이미지 최적화 작업 큐 추가

중복 이미지 해시 재사용 추가
업로드 이미지 WebP 최적화 1차 적용
2026-03-31 17:44:03 +09:00 · 2026-03-31 17:39:54 +09:00 · 2026-03-31 17:33:52 +09:00 · 2026-03-31 17:13:28 +09:00 · 2026-03-31 17:07:21 +09:00 · 2026-03-31 16:52:17 +09:00
15 changed files with 1478 additions and 228 deletions
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -17,12 +17,488 @@
        "mysql2": "^3.20.0",
        "nanoid": "^5.1.7",
        "session-file-store": "^1.5.0",
+        "sharp": "^0.34.5",
        "zod": "^4.3.6"
      },
      "devDependencies": {
        "nodemon": "^3.1.14"
      }
    },
+    "node_modules/@emnapi/runtime": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.9.1.tgz",
+      "integrity": "sha512-VYi5+ZVLhpgK4hQ0TAjiQiZ6ol0oe4mBx7mVv7IflsiEp0OWoVsp/+f9Vc1hOhE0TtkORVrI1GvzyreqpgWtkA==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
+    "node_modules/@img/colour": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@img/colour/-/colour-1.1.0.tgz",
+      "integrity": "sha512-Td76q7j57o/tLVdgS746cYARfSyxk8iEfRxewL9h4OMzYhbW4TAcppl0mT4eyqXddh6L/jwoM75mo7ixa/pCeQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@img/sharp-darwin-arm64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-darwin-arm64/-/sharp-darwin-arm64-0.34.5.tgz",
+      "integrity": "sha512-imtQ3WMJXbMY4fxb/Ndp6HBTNVtWCUI0WdobyheGf5+ad6xX8VIDO8u2xE4qc/fr08CKG/7dDseFtn6M6g/r3w==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-darwin-arm64": "1.2.4"
+      }
+    },
+    "node_modules/@img/sharp-darwin-x64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-darwin-x64/-/sharp-darwin-x64-0.34.5.tgz",
+      "integrity": "sha512-YNEFAF/4KQ/PeW0N+r+aVVsoIY0/qxxikF2SWdp+NRkmMB7y9LBZAVqQ4yhGCm/H3H270OSykqmQMKLBhBJDEw==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-darwin-x64": "1.2.4"
+      }
+    },
+    "node_modules/@img/sharp-libvips-darwin-arm64": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-darwin-arm64/-/sharp-libvips-darwin-arm64-1.2.4.tgz",
+      "integrity": "sha512-zqjjo7RatFfFoP0MkQ51jfuFZBnVE2pRiaydKJ1G/rHZvnsrHAOcQALIi9sA5co5xenQdTugCvtb1cuf78Vf4g==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-libvips-darwin-x64": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-darwin-x64/-/sharp-libvips-darwin-x64-1.2.4.tgz",
+      "integrity": "sha512-1IOd5xfVhlGwX+zXv2N93k0yMONvUlANylbJw1eTah8K/Jtpi15KC+WSiaX/nBmbm2HxRM1gZ0nSdjSsrZbGKg==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-libvips-linux-arm": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-arm/-/sharp-libvips-linux-arm-1.2.4.tgz",
+      "integrity": "sha512-bFI7xcKFELdiNCVov8e44Ia4u2byA+l3XtsAj+Q8tfCwO6BQ8iDojYdvoPMqsKDkuoOo+X6HZA0s0q11ANMQ8A==",
+      "cpu": [
+        "arm"
+      ],
+      "license": "LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-libvips-linux-arm64": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-arm64/-/sharp-libvips-linux-arm64-1.2.4.tgz",
+      "integrity": "sha512-excjX8DfsIcJ10x1Kzr4RcWe1edC9PquDRRPx3YVCvQv+U5p7Yin2s32ftzikXojb1PIFc/9Mt28/y+iRklkrw==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-libvips-linux-ppc64": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-ppc64/-/sharp-libvips-linux-ppc64-1.2.4.tgz",
+      "integrity": "sha512-FMuvGijLDYG6lW+b/UvyilUWu5Ayu+3r2d1S8notiGCIyYU/76eig1UfMmkZ7vwgOrzKzlQbFSuQfgm7GYUPpA==",
+      "cpu": [
+        "ppc64"
+      ],
+      "license": "LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-libvips-linux-riscv64": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-riscv64/-/sharp-libvips-linux-riscv64-1.2.4.tgz",
+      "integrity": "sha512-oVDbcR4zUC0ce82teubSm+x6ETixtKZBh/qbREIOcI3cULzDyb18Sr/Wcyx7NRQeQzOiHTNbZFF1UwPS2scyGA==",
+      "cpu": [
+        "riscv64"
+      ],
+      "license": "LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-libvips-linux-s390x": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-s390x/-/sharp-libvips-linux-s390x-1.2.4.tgz",
+      "integrity": "sha512-qmp9VrzgPgMoGZyPvrQHqk02uyjA0/QrTO26Tqk6l4ZV0MPWIW6LTkqOIov+J1yEu7MbFQaDpwdwJKhbJvuRxQ==",
+      "cpu": [
+        "s390x"
+      ],
+      "license": "LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-libvips-linux-x64": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-x64/-/sharp-libvips-linux-x64-1.2.4.tgz",
+      "integrity": "sha512-tJxiiLsmHc9Ax1bz3oaOYBURTXGIRDODBqhveVHonrHJ9/+k89qbLl0bcJns+e4t4rvaNBxaEZsFtSfAdquPrw==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-libvips-linuxmusl-arm64": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linuxmusl-arm64/-/sharp-libvips-linuxmusl-arm64-1.2.4.tgz",
+      "integrity": "sha512-FVQHuwx1IIuNow9QAbYUzJ+En8KcVm9Lk5+uGUQJHaZmMECZmOlix9HnH7n1TRkXMS0pGxIJokIVB9SuqZGGXw==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-libvips-linuxmusl-x64": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linuxmusl-x64/-/sharp-libvips-linuxmusl-x64-1.2.4.tgz",
+      "integrity": "sha512-+LpyBk7L44ZIXwz/VYfglaX/okxezESc6UxDSoyo2Ks6Jxc4Y7sGjpgU9s4PMgqgjj1gZCylTieNamqA1MF7Dg==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-linux-arm": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linux-arm/-/sharp-linux-arm-0.34.5.tgz",
+      "integrity": "sha512-9dLqsvwtg1uuXBGZKsxem9595+ujv0sJ6Vi8wcTANSFpwV/GONat5eCkzQo/1O6zRIkh0m/8+5BjrRr7jDUSZw==",
+      "cpu": [
+        "arm"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linux-arm": "1.2.4"
+      }
+    },
+    "node_modules/@img/sharp-linux-arm64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linux-arm64/-/sharp-linux-arm64-0.34.5.tgz",
+      "integrity": "sha512-bKQzaJRY/bkPOXyKx5EVup7qkaojECG6NLYswgktOZjaXecSAeCWiZwwiFf3/Y+O1HrauiE3FVsGxFg8c24rZg==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linux-arm64": "1.2.4"
+      }
+    },
+    "node_modules/@img/sharp-linux-ppc64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linux-ppc64/-/sharp-linux-ppc64-0.34.5.tgz",
+      "integrity": "sha512-7zznwNaqW6YtsfrGGDA6BRkISKAAE1Jo0QdpNYXNMHu2+0dTrPflTLNkpc8l7MUP5M16ZJcUvysVWWrMefZquA==",
+      "cpu": [
+        "ppc64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linux-ppc64": "1.2.4"
+      }
+    },
+    "node_modules/@img/sharp-linux-riscv64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linux-riscv64/-/sharp-linux-riscv64-0.34.5.tgz",
+      "integrity": "sha512-51gJuLPTKa7piYPaVs8GmByo7/U7/7TZOq+cnXJIHZKavIRHAP77e3N2HEl3dgiqdD/w0yUfiJnII77PuDDFdw==",
+      "cpu": [
+        "riscv64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linux-riscv64": "1.2.4"
+      }
+    },
+    "node_modules/@img/sharp-linux-s390x": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linux-s390x/-/sharp-linux-s390x-0.34.5.tgz",
+      "integrity": "sha512-nQtCk0PdKfho3eC5MrbQoigJ2gd1CgddUMkabUj+rBevs8tZ2cULOx46E7oyX+04WGfABgIwmMC0VqieTiR4jg==",
+      "cpu": [
+        "s390x"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linux-s390x": "1.2.4"
+      }
+    },
+    "node_modules/@img/sharp-linux-x64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linux-x64/-/sharp-linux-x64-0.34.5.tgz",
+      "integrity": "sha512-MEzd8HPKxVxVenwAa+JRPwEC7QFjoPWuS5NZnBt6B3pu7EG2Ge0id1oLHZpPJdn3OQK+BQDiw9zStiHBTJQQQQ==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linux-x64": "1.2.4"
+      }
+    },
+    "node_modules/@img/sharp-linuxmusl-arm64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linuxmusl-arm64/-/sharp-linuxmusl-arm64-0.34.5.tgz",
+      "integrity": "sha512-fprJR6GtRsMt6Kyfq44IsChVZeGN97gTD331weR1ex1c1rypDEABN6Tm2xa1wE6lYb5DdEnk03NZPqA7Id21yg==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linuxmusl-arm64": "1.2.4"
+      }
+    },
+    "node_modules/@img/sharp-linuxmusl-x64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linuxmusl-x64/-/sharp-linuxmusl-x64-0.34.5.tgz",
+      "integrity": "sha512-Jg8wNT1MUzIvhBFxViqrEhWDGzqymo3sV7z7ZsaWbZNDLXRJZoRGrjulp60YYtV4wfY8VIKcWidjojlLcWrd8Q==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linuxmusl-x64": "1.2.4"
+      }
+    },
+    "node_modules/@img/sharp-wasm32": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-wasm32/-/sharp-wasm32-0.34.5.tgz",
+      "integrity": "sha512-OdWTEiVkY2PHwqkbBI8frFxQQFekHaSSkUIJkwzclWZe64O1X4UlUjqqqLaPbUpMOQk6FBu/HtlGXNblIs0huw==",
+      "cpu": [
+        "wasm32"
+      ],
+      "license": "Apache-2.0 AND LGPL-3.0-or-later AND MIT",
+      "optional": true,
+      "dependencies": {
+        "@emnapi/runtime": "^1.7.0"
+      },
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-win32-arm64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-win32-arm64/-/sharp-win32-arm64-0.34.5.tgz",
+      "integrity": "sha512-WQ3AgWCWYSb2yt+IG8mnC6Jdk9Whs7O0gxphblsLvdhSpSTtmu69ZG1Gkb6NuvxsNACwiPV6cNSZNzt0KPsw7g==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "Apache-2.0 AND LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-win32-ia32": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-win32-ia32/-/sharp-win32-ia32-0.34.5.tgz",
+      "integrity": "sha512-FV9m/7NmeCmSHDD5j4+4pNI8Cp3aW+JvLoXcTUo0IqyjSfAZJ8dIUmijx1qaJsIiU+Hosw6xM5KijAWRJCSgNg==",
+      "cpu": [
+        "ia32"
+      ],
+      "license": "Apache-2.0 AND LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
+    "node_modules/@img/sharp-win32-x64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-win32-x64/-/sharp-win32-x64-0.34.5.tgz",
+      "integrity": "sha512-+29YMsqY2/9eFEiW93eqWnuLcWcufowXewwSNIT6UwZdUUCrM3oFjMWH/Z6/TMmb4hlFenmfAVbpWeup2jryCw==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "Apache-2.0 AND LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
    "node_modules/@types/node": {
      "version": "25.5.0",
      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.5.0.tgz",
@@ -368,6 +844,15 @@
        "node": ">= 0.8"
      }
    },
+    "node_modules/detect-libc": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/detect-libc/-/detect-libc-2.1.2.tgz",
+      "integrity": "sha512-Btj2BOOO83o3WyH59e8MgXsxEQVcarkUOpEYrubB0urwnN10yQ364rsiByU11nZlqWYZm05i/of7io4mzihBtQ==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=8"
+      }
+    },
    "node_modules/dunder-proto": {
      "version": "1.0.1",
      "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",
@@ -1381,7 +1866,6 @@
      "version": "7.7.4",
      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
      "integrity": "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==",
-      "dev": true,
      "license": "ISC",
      "bin": {
        "semver": "bin/semver.js"
@@ -1458,6 +1942,50 @@
      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw==",
      "license": "ISC"
    },
+    "node_modules/sharp": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.34.5.tgz",
+      "integrity": "sha512-Ou9I5Ft9WNcCbXrU9cMgPBcCK8LiwLqcbywW3t4oDV37n1pzpuNLsYiAV8eODnjbtQlSDwZ2cUEeQz4E54Hltg==",
+      "hasInstallScript": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@img/colour": "^1.0.0",
+        "detect-libc": "^2.1.2",
+        "semver": "^7.7.3"
+      },
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-darwin-arm64": "0.34.5",
+        "@img/sharp-darwin-x64": "0.34.5",
+        "@img/sharp-libvips-darwin-arm64": "1.2.4",
+        "@img/sharp-libvips-darwin-x64": "1.2.4",
+        "@img/sharp-libvips-linux-arm": "1.2.4",
+        "@img/sharp-libvips-linux-arm64": "1.2.4",
+        "@img/sharp-libvips-linux-ppc64": "1.2.4",
+        "@img/sharp-libvips-linux-riscv64": "1.2.4",
+        "@img/sharp-libvips-linux-s390x": "1.2.4",
+        "@img/sharp-libvips-linux-x64": "1.2.4",
+        "@img/sharp-libvips-linuxmusl-arm64": "1.2.4",
+        "@img/sharp-libvips-linuxmusl-x64": "1.2.4",
+        "@img/sharp-linux-arm": "0.34.5",
+        "@img/sharp-linux-arm64": "0.34.5",
+        "@img/sharp-linux-ppc64": "0.34.5",
+        "@img/sharp-linux-riscv64": "0.34.5",
+        "@img/sharp-linux-s390x": "0.34.5",
+        "@img/sharp-linux-x64": "0.34.5",
+        "@img/sharp-linuxmusl-arm64": "0.34.5",
+        "@img/sharp-linuxmusl-x64": "0.34.5",
+        "@img/sharp-wasm32": "0.34.5",
+        "@img/sharp-win32-arm64": "0.34.5",
+        "@img/sharp-win32-ia32": "0.34.5",
+        "@img/sharp-win32-x64": "0.34.5"
+      }
+    },
    "node_modules/side-channel": {
      "version": "1.1.0",
      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz",
@@ -1635,6 +2163,13 @@
        "nodetouch": "bin/nodetouch.js"
      }
    },
+    "node_modules/tslib": {
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+      "license": "0BSD",
+      "optional": true
+    },
    "node_modules/type-is": {
      "version": "2.0.1",
      "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",
--- a/backend/package.json
+++ b/backend/package.json
@@ -20,6 +20,7 @@
    "mysql2": "^3.20.0",
    "nanoid": "^5.1.7",
    "session-file-store": "^1.5.0",
+    "sharp": "^0.34.5",
    "zod": "^4.3.6"
  },
  "devDependencies": {
--- a/backend/src/db.js
+++ b/backend/src/db.js
@@ -64,6 +64,37 @@ function mapGameItemRow(row) {
  }
 }

