DB에 동시적으로 접근하더라도 데이터 무결성이 깨지지 않도록 DB 접근 코드 수정

src/lib/server/db/error.ts

@@ -0,0 +1,21 @@
+type IntegrityErrorMessages =
+  // Client
+  | "Public key(s) already registered"
+  | "User client already exists"
+  // File
+  | "Directory not found"
+  | "File not found"
+  | "Invalid DEK version"
+  // MEK
+  | "MEK already registered"
+  | "Inactive MEK version"
+  // Token
+  | "Refresh token not found"
+  | "Refresh token already registered";
+
+export class IntegrityError extends Error {
+  constructor(public message: IntegrityErrorMessages) {
+    super(message);
+    this.name = "IntegrityError";
+  }
+}