 +12,7 @@
   let error: string;
   let submitting = ""
   let loading = false;
+  let confirm: ConfirmProps | null = null;
 
   const profileFields = [
     [ 'displayName', t('settings.profile.name') ],
@@ -97,11 +98,48 @@
     location.href = "/";
   }
 
+  function requestAccountDeletion() {
+    if (submitting) return;
+    confirm = {
+      title: t('settings.profile.delete-confirm-title'),
+      message: t('settings.profile.delete-confirm-message'),
+      dangerous: true,
+      cancel: () => confirm = null,
+      confirm: deleteAccount,
+    };
+  }
+
+  async function deleteAccount() {
+    if (submitting) return;
+    submitting = "deleteAccount";
+
+    try {
+      const gameSummary = await CARD.userGames(me.username);
+      const games = (['mai2', 'chu3', 'ongeki', 'wacca', 'diva'] as ExportGameName[])
+        .filter(game => gameSummary[game] !== null);
+      const exports = await Promise.all(games.map(async game => ({
+        game,
+        data: await GAME.export(game),
+      })));
+
+      exports.forEach(({game, data}) => download(
+        JSON.stringify(data, null, 2),
+        `AquaDX_${game}_export_${me.username}.json`,
+      ));
+      await USER.deleteAccount();
+      localStorage.removeItem("token");
+      location.href = "/";
+    } catch (e) {
+      error = (e as Error).message;
+      submitting = "";
+    }
+  }
+
   const passwordAction = (node: HTMLInputElement, whether: boolean) => {
     if (whether) node.type = 'password'
   }
 </script>
-<StatusOverlays {error} loading={!!submitting || loading} />
+<StatusOverlays bind:confirm={confirm} {error} loading={!!submitting || loading} />
 {#if !submitting && !error && me}
   <div>
     <div class="fields">
@@ -171,6 +209,16 @@
             <button on:click={logOut}>{ts(`settings.profile.logout`)}</button>
         </div>
       </div>
+      <div class="field danger-zone m-t">
+        <span class="name">{t('settings.profile.delete-title')}</span>
+        <span class="desc">{t('settings.profile.delete-description')}</span>
+        <div>
+          <button class="error" on:click={requestAccountDeletion}>
+            <Icon icon="tabler:trash-x-filled" />
+            {t('settings.profile.delete')}
+          </button>
+        </div>
+      </div>
     </div>
   </div>
 {/if}
@@ -234,6 +282,19 @@
       object-fit: cover
       aspect-ratio: 1
 
+  .danger-zone
+    margin-top: 1.5rem
+    padding-top: 1.5rem
+    border-top: 1px solid vars.$ov-lighter
+
+    .desc
+      opacity: 0.6
+
+    button
+      display: flex
+      align-items: center
+      gap: 0.5rem
+
 
 
   .cropper-container
diff --git a/AquaNet/src/libs/i18n/en_ref.ts b/AquaNet/src/libs/i18n/en_ref.ts
index 11b296fb..8e115ae9 100644
--- a/AquaNet/src/libs/i18n/en_ref.ts
+++ b/AquaNet/src/libs/i18n/en_ref.ts
@@ -274,6 +274,11 @@ export const EN_REF_SETTINGS = {
   'settings.profile.unset': 'Unset',
   'settings.profile.logout': 'Log out',
   'settings.profile.unchanged': 'Unchanged',
+  'settings.profile.delete-title': 'Delete account',
+  'settings.profile.delete-description': 'Download a backup, then permanently delete your account and all associated game data.',
+  'settings.profile.delete': 'Delete account',
+  'settings.profile.delete-confirm-title': 'Permanently delete your account?',
+  'settings.profile.delete-confirm-message': 'A backup of all game data will be downloaded first. After that, your account and all associated game data will be permanently deleted. This cannot be undone.',
   'settings.export': 'Export Player Data',
   'settings.batchManualExport': "Export in Batch Manual (for Tachi)",
   'settings.cabNotice': "These settings only apply for your keychip. If you're playing on someone else's setup, please ask them to change these settings.",
diff --git a/AquaNet/src/libs/i18n/zh.ts b/AquaNet/src/libs/i18n/zh.ts
index ca416d36..33b8555b 100644
--- a/AquaNet/src/libs/i18n/zh.ts
+++ b/AquaNet/src/libs/i18n/zh.ts
@@ -287,6 +287,11 @@ const zhSettings: typeof EN_REF_SETTINGS = {
   'settings.profile.unset': '未设置',
   'settings.profile.logout': '登出',
   'settings.profile.unchanged': '未更改',
+  'settings.profile.delete-title': '删除账户',
+  'settings.profile.delete-description': '下载备份后，永久删除您的账户及所有关联游戏数据。',
+  'settings.profile.delete': '删除账户',
+  'settings.profile.delete-confirm-title': '永久删除您的账户？',
+  'settings.profile.delete-confirm-message': '系统会先下载所有游戏数据的备份，然后永久删除您的账户及所有关联游戏数据。此操作无法撤销。',
   'settings.export': '导出玩家数据',
   'settings.batchManualExport': "导出 Batch Manual 格式（用于 Tachi）",
   'settings.cabNotice': '注意：下面这些设置只会影响你自己的机器,如果你是在其他人的机器上玩的话,请联系机主来改设置',
diff --git a/AquaNet/src/libs/sdk.ts b/AquaNet/src/libs/sdk.ts
index 7b1e41da..a6187a65 100644
--- a/AquaNet/src/libs/sdk.ts
+++ b/AquaNet/src/libs/sdk.ts
@@ -14,6 +14,8 @@ import type {
 } from './generalTypes'
 import type { GameName } from './scoring'
 
+export type ExportGameName = GameName | 'diva'
+
 interface ExtReqInit extends RequestInit {
   params?: { [index: string]: string }
   json?: any
@@ -203,6 +205,8 @@ export const USER = {
   ensureLoggedIn,
   changeRegion: (regionId: number) =>
     post('/api/v2/user/change-region', { regionId }),
+  deleteAccount: () =>
+    post('/api/v2/user/delete-account'),
 }
 
 export const USERBOX = {
@@ -236,7 +240,7 @@ export const GAME = {
     post(`/api/v2/game/${game}/ranking`, typeof page === "number" ? { page } : {}),
   changeName: (game: GameName, newName: string): Promise<{ newName: string }> =>
     post(`/api/v2/game/${game}/change-name`, { newName }),
-  export: (game: GameName): Promise<Record<string, any>> =>
+  export: (game: ExportGameName): Promise<Record<string, any>> =>
     post(`/api/v2/game/${game}/export`),
   import: (game: GameName, data: any): Promise<Record<string, any>> =>
     post(`/api/v2/game/${game}/import`, {}, { json: data }),
diff --git a/src/main/java/icu/samnyan/aqua/net/UserRegistrar.kt b/src/main/java/icu/samnyan/aqua/net/UserRegistrar.kt
index 038f9059..33ec414f 100644
--- a/src/main/java/icu/samnyan/aqua/net/UserRegistrar.kt
+++ b/src/main/java/icu/samnyan/aqua/net/UserRegistrar.kt
@@ -2,25 +2,40 @@ package icu.samnyan.aqua.net
 