+function mapImageAssetRow(row) {
+  if (!row) return null
+  return {
+    id: row.id,
+    contentHash: row.content_hash,
+    src: row.src || '',
+    mimeType: row.mime_type || 'image/webp',
+    byteSize: Number(row.byte_size || 0),
+    originalByteSize: Number(row.original_byte_size || 0),
+    width: Number(row.width || 0),
+    height: Number(row.height || 0),
+    createdAt: Number(row.created_at || 0),
+  }
+}
+
+function mapImageOptimizationJobRow(row) {
+  if (!row) return null
+  return {
+    id: row.id,
+    status: row.status,
+    sourceCategory: row.source_category || '',
+    targetDirectory: row.target_directory || '',
+    originalByteSize: Number(row.original_byte_size || 0),
+    optimizedByteSize: Number(row.optimized_byte_size || 0),
+    reusedAsset: !!row.reused_asset,
+    errorMessage: row.error_message || '',
+    queuedAt: Number(row.queued_at || 0),
+    startedAt: Number(row.started_at || 0),
+    finishedAt: Number(row.finished_at || 0),
+  }
+}
 function mapTierListRow(row) {
  if (!row) return null
  return {
@@ -79,6 +110,9 @@ function mapTierListRow(row) {
    description: row.description || '',
    isPublic: !!row.is_public,
    showCharacterNames: !!row.show_character_names,
+    sourceTierListId: row.source_tierlist_id || '',
+    sourceSnapshotTitle: row.source_snapshot_title || '',
+    sourceSnapshotAuthor: row.source_snapshot_author || '',
    groups: parseJson(row.groups_json, []),
    pool: parseJson(row.pool_json, []),
    createdAt: Number(row.created_at),
@@ -228,6 +262,9 @@ async function ensureSchema() {
        description TEXT NOT NULL,
        is_public TINYINT(1) NOT NULL DEFAULT 0,
        show_character_names TINYINT(1) NOT NULL DEFAULT 0,
+        source_tierlist_id VARCHAR(64) NULL DEFAULT NULL,
+        source_snapshot_title VARCHAR(120) NOT NULL DEFAULT '',
+        source_snapshot_author VARCHAR(120) NOT NULL DEFAULT '',
        groups_json LONGTEXT NOT NULL,
        pool_json LONGTEXT NOT NULL,
        created_at BIGINT NOT NULL,
@@ -264,6 +301,38 @@ async function ensureSchema() {
      ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
    `)

+    await query(`
+      CREATE TABLE IF NOT EXISTS image_assets (
+        id VARCHAR(64) PRIMARY KEY,
+        content_hash CHAR(64) NOT NULL UNIQUE,
+        src VARCHAR(255) NOT NULL UNIQUE,
+        mime_type VARCHAR(32) NOT NULL DEFAULT 'image/webp',
+        byte_size INT UNSIGNED NOT NULL,
+        original_byte_size INT UNSIGNED NOT NULL,
+        width INT UNSIGNED NOT NULL DEFAULT 0,
+        height INT UNSIGNED NOT NULL DEFAULT 0,
+        created_at BIGINT NOT NULL,
+        INDEX idx_image_assets_created_at (created_at)
+      ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
+    `)
+
+    await query(`
+      CREATE TABLE IF NOT EXISTS image_optimization_jobs (
+        id VARCHAR(64) PRIMARY KEY,
+        status VARCHAR(20) NOT NULL DEFAULT 'queued',
+        source_category VARCHAR(40) NOT NULL DEFAULT '',
+        target_directory VARCHAR(40) NOT NULL DEFAULT '',
+        original_byte_size INT UNSIGNED NOT NULL DEFAULT 0,
+        optimized_byte_size INT UNSIGNED NOT NULL DEFAULT 0,
+        reused_asset TINYINT(1) NOT NULL DEFAULT 0,
+        error_message VARCHAR(255) NOT NULL DEFAULT '',
+        queued_at BIGINT NOT NULL,
+        started_at BIGINT NOT NULL DEFAULT 0,
+        finished_at BIGINT NOT NULL DEFAULT 0,
+        INDEX idx_image_optimization_jobs_status_queued (status, queued_at),
+        INDEX idx_image_optimization_jobs_finished_at (finished_at)
+      ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
+    `)
    await query(`
      CREATE TABLE IF NOT EXISTS template_requests (
        id VARCHAR(64) PRIMARY KEY,
@@ -295,6 +364,18 @@ async function ensureSchema() {
    if (!tierListShowNamesColumns.length) {
      await query("ALTER TABLE tierlists ADD COLUMN show_character_names TINYINT(1) NOT NULL DEFAULT 0 AFTER is_public")
    }
+    const tierListSourceIdColumns = await query("SHOW COLUMNS FROM tierlists LIKE 'source_tierlist_id'")
+    if (!tierListSourceIdColumns.length) {
+      await query("ALTER TABLE tierlists ADD COLUMN source_tierlist_id VARCHAR(64) NULL DEFAULT NULL AFTER show_character_names")
+    }
+    const tierListSourceTitleColumns = await query("SHOW COLUMNS FROM tierlists LIKE 'source_snapshot_title'")
+    if (!tierListSourceTitleColumns.length) {
+      await query("ALTER TABLE tierlists ADD COLUMN source_snapshot_title VARCHAR(120) NOT NULL DEFAULT '' AFTER source_tierlist_id")
+    }
+    const tierListSourceAuthorColumns = await query("SHOW COLUMNS FROM tierlists LIKE 'source_snapshot_author'")
+    if (!tierListSourceAuthorColumns.length) {
+      await query("ALTER TABLE tierlists ADD COLUMN source_snapshot_author VARCHAR(120) NOT NULL DEFAULT '' AFTER source_snapshot_title")
+    }

    await query(
      `
@@ -504,6 +585,65 @@ async function updateGameThumbnail(gameId, thumbnailSrc) {
  return findGameById(gameId)
 }

+async function findImageAssetByHash(contentHash) {
+  const rows = await query(
+    'SELECT id, content_hash, src, mime_type, byte_size, original_byte_size, width, height, created_at FROM image_assets WHERE content_hash = ? LIMIT 1',
+    [contentHash]
+  )
+  return mapImageAssetRow(rows[0])
+}
+
+async function createImageAsset({ id, contentHash, src, mimeType = "image/webp", byteSize, originalByteSize, width, height }) {
+  const createdAt = now()
+  await query(
+    'INSERT INTO image_assets (id, content_hash, src, mime_type, byte_size, original_byte_size, width, height, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)',
+    [id, contentHash, src, mimeType, byteSize, originalByteSize, width, height, createdAt]
+  )
+  return findImageAssetByHash(contentHash)
+}
+
+async function createImageOptimizationJob({ id, sourceCategory, targetDirectory, originalByteSize }) {
+  const queuedAt = now()
+  await query(
+    'INSERT INTO image_optimization_jobs (id, status, source_category, target_directory, original_byte_size, optimized_byte_size, reused_asset, error_message, queued_at, started_at, finished_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)',
+    [id, 'queued', sourceCategory || '', targetDirectory || '', originalByteSize || 0, 0, 0, '', queuedAt, 0, 0]
+  )
+  return findImageOptimizationJobById(id)
+}
+
+async function findImageOptimizationJobById(id) {
+  const rows = await query(
+    'SELECT id, status, source_category, target_directory, original_byte_size, optimized_byte_size, reused_asset, error_message, queued_at, started_at, finished_at FROM image_optimization_jobs WHERE id = ? LIMIT 1',
+    [id]
+  )
+  return mapImageOptimizationJobRow(rows[0])
+}
+
+async function updateImageOptimizationJobStatus({ id, status, optimizedByteSize = 0, reusedAsset = false, errorMessage = '', startedAt, finishedAt }) {
+  const fields = ['status = ?', 'optimized_byte_size = ?', 'reused_asset = ?', 'error_message = ?']
+  const params = [status, optimizedByteSize, reusedAsset ? 1 : 0, errorMessage.slice(0, 255)]
+
+  if (typeof startedAt === 'number') {
+    fields.push('started_at = ?')
+    params.push(startedAt)
+  }
+  if (typeof finishedAt === 'number') {
+    fields.push('finished_at = ?')
+    params.push(finishedAt)
+  }
+
+  params.push(id)
+  await query(`UPDATE image_optimization_jobs SET ${fields.join(', ')} WHERE id = ?`, params)
+  return findImageOptimizationJobById(id)
+}
+
+async function listRecentImageOptimizationJobs(limit = 20) {
+  const safeLimit = Math.max(1, Math.min(100, Number(limit) || 20))
+  const rows = await query(
+    `SELECT id, status, source_category, target_directory, original_byte_size, optimized_byte_size, reused_asset, error_message, queued_at, started_at, finished_at FROM image_optimization_jobs ORDER BY queued_at DESC LIMIT ${safeLimit}`
+  )
+  return rows.map(mapImageOptimizationJobRow)
+}
 async function createGameItem({ id, gameId, src, label }) {
  const createdAt = now()
  await query('INSERT INTO game_items (id, game_id, src, label, created_at) VALUES (?, ?, ?, ?, ?)', [
@@ -894,6 +1034,9 @@ async function listFavoriteTierLists(userId, { queryText = '', sort = 'favorited
        t.description,
        t.is_public,
        t.show_character_names,
+        t.source_tierlist_id,
+        t.source_snapshot_title,
+        t.source_snapshot_author,
        t.groups_json,
        t.pool_json,
        t.created_at,
@@ -1024,6 +1167,9 @@ async function listAdminTierLists({ queryText = '', page = 1, limit = 50, curren
        t.description,
        t.is_public,
        t.show_character_names,
+        t.source_tierlist_id,
+        t.source_snapshot_title,
+        t.source_snapshot_author,
        t.groups_json,
        t.pool_json,
        t.created_at,
@@ -1080,6 +1226,9 @@ async function findTierListById(id, currentUserId = '') {
        t.description,
        t.is_public,
        t.show_character_names,
+        t.source_tierlist_id,
+        t.source_snapshot_title,
+        t.source_snapshot_author,
        t.groups_json,
        t.pool_json,
        t.created_at,
@@ -1277,7 +1426,21 @@ async function deleteCustomItems(ids) {
  await query(`DELETE FROM custom_items WHERE id IN (${placeholders})`, ids)
 }

