diff --git a/backend/services/mining-admin-service/prisma/migrations/20260113000000_remove_cdc_foreign_keys/migration.sql b/backend/services/mining-admin-service/prisma/migrations/20260113000000_remove_cdc_foreign_keys/migration.sql
new file mode 100644
index 00000000..209cce74
--- /dev/null
+++ b/backend/services/mining-admin-service/prisma/migrations/20260113000000_remove_cdc_foreign_keys/migration.sql
@@ -0,0 +1,21 @@
+-- =============================================================================
+-- 移除 CDC 同步表的外键约束
+-- 原因：CDC 事件异步到达，顺序不可控，子表记录可能在父表记录之前到达
+-- 参考：https://estuary.dev/blog/cdc-done-correctly/
+-- =============================================================================
+
+-- 移除 synced_contribution_accounts 表的外键约束
+ALTER TABLE "synced_contribution_accounts"
+DROP CONSTRAINT IF EXISTS "synced_contribution_accounts_accountSequence_fkey";
+
+-- 移除 synced_referrals 表的外键约束
+ALTER TABLE "synced_referrals"
+DROP CONSTRAINT IF EXISTS "synced_referrals_accountSequence_fkey";
+
+-- 移除 synced_mining_accounts 表的外键约束
+ALTER TABLE "synced_mining_accounts"
+DROP CONSTRAINT IF EXISTS "synced_mining_accounts_accountSequence_fkey";
+
+-- 移除 synced_trading_accounts 表的外键约束
+ALTER TABLE "synced_trading_accounts"
+DROP CONSTRAINT IF EXISTS "synced_trading_accounts_accountSequence_fkey";
diff --git a/backend/services/mining-admin-service/prisma/schema.prisma b/backend/services/mining-admin-service/prisma/schema.prisma
index 563ed3de..d0c0a3fe 100644
--- a/backend/services/mining-admin-service/prisma/schema.prisma
+++ b/backend/services/mining-admin-service/prisma/schema.prisma
@@ -163,11 +163,8 @@ model SyncedUser {
   syncedAt          DateTime @default(now())
   updatedAt         DateTime @updatedAt
 
-  // 关联同步表
-  contributionAccount SyncedContributionAccount?
-  miningAccount       SyncedMiningAccount?
-  tradingAccount      SyncedTradingAccount?
-  referral            SyncedReferral?
+  // CDC 同步表不设置外键约束，因为事件到达顺序不可控
+  // 使用 accountSequence 作为逻辑关联键，查询时用 LEFT JOIN
 
   @@index([phone])
   @@index([status])
@@ -182,7 +179,7 @@ model SyncedUser {
 
 model SyncedContributionAccount {
   id                      String   @id @default(uuid())
-  accountSequence         String   @unique
+  accountSequence         String   @unique  // 逻辑关联 SyncedUser.accountSequence，无外键约束
   personalContribution    Decimal  @db.Decimal(30, 8) @default(0)
   teamLevelContribution   Decimal  @db.Decimal(30, 8) @default(0)
   teamBonusContribution   Decimal  @db.Decimal(30, 8) @default(0)
@@ -195,8 +192,6 @@ model SyncedContributionAccount {
   syncedAt                DateTime @default(now())
   updatedAt               DateTime @updatedAt
 
-  user                    SyncedUser @relation(fields: [accountSequence], references: [accountSequence])
-
   @@map("synced_contribution_accounts")
 }
 
@@ -206,7 +201,7 @@ model SyncedContributionAccount {
 
 model SyncedReferral {
   id                      String   @id @default(uuid())
-  accountSequence         String   @unique
+  accountSequence         String   @unique  // 逻辑关联 SyncedUser.accountSequence，无外键约束
   referrerAccountSequence String?  // 推荐人账户序列号
   referrerUserId          BigInt?  // 1.0 的 referrer_id
   originalUserId          BigInt?  // 1.0 的 user_id
@@ -215,8 +210,6 @@ model SyncedReferral {
   syncedAt                DateTime @default(now())
   updatedAt               DateTime @updatedAt
 
-  user                    SyncedUser @relation(fields: [accountSequence], references: [accountSequence])
-
   @@index([referrerAccountSequence])
   @@index([depth])
   @@map("synced_referrals")
@@ -308,7 +301,7 @@ model SyncedNetworkProgress {
 
 model SyncedMiningAccount {
   id                String   @id @default(uuid())
-  accountSequence   String   @unique
+  accountSequence   String   @unique  // 逻辑关联 SyncedUser.accountSequence，无外键约束
   totalMined        Decimal  @db.Decimal(30, 8) @default(0)
   availableBalance  Decimal  @db.Decimal(30, 8) @default(0)
   frozenBalance     Decimal  @db.Decimal(30, 8) @default(0)
@@ -316,8 +309,6 @@ model SyncedMiningAccount {
   syncedAt          DateTime @default(now())
   updatedAt         DateTime @updatedAt
 
-  user              SyncedUser @relation(fields: [accountSequence], references: [accountSequence])
-
   @@map("synced_mining_accounts")
 }
 
@@ -327,7 +318,7 @@ model SyncedMiningAccount {
 
 model SyncedTradingAccount {
   id              String   @id @default(uuid())
-  accountSequence String   @unique
+  accountSequence String   @unique  // 逻辑关联 SyncedUser.accountSequence，无外键约束
   shareBalance    Decimal  @db.Decimal(30, 8) @default(0)
   cashBalance     Decimal  @db.Decimal(30, 8) @default(0)
   frozenShares    Decimal  @db.Decimal(30, 8) @default(0)
@@ -337,8 +328,6 @@ model SyncedTradingAccount {
   syncedAt        DateTime @default(now())
   updatedAt       DateTime @updatedAt
 
-  user            SyncedUser @relation(fields: [accountSequence], references: [accountSequence])
-
   @@map("synced_trading_accounts")
 }