 import ext.*
 import icu.samnyan.aqua.net.components.*
-import icu.samnyan.aqua.net.db.AquaNetUser
-import icu.samnyan.aqua.net.db.AquaNetUserRepo
-import icu.samnyan.aqua.net.db.AquaUserServices
-import icu.samnyan.aqua.net.db.EmailConfirmationRepo
-import icu.samnyan.aqua.net.db.ResetPasswordRepo
+import icu.samnyan.aqua.net.db.AquaNetUser
+import icu.samnyan.aqua.net.db.AquaNetUserRepo
+import icu.samnyan.aqua.net.db.AquaUserServices
+import icu.samnyan.aqua.net.db.EmailConfirmationRepo
+import icu.samnyan.aqua.net.db.ResetPasswordRepo
 import icu.samnyan.aqua.net.utils.AquaNetProps
 import icu.samnyan.aqua.net.utils.PathProps
 import icu.samnyan.aqua.net.utils.SUCCESS
-import icu.samnyan.aqua.sega.allnet.UserKeychip
-import icu.samnyan.aqua.sega.allnet.UserKeychipRepo
-import icu.samnyan.aqua.sega.general.dao.CardRepository
-import icu.samnyan.aqua.sega.general.model.CardStatus
-import jakarta.servlet.http.HttpServletRequest
-import org.slf4j.LoggerFactory
-import org.springframework.security.crypto.password.PasswordEncoder
-import org.springframework.web.bind.annotation.RestController
-import org.springframework.web.multipart.MultipartFile
-import java.time.Instant
-import kotlin.io.path.writeBytes
+import icu.samnyan.aqua.sega.allnet.UserKeychip
+import icu.samnyan.aqua.sega.allnet.UserKeychipRepo
+import icu.samnyan.aqua.sega.chusan.model.Chu3Repos
+import icu.samnyan.aqua.sega.diva.DivaRepos
+import icu.samnyan.aqua.sega.diva.model.db.userdata.PlayerProfile
+import icu.samnyan.aqua.sega.general.dao.CardRepository
+import icu.samnyan.aqua.sega.general.model.Card
+import icu.samnyan.aqua.sega.general.model.CardStatus
+import icu.samnyan.aqua.sega.maimai2.model.Mai2Repos
+import icu.samnyan.aqua.sega.ongeki.OngekiUserRepos
+import icu.samnyan.aqua.sega.wacca.model.db.WaccaRepos
+import jakarta.servlet.http.HttpServletRequest
+import jakarta.transaction.Transactional
+import org.slf4j.LoggerFactory
+import org.springframework.security.crypto.password.PasswordEncoder
+import org.springframework.stereotype.Service
+import org.springframework.web.bind.annotation.RestController
+import org.springframework.web.multipart.MultipartFile
+import java.nio.file.Files
+import java.nio.file.Path
+import java.time.Instant
+import kotlin.io.path.Path
+import kotlin.io.path.deleteIfExists
+import kotlin.io.path.exists
+import kotlin.io.path.name
+import kotlin.io.path.writeBytes
 
 @RestController
 @API("/api/v2/user")
@@ -39,7 +54,8 @@ class UserRegistrar(
     val emailProps: EmailProperties,
     val userKeychipRepo: UserKeychipRepo,
     val aquaNetProps: AquaNetProps,
-    final val paths: PathProps
+    final val paths: PathProps,
+    val accountDeletion: AccountDeletionService,
 ) {
     val portraitPath = paths.aquaNetPortrait.path()
 
@@ -327,14 +343,105 @@ class UserRegistrar(
 
     @API("/change-region")
     @Doc("Change the region of the user.", "Success message")
-    suspend fun changeRegion(@RP token: Str, @RP regionId: Str) = jwt.auth(token) { u ->
+    suspend fun changeRegion(@RP token: Str, @RP regionId: Str) = jwt.auth(token) { u ->
         // Check if the region is valid (between 1 and 47)
         val r = regionId.toIntOrNull() ?: (400 - "Invalid region")
         if (r !in 1..47) 400 - "Invalid region"
         async {
 	        userRepo.save(u.apply { region = r.toString() })
         }
-
-        SUCCESS
-    }
-}
+
+        SUCCESS
+    }
+
+    @API("/delete-account")
+    @Doc("Permanently delete the current user's account and all associated game data.", "Success message")
+    fun deleteAccount(@RP token: Str) = jwt.auth(token) { user ->
+        val cleanup = accountDeletion.deleteDatabaseData(user.auId)
+        accountDeletion.deleteUploadedFiles(cleanup)
+        SUCCESS
+    }
+}
+
+data class AccountFileCleanup(
+    val profilePicture: String?,
+    val gameUserId: Long,
+    val divaScreenshots: List<String>,
+)
+
+@Service
+class AccountDeletionService(
+    val userRepo: AquaNetUserRepo,
+    val cardRepo: CardRepository,
+    val mai2: Mai2Repos,
+    val chu3: Chu3Repos,
+    val ongeki: OngekiUserRepos,
+    val wacca: WaccaRepos,
+    val diva: DivaRepos,
+    val paths: PathProps,
+) {
+    companion object {
+        val log = logger()
+    }
+
+    @Transactional
+    fun deleteDatabaseData(auId: Long): AccountFileCleanup {
+        val user = userRepo.findByAuId(auId) ?: (404 - "User not found")
+        val ghostCard = user.ghostCard
+        val divaScreenshots = deleteDiva(ghostCard)
+
+        mai2.userData.findByCard(ghostCard)?.let { mai2.userData.delete(it) }
+        chu3.userData.findByCard(ghostCard)?.let { chu3.userData.delete(it) }
+        ongeki.data.findByCard(ghostCard)?.let { ongeki.data.delete(it) }
+        wacca.user.findByCard(ghostCard)?.let { wacca.user.delete(it) }
+        chu3.userLoginBonus.deleteAll(chu3.userLoginBonus.findByUser(ghostCard.extId.toInt()))
+
+        // Keep Hibernate's managed state consistent with the database-level ON DELETE SET NULL.
+        // Hibernate 7 rejects the flush if a managed card still references the deleted user.
+        val linkedCards = cardRepo.findAllByAquaUserAuId(auId)
+        linkedCards.forEach { it.aquaUser = null }
+        cardRepo.saveAllAndFlush(linkedCards)
+
+        userRepo.delete(user)
+        userRepo.flush()
+        cardRepo.delete(ghostCard)
+        cardRepo.flush()
+
+        log.info("Deleted account and game data for user $auId")
+        return AccountFileCleanup(user.profilePicture, ghostCard.extId, divaScreenshots)
+    }
+
+    private fun deleteDiva(card: Card): List<String> {
+        val profile: PlayerProfile = diva.profile.findByPdId(card.extId).orElse(null) ?: return emptyList()
+        val screenshots = diva.screenShot.findByPdId(profile)
+
+        diva.profile.delete(profile)
+
+        return screenshots.map { it.fileName }
+    }
+
+    fun deleteUploadedFiles(cleanup: AccountFileCleanup) {
+        try {
+            cleanup.profilePicture
+                ?.takeIf { it.isNotBlank() && Path(it).name == it }
+                ?.let { (Path(paths.aquaNetPortrait) / it).deleteIfExists() }
+
+            deleteFilesStartingWith(Path(paths.mai2Portrait), "${cleanup.gameUserId}-")
+            deleteFilesStartingWith(Path(paths.mai2Plays), "${cleanup.gameUserId}-")
+            deleteFilesStartingWith(Path("data/tmp"), "${cleanup.gameUserId}-")
+            cleanup.divaScreenshots
+                .filter { Path(it).name == it }
+                .forEach { (Path("data") / it).deleteIfExists() }
+        } catch (e: Exception) {
+            log.error("Failed to delete one or more uploaded files for deleted user ${cleanup.gameUserId}", e)
+        }
+    }
+
+    private fun deleteFilesStartingWith(directory: Path, prefix: String) {
+        if (!directory.exists()) return
+        Files.list(directory).use { files ->
+            files.filter { it.fileName.toString().startsWith(prefix) }
+                .forEach { it.deleteIfExists() }
+        }
+    }
+}
diff --git a/src/main/java/icu/samnyan/aqua/net/db/AquaEmailConfirmation.kt b/src/main/java/icu/samnyan/aqua/net/db/AquaEmailConfirmation.kt
index 9a324647..ec347b8d 100644
--- a/src/main/java/icu/samnyan/aqua/net/db/AquaEmailConfirmation.kt
+++ b/src/main/java/icu/samnyan/aqua/net/db/AquaEmailConfirmation.kt
@@ -1,7 +1,9 @@
 package icu.samnyan.aqua.net.db
 
 import jakarta.persistence.*
-import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.data.jpa.repository.JpaRepository
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import org.springframework.stereotype.Repository
 import java.io.Serializable
 import java.time.Instant
@@ -20,9 +22,10 @@ class EmailConfirmation(
     @Column(nullable = false)
     var createdAt: Instant = Instant.now(),
 