-async function saveTierList({ id, authorId, gameId, title, thumbnailSrc = '', description, isPublic, showCharacterNames = false, groups, pool }) {
+async function saveTierList({
+  id,
+  authorId,
+  gameId,
+  title,
+  thumbnailSrc = '',
+  description,
+  isPublic,
+  showCharacterNames = false,
+  sourceTierListId = '',
+  sourceSnapshotTitle = '',
+  sourceSnapshotAuthor = '',
+  groups,
+  pool,
+}) {
  const existing = id ? await findTierListById(id, authorId) : null
  await syncOwnedCustomItemLabels({ ownerId: authorId, items: pool })
  const nextThumbnailSrc = (thumbnailSrc || '').trim() || getAutoThumbnailSrc(groups, pool)
@@ -1286,10 +1449,10 @@ async function saveTierList({ id, authorId, gameId, title, thumbnailSrc = '', de
    await query(
      `
        UPDATE tierlists
-        SET title = ?, thumbnail_src = ?, description = ?, is_public = ?, show_character_names = ?, groups_json = ?, pool_json = ?, updated_at = ?
+        SET title = ?, thumbnail_src = ?, description = ?, is_public = ?, show_character_names = ?, source_tierlist_id = ?, source_snapshot_title = ?, source_snapshot_author = ?, groups_json = ?, pool_json = ?, updated_at = ?
        WHERE id = ?
      `,
-      [title, nextThumbnailSrc, description || '', isPublic ? 1 : 0, showCharacterNames ? 1 : 0, serializeJson(groups), serializeJson(pool), now(), existing.id]
+      [title, nextThumbnailSrc, description || '', isPublic ? 1 : 0, showCharacterNames ? 1 : 0, sourceTierListId || null, sourceSnapshotTitle || '', sourceSnapshotAuthor || '', serializeJson(groups), serializeJson(pool), now(), existing.id]
    )
    return findTierListById(existing.id, authorId)
  }
@@ -1298,15 +1461,37 @@ async function saveTierList({ id, authorId, gameId, title, thumbnailSrc = '', de
  await query(
    `
      INSERT INTO tierlists (
-        id, author_id, game_id, title, thumbnail_src, description, is_public, show_character_names, groups_json, pool_json, created_at, updated_at
+        id, author_id, game_id, title, thumbnail_src, description, is_public, show_character_names, source_tierlist_id, source_snapshot_title, source_snapshot_author, groups_json, pool_json, created_at, updated_at
      )
-      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
+      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    `,
-    [id, authorId, gameId, title, nextThumbnailSrc, description || '', isPublic ? 1 : 0, showCharacterNames ? 1 : 0, serializeJson(groups), serializeJson(pool), createdAt, createdAt]
+    [id, authorId, gameId, title, nextThumbnailSrc, description || '', isPublic ? 1 : 0, showCharacterNames ? 1 : 0, sourceTierListId || null, sourceSnapshotTitle || '', sourceSnapshotAuthor || '', serializeJson(groups), serializeJson(pool), createdAt, createdAt]
  )
  return findTierListById(id, authorId)
 }

+async function duplicateTierListForUser({ tierList, targetUserId }) {
+  const { nanoid } = require('nanoid')
+  const duplicateId = nanoid()
+  const baseTitle = (tierList.title || '티어표').trim() || '티어표'
+  const copyTitle = baseTitle.endsWith(' 복사본') ? baseTitle : `${baseTitle} 복사본`
+  return saveTierList({
+    id: duplicateId,
+    authorId: targetUserId,
+    gameId: tierList.gameId,
+    title: copyTitle,
+    thumbnailSrc: tierList.thumbnailSrc || '',
+    description: tierList.description || '',
+    isPublic: false,
+    showCharacterNames: !!tierList.showCharacterNames,
+    sourceTierListId: tierList.id,
+    sourceSnapshotTitle: tierList.title || '',
+    sourceSnapshotAuthor: tierList.authorName || tierList.authorAccountName || '',
+    groups: JSON.parse(JSON.stringify(tierList.groups || [])),
+    pool: JSON.parse(JSON.stringify(tierList.pool || [])),
+  })
+}
+
 async function favoriteTierList({ userId, tierListId }) {
  await query('INSERT IGNORE INTO favorite_tierlists (user_id, tierlist_id, created_at) VALUES (?, ?, ?)', [userId, tierListId, now()])
 }
@@ -1341,6 +1526,12 @@ module.exports = {
  getGameDetail,
  createGame,
  updateGameThumbnail,
+  findImageAssetByHash,
+  createImageAsset,
+  createImageOptimizationJob,
+  findImageOptimizationJobById,
+  updateImageOptimizationJobStatus,
+  listRecentImageOptimizationJobs,
  createGameItem,
  updateGameItemLabel,
  deleteGameItem,
@@ -1363,6 +1554,7 @@ module.exports = {
  findCustomItemsByIds,
  deleteCustomItems,
  saveTierList,
+  duplicateTierListForUser,
  createTemplateRequest,
  findTemplateRequestById,
  listAdminTemplateRequests,
--- a/backend/src/lib/image-storage.js
+++ b/backend/src/lib/image-storage.js
@@ -0,0 +1,218 @@
+const fs = require('fs/promises')
+const path = require('path')
+const crypto = require('crypto')
+const sharp = require('sharp')
+const { nanoid } = require('nanoid')
+const {
+  findImageAssetByHash,
+  createImageAsset,
+  createImageOptimizationJob,
+  updateImageOptimizationJobStatus,
+} = require('../db')
+
+const UPLOAD_ROOT = path.join(__dirname, '..', '..', 'uploads')
+const OPTIMIZED_DIR = 'assets'
+const OPTIMIZATION_CONCURRENCY = Math.max(1, Number(process.env.IMAGE_OPTIMIZATION_CONCURRENCY || 1))
+
+let activeCount = 0
+const pendingJobs = []
+
+function ensureImageMimeType(file) {
+  return typeof file?.mimetype === 'string' && file.mimetype.startsWith('image/')
+}
+
+function createMemoryUpload(multer, { fileSize = 6 * 1024 * 1024, maxCount } = {}) {
+  return multer({
+    storage: multer.memoryStorage(),
+    limits: {
+      fileSize,
+      ...(typeof maxCount === 'number' ? { files: maxCount } : {}),
+    },
+    fileFilter: (req, file, cb) => {
+      if (ensureImageMimeType(file)) return cb(null, true)
+      cb(new Error('image_file_required'))
+    },
+  })
+}
+
+function scheduleQueue() {
+  while (activeCount < OPTIMIZATION_CONCURRENCY && pendingJobs.length) {
+    const job = pendingJobs.shift()
+    activeCount += 1
+    processQueuedJob(job)
+      .then(job.resolve)
+      .catch(job.reject)
+      .finally(() => {
+        activeCount = Math.max(0, activeCount - 1)
+        scheduleQueue()
+      })
+  }
+}
+
+async function optimizeAndPersist({ file, width, height, fit, quality }) {
+  const { data, info } = await sharp(file.buffer, { failOn: 'none' })
+    .rotate()
+    .resize({
+      width,
+      height,
+      fit,
+      withoutEnlargement: true,
+    })
+    .webp({ quality })
+    .toBuffer({ resolveWithObject: true })
+
+  const contentHash = crypto.createHash('sha256').update(data).digest('hex')
+  const existing = await findImageAssetByHash(contentHash)
+  if (existing) {
+    return {
+      src: existing.src,
+      size: existing.byteSize,
+      originalSize: existing.originalByteSize,
+      width: existing.width,
+      height: existing.height,
+      contentHash: existing.contentHash,
+      reused: true,
+    }
+  }
+
+  const filename = String(Date.now()) + '-' + nanoid() + '.webp'
+  const absoluteDir = path.join(UPLOAD_ROOT, OPTIMIZED_DIR)
+  const absolutePath = path.join(absoluteDir, filename)
+  const src = '/uploads/' + OPTIMIZED_DIR + '/' + filename
+
+  await fs.mkdir(absoluteDir, { recursive: true })
+  await fs.writeFile(absolutePath, data)
+
+  try {
+    const asset = await createImageAsset({
+      id: nanoid(),
+      contentHash,
+      src,
+      mimeType: 'image/webp',
+      byteSize: data.length,
+      originalByteSize: file.size || file.buffer.length,
+      width: info.width || 0,
+      height: info.height || 0,
+    })
+
+    return {
+      src: asset.src,
+      size: asset.byteSize,
+      originalSize: asset.originalByteSize,
+      width: asset.width,
+      height: asset.height,
+      contentHash: asset.contentHash,
+      reused: false,
+    }
+  } catch (error) {
+    try {
+      await fs.unlink(absolutePath)
+    } catch (unlinkError) {
+      if (unlinkError?.code !== 'ENOENT') throw unlinkError
+    }
+
+    if (error?.code === 'ER_DUP_ENTRY') {
+      const asset = await findImageAssetByHash(contentHash)
+      if (asset) {
+        return {
+          src: asset.src,
+          size: asset.byteSize,
+          originalSize: asset.originalByteSize,
+          width: asset.width,
+          height: asset.height,
+          contentHash: asset.contentHash,
+          reused: true,
+        }
+      }
+    }
+
+    throw error
+  }
+}
+
+async function processQueuedJob(job) {
+  await updateImageOptimizationJobStatus({
+    id: job.jobId,
+    status: 'processing',
+    startedAt: Date.now(),
+  })
+
+  try {
+    const result = await optimizeAndPersist(job)
+    await updateImageOptimizationJobStatus({
+      id: job.jobId,
+      status: 'completed',
+      optimizedByteSize: result.size,
+      reusedAsset: result.reused,
+      finishedAt: Date.now(),
+    })
+    return result
+  } catch (error) {
+    await updateImageOptimizationJobStatus({
+      id: job.jobId,
+      status: 'failed',
+      errorMessage: error?.message || 'optimization_failed',
+      finishedAt: Date.now(),
+    })
+    throw error
+  }
+}
+
+async function writeOptimizedImage({
+  file,
+  directory,
+  width,
+  height,
+  fit = 'inside',
+  quality = 82,
+}) {
+  if (!file?.buffer?.length) {
+    const error = new Error('file_required')
+    error.code = 'file_required'
+    throw error
+  }
+
+  if (!ensureImageMimeType(file)) {
+    const error = new Error('image_file_required')
+    error.code = 'image_file_required'
+    throw error
+  }
+
+  const jobId = nanoid()
+  await createImageOptimizationJob({
+    id: jobId,
+    sourceCategory: directory,
+    targetDirectory: OPTIMIZED_DIR,
+    originalByteSize: file.size || file.buffer.length,
+  })
+
+  return new Promise((resolve, reject) => {
+    pendingJobs.push({
+      jobId,
+      file,
+      directory,
+      width,
+      height,
+      fit,
+      quality,
+      resolve: (result) => resolve({ ...result, directory }),
+      reject,
+    })
+    scheduleQueue()
+  })
+}
+
+function getImageOptimizationQueueState() {
+  return {
+    concurrency: OPTIMIZATION_CONCURRENCY,
+    activeCount,
+    pendingCount: pendingJobs.length,
+  }
+}
+
+module.exports = {
+  createMemoryUpload,
+  ensureImageMimeType,
+  writeOptimizedImage,
+  getImageOptimizationQueueState,
+}
--- a/backend/src/routes/admin.js
+++ b/backend/src/routes/admin.js
@@ -32,6 +32,7 @@ const {
  adminDeleteUser,
 } = require('../db')
 const { requireAdmin } = require('../middleware/auth')
+const { createMemoryUpload, writeOptimizedImage } = require('../lib/image-storage')

 const router = express.Router()

@@ -53,21 +54,8 @@ function buildItemLabelFromFilename(file) {
  return normalized || 'item'
 }

