diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index d7cffefe..84eea3a4 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -8,9 +8,18 @@
       "Bash(./gradlew:*)",
       "Bash(docker-compose up:*)",
       "Bash(docker-compose:*)",
-      "Bash(docker logs:*)"
+      "Bash(docker logs:*)",
+      "mcp__serena__get_current_config",
+      "mcp__serena__check_onboarding_performed",
+      "mcp__serena__onboarding",
+      "mcp__serena__list_dir",
+      "mcp__serena__find_file",
+      "mcp__serena__write_memory",
+      "mcp__serena__think_about_whether_you_are_done",
+      "mcp__serena__search_for_pattern",
+      "Bash(cat:*)"
     ],
     "deny": [],
     "ask": []
   }
-}
\ No newline at end of file
+}
diff --git a/.github/linters/.redocly.yaml b/.github/linters/.redocly.yaml
new file mode 100644
index 00000000..976079dc
--- /dev/null
+++ b/.github/linters/.redocly.yaml
@@ -0,0 +1,5 @@
+apis:
+  main:
+    root: api-spec/root.json
+rules:
+  no-unresolved-refs: off
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 28d54d5a..87e35e55 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,9 +19,11 @@ jobs:
           filters: |
             backend:
               - 'backend/**'
+              - 'api-spec/**'
               - '.github/workflows/**'
             frontend:
               - 'frontend/**'
+              - 'api-spec/**'
               - '.github/workflows/**'
 
   backend_lint:
diff --git a/.gitignore b/.gitignore
index 6c3aca4e..4e0904c6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-.serena
+# Serena memory files (local AI assistant context)
+.serena/
diff --git a/backend/src/main/resources/api-spec/headers/set-cookie.json b/api-spec/headers/set-cookie.json
similarity index 100%
rename from backend/src/main/resources/api-spec/headers/set-cookie.json
rename to api-spec/headers/set-cookie.json
diff --git a/backend/src/main/resources/api-spec/model/accountLink.json b/api-spec/model/accountLink.json
similarity index 90%
rename from backend/src/main/resources/api-spec/model/accountLink.json
rename to api-spec/model/accountLink.json
index 2191ed22..cb0fc3c9 100644
--- a/backend/src/main/resources/api-spec/model/accountLink.json
+++ b/api-spec/model/accountLink.json
@@ -9,7 +9,7 @@
     },
     "linking": {
       "type": "boolean",
-      "example": "true"
+      "example": true
     }
   },
   "required": [
diff --git a/backend/src/main/resources/api-spec/model/comment.json b/api-spec/model/comment.json
similarity index 100%
rename from backend/src/main/resources/api-spec/model/comment.json
rename to api-spec/model/comment.json
diff --git a/backend/src/main/resources/api-spec/model/comments.json b/api-spec/model/comments.json
similarity index 100%
rename from backend/src/main/resources/api-spec/model/comments.json
rename to api-spec/model/comments.json
diff --git a/backend/src/main/resources/api-spec/model/entries.json b/api-spec/model/entries.json
similarity index 100%
rename from backend/src/main/resources/api-spec/model/entries.json
rename to api-spec/model/entries.json
diff --git a/backend/src/main/resources/api-spec/model/entry.json b/api-spec/model/entry.json
similarity index 100%
rename from backend/src/main/resources/api-spec/model/entry.json
rename to api-spec/model/entry.json
diff --git a/backend/src/main/resources/api-spec/model/error/error400.json b/api-spec/model/error/error400.json
similarity index 84%
rename from backend/src/main/resources/api-spec/model/error/error400.json
rename to api-spec/model/error/error400.json
index ab30a6f0..e2fe69be 100644
--- a/backend/src/main/resources/api-spec/model/error/error400.json
+++ b/api-spec/model/error/error400.json
@@ -8,11 +8,11 @@
   "properties": {
     "status": {
       "type": "integer",
-      "const": 400
+      "enum": [400]
     },
     "description": {
       "type": "string",
-      "const": "BadRequest"
+      "enum": ["BadRequest"]
     }
   },
   "required": [
diff --git a/backend/src/main/resources/api-spec/model/error/error401.json b/api-spec/model/error/error401.json
similarity index 83%
rename from backend/src/main/resources/api-spec/model/error/error401.json
rename to api-spec/model/error/error401.json
index adba8259..791ccc4a 100644
--- a/backend/src/main/resources/api-spec/model/error/error401.json
+++ b/api-spec/model/error/error401.json
@@ -8,11 +8,11 @@
   "properties": {
     "status": {
       "type": "integer",
-      "const": 401
+      "enum": [401]
     },
     "description": {
       "type": "string",
-      "const": "Unauthorized"
+      "enum": ["Unauthorized"]
     }
   },
   "required": [
diff --git a/api-spec/model/error/error403.json b/api-spec/model/error/error403.json