-    // Linking to the AquaNetUser
-    @ManyToOne
-    @JoinColumn(name = "auId", referencedColumnName = "auId")
+    // Linking to the AquaNetUser
+    @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
+    @JoinColumn(name = "auId", referencedColumnName = "auId")
     var aquaNetUser: AquaNetUser = AquaNetUser()
 ) : Serializable
 
@@ -30,4 +33,4 @@ class EmailConfirmation(
 interface EmailConfirmationRepo : JpaRepository<EmailConfirmation, Long> {
     fun findByToken(token: String): EmailConfirmation?
     fun findByAquaNetUserAuId(auId: Long): List<EmailConfirmation>
-}
\ No newline at end of file
+}
diff --git a/src/main/java/icu/samnyan/aqua/net/db/AquaEmailResetPassword.kt b/src/main/java/icu/samnyan/aqua/net/db/AquaEmailResetPassword.kt
index 98a0281c..729c24aa 100644
--- a/src/main/java/icu/samnyan/aqua/net/db/AquaEmailResetPassword.kt
+++ b/src/main/java/icu/samnyan/aqua/net/db/AquaEmailResetPassword.kt
@@ -2,6 +2,8 @@ package icu.samnyan.aqua.net.db
 
 import jakarta.persistence.*
 import org.springframework.data.jpa.repository.JpaRepository
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import org.springframework.stereotype.Repository
 import java.io.Serializable
 import java.time.Instant
@@ -22,6 +24,7 @@ class ResetPassword(
 
     // Linking to the AquaNetUser
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "auId", referencedColumnName = "auId")
     var aquaNetUser: AquaNetUser = AquaNetUser()
 ) : Serializable
@@ -30,4 +33,4 @@ class ResetPassword(
 interface ResetPasswordRepo : JpaRepository<ResetPassword, Long> {
     fun findByToken(token: String): ResetPassword?
     fun findByAquaNetUserAuId(auId: Long): List<ResetPassword>
-}
\ No newline at end of file
+}
diff --git a/src/main/java/icu/samnyan/aqua/net/db/AquaNetSession.kt b/src/main/java/icu/samnyan/aqua/net/db/AquaNetSession.kt
index f3f24d52..0b7220a7 100644
--- a/src/main/java/icu/samnyan/aqua/net/db/AquaNetSession.kt
+++ b/src/main/java/icu/samnyan/aqua/net/db/AquaNetSession.kt
@@ -2,6 +2,8 @@ package icu.samnyan.aqua.net.db
 
 import jakarta.persistence.*
 import org.springframework.data.jpa.repository.JpaRepository
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import org.springframework.stereotype.Repository
 import java.io.Serializable
 import java.time.Instant
@@ -22,6 +24,7 @@ class SessionToken(
 
     // Linking to the AquaNetUser
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "auId", referencedColumnName = "auId")
     var aquaNetUser: AquaNetUser = AquaNetUser()
 ) : Serializable
diff --git a/src/main/java/icu/samnyan/aqua/net/db/AquaNetUser.kt b/src/main/java/icu/samnyan/aqua/net/db/AquaNetUser.kt
index db2b2b5a..c80ba967 100644
--- a/src/main/java/icu/samnyan/aqua/net/db/AquaNetUser.kt
+++ b/src/main/java/icu/samnyan/aqua/net/db/AquaNetUser.kt
@@ -69,23 +69,23 @@ class AquaNetUser(
     // Email confirmation
     var emailConfirmed: Boolean = false,
 
-    @OneToOne(cascade = [CascadeType.ALL])
+    @OneToOne(cascade = [CascadeType.PERSIST, CascadeType.MERGE])
     @JoinColumn(name = "ghostCard", unique = true, nullable = false)
     var ghostCard: Card = Card(),
 
     // One user can have multiple cards
-    @OneToMany(mappedBy = "aquaUser", cascade = [CascadeType.ALL])
+    @OneToMany(mappedBy = "aquaUser", cascade = [CascadeType.PERSIST, CascadeType.MERGE])
     var cards: MutableList<Card> = mutableListOf(),
 
     // Each user can have multiple keychips (if the user owns cabinets)
     @JsonIgnore
-    @OneToMany(mappedBy = "user", cascade = [CascadeType.ALL])
-    var keychips: MutableList<UserKeychip> = mutableListOf(),
+    @OneToMany(mappedBy = "user", cascade = [CascadeType.PERSIST, CascadeType.MERGE])
+    var keychips: MutableList<UserKeychip> = mutableListOf(),
 
     // Each user's keychip can have multiple sessions
     @JsonIgnore
-    @OneToMany(mappedBy = "user", cascade = [CascadeType.ALL])
-    var keychipSessions: MutableList<KeychipSession> = mutableListOf(),
+    @OneToMany(mappedBy = "user", cascade = [CascadeType.PERSIST, CascadeType.MERGE])
+    var keychipSessions: MutableList<KeychipSession> = mutableListOf(),
 
     @Column(nullable = false)
     var canModifyKeychips: Boolean = false,
diff --git a/src/main/java/icu/samnyan/aqua/net/games/chu3/Chu3Import.kt b/src/main/java/icu/samnyan/aqua/net/games/chu3/Chu3Import.kt
index d2fd3dba..56eb8b1b 100644
--- a/src/main/java/icu/samnyan/aqua/net/games/chu3/Chu3Import.kt
+++ b/src/main/java/icu/samnyan/aqua/net/games/chu3/Chu3Import.kt
@@ -3,6 +3,7 @@ package icu.samnyan.aqua.net.games.chu3
 import ext.API
 import ext.returns
 import ext.vars
+import icu.samnyan.aqua.net.games.ExportOptions
 import icu.samnyan.aqua.net.games.IExportClass
 import icu.samnyan.aqua.net.games.ImportClass
 import icu.samnyan.aqua.net.games.ImportController
@@ -12,6 +13,7 @@ import icu.samnyan.aqua.sega.chusan.model.userdata.*
 import org.springframework.web.bind.annotation.RestController
 import kotlin.reflect.full.declaredMembers
 