-const upload = multer({
-  storage: multer.diskStorage({
-    destination: (req, file, cb) => cb(null, path.join(__dirname, '..', '..', 'uploads', 'games')),
-    filename: (req, file, cb) => cb(null, buildUploadFilename(file)),
-  }),
-  limits: { fileSize: 6 * 1024 * 1024 },
-})
-
-const avatarUpload = multer({
-  storage: multer.diskStorage({
-    destination: (req, file, cb) => cb(null, path.join(__dirname, '..', '..', 'uploads', 'avatars')),
-    filename: (req, file, cb) => cb(null, buildUploadFilename(file)),
-  }),
-  limits: { fileSize: 3 * 1024 * 1024 },
-})
+const upload = createMemoryUpload(multer, { fileSize: 8 * 1024 * 1024, maxCount: 50 })
+const avatarUpload = createMemoryUpload(multer, { fileSize: 4 * 1024 * 1024 })

 router.post('/games', requireAdmin, async (req, res) => {
  const schema = z.object({ id: z.string().min(1), name: z.string().min(1).max(60) })
@@ -97,7 +85,17 @@ router.post('/games/:gameId/thumbnail', requireAdmin, upload.single('thumbnail')
  if (!req.file) return res.status(400).json({ error: 'file_required' })
  const game = await findGameById(req.params.gameId)
  if (!game) return res.status(404).json({ error: 'not_found' })
-  const updated = await updateGameThumbnail(req.params.gameId, `/uploads/games/${req.file.filename}`)
+
+  const optimized = await writeOptimizedImage({
+    file: req.file,
+    directory: 'games',
+    width: 1280,
+    height: 1280,
+    fit: 'inside',
+    quality: 84,
+  })
+
+  const updated = await updateGameThumbnail(req.params.gameId, optimized.src)
  res.json({ game: updated })
 })

@@ -107,18 +105,29 @@ router.post('/games/:gameId/images', requireAdmin, upload.array('images', 50), a
  const game = await findGameById(req.params.gameId)
  if (!game) return res.status(404).json({ error: 'not_found' })

-  const manualLabel = typeof req.body?.label === 'string' ? req.body.label.trim() : ''
-  if (manualLabel && manualLabel.length > 60) return res.status(400).json({ error: 'bad_request' })
+  const labelsRaw = req.body?.labels
+  const labels = Array.isArray(labelsRaw) ? labelsRaw : labelsRaw ? [labelsRaw] : []
+  const normalizedLabels = labels.map((label) => (typeof label === 'string' ? label.trim().slice(0, 60) : ''))
+  if (normalizedLabels.some((label) => label.length > 60)) return res.status(400).json({ error: 'bad_request' })

  const items = await Promise.all(
-    files.map((file, index) =>
-      createGameItem({
+    files.map(async (file, index) => {
+      const optimized = await writeOptimizedImage({
+        file,
+        directory: 'games',
+        width: 512,
+        height: 512,
+        fit: 'inside',
+        quality: 84,
+      })
+
+      return createGameItem({
        id: nanoid(),
        gameId: game.id,
-        src: `/uploads/games/${file.filename}`,
-        label: index === 0 && manualLabel ? manualLabel : buildItemLabelFromFilename(file),
+        src: optimized.src,
+        label: normalizedLabels[index] || buildItemLabelFromFilename(file),
      })
-    )
+    })
  )

  res.json({ item: items[0], items })
@@ -512,8 +521,18 @@ router.post('/users/:userId/avatar', requireAdmin, avatarUpload.single('avatar')
  const user = await findUserById(req.params.userId)
  if (!user) return res.status(404).json({ error: 'not_found' })

+  const optimized = req.file
+    ? await writeOptimizedImage({
+        file: req.file,
+        directory: 'avatars',
+        width: 512,
+        height: 512,
+        fit: 'cover',
+        quality: 82,
+      })
+    : null
  const shouldRemoveAvatar = parsed.data.removeAvatar === '1'
-  const nextAvatarSrc = shouldRemoveAvatar ? '' : req.file ? `/uploads/avatars/${req.file.filename}` : user.avatarSrc || ''
+  const nextAvatarSrc = shouldRemoveAvatar ? '' : optimized?.src || user.avatarSrc || ''
  const updated = await adminUpdateUser({
    id: user.id,
    email: user.email,
--- a/backend/src/routes/auth.js
+++ b/backend/src/routes/auth.js
@@ -1,5 +1,4 @@
 const express = require('express')
-const path = require('path')
 const bcrypt = require('bcryptjs')
 const { z } = require('zod')
 const { nanoid } = require('nanoid')
@@ -12,15 +11,10 @@ const {
  updateUserProfile,
 } = require('../db')
 const { requireAuth } = require('../middleware/auth')
+const { createMemoryUpload, writeOptimizedImage } = require('../lib/image-storage')

 const router = express.Router()

-function buildUploadFilename(file) {
-  const ext = path.extname(file.originalname || '').toLowerCase()
-  const safeExt = ext && /^[.a-z0-9]+$/.test(ext) ? ext : ''
-  return `${Date.now()}-${nanoid()}${safeExt}`
-}
-
 const signupSchema = z.object({
  email: z.string().email(),
  password: z.string().min(6),
@@ -45,7 +39,6 @@ router.post('/signup', async (req, res) => {

  req.session.userId = user.id
  req.session.isAdmin = !!user.isAdmin
-  // 세션을 응답 전에 명시적으로 저장해 Set-Cookie가 확실히 내려오도록 보강
  req.session.save((err) => {
    if (err) return res.status(500).json({ error: 'session_save_failed' })
    res.json(user)
@@ -94,13 +87,7 @@ router.get('/meta', async (req, res) => {
  res.json({ hasUsers: (await countUsers()) > 0 })
 })

-const upload = multer({
-  storage: multer.diskStorage({
-    destination: (req, file, cb) => cb(null, path.join(__dirname, '..', '..', 'uploads', 'avatars')),
-    filename: (req, file, cb) => cb(null, buildUploadFilename(file)),
-  }),
-  limits: { fileSize: 3 * 1024 * 1024 },
-})
+const upload = createMemoryUpload(multer, { fileSize: 4 * 1024 * 1024 })

 router.post('/profile', requireAuth, upload.single('avatar'), async (req, res) => {
  const parsed = profileSchema.safeParse(req.body)
@@ -109,12 +96,19 @@ router.post('/profile', requireAuth, upload.single('avatar'), async (req, res) =
  const user = await findUserById(req.session.userId)
  if (!user) return res.status(404).json({ error: 'not_found' })

+  const optimized = req.file
+    ? await writeOptimizedImage({
+        file: req.file,
+        directory: 'avatars',
+        width: 512,
+        height: 512,
+        fit: 'cover',
+        quality: 82,
+      })
+    : null
+
  const shouldRemoveAvatar = parsed.data.removeAvatar === '1'
-  const nextAvatarSrc = shouldRemoveAvatar
-    ? ''
-    : req.file
-      ? `/uploads/avatars/${req.file.filename}`
-      : user.avatarSrc || ''
+  const nextAvatarSrc = shouldRemoveAvatar ? '' : optimized?.src || user.avatarSrc || ''
  const updated = await updateUserProfile({
    id: user.id,
    nickname: parsed.data.nickname,
--- a/backend/src/routes/tierlists.js
+++ b/backend/src/routes/tierlists.js
@@ -1,5 +1,4 @@
 const express = require('express')
-const path = require('path')
 const multer = require('multer')
 const { z } = require('zod')
 const { nanoid } = require('nanoid')
@@ -15,8 +14,10 @@ const {
  findUserById,
  favoriteTierList,
  unfavoriteTierList,
+  duplicateTierListForUser,
 } = require('../db')
 const { requireAuth } = require('../middleware/auth')
+const { createMemoryUpload, writeOptimizedImage } = require('../lib/image-storage')

 const router = express.Router()
 const FREEFORM_GAME_ID = 'freeform'
@@ -54,27 +55,8 @@ function getCustomTemplateItems(tierList) {
  })
 }

-function buildUploadFilename(file) {
-  const ext = path.extname(file.originalname || '').toLowerCase()
-  const safeExt = ext && /^[.a-z0-9]+$/.test(ext) ? ext : ''
-  return `${Date.now()}-${nanoid()}${safeExt}`
-}
-
-const upload = multer({
-  storage: multer.diskStorage({
-    destination: (req, file, cb) => cb(null, path.join(__dirname, '..', '..', 'uploads', 'custom')),
-    filename: (req, file, cb) => cb(null, buildUploadFilename(file)),
-  }),
-  limits: { fileSize: 6 * 1024 * 1024 },
-})
-
-const thumbnailUpload = multer({
-  storage: multer.diskStorage({
-    destination: (req, file, cb) => cb(null, path.join(__dirname, '..', '..', 'uploads', 'tierlists')),
-    filename: (req, file, cb) => cb(null, buildUploadFilename(file)),
-  }),
-  limits: { fileSize: 6 * 1024 * 1024 },
-})
+const upload = createMemoryUpload(multer, { fileSize: 6 * 1024 * 1024 })
+const thumbnailUpload = createMemoryUpload(multer, { fileSize: 8 * 1024 * 1024 })

 const tierListUpsertSchema = z.object({
  id: z.string().optional(),
@@ -84,6 +66,9 @@ const tierListUpsertSchema = z.object({
  description: z.string().max(1000).optional().default(''),
  isPublic: z.boolean().default(false),
  showCharacterNames: z.boolean().optional().default(false),
+  sourceTierListId: z.string().max(64).optional().default(''),
+  sourceSnapshotTitle: z.string().max(120).optional().default(''),
+  sourceSnapshotAuthor: z.string().max(120).optional().default(''),
  groups: z.array(
    z.object({
      id: z.string().min(1),
@@ -131,6 +116,15 @@ router.get('/:id', async (req, res) => {
  res.json({ tierList: normalizeTierList(t) })
 })

+router.post('/:id/duplicate', requireAuth, async (req, res) => {
+  const tierList = await findTierListById(req.params.id, req.session.userId)
+  if (!tierList) return res.status(404).json({ error: 'not_found' })
+  if (!tierList.isPublic && tierList.authorId !== req.session.userId) return res.status(403).json({ error: 'forbidden' })
+
+  const duplicated = await duplicateTierListForUser({ tierList, targetUserId: req.session.userId })
+  res.json({ tierList: normalizeTierList(duplicated) })
+})
+
 router.delete('/:id', requireAuth, async (req, res) => {
  const tierList = await findTierListById(req.params.id, req.session.userId)
  if (!tierList) return res.status(404).json({ error: 'not_found' })
@@ -166,10 +160,19 @@ router.post('/custom-items', requireAuth, upload.single('image'), async (req, re
  const parsed = schema.safeParse(req.body)
  if (!parsed.success) return res.status(400).json({ error: 'bad_request' })

+  const optimized = await writeOptimizedImage({
+    file: req.file,
+    directory: 'custom',
+    width: 512,
+    height: 512,
+    fit: 'inside',
+    quality: 84,
+  })
+
  const item = await createCustomItem({
    id: nanoid(),
    ownerId: req.session.userId,
-    src: `/uploads/custom/${req.file.filename}`,
+    src: optimized.src,
    label: parsed.data.label,
  })

@@ -178,7 +181,17 @@ router.post('/custom-items', requireAuth, upload.single('image'), async (req, re

 router.post('/thumbnail', requireAuth, thumbnailUpload.single('thumbnail'), async (req, res) => {
  if (!req.file) return res.status(400).json({ error: 'file_required' })
-  res.json({ thumbnailSrc: `/uploads/tierlists/${req.file.filename}` })
+
+  const optimized = await writeOptimizedImage({
+    file: req.file,
+    directory: 'tierlists',
+    width: 1280,
+    height: 1280,
+    fit: 'inside',
+    quality: 84,
+  })
+
+  res.json({ thumbnailSrc: optimized.src })
 })

 router.post('/:id/template-request', requireAuth, async (req, res) => {
@@ -245,6 +258,9 @@ router.post('/', requireAuth, async (req, res) => {
      description: payload.description || '',
      isPublic: !!payload.isPublic,
      showCharacterNames: !!payload.showCharacterNames,
+      sourceTierListId: payload.sourceTierListId || existing.sourceTierListId || '',
+      sourceSnapshotTitle: payload.sourceSnapshotTitle || existing.sourceSnapshotTitle || '',
+      sourceSnapshotAuthor: payload.sourceSnapshotAuthor || existing.sourceSnapshotAuthor || '',
      groups: payload.groups,
      pool: normalizedPool,
    })
@@ -260,6 +276,9 @@ router.post('/', requireAuth, async (req, res) => {
    description: payload.description || '',
    isPublic: !!payload.isPublic,
    showCharacterNames: !!payload.showCharacterNames,
+    sourceTierListId: payload.sourceTierListId || '',
+    sourceSnapshotTitle: payload.sourceSnapshotTitle || '',
+    sourceSnapshotAuthor: payload.sourceSnapshotAuthor || '',
    groups: payload.groups,
    pool: normalizedPool,
  })
--- a/docs/update.md
+++ b/docs/update.md
@@ -1,5 +1,55 @@
 # 업데이트 로그

