diff --git a/backend/services/admin-service/prisma/migrations/20251227100000_add_system_maintenance_and_co_managed_wallet/migration.sql b/backend/services/admin-service/prisma/migrations/20251227100000_add_system_maintenance_and_co_managed_wallet/migration.sql
new file mode 100644
index 00000000..49f123aa
--- /dev/null
+++ b/backend/services/admin-service/prisma/migrations/20251227100000_add_system_maintenance_and_co_managed_wallet/migration.sql
@@ -0,0 +1,85 @@
+-- =============================================================================
+-- System Maintenance & Co-Managed Wallet Migration
+-- 系统维护公告 + 共管钱包系统
+-- =============================================================================
+
+-- -----------------------------------------------------------------------------
+-- 1. 系统维护公告表
+-- -----------------------------------------------------------------------------
+
+CREATE TABLE "system_maintenances" (
+    "id" TEXT NOT NULL,
+    "title" VARCHAR(100) NOT NULL,
+    "message" TEXT NOT NULL,
+    "start_time" TIMESTAMP(3) NOT NULL,
+    "end_time" TIMESTAMP(3) NOT NULL,
+    "is_active" BOOLEAN NOT NULL DEFAULT false,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+    "created_by" TEXT NOT NULL,
+    "updated_by" TEXT,
+
+    CONSTRAINT "system_maintenances_pkey" PRIMARY KEY ("id")
+);
+
+CREATE INDEX "system_maintenances_is_active_idx" ON "system_maintenances"("is_active");
+CREATE INDEX "system_maintenances_start_time_end_time_idx" ON "system_maintenances"("start_time", "end_time");
+
+-- -----------------------------------------------------------------------------
+-- 2. 共管钱包会话状态枚举
+-- -----------------------------------------------------------------------------
+
+CREATE TYPE "WalletSessionStatus" AS ENUM ('WAITING', 'READY', 'PROCESSING', 'COMPLETED', 'FAILED', 'CANCELLED');
+
+-- -----------------------------------------------------------------------------
+-- 3. 共管钱包会话表
+-- -----------------------------------------------------------------------------
+
+CREATE TABLE "co_managed_wallet_sessions" (
+    "id" TEXT NOT NULL,
+    "wallet_name" VARCHAR(100) NOT NULL,
+    "threshold_t" INTEGER NOT NULL,
+    "threshold_n" INTEGER NOT NULL,
+    "invite_code" VARCHAR(20) NOT NULL,
+    "status" "WalletSessionStatus" NOT NULL DEFAULT 'WAITING',
+    "participants" TEXT NOT NULL,
+    "current_round" INTEGER NOT NULL DEFAULT 0,
+    "total_rounds" INTEGER NOT NULL DEFAULT 3,
+    "public_key" VARCHAR(200),
+    "error" TEXT,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL,
+    "created_by" VARCHAR(100) NOT NULL,
+
+    CONSTRAINT "co_managed_wallet_sessions_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX "co_managed_wallet_sessions_invite_code_key" ON "co_managed_wallet_sessions"("invite_code");
+CREATE INDEX "co_managed_wallet_sessions_invite_code_idx" ON "co_managed_wallet_sessions"("invite_code");
+CREATE INDEX "co_managed_wallet_sessions_status_idx" ON "co_managed_wallet_sessions"("status");
+CREATE INDEX "co_managed_wallet_sessions_created_by_idx" ON "co_managed_wallet_sessions"("created_by");
+CREATE INDEX "co_managed_wallet_sessions_created_at_idx" ON "co_managed_wallet_sessions"("created_at");
+
+-- -----------------------------------------------------------------------------
+-- 4. 共管钱包表
+-- -----------------------------------------------------------------------------
+
+CREATE TABLE "co_managed_wallets" (
+    "id" TEXT NOT NULL,
+    "session_id" TEXT NOT NULL,
+    "name" VARCHAR(100) NOT NULL,
+    "public_key" VARCHAR(200) NOT NULL,
+    "threshold_t" INTEGER NOT NULL,
+    "threshold_n" INTEGER NOT NULL,
+    "participants" TEXT NOT NULL,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "created_by" VARCHAR(100) NOT NULL,
+
+    CONSTRAINT "co_managed_wallets_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX "co_managed_wallets_session_id_key" ON "co_managed_wallets"("session_id");
+CREATE INDEX "co_managed_wallets_session_id_idx" ON "co_managed_wallets"("session_id");
+CREATE INDEX "co_managed_wallets_public_key_idx" ON "co_managed_wallets"("public_key");
+CREATE INDEX "co_managed_wallets_created_by_idx" ON "co_managed_wallets"("created_by");
+CREATE INDEX "co_managed_wallets_created_at_idx" ON "co_managed_wallets"("created_at");