+@Suppress("UNCHECKED_CAST")
 @RestController
 @API("api/v2/game/chu3")
 class Chu3Import(
@@ -22,7 +24,7 @@ class Chu3Import(
         it.name.replace("List", "").lowercase()
     },
     exportRepos = Chu3DataExport::class.vars()
-        .filter { f -> f.name !in setOf("gameId", "userData") }
+        .filter { f -> f.name !in setOf("gameId", "userData", "userLoginBonusList") }
         .associateWith { Chu3Repos::class.declaredMembers
             .filter { f -> f returns Chu3UserLinked::class }
             .firstOrNull { f -> f.name == it.name || f.name == it.name.replace("List", "") }
@@ -44,7 +46,22 @@ class Chu3Import(
 //        "chuni_profile_emoney" to ImportClass(UserEmoney::class),
 //        "chuni_profile_overpower" to ImportClass(UserOverpower::class),
 //        "chuni_profile_recent_rating" to ImportClass(UserRecentRating::class),
-    )
+    ),
+    customExporters = mapOf(
+        Chu3DataExport::userLoginBonusList to { user: Chu3UserData, _: ExportOptions ->
+            repos.userLoginBonus.findByUser(user.card!!.extId.toInt())
+        },
+    ) as Map<kotlin.reflect.KMutableProperty1<Chu3DataExport, Any>, (Chu3UserData, ExportOptions) -> Any?>,
+    customImporters = mapOf(
+        Chu3DataExport::userLoginBonusList to { export: Chu3DataExport, user: Chu3UserData ->
+            val userId = user.card!!.extId.toInt()
+            repos.userLoginBonus.deleteAll(repos.userLoginBonus.findByUser(userId))
+            repos.userLoginBonus.saveAll(export.userLoginBonusList.map { it.apply {
+                id = 0
+                this.user = userId
+            } })
+        },
+    ) as Map<kotlin.reflect.KMutableProperty1<Chu3DataExport, Any>, (Chu3DataExport, Chu3UserData) -> Unit>,
 ) {
     override fun createEmpty() = Chu3DataExport()
     override val userDataRepo = repos.userData
@@ -67,6 +84,16 @@ data class Chu3DataExport(
     var userMateList: List<UserMate> = emptyList(),
     var userGeneralDataList: List<UserGeneralData> = emptyList(),
     var userMiscList: Chu3UserMisc = Chu3UserMisc(),
+    var userCardPrintStateList: List<UserCardPrintState> = emptyList(),
+    var userGachaList: List<UserGacha> = emptyList(),
+    var userRegionsList: List<UserRegions> = emptyList(),
+    var userCMissionList: List<UserCMission> = emptyList(),
+    var userCMissionProgressList: List<UserCMissionProgress> = emptyList(),
+    var netBattleLogList: List<Chu3NetBattleLog> = emptyList(),
+    var userChallengeList: List<Chu3UserChallenge> = emptyList(),
+    var userLinkedVerseList: List<Chu3UserLinkedVerse> = emptyList(),
+    var userVoteList: List<UserVote> = emptyList(),
+    var userLoginBonusList: List<UserLoginBonus> = emptyList(),
 ): IExportClass<Chu3UserData> {
     constructor() : this("SDHD",
         Chu3UserData(), UserGameOption(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), ArrayList(), Chu3UserMisc())
diff --git a/src/main/java/icu/samnyan/aqua/net/games/diva/DivaExport.kt b/src/main/java/icu/samnyan/aqua/net/games/diva/DivaExport.kt
new file mode 100644
index 00000000..edce958e
--- /dev/null
+++ b/src/main/java/icu/samnyan/aqua/net/games/diva/DivaExport.kt
@@ -0,0 +1,33 @@
+package icu.samnyan.aqua.net.games.diva
+
+import ext.*
+import icu.samnyan.aqua.net.db.AquaUserServices
+import icu.samnyan.aqua.sega.diva.DivaRepos
+import org.springframework.web.bind.annotation.RestController
+
+@RestController
+@API("api/v2/game/diva")
+class DivaExport(
+    val us: AquaUserServices,
+    val repos: DivaRepos,
+) {
+    @API("export")
+    fun exportUserData(@RP token: Str) = us.jwt.auth(token) { account ->
+        val profile = repos.profile.findByPdId(account.ghostCard.extId).orElse(null)
+            ?: (404 - "User not found")
+
+        linkedMapOf(
+            "gameId" to "SBZV",
+            "userData" to profile,
+            "gameSession" to repos.gameSession.findByPdId(profile).orElse(null),
+            "playLogList" to repos.playLog.findByPdId(profile),
+            "playerContestList" to repos.contest.findByPdId(profile),
+            "playerCustomizeList" to repos.customize.findByPdId(profile),
+            "playerInventoryList" to repos.inventory.findByPdId(profile),
+            "playerModuleList" to repos.module.findByPdId(profile),
+            "playerPvCustomizeList" to repos.pvCustomize.findByPdId(profile),
+            "playerPvRecordList" to repos.pvRecord.findByPdId(profile),
+            "playerScreenShotList" to repos.screenShot.findByPdId(profile),
+        )
+    }
+}
diff --git a/src/main/java/icu/samnyan/aqua/net/games/mai2/Mai2Import.kt b/src/main/java/icu/samnyan/aqua/net/games/mai2/Mai2Import.kt
index 850d0bb6..79c935a9 100644
--- a/src/main/java/icu/samnyan/aqua/net/games/mai2/Mai2Import.kt
+++ b/src/main/java/icu/samnyan/aqua/net/games/mai2/Mai2Import.kt
@@ -68,7 +68,7 @@ class Mai2Import(
                 ?.split(",")
                 ?.mapIndexed { index, id -> Mai2UserFavoriteItem().apply { orderId = index; this.id = id.toInt() } }
                 ?: emptyList()
-        }
+        },
     ) as Map<kotlin.reflect.KMutableProperty1<Maimai2DataExport, Any>, (Mai2UserDetail, ExportOptions) -> Any?>,
     customImporters = mapOf(
         Maimai2DataExport::userPlaylogList to { export: Maimai2DataExport, user: Mai2UserDetail ->
@@ -85,7 +85,7 @@ class Mai2Import(
                     propertyValue = favoriteMusicList.sortedBy { it.orderId }.map { it.id }.joinToString(",")
                 })
             }
-        }
+        },
     ) as Map<kotlin.reflect.KMutableProperty1<Maimai2DataExport, Any>, (Maimai2DataExport, Mai2UserDetail) -> Unit>
 ) {
     override fun createEmpty() = Maimai2DataExport()
@@ -113,6 +113,9 @@ data class Maimai2DataExport(
     var userFavoriteMusicList: List<Mai2UserFavoriteItem> = mutableListOf(),
     var userKaleidxScopeList: List<Mai2UserKaleidx> = mutableListOf(),
     var userPlaylogList: List<Mai2UserPlaylog> = mutableListOf(),
+    var userCardList: List<Mai2UserCard> = mutableListOf(),
+    var userPrintDetailList: List<Mai2UserPrintDetail> = mutableListOf(),
+    var userRegionsList: List<UserRegions> = mutableListOf(),
     // Not supported yet:
     // var userWeeklyData
     // var userMissionDataList
diff --git a/src/main/java/icu/samnyan/aqua/net/games/wacca/Wacca.kt b/src/main/java/icu/samnyan/aqua/net/games/wacca/Wacca.kt
index 8dad1db3..8c87c258 100644
--- a/src/main/java/icu/samnyan/aqua/net/games/wacca/Wacca.kt
+++ b/src/main/java/icu/samnyan/aqua/net/games/wacca/Wacca.kt
@@ -1,16 +1,10 @@
 package icu.samnyan.aqua.net.games.wacca
 
-import ext.API
-import ext.RP
-import ext.isoDate
-import ext.utc
+import ext.*
 import icu.samnyan.aqua.net.db.AquaUserServices
 import icu.samnyan.aqua.net.games.*
 import icu.samnyan.aqua.net.utils.waccaScores
-import icu.samnyan.aqua.sega.wacca.model.db.WaccaUser
-import icu.samnyan.aqua.sega.wacca.model.db.WcUserBestScoreRepo
-import icu.samnyan.aqua.sega.wacca.model.db.WcUserPlayLogRepo
-import icu.samnyan.aqua.sega.wacca.model.db.WcUserRepo
+import icu.samnyan.aqua.sega.wacca.model.db.*
 import org.springframework.web.bind.annotation.RestController
 
 @RestController
@@ -20,6 +14,7 @@ class Wacca(
     override val playlogRepo: WcUserPlayLogRepo,
     override val userDataRepo: WcUserRepo,
     override val userMusicRepo: WcUserBestScoreRepo,
+    val repos: WaccaRepos,
 ): GameApiController<WaccaUser>("wacca", WaccaUser::class) {
     override val settableFields: Map<String, (WaccaUser, String) -> Unit> by lazy { mapOf(
         "userName" to usernameCheck(true),
@@ -40,5 +35,38 @@ class Wacca(
         genericUserSummary(card, mapOf(), null, data?.favoriteSongs)
     }
 