+## 2026-03-31 v1.3.2
+- 업로드 최적화는 이제 백엔드 내부 대기열을 통해 처리되어, 다수 이미지가 한 번에 들어와도 설정된 동시성 안에서 순차적으로 안정적으로 변환되도록 정리함.
+- `image_optimization_jobs` 작업 기록 테이블을 추가해 queued/processing/completed/failed 상태와 원본·최적화 용량, 재사용 여부, 시작/종료 시각을 저장하도록 확장함.
+- 현재 라우트 응답 방식은 유지하면서도 내부적으로는 큐를 타도록 구조를 바꿔, 이후 관리자 대시보드와 작업 통계 화면을 바로 얹을 수 있는 기반을 마련함.
+
+## 2026-03-31 v1.3.1
+- 최적화된 WebP 결과물 기준으로 SHA-256 해시를 계산해, 같은 이미지가 다시 업로드되면 새 파일을 저장하지 않고 기존 자산을 재사용하도록 중복 이미지 해시 검사를 추가함.
+- 이미지 자산 메타데이터를 저장하는 `image_assets` 테이블을 도입해 파일 경로, 해시, 원본 대비 최적화 용량, 해상도를 함께 기록하도록 확장함.
+- 중복 업로드 경쟁 상황에서도 고유 해시 충돌을 안전하게 처리하고, 새 파일 저장에 실패하면 즉시 정리하도록 업로드 헬퍼를 보강함.
+
+## 2026-03-31 v1.3.0
+- 백엔드 업로드 파이프라인을 메모리 기반으로 전환하고, 대표 썸네일·게임 썸네일·커스텀 아이템·게임 기본 아이템·아바타를 서버에서 즉시 WebP로 변환해 저장하도록 정리함.
+- 아이템 이미지는 최대 512px 규격으로 리사이즈하고, 티어표/게임 썸네일은 긴 변 기준 1280px 안쪽으로 최적화해 원본 이미지를 별도로 보관하지 않는 흐름으로 전환함.
+- 업로드 최적화 공통 헬퍼를 추가해 앞으로 중복 해시 검사, 비동기 최적화 큐, 용량 통계 대시보드를 같은 경로 위에 확장할 수 있는 기반을 마련함.
+
+## 2026-03-31 v1.2.73
+- 게임 허브 리스트형 보기의 썸네일을 48px 밀도로 축소해 한 줄이 과하게 커 보이던 인상을 줄이고, 더 많은 티어표를 한눈에 볼 수 있게 조정함.
+- 깨진 대표 썸네일은 `img` alt 텍스트가 길게 노출되지 않도록 에러 시 즉시 플레이스홀더로 대체하고, 제목/메타 말줄임을 더 보강해 레이아웃 붕괴를 막음.
+
+## 2026-03-31 v1.2.72
+- 게임 허브 공개 티어표 목록은 카드 폭과 제목/메타 줄 계산을 다시 조정해, 브라우저 폭에 따라 썸네일과 정보가 카드 밖으로 넘치던 레이아웃 깨짐을 보정함.
+- 상단 워크스페이스 헤더에 grid/list 보기 토글을 추가하고, 게임 허브는 그리드 카드형과 가로 리스트형을 즉시 전환해 볼 수 있도록 확장함.
+
+## 2026-03-31 v1.2.71
+- 게임 허브 공개 티어표 카드는 자동 폭 그리드와 2줄 제목/유연한 메타 배치로 보정해, 브라우저 폭이 줄어들어도 썸네일과 텍스트가 카드 밖으로 넘치지 않도록 정리함.
+- 공개 티어표 상세에서는 다른 사용자의 티어표를 복사해 내 작업본으로 가져오는 기능을 추가하고, 복사본에는 원본 제목/작성자 정보를 작은 출처 메모로 남기도록 확장함.
+- 보기 전용 티어표의 미배치 아이템은 더 어둡고 흐리게 표시하고 `미배치` 상태를 붙여, 내 보드처럼 조작 가능한 인상을 줄이도록 보정함.
+
+## 2026-03-31 v1.2.70
+- 관리자 게임 관리의 썸네일 드롭존을 카드 안 카드 구조 대신, 썸네일 전체 위에 하단 오버레이 문구를 얹는 단일 미디어 영역으로 정리함.
+- 게임 관리 본문 상단 안내 패널과 과한 설명 문구를 제거하고, 비선택 상태는 `게임을 선택해 주세요.` 한 줄 중심의 empty 상태로 단순화함.
+- 새 게임 생성 버튼은 게임 선택과 함께 오른쪽 사이드로 옮겨, 게임 관리 흐름을 선택·생성·썸네일 지정까지 한쪽 패널에서 처리하도록 정리함.
+
+## 2026-03-31 v1.2.69
+- 좌우 사이드 축소/확대 시 텍스트를 즉시 `display:none` 처리하던 방식을 줄이고, 폭·투명도 기반 전환으로 바꿔 아이콘이 떨리는 듯한 느낌을 완화함.
+- 관리자 게임 관리는 오른쪽 사이드에서 게임 선택과 썸네일 지정을 담당하도록 재배치하고, 본문은 기본 아이템 추가/이름 입력/목록 관리에 집중하도록 정리함.
+- 게임 기본 아이템 추가는 업로드 직후 각 파일 이름을 바로 수정할 수 있는 draft 입력 행을 넣고, 선택한 이름이 서버에 함께 저장되도록 관리자 업로드 API를 확장함.
+
+## 2026-03-31 v1.2.68
+- 내 티어표 카드 그리드는 각 카드가 화면 전체 너비를 과도하게 먹지 않도록 최대 폭을 제한해, 1~2개만 있을 때도 적당한 카드 크기를 유지하도록 조정함.
+- 새 티어표 기본 그룹은 기존 S/A/B/C/D 5줄 대신 S/A/B/C 4줄로 시작하게 바꾸고, 좌우 사이드 토글 아이콘 버튼은 외곽선과 배경을 제거해 더 가볍게 정리함.
+
+## 2026-03-31 v1.2.67
+- 홈 화면 게임 템플릿 즐겨찾기 버튼 위치 변경은 유지하면서, 즐겨찾기 on/off 시 카드가 즉시 튀지 않고 부드럽게 재정렬되도록 이동/페이드 전환을 추가함.
+- 별 아이콘을 눌렀을 때 카드가 즐겨찾기 우선순위 위치로 자연스럽게 이동해 전체 라이브러리 전환감이 덜 거칠게 보이도록 보정함.
+
+## 2026-03-31 v1.2.66
+- 내 티어표 카드 하단의 큰 삭제 버튼은 제거하고, 삭제는 상세 편집 화면에서만 하도록 흐름을 단순화함.
+- 내 티어표 카드 그리드를 고정 4/3/2열에서 `auto-fit` 기반 최소 폭 카드로 바꾸고, 제목/메타가 좁은 화면에서도 말줄임과 유연한 폭 계산을 유지하도록 보정함.
+
 ## 2026-03-31 v1.2.65
 - 에디터 옵션 토글의 라벨과 스위치 순서를 바꾼 뒤 체크 상태 셀렉터가 끊긴 문제를 보정해, 왼쪽 라벨·오른쪽 스위치 배치에서도 정상 동작하도록 수정함.
 - 왼쪽 사이드 축소 상태 검색은 전용 모달의 기본 스타일이 빠져 있던 문제를 복구해, 다시 중앙 상단 검색 오버레이로 열리도록 정리함.
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -55,6 +55,8 @@ const leftNavItems = computed(() => {
  return items.filter((item) => !item.requiresAuth || auth.user)
 })
 const showRightRailAction = computed(() => false)
+const showGameHubViewToggle = computed(() => route.name === 'gameHub')
+const gameHubViewMode = computed(() => (route.query.view === 'list' ? 'list' : 'grid'))
 const leftBottomPrimaryAction = computed(() => {
  if (route.name === 'home' && auth.user) {
    return { label: '커스텀 티어표 만들기', to: '/editor/freeform/new' }
@@ -242,6 +244,14 @@ function toggleRightRail() {
  }
 }

+function setGameHubViewMode(mode) {
+  if (route.name !== 'gameHub') return
+  const nextQuery = { ...route.query }
+  if (mode === 'list') nextQuery.view = 'list'
+  else delete nextQuery.view
+  router.replace({ path: route.path, query: nextQuery })
+}
+
 function openCollapsedSearch() {
  if (!leftRailCollapsed.value || isMobileLayout.value) return
  isCollapsedSearchOpen.value = true
@@ -353,6 +363,14 @@ function submitGlobalSearch() {
              <span class="workspaceHead__brandSub">by zenn</span>
            </div>
            <div class="workspaceHead__actions">
+              <div v-if="showGameHubViewToggle" class="viewToggle" role="group" aria-label="티어표 보기 방식">
+                <button class="ghostIcon ghostIcon--iconOnly" :class="{ 'ghostIcon--active': gameHubViewMode === 'grid' }" type="button" aria-label="그리드 보기" @click="setGameHubViewMode('grid')">
+                  <img :src="iconGridView" alt="" />
+                </button>
+                <button class="ghostIcon ghostIcon--iconOnly" :class="{ 'ghostIcon--active': gameHubViewMode === 'list' }" type="button" aria-label="리스트 보기" @click="setGameHubViewMode('list')">
+                  <img :src="iconLists" alt="" />
+                </button>
+              </div>
              <button v-if="!rightRailOpen" class="ghostIcon ghostIcon--iconOnly" type="button" aria-label="패널 열기" @click="toggleRightRail">
                <img :src="iconDockToLeft" alt="" />
              </button>
@@ -560,6 +578,9 @@ function submitGlobalSearch() {
  min-width: 32px;
  width: 32px;
  padding: 0;
+  border: 0;
+  background: transparent;
+  box-shadow: none;
 }

 .appUserCard {
@@ -605,7 +626,9 @@ function submitGlobalSearch() {
  min-width: 0;
  display: grid;
  gap: 4px;
-  transition: opacity 180ms ease;
+  max-width: 180px;
+  overflow: hidden;
+  transition: opacity 180ms ease, max-width 220ms ease, transform 220ms ease;
 }

 .appUserCard__name {
@@ -639,12 +662,14 @@ function submitGlobalSearch() {
 .searchStub__input {
  min-width: 0;
  flex: 1;
+  max-width: 100%;
  border: 0;
  background: transparent;
  color: rgba(255, 255, 255, 0.92);
  outline: none;
  font: inherit;
-  transition: opacity 180ms ease, width 180ms ease;
+  overflow: hidden;
+  transition: opacity 180ms ease, max-width 220ms ease, transform 220ms ease;
 }

 .searchStub__input::placeholder {
@@ -688,7 +713,10 @@ function submitGlobalSearch() {

 .leftNav__label {
  min-width: 0;
+  max-width: 140px;
  white-space: nowrap;
+  overflow: hidden;
+  transition: opacity 180ms ease, max-width 220ms ease, transform 220ms ease;
 }

 .leftNav__item--active,
@@ -723,13 +751,15 @@ function submitGlobalSearch() {
 .appShell--leftCollapsed .appUserCard__button,
 .appShell--leftCollapsed .appUserCard__guest {
  justify-content: center;
-  padding: 6px 0;
 }

 .appShell--leftCollapsed .appUserCard__meta,
 .appShell--leftCollapsed .leftNav__label,
 .appShell--leftCollapsed .searchStub__input {
-  display: none;
+  opacity: 0;
+  max-width: 0;
+  transform: translateX(-4px);
+  pointer-events: none;
 }

 .appShell--leftCollapsed .appUserCard__avatar {
@@ -739,11 +769,10 @@ function submitGlobalSearch() {

 .appShell--leftCollapsed .searchStub {
  justify-content: center;
-  padding: 10px 0;
 }

 .appShell--leftCollapsed .searchStub__iconButton {
-  width: 100%;
+  width: auto;
 }

 .appShell--leftCollapsed .leftNav {
@@ -752,7 +781,6 @@ function submitGlobalSearch() {

 .appShell--leftCollapsed .leftNav__item {
  justify-content: center;
-  padding: 11px 0;
 }

 .appShell--leftCollapsed .leftRail__bottom {
@@ -843,6 +871,26 @@ function submitGlobalSearch() {
  flex-wrap: wrap;
 }