+    @API("export")
+    fun exportUserData(@RP token: Str) = us.jwt.auth(token) { account ->
+        val user = repos.user.findByCard(account.ghostCard) ?: (404 - "User not found")
+        WaccaDataExport(
+            userData = user,
+            userOptionList = repos.option.findByUser(user),
+            userBingoList = repos.bingo.findByUser(user),
+            userFriendList = repos.friend.findByUser(user).map {
+                WaccaFriendExport(it.with.id, it.isAccepted)
+            },
+            userGateList = repos.gate.findByUser(user),
+            userItemList = repos.item.findByUser(user),
+            userBestScoreList = repos.bestScore.findByUser(user),
+            userPlaylogList = repos.playLog.findByUser(user),
+            userStageUpList = repos.stageUp.findByUser(user),
+        )
+    }
+
     override val shownRanks: List<Pair<Int, String>> = waccaScores.filter { it.first > 85 * 10000 }
 }
+
+data class WaccaFriendExport(val withUserId: Long, val isAccepted: Boolean)
+
+data class WaccaDataExport(
+    val gameId: String = "SDFE",
+    val userData: WaccaUser,
+    val userOptionList: List<WcUserOption>,
+    val userBingoList: List<WcUserBingo>,
+    val userFriendList: List<WaccaFriendExport>,
+    val userGateList: List<WcUserGate>,
+    val userItemList: List<WcUserItem>,
+    val userBestScoreList: List<WcUserScore>,
+    val userPlaylogList: List<WcUserPlayLog>,
+    val userStageUpList: List<WcUserStageUp>,
+)
diff --git a/src/main/java/icu/samnyan/aqua/sega/allnet/KeychipSession.kt b/src/main/java/icu/samnyan/aqua/sega/allnet/KeychipSession.kt
index 143e55d8..f53e014f 100644
--- a/src/main/java/icu/samnyan/aqua/sega/allnet/KeychipSession.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/allnet/KeychipSession.kt
@@ -5,7 +5,9 @@ import icu.samnyan.aqua.net.db.AquaNetUser
 import jakarta.persistence.*
 import jakarta.transaction.Transactional
 import org.slf4j.LoggerFactory
-import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.data.jpa.repository.JpaRepository
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import org.springframework.scheduling.annotation.Scheduled
 import org.springframework.stereotype.Repository
 import org.springframework.stereotype.Service
@@ -18,9 +20,10 @@ import java.security.SecureRandom
 @Table(name = "allnet_keychip_sessions", indexes = [
     Index(name = "idx_last_use", columnList = "lastUse")
 ])
-class KeychipSession(
-    @ManyToOne
-    @JoinColumn(name = "au_id")
+class KeychipSession(
+    @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
+    @JoinColumn(name = "au_id")
     var user: AquaNetUser? = null,
 
     @Column(length = 4)
@@ -45,12 +48,12 @@ fun genUrlSafeToken(length: Int): String {
 }
 
 @Repository("KeychipSessionRepo")
-interface KeychipSessionRepo : JpaRepository<KeychipSession, String> {
-    fun findByToken(token: String): KeychipSession?
-
-    @Transactional
-    fun deleteAllByLastUseBefore(expire: Long)
-}
+interface KeychipSessionRepo : JpaRepository<KeychipSession, String> {
+    fun findByToken(token: String): KeychipSession?
+
+    @Transactional
+    fun deleteAllByLastUseBefore(expire: Long)
+}
 
 @Service
 class KeychipSessionService(
diff --git a/src/main/java/icu/samnyan/aqua/sega/allnet/UserKeychip.kt b/src/main/java/icu/samnyan/aqua/sega/allnet/UserKeychip.kt
index 49e70c80..5c73a69a 100644
--- a/src/main/java/icu/samnyan/aqua/sega/allnet/UserKeychip.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/allnet/UserKeychip.kt
@@ -4,6 +4,8 @@ import icu.samnyan.aqua.net.db.AquaNetUser
 import jakarta.persistence.*
 import jakarta.transaction.Transactional
 import org.springframework.data.jpa.repository.JpaRepository
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import org.springframework.stereotype.Repository
 
 @Entity
@@ -13,6 +15,7 @@ class UserKeychip(
     val id: Long = 0,
 
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "au_id", nullable = false)
     var user: AquaNetUser,
 
diff --git a/src/main/java/icu/samnyan/aqua/sega/chusan/model/Chu3Repos.kt b/src/main/java/icu/samnyan/aqua/sega/chusan/model/Chu3Repos.kt
index ff318f75..cb95b51e 100644
--- a/src/main/java/icu/samnyan/aqua/sega/chusan/model/Chu3Repos.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/chusan/model/Chu3Repos.kt
@@ -27,8 +27,10 @@ interface Chu3UserLinked<T : Any> : IUserRepo<Chu3UserData, T> {
 
 // This repo cannot be generalized as UserLinked because the entity stores user as an int
 // TODO: Find a way to generalize this
-interface Chu3UserLoginBonusRepo : JpaRepository<UserLoginBonus, Long> {
-    @Query(
+interface Chu3UserLoginBonusRepo : JpaRepository<UserLoginBonus, Long> {
+    fun findByUser(userId: Int): List<UserLoginBonus>
+
+    @Query(
         value = "select * from chusan_user_login_bonus where user = ?1 and version = ?2 and is_finished = ?3 order by last_update_date desc",
         nativeQuery = true
     )
diff --git a/src/main/java/icu/samnyan/aqua/sega/chusan/model/userdata/Chu3UserEntity.kt b/src/main/java/icu/samnyan/aqua/sega/chusan/model/userdata/Chu3UserEntity.kt
index a45722f1..b02c739c 100644
--- a/src/main/java/icu/samnyan/aqua/sega/chusan/model/userdata/Chu3UserEntity.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/chusan/model/userdata/Chu3UserEntity.kt
@@ -6,11 +6,14 @@ import icu.samnyan.aqua.net.games.IUserEntity
 import jakarta.persistence.JoinColumn
 import jakarta.persistence.ManyToOne
 import jakarta.persistence.MappedSuperclass
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 
 @MappedSuperclass
 class Chu3UserEntity : BaseEntity(), IUserEntity<Chu3UserData> {
     @JsonIgnore
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "user_id")
     override var user: Chu3UserData = Chu3UserData()
-}
\ No newline at end of file
+}
diff --git a/src/main/java/icu/samnyan/aqua/sega/diva/DivaRepos.kt b/src/main/java/icu/samnyan/aqua/sega/diva/DivaRepos.kt
index c1d19284..d22776a1 100644
--- a/src/main/java/icu/samnyan/aqua/sega/diva/DivaRepos.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/diva/DivaRepos.kt
@@ -67,6 +67,8 @@ interface PvEntryRepository : JpaRepository<PvEntry, Int> {
 }
 
 interface PlayerContestRepository : JpaRepository<PlayerContest, Long> {
+    fun findByPdId(pdId: PlayerProfile): MutableList<PlayerContest>
+
     fun findByPdIdAndContestId(pdId: PlayerProfile, contestId: Int): Optional<PlayerContest>
 
     fun findTop4ByPdIdOrderByLastUpdateTimeDesc(pdId: PlayerProfile): MutableList<PlayerContest>
@@ -86,6 +88,8 @@ interface PlayerCustomizeRepository : JpaRepository<PlayerCustomize, Long> {
 
 @Repository
 interface PlayerInventoryRepository : JpaRepository<PlayerInventory, Long> {
+    fun findByPdId(profile: PlayerProfile): MutableList<PlayerInventory>
+
     fun findByPdIdAndTypeAndValue(profile: PlayerProfile, type: String, value: String): Optional<PlayerInventory>
 }
 
@@ -96,6 +100,8 @@ interface PlayerProfileRepository : JpaRepository<PlayerProfile, Long> {
 
 @Repository
 interface PlayerPvCustomizeRepository : JpaRepository<PlayerPvCustomize, Long> {
+    fun findByPdId(profile: PlayerProfile): MutableList<PlayerPvCustomize>
+
     fun findByPdIdAndPvId(profile: PlayerProfile, pvId: Int): Optional<PlayerPvCustomize>
 }
 
@@ -139,12 +145,16 @@ interface PlayerPvRecordRepository : JpaRepository<PlayerPvRecord, Long> {
     ): MutableList<PlayerPvRecord>
 }
 
-interface PlayerScreenShotRepository : JpaRepository<PlayerScreenShot, Long>
+interface PlayerScreenShotRepository : JpaRepository<PlayerScreenShot, Long> {
+    fun findByPdId(profile: PlayerProfile): MutableList<PlayerScreenShot>
+}
 
 @Repository
-interface PlayLogRepository : JpaRepository<PlayLog, Long>
+interface PlayLogRepository : JpaRepository<PlayLog, Long> {
+    fun findByPdId(profile: PlayerProfile): MutableList<PlayLog>
+}
 
 @Repository
 interface PlayerModuleRepository : JpaRepository<PlayerModule, Long> {
     fun findByPdId(profile: PlayerProfile): MutableList<PlayerModule>
-}
\ No newline at end of file
+}
diff --git a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/GameSession.kt b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/GameSession.kt
index c3fed1e5..d4a91924 100644
--- a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/GameSession.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/GameSession.kt
@@ -2,6 +2,8 @@ package icu.samnyan.aqua.sega.diva.model.db.userdata
 
 import icu.samnyan.aqua.sega.diva.model.common.StartMode
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.io.Serializable
 import java.time.LocalDateTime
 
@@ -14,6 +16,7 @@ class GameSession : Serializable {
     var acceptId = 0
 
     @OneToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "pd_id", unique = true)
     var pdId: PlayerProfile = PlayerProfile()
 
diff --git a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayLog.kt b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayLog.kt
index 0c79f6c6..65692034 100644
--- a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayLog.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayLog.kt
@@ -6,6 +6,8 @@ import icu.samnyan.aqua.sega.diva.model.common.ClearResult
 import icu.samnyan.aqua.sega.diva.model.common.Difficulty
 import icu.samnyan.aqua.sega.diva.model.common.Edition
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.io.Serializable
 import java.time.LocalDateTime
 
@@ -17,6 +19,7 @@ class PlayLog : Serializable {
     var id: Long = 0
 
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "pd_id")
     @JsonIgnore
     var pdId: PlayerProfile = PlayerProfile()
diff --git a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerContest.kt b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerContest.kt
index ca00f302..0be1ad04 100644
--- a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerContest.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerContest.kt
@@ -2,6 +2,8 @@ package icu.samnyan.aqua.sega.diva.model.db.userdata
 
 import icu.samnyan.aqua.sega.diva.model.common.ContestBorder
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.io.Serializable
 import java.time.LocalDateTime
 
@@ -13,6 +15,7 @@ class PlayerContest : Serializable {
     var id: Long = 0
 
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "pd_id")
     var pdId: PlayerProfile = PlayerProfile()
 
diff --git a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerCustomize.kt b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerCustomize.kt
index a59ae4d8..513dfd2f 100644
--- a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerCustomize.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerCustomize.kt
@@ -1,6 +1,8 @@
 package icu.samnyan.aqua.sega.diva.model.db.userdata
 
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.io.Serializable
 
 @Entity(name = "DivaPlayerCustomize")
@@ -11,6 +13,7 @@ class PlayerCustomize : Serializable {
     var id: Long = 0
 
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "pd_id")
     var pdId: PlayerProfile = PlayerProfile()
 
diff --git a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerInventory.kt b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerInventory.kt
index 6d7e7901..13225bbf 100644
--- a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerInventory.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerInventory.kt
@@ -2,6 +2,8 @@ package icu.samnyan.aqua.sega.diva.model.db.userdata
 
 import com.fasterxml.jackson.annotation.JsonIgnore
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.io.Serializable
 
 @Entity(name = "DivaPlayerInventory")
@@ -12,6 +14,7 @@ class PlayerInventory : Serializable {
     var id: Long = 0
 
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "pd_id")
     @JsonIgnore
     var pdId: PlayerProfile = PlayerProfile()
diff --git a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerModule.kt b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerModule.kt
index 9cc691bd..a7a98ad5 100644
--- a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerModule.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerModule.kt
@@ -1,6 +1,8 @@
 package icu.samnyan.aqua.sega.diva.model.db.userdata
 
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.io.Serializable
 
 @Entity(name = "DivaPlayerModule")
@@ -11,6 +13,7 @@ class PlayerModule : Serializable {
     var id: Long = 0
 
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "pd_id")
     var pdId: PlayerProfile = PlayerProfile()
 
diff --git a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerPvCustomize.kt b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerPvCustomize.kt
index 3e5d276e..0f58cde0 100644
--- a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerPvCustomize.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerPvCustomize.kt
@@ -2,6 +2,8 @@ package icu.samnyan.aqua.sega.diva.model.db.userdata
 
 import com.fasterxml.jackson.annotation.JsonIgnore
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.io.Serializable
 
 @Entity(name = "DivaPlayerPvCustomize")
@@ -12,6 +14,7 @@ class PlayerPvCustomize : Serializable {
     var id: Long = 0
 
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "pd_id")
     @JsonIgnore
     var pdId: PlayerProfile = PlayerProfile()
diff --git a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerPvRecord.kt b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerPvRecord.kt
index 64168803..ee0b428b 100644
--- a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerPvRecord.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerPvRecord.kt
@@ -6,6 +6,8 @@ import icu.samnyan.aqua.sega.diva.model.common.ClearResult
 import icu.samnyan.aqua.sega.diva.model.common.Difficulty
 import icu.samnyan.aqua.sega.diva.model.common.Edition
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.io.Serializable
 
 @Entity(name = "DivaPlayerPvRecord")
@@ -19,6 +21,7 @@ class PlayerPvRecord : Serializable {
     var id: Long = 0
 
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "pd_id")
     @JsonIgnore
     var pdId: PlayerProfile = PlayerProfile()
diff --git a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerScreenShot.kt b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerScreenShot.kt
index 01d0caed..3235d3d5 100644
--- a/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerScreenShot.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/diva/model/db/userdata/PlayerScreenShot.kt
@@ -1,6 +1,8 @@
 package icu.samnyan.aqua.sega.diva.model.db.userdata
 
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 
 @Entity(name = "DivaPlayerScreenShot")
 @Table(name = "diva_player_screen_shot")
@@ -10,6 +12,7 @@ class PlayerScreenShot {
     var id: Long = 0
 