+.viewToggle {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 4px;
+  border-radius: 14px;
+  background: rgba(255, 255, 255, 0.04);
+}
+
+.viewToggle .ghostIcon--iconOnly {
+  width: 36px;
+  height: 36px;
+  min-width: 36px;
+  border-radius: 10px;
+}
+
+.ghostIcon--active {
+  background: rgba(255, 255, 255, 0.08);
+}
+
 .workspaceBody {
  min-height: 0;
  padding: 18px 18px 32px;
--- a/frontend/src/lib/api.js
+++ b/frontend/src/lib/api.js
@@ -90,6 +90,7 @@ export const api = {
  favoriteTierList: (id) => request(`/api/tierlists/${encodeURIComponent(id)}/favorite`, { method: 'POST' }),
  unfavoriteTierList: (id) => request(`/api/tierlists/${encodeURIComponent(id)}/favorite`, { method: 'DELETE' }),
  deleteTierList: (id) => request(`/api/tierlists/${encodeURIComponent(id)}`, { method: 'DELETE' }),
+  duplicateTierList: (id) => request(`/api/tierlists/${encodeURIComponent(id)}/duplicate`, { method: 'POST' }),
  requestTierListTemplate: (id, payload) => request(`/api/tierlists/${encodeURIComponent(id)}/template-request`, { method: 'POST', body: payload }),
  saveTierList: (payload) => request('/api/tierlists', { method: 'POST', body: payload }),
  uploadTierListThumbnail: async (file) => {
--- a/frontend/src/views/AdminView.vue
+++ b/frontend/src/views/AdminView.vue
@@ -65,6 +65,7 @@ const newGameId = ref('')
 const newGameName = ref('')

 const uploadFiles = ref([])
+const uploadItemDrafts = ref([])
 const thumbFile = ref(null)
 const itemPreviewUrls = ref([])
 const isItemDragOver = ref(false)
@@ -80,7 +81,7 @@ const gameCreateModalOpen = ref(false)

 const hasSelectedGame = computed(() => !!selectedGame.value?.game?.id)
 const canApplyThumbnail = computed(() => !!thumbFile.value && !!selectedGameId.value)
-const canAddItem = computed(() => uploadFiles.value.length > 0 && !!selectedGameId.value)
+const canAddItem = computed(() => uploadItemDrafts.value.length > 0 && uploadItemDrafts.value.every((item) => !!item.label.trim()) && !!selectedGameId.value)
 const customItemPageCount = computed(() => Math.max(1, Math.ceil(customItemTotal.value / customItemLimit.value)))
 const adminTierListPageCount = computed(() => Math.max(1, Math.ceil(adminTierListTotal.value / adminTierListLimit.value)))
 const featuredGames = computed(() =>
@@ -437,6 +438,7 @@ async function refreshUsers() {

 function resetUploadState() {
  uploadFiles.value = []
+  uploadItemDrafts.value = []
  thumbFile.value = null
  resetFileInput('item')
  resetFileInput('thumb')
@@ -537,8 +539,14 @@ function handleItemFiles(fileList) {
  const files = Array.from(fileList || []).filter((file) => (file.type || '').startsWith('image/'))
  uploadFiles.value = files
  clearPreviewUrl('item')
+  uploadItemDrafts.value = []
  if (!files.length) return
  itemPreviewUrls.value = files.map((file) => URL.createObjectURL(file))
+  uploadItemDrafts.value = files.map((file, index) => ({
+    file,
+    previewUrl: itemPreviewUrls.value[index],
+    label: (file.name || '').replace(/\.[^.]+$/, '').replace(/[_-]+/g, ' ').replace(/\s+/g, ' ').trim().slice(0, 60),
+  }))
  resetFileInput('item')
 }

@@ -548,6 +556,7 @@ function openItemFilePicker() {

 function clearItemFiles() {
  uploadFiles.value = []
+  uploadItemDrafts.value = []
  clearPreviewUrl('item')
  resetFileInput('item')
 }
@@ -602,15 +611,18 @@ async function uploadThumbnail() {

 async function uploadItem() {
  resetMessages()
-  if (!uploadFiles.value.length || !selectedGameId.value) {
+  if (!uploadItemDrafts.value.length || !selectedGameId.value) {
    error.value = '아이템 파일을 선택해주세요.'
    return
  }

  try {
    const fd = new FormData()
-    uploadFiles.value.forEach((file) => fd.append('images', file))
-    const uploadCount = uploadFiles.value.length
+    uploadItemDrafts.value.forEach((entry) => {
+      fd.append('images', entry.file)
+      fd.append('labels', entry.label.trim())
+    })
+    const uploadCount = uploadItemDrafts.value.length
    const res = await fetch(toApiUrl(`/api/admin/games/${encodeURIComponent(selectedGameId.value)}/images`), {
      method: 'POST',
      credentials: 'include',
@@ -1231,29 +1243,6 @@ async function saveFeaturedOrder() {
          </template>

            <template v-else-if="activeTab === 'game-admin'">
-          <div class="panel">
-            <div class="sectionHeader">
-              <div>
-                <div class="panel__title">게임 관리</div>
-                <div class="hint hint--tight">등록된 게임을 선택하면 아래에서 썸네일과 기본 아이템을 바로 수정할 수 있어요.</div>
-              </div>
-              <button class="btn btn--primary" @click="openGameCreateModal">새 게임 생성</button>
-            </div>
-
-            <div class="gameManagerGrid">
-              <section class="adminCard">
-                <div class="section__title">등록된 게임 선택</div>
-                <div class="gameManagerCard__body">
-                  <select :value="selectedGameId" class="select" @change="handleSelectedGameChange">
-                    <option value="">게임을 선택해주세요</option>
-                    <option v-for="game in games" :key="game.id" :value="game.id">{{ game.name }} ({{ game.id }})</option>
-                  </select>
-                  <div class="hint hint--tight">선택하면 아래 상세 영역에서 썸네일과 기본 아이템을 바로 수정할 수 있어요.</div>
-                  <div v-if="selectedGameId && !hasSelectedGame && !isGameLoading" class="hint hint--tight">선택된 게임 ID: {{ selectedGameId }}</div>
-                </div>
-              </section>
-            </div>
-          </div>

          <div v-if="isGameLoading" class="panel panel--empty">
            <div class="emptyState">
@@ -1268,37 +1257,9 @@ async function saveFeaturedOrder() {
                <div class="selectedGame__name">{{ selectedGame.game.name }}</div>
                <div class="selectedGame__id">{{ selectedGame.game.id }}</div>
              </div>
-              <div class="detailHead__actions">
-                <button class="btn btn--danger" @click="removeGame">게임 삭제</button>
-              </div>
            </div>

-            <div class="section section--topGrid">
-              <section class="adminCard">
-                <div class="section__title">썸네일 적용</div>
-                <input ref="thumbFileInput" type="file" accept="image/*" class="srOnlyInput" @change="onThumb" />
-                <button
-                  class="thumbDropZone"
-                  :class="{ 'thumbDropZone--active': isThumbDragOver }"
-                  type="button"
-                  @click="openThumbFilePicker"
-                  @dragenter="onThumbDragEnter"
-                  @dragover="onThumbDragOver"
-                  @dragleave="onThumbDragLeave"
-                  @drop="onThumbDrop"
-                >
-                  <img v-if="displayThumbnailUrl" class="selectedThumb" :src="displayThumbnailUrl" :alt="selectedGame.game.name" />
-                  <div v-else class="selectedThumb selectedThumb--empty">대표 썸네일</div>
-                  <div class="thumbDropZone__copy">
-                    <div class="thumbDropZone__title">클릭하거나 드래그해서 썸네일 추가</div>
-                    <div class="thumbDropZone__desc">다른 업로드 화면처럼 이미지 한 장을 바로 지정할 수 있어요.</div>
-                  </div>
-                </button>
-                <div class="uploadControls">
-                  <button class="btn" :disabled="!canApplyThumbnail" @click="uploadThumbnail">썸네일 적용</button>
-                </div>
-              </section>
-
+            <div class="section">
              <section class="adminCard">
                <div class="section__title">기본 아이템 추가</div>
                <div class="itemComposer">
@@ -1320,18 +1281,24 @@ async function saveFeaturedOrder() {
                      </div>
                    </div>
                    <button class="btn" :disabled="!canAddItem" @click="uploadItem">
-                      아이템 {{ uploadFiles.length || 0 }}개 추가
+                      아이템 {{ uploadItemDrafts.length || 0 }}개 추가
                    </button>
                  </div>
                  <div class="itemPreviewCard">
-                    <div v-if="itemPreviewUrls.length" class="itemPreviewGrid">
-                      <div v-for="(previewUrl, index) in itemPreviewUrls.slice(0, 6)" :key="previewUrl" class="itemPreviewFrame">
-                        <img class="itemPreviewImage" :src="previewUrl" :alt="uploadFiles[index]?.name || 'item preview'" />
+                    <div v-if="uploadItemDrafts.length" class="itemDraftList">
+                      <div v-for="draft in uploadItemDrafts" :key="draft.previewUrl || draft.file.name" class="itemDraftRow">
+                        <div class="itemDraftRow__preview">
+                          <img class="itemPreviewImage" :src="draft.previewUrl" :alt="draft.file.name || 'item preview'" />
+                        </div>
+                        <div class="itemDraftRow__body">
+                          <input v-model="draft.label" class="input input--labelEdit input--dense" maxlength="60" placeholder="아이템 이름" />
+                          <div class="hint hint--tight">{{ draft.file.name }}</div>
+                        </div>
                      </div>
                    </div>
                    <div v-else class="itemPreviewEmpty">선택한 기본 아이템 미리보기가 여기에 표시됩니다.</div>
                    <div class="thumbLabel thumbLabel--preview">
-                      {{ uploadFiles.length ? `선택된 파일 ${uploadFiles.length}개` : '아직 선택된 파일이 없어요.' }}
+                      {{ uploadItemDrafts.length ? `추가 예정 아이템 ${uploadItemDrafts.length}개` : '아직 선택된 파일이 없어요.' }}
                    </div>
                  </div>
                </div>
@@ -1361,10 +1328,7 @@ async function saveFeaturedOrder() {
          </div>
            <div v-else class="panel panel--empty">
              <div class="emptyState">
-                <div class="emptyState__title">게임을 선택하면 상세 관리가 열려요.</div>
-                <div class="emptyState__desc">
-                  위에서 기존 게임을 선택하거나 새 게임을 만든 뒤, 같은 화면에서 바로 썸네일과 기본 아이템을 정리할 수 있어요.
-                </div>
+                <div class="emptyState__title">게임을 선택해 주세요.</div>
                <div v-if="selectedGameId" class="hint hint--tight">선택한 게임을 찾지 못했거나 로딩 중 오류가 발생했어요. 다시 선택해보세요.</div>
              </div>
            </div>
@@ -1764,7 +1728,44 @@ async function saveFeaturedOrder() {
        </div>
      </section>

-      <section v-if="activeTab === 'items'" class="adminSidebar__panel">
+      <section v-if="activeTab === 'game-admin'" class="adminSidebar__panel">
+        <div class="adminSidebar__label">Game</div>
+        <div class="adminSidebar__group">
+          <button class="btn btn--primary" @click="openGameCreateModal">새 게임 생성</button>
+          <select :value="selectedGameId" class="select" @change="handleSelectedGameChange">
+            <option value="">게임을 선택해주세요</option>
+            <option v-for="game in games" :key="game.id" :value="game.id">{{ game.name }} ({{ game.id }})</option>
+          </select>
+          <div v-if="selectedGameId && !hasSelectedGame && !isGameLoading" class="hint hint--tight">선택된 게임 ID: {{ selectedGameId }}</div>
+        </div>
+        <div v-if="hasSelectedGame" class="adminSidebar__group">
+          <div class="selectedGameSidebar__name">{{ selectedGame.game.name }}</div>
+          <div class="selectedGameSidebar__id">{{ selectedGame.game.id }}</div>
+          <input ref="thumbFileInput" type="file" accept="image/*" class="srOnlyInput" @change="onThumb" />
+          <button
+            class="thumbDropZone"
+            :class="{ 'thumbDropZone--active': isThumbDragOver }"
+            type="button"
+            @click="openThumbFilePicker"
+            @dragenter="onThumbDragEnter"
+            @dragover="onThumbDragOver"
+            @dragleave="onThumbDragLeave"
+            @drop="onThumbDrop"
+          >
+            <img v-if="displayThumbnailUrl" class="selectedThumb selectedThumb--sidebar" :src="displayThumbnailUrl" :alt="selectedGame.game.name" />
+            <div v-else class="selectedThumb selectedThumb--empty selectedThumb--sidebar">대표 썸네일</div>
+            <div class="thumbDropZone__copy">
+              <div class="thumbDropZone__title">클릭 or 드래그</div>
+            </div>
+          </button>
+          <div class="adminSidebar__actions adminSidebar__actions--stack">
+            <button class="btn" :disabled="!canApplyThumbnail" @click="uploadThumbnail">썸네일 적용</button>
+            <button class="btn btn--danger" @click="removeGame">게임 삭제</button>
+          </div>
+        </div>
+      </section>
+
+      <section v-else-if="activeTab === 'items'" class="adminSidebar__panel">
        <div class="adminSidebar__label">Filters</div>
        <div class="adminSidebar__group">
          <input v-model="customItemQuery" class="input" placeholder="파일명, 라벨, 업로더 검색" @keydown.enter.prevent="submitCustomItemSearch" />
@@ -1944,6 +1945,9 @@ async function saveFeaturedOrder() {
  display: grid;
  gap: 10px;
 }
+.adminSidebar__actions--stack .btn {
+  width: 100%;
+}
 .adminSidebar__groupTitle {
  font-size: 13px;
  font-weight: 800;
@@ -2174,6 +2178,9 @@ async function saveFeaturedOrder() {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
 }
+.gameManagerGrid--single {
+  grid-template-columns: minmax(0, 1fr);
+}
 .gameManagerCard__body {
  margin-top: 10px;
  display: grid;
@@ -2186,6 +2193,9 @@ async function saveFeaturedOrder() {
  padding: 16px;
  min-width: 0;
 }
+.adminCard--muted {
+  background: rgba(255, 255, 255, 0.02);
+}
 .sectionHeader {
  display: flex;
  gap: 12px;
@@ -2240,6 +2250,11 @@ async function saveFeaturedOrder() {
 .input--labelEdit {
  margin-top: 10px;
 }
+.input--dense {
+  margin-top: 0;
+  padding-top: 9px;
+  padding-bottom: 9px;
+}
 .hint {
  margin-top: 10px;
  opacity: 0.78;
@@ -2351,34 +2366,48 @@ async function saveFeaturedOrder() {
  place-items: center;
  color: rgba(255, 255, 255, 0.62);
 }
-.thumbDropZone {
+.selectedThumb--sidebar {
  width: 100%;
-  display: grid;
-  gap: 14px;
-  justify-items: start;
-  padding: 16px;
+}
+.selectedGameSidebar__name {
+  font-size: 18px;
+  font-weight: 900;
+}
+.selectedGameSidebar__id {
+  font-size: 12px;
+  opacity: 0.68;
+  word-break: break-all;
+}
+.thumbDropZone {
+  position: relative;
+  width: 100%;
+  display: block;
+  padding: 0;
+  overflow: hidden;
  border-radius: 18px;
-  border: 1px dashed rgba(255, 255, 255, 0.18);
+  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
  text-align: left;
-  transition: border-color 0.16s ease, background 0.16s ease, transform 0.16s ease;
+  transition: border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
 }
 .thumbDropZone--active {
  border-color: rgba(96, 165, 250, 0.56);
-  background: rgba(96, 165, 250, 0.08);
+  box-shadow: 0 0 0 1px rgba(96, 165, 250, 0.18);
  transform: translateY(-1px);
 }
 .thumbDropZone__copy {
+  position: absolute;
+  inset: auto 0 0 0;
  display: grid;
-  gap: 6px;
+  place-items: center;
+  min-height: 52px;
+  padding: 12px 16px;
+  background: linear-gradient(180deg, rgba(0, 0, 0, 0) 0%, rgba(6, 9, 16, 0.86) 46%, rgba(6, 9, 16, 0.94) 100%);
 }
 .thumbDropZone__title {
  font-weight: 900;
-}
-.thumbDropZone__desc {
-  color: rgba(255, 255, 255, 0.68);
  font-size: 13px;
-  line-height: 1.5;
+  letter-spacing: 0.01em;
 }
 .itemComposer {
  margin-top: 10px;
@@ -2433,6 +2462,29 @@ async function saveFeaturedOrder() {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
 }
+.itemDraftList {
+  display: grid;
+  gap: 10px;
+}
+.itemDraftRow {
+  display: grid;
+  grid-template-columns: 72px minmax(0, 1fr);
+  gap: 12px;
+  align-items: center;
+}
+.itemDraftRow__preview {
+  width: 72px;
+  height: 72px;
+  overflow: hidden;
+  border-radius: 12px;
+  border: 1px solid rgba(255, 255, 255, 0.12);
+  background: rgba(0, 0, 0, 0.18);
+}
+.itemDraftRow__body {
+  min-width: 0;
+  display: grid;
+  gap: 6px;
+}
 .itemPreviewFrame {
  aspect-ratio: 1 / 1;
  border-radius: 12px;
--- a/frontend/src/views/GameHubView.vue
+++ b/frontend/src/views/GameHubView.vue
@@ -15,6 +15,8 @@ const gameName = ref('')
 const tierLists = ref([])
 const error = ref('')
 const query = ref('')
+const brokenThumbnailIds = ref({})
+const isListView = computed(() => route.query.view === 'list')

 function fmt(ts) {
  return new Date(ts).toLocaleDateString(undefined, {
@@ -37,9 +39,15 @@ function avatarFallbackOf(tierList) {
 }

 function tierListThumbnailUrl(tierList) {
+  if (!tierList?.id || brokenThumbnailIds.value[tierList.id]) return ''
  return tierList.thumbnailSrc ? toApiUrl(tierList.thumbnailSrc) : ''
 }

+function handleThumbnailError(tierListId) {
+  if (!tierListId || brokenThumbnailIds.value[tierListId]) return
+  brokenThumbnailIds.value = { ...brokenThumbnailIds.value, [tierListId]: true }
+}
+
 onMounted(async () => {
  await loadTierLists()
 })
@@ -51,6 +59,7 @@ async function loadTierLists() {
      api.searchPublicTierLists(gameId.value, query.value),
    ])
    gameName.value = gameRes.game?.name || gameId.value
+    brokenThumbnailIds.value = {}
    tierLists.value = listRes.tierLists || []
  } catch (e) {
    error.value = '게임 정보를 불러오지 못했어요.'
@@ -96,11 +105,11 @@ function submitSearch() {
      </div>
    </div>
    <div v-if="tierLists.length === 0" class="empty">아직 공개 티어표가 없어요.</div>
-    <div v-else class="list">
-      <article v-for="t in tierLists" :key="t.id" class="boardCard">
-        <button class="boardCard__body" @click="openTierList(t.id)">
+    <div v-else class="list" :class="{ 'list--table': isListView }">
+      <article v-for="t in tierLists" :key="t.id" class="boardCard" :class="{ 'boardCard--list': isListView }">
+        <button class="boardCard__body" :class="{ 'boardCard__body--list': isListView }" @click="openTierList(t.id)">
          <div class="boardCard__thumbWrap">
-            <img v-if="tierListThumbnailUrl(t)" class="boardCard__thumb" :src="tierListThumbnailUrl(t)" :alt="t.title" />
+            <img v-if="tierListThumbnailUrl(t)" class="boardCard__thumb" :src="tierListThumbnailUrl(t)" alt="" @error="handleThumbnailError(t.id)" />
            <div v-else class="boardCard__thumbPlaceholder">대표 썸네일</div>
          </div>
          <div class="boardCard__head">
@@ -213,10 +222,15 @@ function submitSearch() {
 }
 .list {
  display: grid;
-  grid-template-columns: repeat(4, minmax(0, 1fr));
+  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 18px;
 }
+
+.list--table {
+  grid-template-columns: 1fr;
+}
 .boardCard {
+  min-width: 0;
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(62, 62, 62, 0.82);
@@ -233,6 +247,7 @@ function submitSearch() {
  transform: translateY(-2px);
 }
 .boardCard__body {
+  min-width: 0;
  text-align: left;
  padding: 0;
  border: 0;
@@ -242,12 +257,24 @@ function submitSearch() {
  width: 100%;
  display: grid;
 }
+
+.boardCard__body--list {
+  grid-template-columns: 76px minmax(0, 1fr);
+  align-items: center;
+}
 .boardCard__thumbWrap {
+  min-width: 0;
  width: 100%;
  aspect-ratio: 16 / 9;
  padding: 14px 14px 0;
  box-sizing: border-box;
 }
+
+.boardCard--list .boardCard__thumbWrap {
+  aspect-ratio: auto;
+  height: 100%;
+  padding: 14px 0 14px 14px;
+}
 .boardCard__thumb {
  width: 100%;
  height: 100%;
@@ -255,6 +282,14 @@ function submitSearch() {
  display: block;
  border-radius: 18px;
 }
+
+.boardCard--list .boardCard__thumb,
+.boardCard--list .boardCard__thumbPlaceholder {
+  width: 48px;
+  height: 48px;
+  min-height: 48px;
+  border-radius: 12px;
+}
 .boardCard__thumbPlaceholder {
  width: 100%;
  height: 100%;
@@ -271,21 +306,35 @@ function submitSearch() {
  min-width: 0;
  font-size: 18px;
  line-height: 1.35;
-  white-space: nowrap;
+  display: -webkit-box;
+  -webkit-line-clamp: 2;
+  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
+  word-break: break-word;
 }
 .boardCard__head {
+  min-width: 0;
  padding: 16px 18px 18px;
  display: grid;
-  gap: 6px;
+  gap: 8px;
+}
+
+.boardCard--list .boardCard__head {
+  height: 100%;
+  padding: 14px 16px 14px 0;
+  align-content: center;
 }
 .boardCard__titleRow,
 .boardCard__metaRow {
-  display: flex;
+  min-width: 0;
+  display: grid;
+  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
-  align-items: center;
-  justify-content: space-between;
+}
+
+.boardCard__titleRow {
+  align-items: flex-start;
 }

 .boardCard__metaRow {
@@ -293,11 +342,13 @@ function submitSearch() {
 }
 .boardCard__author {
  min-width: 0;
+  max-width: 100%;
  display: inline-flex;
  gap: 7px;
  align-items: center;
  font-size: 13px;
  opacity: 0.86;
+  overflow: hidden;
 }
 .boardCard__authorName {
  min-width: 0;
@@ -323,28 +374,37 @@ function submitSearch() {
 .boardCard__date,
 .favoriteStat {
  flex: 0 0 auto;
+  min-width: 0;
+  max-width: 100%;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.64);
  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
 }

 .boardCard__date {
  font-size: 10px;
 }
-@media (max-width: 1400px) {
-  .list {
-    grid-template-columns: repeat(3, minmax(0, 1fr));
-  }
-}
-@media (max-width: 1024px) {
-  .list {
-    grid-template-columns: repeat(2, minmax(0, 1fr));
+@media (max-width: 900px) {
+  .boardCard__body--list {
+    grid-template-columns: 1fr;
+  }
+
+  .boardCard--list .boardCard__head {
+    padding: 0 18px 18px;
+  }
+
+  .boardCard--list .boardCard__thumbWrap {
+    padding: 14px 14px 0;
  }
 }
+
@media (max-width: 720px) {
  .list {
    grid-template-columns: 1fr;
  }
+
  .searchBar__input {
    min-width: 0;
    width: 100%;
--- a/frontend/src/views/HomeView.vue
+++ b/frontend/src/views/HomeView.vue
@@ -82,7 +82,7 @@ function thumbUrl(g) {
  </section>

  <div v-if="error" class="error">{{ error }}</div>
-  <section v-if="games.length" class="libraryGrid">
+  <TransitionGroup v-if="games.length" name="libraryCard" tag="section" class="libraryGrid">
    <article v-for="g in games" :key="g.id" class="libraryCard">
      <button
        class="libraryCard__favorite"
@@ -104,7 +104,7 @@ function thumbUrl(g) {
        </div>
      </button>
    </article>
-  </section>
+  </TransitionGroup>
  <div v-else class="libraryEmpty">{{ query ? '검색어에 맞는 게임 템플릿이 없어요.' : '표시할 게임 템플릿이 없어요.' }}</div>
 </template>

@@ -139,6 +139,7 @@ function thumbUrl(g) {
  gap: 12px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  transition: transform 0.16s ease, background 0.16s ease;
+  will-change: transform, opacity;
 }
 .libraryCard:hover {
  background: rgba(70, 70, 70, 0.96);
@@ -156,8 +157,8 @@ function thumbUrl(g) {
 }
 .libraryCard__favorite {
  position: absolute;
-  top: 12px;
-  right: 12px;
+  bottom: 24px;
+  right: 14px;
  width: 34px;
  height: 34px;
  border-radius: 999px;
@@ -206,6 +207,24 @@ function thumbUrl(g) {
  overflow: hidden;
  text-overflow: ellipsis;
 }
+.libraryCard-move,
+.libraryCard-enter-active,
+.libraryCard-leave-active {
+  transition: transform 280ms ease, opacity 220ms ease;
+}
+
+.libraryCard-enter-from,
+.libraryCard-leave-to {
+  opacity: 0;
+  transform: translateY(10px) scale(0.985);
+}
+
+.libraryCard-leave-active {
+  position: absolute;
+  width: calc(100% - 0px);
+  pointer-events: none;
+}
+
 .libraryEmpty {
  padding: 20px 0;
  color: rgba(255, 255, 255, 0.62);
--- a/frontend/src/views/MyTierListsView.vue
+++ b/frontend/src/views/MyTierListsView.vue
@@ -54,18 +54,6 @@ function openList(t) {
  router.push(`/editor/${t.gameId}/${t.id}`)
 }