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "pd_id")
     var pdId: PlayerProfile = PlayerProfile()
     var pvId: Long = 0
diff --git a/src/main/java/icu/samnyan/aqua/sega/general/dao/CardRepository.kt b/src/main/java/icu/samnyan/aqua/sega/general/dao/CardRepository.kt
index 538afe78..3307f061 100644
--- a/src/main/java/icu/samnyan/aqua/sega/general/dao/CardRepository.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/general/dao/CardRepository.kt
@@ -11,4 +11,5 @@ import org.springframework.stereotype.Repository
 interface CardRepository : JpaRepository<Card, Long> {
     fun findByExtId(extId: Long): Card?
     fun findByLuid(luid: String): Card?
+    fun findAllByAquaUserAuId(auId: Long): List<Card>
 }
diff --git a/src/main/java/icu/samnyan/aqua/sega/general/model/Card.kt b/src/main/java/icu/samnyan/aqua/sega/general/model/Card.kt
index fcd0183f..9c50ee08 100644
--- a/src/main/java/icu/samnyan/aqua/sega/general/model/Card.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/general/model/Card.kt
@@ -3,6 +3,8 @@ package icu.samnyan.aqua.sega.general.model
 import com.fasterxml.jackson.annotation.JsonIgnore
 import icu.samnyan.aqua.net.db.AquaNetUser
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.time.LocalDateTime
 
 enum class CardStatus {
@@ -59,6 +61,7 @@ class Card(
 
     // Defines the AquaNet user that this card is bound to
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.SET_NULL)
     @JoinColumn(name = "net_user_id")
     @JsonIgnore
     var aquaUser: AquaNetUser? = null,
diff --git a/src/main/java/icu/samnyan/aqua/sega/maimai2/model/Repos.kt b/src/main/java/icu/samnyan/aqua/sega/maimai2/model/Repos.kt
index 90f23f2c..326067a8 100644
--- a/src/main/java/icu/samnyan/aqua/sega/maimai2/model/Repos.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/maimai2/model/Repos.kt
@@ -107,7 +107,7 @@ interface Mai2UserPlaylogRepo : GenericPlaylogRepo<Mai2UserPlaylog>, Mai2UserLin
     fun findByUserAndUserPlayDateAfter(user: Mai2UserDetail, userPlayDate: String): List<Mai2UserPlaylog>
 }
 
-interface Mai2UserPrintDetailRepo : JpaRepository<Mai2UserPrintDetail, Long>
+interface Mai2UserPrintDetailRepo : Mai2UserLinked<Mai2UserPrintDetail>
 
 interface Mai2UserUdemaeRepo : Mai2UserLinked<Mai2UserUdemae>
 
diff --git a/src/main/java/icu/samnyan/aqua/sega/maimai2/model/userdata/UserEntities.kt b/src/main/java/icu/samnyan/aqua/sega/maimai2/model/userdata/UserEntities.kt
index 4d39264c..1183c2cb 100644
--- a/src/main/java/icu/samnyan/aqua/sega/maimai2/model/userdata/UserEntities.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/maimai2/model/userdata/UserEntities.kt
@@ -3,6 +3,7 @@
 package icu.samnyan.aqua.sega.maimai2.model.userdata
 
 import com.fasterxml.jackson.annotation.JsonIgnore
+import com.fasterxml.jackson.annotation.JsonIgnoreProperties
 import com.fasterxml.jackson.annotation.JsonInclude
 import com.fasterxml.jackson.annotation.JsonProperty
 import com.fasterxml.jackson.core.JsonGenerator
@@ -16,6 +17,8 @@ import icu.samnyan.aqua.net.games.IGenericUserMusic
 import icu.samnyan.aqua.net.games.IUserEntity
 import icu.samnyan.aqua.sega.general.IntegerListConverter
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.time.LocalDate
 import java.time.LocalDateTime
 import java.time.format.DateTimeFormatter
@@ -24,6 +27,7 @@ import java.time.format.DateTimeFormatter
 open class Mai2UserEntity : BaseEntity(), IUserEntity<Mai2UserDetail> {
     @JsonIgnore
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "user_id")
     override var user: Mai2UserDetail = Mai2UserDetail()
 }
@@ -459,6 +463,7 @@ fun main(args: Array<String>) {
 
 @Table(name = "maimai2_user_print_detail")
 @Entity
+@JsonIgnoreProperties(value = ["userCard"], allowSetters = true)
 class Mai2UserPrintDetail : Mai2UserEntity() {
     var orderId: Long = 0
     var printNumber = 0
diff --git a/src/main/java/icu/samnyan/aqua/sega/ongeki/model/OngekiUserEntities.kt b/src/main/java/icu/samnyan/aqua/sega/ongeki/model/OngekiUserEntities.kt
index 47aa146d..d200a5f7 100644
--- a/src/main/java/icu/samnyan/aqua/sega/ongeki/model/OngekiUserEntities.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/ongeki/model/OngekiUserEntities.kt
@@ -7,6 +7,8 @@ import icu.samnyan.aqua.net.games.*
 import icu.samnyan.aqua.sega.general.model.Card
 import icu.samnyan.aqua.sega.util.AccessCodeSerializer
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.time.LocalDate
 import java.time.LocalDateTime
 
@@ -14,6 +16,7 @@ import java.time.LocalDateTime
 class OngekiUserEntity : BaseEntity(), IUserEntity<UserData> {
     @JsonIgnore
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "user_id")
     override var user: UserData = UserData()
 }
@@ -541,4 +544,4 @@ class UserGacha : OngekiUserEntity() {
     var fiveGachaCnt = 0
     var elevenGachaCnt = 0
     var dailyGachaDate: String = LocalDateTime.now().toString()
-}
\ No newline at end of file
+}
diff --git a/src/main/java/icu/samnyan/aqua/sega/wacca/model/db/WaccaUserModels.kt b/src/main/java/icu/samnyan/aqua/sega/wacca/model/db/WaccaUserModels.kt
index 4dc7af80..e26e3339 100644
--- a/src/main/java/icu/samnyan/aqua/sega/wacca/model/db/WaccaUserModels.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/wacca/model/db/WaccaUserModels.kt
@@ -9,6 +9,8 @@ import icu.samnyan.aqua.sega.general.IntegerListConverter
 import icu.samnyan.aqua.sega.wacca.WaccaItemType
 import icu.samnyan.aqua.sega.wacca.WaccaItemType.*
 import jakarta.persistence.*
+import org.hibernate.annotations.OnDelete
+import org.hibernate.annotations.OnDeleteAction
 import java.util.*
 