-async function removeList(t) {
-  error.value = ''
-  try {
-    const ok = window.confirm(`"${t.title}" 티어표를 삭제할까요?`)
-    if (!ok) return
-    await api.deleteTierList(t.id)
-    myLists.value = myLists.value.filter((entry) => entry.id !== t.id)
-    toast.success('티어표를 삭제했어요.')
-  } catch (e) {
-    error.value = '티어표 삭제에 실패했어요.'
-  }
-}
 </script>

 <template>
@@ -101,7 +89,6 @@ async function removeList(t) {
              </div>
            </div>
          </button>
-          <button class="link link--danger" @click="removeList(t)">삭제</button>
        </article>
      </div>
    </div>
@@ -115,25 +102,18 @@ async function removeList(t) {
  border-radius: 0;
  padding: 0;
 }
-.link {
-  padding: 10px 12px;
-  border-radius: 14px;
-  border: 1px solid rgba(255, 255, 255, 0.14);
-  background: rgba(255, 255, 255, 0.06);
-  color: rgba(255, 255, 255, 0.92);
-  cursor: pointer;
-  font-weight: 800;
-}
 .empty {
  opacity: 0.75;
 }
 .list {
  display: grid;
-  grid-template-columns: repeat(4, minmax(0, 1fr));
+  grid-template-columns: repeat(auto-fit, minmax(260px, 320px));
+  justify-content: start;
  gap: 18px;
 }
 .boardCard {
  display: grid;
+  min-width: 0;
  border-radius: 22px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(62, 62, 62, 0.82);
@@ -184,30 +164,40 @@ async function removeList(t) {
  border-radius: 18px;
 }
 .boardCard__title {
-  font-weight: 900;
+  flex: 1 1 auto;
  min-width: 0;
+  font-weight: 900;
  font-size: 18px;
-  white-space: nowrap;
+  line-height: 1.3;
+  display: -webkit-box;
+  -webkit-line-clamp: 2;
+  -webkit-box-orient: vertical;
  overflow: hidden;
-  text-overflow: ellipsis;
 }
 .boardCard__head {
  padding: 16px 18px 18px;
  display: grid;
-  gap: 6px;
+  gap: 8px;
+  min-width: 0;
 }
 .boardCard__titleRow,
 .boardCard__metaRow {
  display: flex;
  gap: 10px;
+  min-width: 0;
  align-items: center;
  justify-content: space-between;
 }

+.boardCard__titleRow {
+  align-items: flex-start;
+}
+
 .boardCard__metaRow {
  align-items: flex-end;
 }
 .boardCard__author {
+  flex: 1 1 auto;
  min-width: 0;
  display: inline-flex;
  gap: 7px;
@@ -246,21 +236,6 @@ async function removeList(t) {
 .boardCard__date {
  font-size: 10px;
 }
-.link--danger {
-  background: rgba(239, 68, 68, 0.14);
-  border-color: rgba(239, 68, 68, 0.28);
-  margin: 0 18px 18px;
-}
-@media (max-width: 1400px) {
-  .list {
-    grid-template-columns: repeat(3, minmax(0, 1fr));
-  }
-}
-@media (max-width: 1024px) {
-  .list {
-    grid-template-columns: repeat(2, minmax(0, 1fr));
-  }
-}
@media (max-width: 720px) {
  .list {
    grid-template-columns: 1fr;
--- a/frontend/src/views/TierEditorView.vue
+++ b/frontend/src/views/TierEditorView.vue
@@ -24,7 +24,6 @@ const groups = ref([
  { id: 'gA', name: 'A', itemIds: [] },
  { id: 'gB', name: 'B', itemIds: [] },
  { id: 'gC', name: 'C', itemIds: [] },
-  { id: 'gD', name: 'D', itemIds: [] },
 ])

 const pool = ref([])
@@ -50,6 +49,9 @@ const ownerId = ref('')
 const authorName = ref('')
 const authorAccountName = ref('')
 const updatedAt = ref(0)
+const sourceTierListId = ref('')
+const sourceSnapshotTitle = ref('')
+const sourceSnapshotAuthor = ref('')
 const isDragActive = ref(false)
 const isThumbnailDragActive = ref(false)
 const iconSize = ref(80)
@@ -96,6 +98,14 @@ const untitledWarning = computed(
    '제목 없이 저장된 티어표는 무분별한 도배 방지를 위해 관리자에 의해 임의 삭제될 수 있어요.'
 )
 const canFavorite = computed(() => !!auth.user && !isNewTierList.value && !canEdit.value)
+const canDuplicate = computed(() => !!auth.user && !isNewTierList.value && !canEdit.value)
+const copiedFromLabel = computed(() => {
+  if (!sourceTierListId.value) return ''
+  const parts = []
+  if (sourceSnapshotTitle.value) parts.push(`원본 ${sourceSnapshotTitle.value}`)
+  if (sourceSnapshotAuthor.value) parts.push(sourceSnapshotAuthor.value)
+  return parts.join(' · ') || '복사해 온 티어표'
+})
 const customItems = computed(() =>
  Object.values(itemsById.value)
    .filter((item) => item?.origin === 'custom')
@@ -474,6 +484,9 @@ function buildPayload(existingId) {
    description: (description.value || '').trim(),
    isPublic: !!isPublic.value,
    showCharacterNames: !!showCharacterNames.value,
+    sourceTierListId: sourceTierListId.value || '',
+    sourceSnapshotTitle: sourceSnapshotTitle.value || '',
+    sourceSnapshotAuthor: sourceSnapshotAuthor.value || '',
    groups: groups.value.map((g) => ({ id: g.id, name: g.name, itemIds: g.itemIds })),
    pool: Object.values(itemsById.value),
  }
@@ -562,6 +575,19 @@ async function confirmDeleteTierList() {
  }
 }

+async function duplicateCurrentTierList() {
+  if (!canDuplicate.value) return
+  try {
+    const data = await api.duplicateTierList(tierListId.value)
+    const duplicatedId = data.tierList?.id
+    if (!duplicatedId) throw new Error('duplicate_failed')
+    toast.success('티어표를 복사해 내 작업으로 가져왔어요.')
+    router.push(`/editor/${gameId.value}/${duplicatedId}`)
+  } catch (e) {
+    error.value = '티어표 복사에 실패했어요.'
+  }
+}
+
 async function toggleFavorite() {
  if (!canFavorite.value || isFavoriteBusy.value) return
  try {
@@ -654,6 +680,9 @@ onMounted(() => {
        authorName.value = t.authorName || ''
        authorAccountName.value = t.authorAccountName || ''
        updatedAt.value = Number(t.updatedAt || 0)
+        sourceTierListId.value = t.sourceTierListId || ''
+        sourceSnapshotTitle.value = t.sourceSnapshotTitle || ''
+        sourceSnapshotAuthor.value = t.sourceSnapshotAuthor || ''
        favoriteCount.value = Number(t.favoriteCount || 0)
        isFavorited.value = !!t.isFavorited
        groups.value = t.groups
@@ -700,7 +729,7 @@ onUnmounted(() => {
      <div v-if="pool.length" class="previewOnly__pool">
        <div class="previewOnly__poolTitle">남은 아이템</div>
        <div class="previewOnly__poolGrid">
-          <div v-for="id in pool" :key="id" class="previewOnly__poolItem">
+          <div v-for="id in pool" :key="id" class="previewOnly__poolItem previewOnly__poolItem--inactive">
            <img :src="resolveItemSrc(itemsById[id])" class="thumb" :alt="itemsById[id]?.label || id" />
          </div>
        </div>
@@ -817,6 +846,10 @@ onUnmounted(() => {
              공개된 티어표를 보는 중입니다. 로그인한 작성자만 수정할 수 있어요.
            </template>
          </div>
+          <div v-if="sourceTierListId" class="editorMain__sourceNote">
+            <span>복사본</span>
+            <button class="editorMain__sourceLink" type="button" @click="router.push(`/editor/${gameId}/${sourceTierListId}`)">{{ copiedFromLabel }}</button>
+          </div>
        </div>
      </section>

@@ -912,9 +945,10 @@ onUnmounted(() => {
            {{ canEdit ? '등록된 아이템 리스트입니다. 드래그해서 표에 넣을 수 있습니다.' : '공개 티어표는 보기 전용입니다.' }}
          </div>
          <div ref="poolEl" class="pool" data-list-type="pool">
-            <div v-for="id in pool" :key="id" class="poolItem" :data-item-id="id">
+            <div v-for="id in pool" :key="id" class="poolItem" :class="{ 'poolItem--readonly': !canEdit }" :data-item-id="id">
              <img :src="resolveItemSrc(itemsById[id])" class="thumb" :alt="itemsById[id]?.label || id" />
              <div class="poolItem__label">{{ itemsById[id]?.label || id }}</div>
+              <div v-if="!canEdit" class="poolItem__state">미배치</div>
            </div>
          </div>
        </div>
@@ -1006,6 +1040,7 @@ onUnmounted(() => {
        </div>
        <div class="editorSidebar__utilityLinks">
          <button v-if="canEdit && !isNewTierList" class="editorSidebar__utilityLink editorSidebar__utilityLink--danger" @click="openDeleteModal">삭제하기</button>
+          <button v-if="canDuplicate" class="editorSidebar__utilityLink" @click="duplicateCurrentTierList">복사해서 내 티어표로 가져오기</button>
          <button
            v-if="canRequestTemplateCreate"
            class="editorSidebar__utilityLink"
@@ -1056,6 +1091,23 @@ onUnmounted(() => {
  font-size: 13px;
  line-height: 1.5;
 }
+.editorMain__sourceNote {
+  margin-top: 4px;
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  flex-wrap: wrap;
+  font-size: 12px;
+  color: rgba(255, 255, 255, 0.62);
+}
+.editorMain__sourceLink {
+  border: 0;
+  padding: 0;
+  background: transparent;
+  color: rgba(191, 219, 254, 0.94);
+  font: inherit;
+  cursor: pointer;
+}
 .previewOnly {
  min-height: 100vh;
  padding: 20px;
@@ -1134,6 +1186,10 @@ onUnmounted(() => {
  display: inline-flex;
  position: relative;
 }
+.previewOnly__poolItem--inactive {
+  opacity: 0.52;
+  filter: grayscale(0.22) brightness(0.78);
+}
 .toggleSwitch {
  display: inline-flex;
  align-items: center;
@@ -1846,6 +1902,10 @@ onUnmounted(() => {
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(0, 0, 0, 0.18);
 }
+.poolItem--readonly {
+  opacity: 0.58;
+  filter: grayscale(0.25) brightness(0.78);
+}
 .poolItem .thumb {
  width: 100%;
  max-width: var(--thumb-size, 80px);
@@ -1864,6 +1924,13 @@ onUnmounted(() => {
  text-overflow: ellipsis;
  white-space: nowrap;
 }
+.poolItem__state {
+  font-size: 10px;
+  font-weight: 800;
+  letter-spacing: 0.04em;
+  text-transform: uppercase;
+  color: rgba(255, 255, 255, 0.58);
+}
 .hidden {
  display: none;
 }
Author	SHA1	Message	Date
zenn	0581de6c17	이미지 최적화 작업 큐 추가	2026-03-31 17:44:03 +09:00
zenn	4db1b21ad5	중복 이미지 해시 재사용 추가	2026-03-31 17:39:54 +09:00
zenn	d760c7331a	업로드 이미지 WebP 최적화 1차 적용	2026-03-31 17:33:52 +09:00
zenn	ebe7a4408f	릴리스: v1.2.73 게임 허브 리스트 마감 보정	2026-03-31 17:13:28 +09:00
zenn	2fba826900	릴리스: v1.2.72 게임 허브 보기 전환과 카드 보정	2026-03-31 17:07:21 +09:00
zenn	5b047b0458	릴리스: v1.2.71 공개 티어표 복사와 보기 상태 보정	2026-03-31 16:52:17 +09:00
zenn	6dce53db7a	릴리스: v1.2.70 관리자 게임 관리 레이아웃 정리	2026-03-31 16:35:43 +09:00
zenn	3227181c24	릴리스: v1.2.69 관리자 게임 관리 재배치와 셸 전환 보정	2026-03-31 16:28:37 +09:00
zenn	fadfd0ba58	릴리스: v1.2.68 기본 티어 줄 수와 셸 아이콘 버튼 정리	2026-03-31 16:09:49 +09:00
zenn	f77ce2a580	릴리스: v1.2.67 홈 즐겨찾기 재정렬 애니메이션 추가	2026-03-31 16:06:20 +09:00
zenn	50773f799a	릴리스: v1.2.66 내 티어표 카드 밀도와 액션 단순화	2026-03-31 16:02:00 +09:00