 typealias UC = UniqueConstraint
@@ -20,6 +22,7 @@ typealias UC = UniqueConstraint
 open class WaccaUserEntity : BaseEntity() {
     @JsonIgnore
     @ManyToOne
+    @OnDelete(action = OnDeleteAction.CASCADE)
     @JoinColumn(name = "user_id")
     open var user: WaccaUser = WaccaUser()
 }
diff --git a/src/main/resources/db/120/V1000_83__diva_user_cascade.sql b/src/main/resources/db/120/V1000_83__diva_user_cascade.sql
new file mode 100644
index 00000000..8ef1b894
--- /dev/null
+++ b/src/main/resources/db/120/V1000_83__diva_user_cascade.sql
@@ -0,0 +1,66 @@
+-- Diva's user foreign keys were removed in V1000.7 and never recreated.
+-- Remove any rows that can no longer be associated with a profile before restoring them.
+DELETE child FROM diva_game_session child
+    LEFT JOIN diva_player_profile profile ON child.pd_id = profile.id
+    WHERE profile.id IS NULL;
+DELETE child FROM diva_play_log child
+    LEFT JOIN diva_player_profile profile ON child.pd_id = profile.id
+    WHERE profile.id IS NULL;
+DELETE child FROM diva_player_contest child
+    LEFT JOIN diva_player_profile profile ON child.pd_id = profile.id
+    WHERE profile.id IS NULL;
+DELETE child FROM diva_player_customize child
+    LEFT JOIN diva_player_profile profile ON child.pd_id = profile.id
+    WHERE profile.id IS NULL;
+DELETE child FROM diva_player_inventory child
+    LEFT JOIN diva_player_profile profile ON child.pd_id = profile.id
+    WHERE profile.id IS NULL;
+DELETE child FROM diva_player_module child
+    LEFT JOIN diva_player_profile profile ON child.pd_id = profile.id
+    WHERE profile.id IS NULL;
+DELETE child FROM diva_player_pv_customize child
+    LEFT JOIN diva_player_profile profile ON child.pd_id = profile.id
+    WHERE profile.id IS NULL;
+DELETE child FROM diva_player_pv_record child
+    LEFT JOIN diva_player_profile profile ON child.pd_id = profile.id
+    WHERE profile.id IS NULL;
+DELETE child FROM diva_player_screen_shot child
+    LEFT JOIN diva_player_profile profile ON child.pd_id = profile.id
+    WHERE profile.id IS NULL;
+
+ALTER TABLE diva_game_session
+    ADD CONSTRAINT fku_diva_game_session_profile
+        FOREIGN KEY (pd_id) REFERENCES diva_player_profile (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE diva_play_log
+    ADD CONSTRAINT fku_diva_play_log_profile
+        FOREIGN KEY (pd_id) REFERENCES diva_player_profile (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE diva_player_contest
+    ADD CONSTRAINT fku_diva_player_contest_profile
+        FOREIGN KEY (pd_id) REFERENCES diva_player_profile (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE diva_player_customize
+    ADD CONSTRAINT fku_diva_player_customize_profile
+        FOREIGN KEY (pd_id) REFERENCES diva_player_profile (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE diva_player_inventory
+    ADD CONSTRAINT fku_diva_player_inventory_profile
+        FOREIGN KEY (pd_id) REFERENCES diva_player_profile (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE diva_player_module
+    ADD CONSTRAINT fku_diva_player_module_profile
+        FOREIGN KEY (pd_id) REFERENCES diva_player_profile (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE diva_player_pv_customize
+    ADD CONSTRAINT fku_diva_player_pv_customize_profile
+        FOREIGN KEY (pd_id) REFERENCES diva_player_profile (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE diva_player_pv_record
+    ADD CONSTRAINT fku_diva_player_pv_record_profile
+        FOREIGN KEY (pd_id) REFERENCES diva_player_profile (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE diva_player_screen_shot
+    ADD CONSTRAINT fku_diva_player_screen_shot_profile
+        FOREIGN KEY (pd_id) REFERENCES diva_player_profile (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
diff --git a/src/main/resources/db/120/V1000_84__account_owned_cascade.sql b/src/main/resources/db/120/V1000_84__account_owned_cascade.sql
new file mode 100644
index 00000000..32add6df
--- /dev/null
+++ b/src/main/resources/db/120/V1000_84__account_owned_cascade.sql
@@ -0,0 +1,42 @@
+-- Account-owned rows disappear with the account. Physical cards are only unlinked.
+ALTER TABLE aqua_net_session
+    DROP FOREIGN KEY IF EXISTS FK_SESSION;
+ALTER TABLE aqua_net_session
+    ADD CONSTRAINT FK_SESSION
+        FOREIGN KEY (au_id) REFERENCES aqua_net_user (au_id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE aqua_net_email_confirmation
+    DROP FOREIGN KEY IF EXISTS FK_EMAIL_CONFIRMATION_ON_AQUA_USER;
+ALTER TABLE aqua_net_email_confirmation
+    ADD CONSTRAINT FK_EMAIL_CONFIRMATION_ON_AQUA_USER
+        FOREIGN KEY (au_id) REFERENCES aqua_net_user (au_id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE aqua_net_email_reset_password
+    DROP FOREIGN KEY IF EXISTS FK_EMAIL_RESET_PASSWORD_ON_AQUA_USER;
+ALTER TABLE aqua_net_email_reset_password
+    ADD CONSTRAINT FK_EMAIL_RESET_PASSWORD_ON_AQUA_USER
+        FOREIGN KEY (au_id) REFERENCES aqua_net_user (au_id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE allnet_keychip_sessions
+    DROP FOREIGN KEY IF EXISTS FK_ALLNET_KEYCHIP_SESSIONS_ON_AU;
+ALTER TABLE allnet_keychip_sessions
+    ADD CONSTRAINT FK_ALLNET_KEYCHIP_SESSIONS_ON_AU
+        FOREIGN KEY (au_id) REFERENCES aqua_net_user (au_id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE user_keychip
+    DROP FOREIGN KEY IF EXISTS fk_user_keychip_on_au;
+ALTER TABLE user_keychip
+    ADD CONSTRAINT fk_user_keychip_on_au
+        FOREIGN KEY (au_id) REFERENCES aqua_net_user (au_id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
+
+ALTER TABLE sega_card
+    DROP FOREIGN KEY IF EXISTS FK_SEGA_CARD_ON_NET_USER;
+ALTER TABLE sega_card
+    ADD CONSTRAINT FK_SEGA_CARD_ON_NET_USER
+        FOREIGN KEY (net_user_id) REFERENCES aqua_net_user (au_id)
+            ON DELETE SET NULL ON UPDATE CASCADE;
diff --git a/src/main/resources/db/120/V1000_85__ongeki_gacha_cascade.sql b/src/main/resources/db/120/V1000_85__ongeki_gacha_cascade.sql
new file mode 100644
index 00000000..3d77ca56
--- /dev/null
+++ b/src/main/resources/db/120/V1000_85__ongeki_gacha_cascade.sql
@@ -0,0 +1,6 @@
+ALTER TABLE ongeki_user_gacha
+    DROP FOREIGN KEY IF EXISTS FK_ONGEKI_USER_GACHA_ON_USER;
+ALTER TABLE ongeki_user_gacha
+    ADD CONSTRAINT FK_ONGEKI_USER_GACHA_ON_USER
+        FOREIGN KEY (user_id) REFERENCES ongeki_user_data (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
diff --git a/src/main/resources/db/120/V1000_86__maimai2_print_detail_cascade.sql b/src/main/resources/db/120/V1000_86__maimai2_print_detail_cascade.sql
new file mode 100644
index 00000000..e89890f6
--- /dev/null
+++ b/src/main/resources/db/120/V1000_86__maimai2_print_detail_cascade.sql
@@ -0,0 +1,11 @@
+-- V1000.7 accidentally replaced the user foreign key with a second user-card
+-- foreign key. Restore the direct ownership link so every print detail is
+-- removed with its Mai2 user, including legacy rows without a user card.
+DELETE detail FROM maimai2_user_print_detail detail
+    LEFT JOIN maimai2_user_detail user_data ON detail.user_id = user_data.id
+    WHERE user_data.id IS NULL;
+
+ALTER TABLE maimai2_user_print_detail
+    ADD CONSTRAINT fku_maimai2_user_print_detail_user
+        FOREIGN KEY (user_id) REFERENCES maimai2_user_detail (id)
+            ON DELETE CASCADE ON UPDATE CASCADE;
diff --git a/src/test/kotlin/test/Mai2UserPrintDetailJsonTest.kt b/src/test/kotlin/test/Mai2UserPrintDetailJsonTest.kt
new file mode 100644
index 00000000..b08e258f
--- /dev/null
+++ b/src/test/kotlin/test/Mai2UserPrintDetailJsonTest.kt
@@ -0,0 +1,23 @@
+package test
+
+import ext.JACKSON
+import icu.samnyan.aqua.sega.maimai2.model.userdata.Mai2UserCard
+import icu.samnyan.aqua.sega.maimai2.model.userdata.Mai2UserPrintDetail
+import io.kotest.core.spec.style.StringSpec
+import io.kotest.matchers.shouldBe
+
+class Mai2UserPrintDetailJsonTest : StringSpec({
+    "userCard is accepted on input but omitted from output" {
+        val detail = Mai2UserPrintDetail().apply {
+            userCard = Mai2UserCard().apply { cardId = 42 }
+        }
+
+        JACKSON.writeValueAsString(detail).contains("\"userCard\"") shouldBe false
+
+        val imported = JACKSON.readValue(
+            """{"userCard":{"cardId":42}}""",
+            Mai2UserPrintDetail::class.java,
+        )
+        imported.userCard?.cardId shouldBe 42
+    }
+})