new file mode 100644
index 00000000..927b35f4
--- /dev/null
+++ b/api-spec/model/error/error403.json
@@ -0,0 +1,25 @@
+{
+  "allOf": [
+    {
+      "$ref": "./errorBase.json"
+    }
+  ],
+  "type": "object",
+  "properties": {
+    "status": {
+      "type": "integer",
+      "enum": [403]
+    },
+    "description": {
+      "type": "string",
+      "enum": ["Forbidden"]
+    },
+    "cause": {
+      "$ref": "./error403Cause.json"
+    }
+  },
+  "required": [
+    "status",
+    "description"
+  ]
+}
diff --git a/api-spec/model/error/error403Cause.json b/api-spec/model/error/error403Cause.json
new file mode 100644
index 00000000..bef5afd8
--- /dev/null
+++ b/api-spec/model/error/error403Cause.json
@@ -0,0 +1,16 @@
+{
+  "type": "object",
+  "properties": {
+    "kind": {
+      "type": "string",
+      "enum": [
+        "CsrfTokenRequired",
+        "CsrfHeaderRequired",
+        "InvalidOrigin"
+      ]
+    }
+  },
+  "required": [
+    "kind"
+  ]
+}
diff --git a/backend/src/main/resources/api-spec/model/error/error404.json b/api-spec/model/error/error404.json
similarity index 84%
rename from backend/src/main/resources/api-spec/model/error/error404.json
rename to api-spec/model/error/error404.json
index 0232fc11..7c909d60 100644
--- a/backend/src/main/resources/api-spec/model/error/error404.json
+++ b/api-spec/model/error/error404.json
@@ -8,11 +8,11 @@
   "properties": {
     "status": {
       "type": "integer",
-      "const": 404
+      "enum": [404]
     },
     "description": {
       "type": "string",
-      "const": "NotFound"
+      "enum": ["NotFound"]
     }
   },
   "required": [
diff --git a/backend/src/main/resources/api-spec/model/error/error409.json b/api-spec/model/error/error409.json
similarity index 84%
rename from backend/src/main/resources/api-spec/model/error/error409.json
rename to api-spec/model/error/error409.json
index 816da4b7..93bf577e 100644
--- a/backend/src/main/resources/api-spec/model/error/error409.json
+++ b/api-spec/model/error/error409.json
@@ -8,11 +8,11 @@
   "properties": {
     "status": {
       "type": "integer",
-      "const": 409
+      "enum": [409]
     },
     "description": {
       "type": "string",
-      "const": "Conflict"
+      "enum": ["Conflict"]
     }
   },
   "required": [
diff --git a/backend/src/main/resources/api-spec/model/error/errorBase.json b/api-spec/model/error/errorBase.json
similarity index 91%
rename from backend/src/main/resources/api-spec/model/error/errorBase.json
rename to api-spec/model/error/errorBase.json
index b786eb7e..bf57f89b 100644
--- a/backend/src/main/resources/api-spec/model/error/errorBase.json
+++ b/api-spec/model/error/errorBase.json
@@ -4,7 +4,7 @@
     "status": {
       "type": "integer",
       "minimum": 400,
-      "exclusiveMaximum": 600,
+      "maximum": 599,
       "example": 401
     },
     "description": {
diff --git a/backend/src/main/resources/api-spec/model/error/errorCause.json b/api-spec/model/error/errorCause.json
similarity index 100%
rename from backend/src/main/resources/api-spec/model/error/errorCause.json
rename to api-spec/model/error/errorCause.json
diff --git a/backend/src/main/resources/api-spec/model/health.json b/api-spec/model/health.json
similarity index 100%
rename from backend/src/main/resources/api-spec/model/health.json
rename to api-spec/model/health.json
diff --git a/backend/src/main/resources/api-spec/model/user.json b/api-spec/model/user.json
similarity index 100%
rename from backend/src/main/resources/api-spec/model/user.json
rename to api-spec/model/user.json
diff --git a/backend/src/main/resources/api-spec/model/userDetail.json b/api-spec/model/userDetail.json
similarity index 100%
rename from backend/src/main/resources/api-spec/model/userDetail.json
rename to api-spec/model/userDetail.json
diff --git a/backend/src/main/resources/api-spec/model/users.json b/api-spec/model/users.json
similarity index 100%
rename from backend/src/main/resources/api-spec/model/users.json
rename to api-spec/model/users.json
diff --git a/backend/src/main/resources/api-spec/path/comments/comments.json b/api-spec/path/comments/comments.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/comments/comments.json
rename to api-spec/path/comments/comments.json
diff --git a/backend/src/main/resources/api-spec/path/entries/_serialNumber/_serialNumber.json b/api-spec/path/entries/_serialNumber/_serialNumber.json
similarity index 98%
rename from backend/src/main/resources/api-spec/path/entries/_serialNumber/_serialNumber.json
rename to api-spec/path/entries/_serialNumber/_serialNumber.json
index fa018fa0..4dd01cc5 100644
--- a/backend/src/main/resources/api-spec/path/entries/_serialNumber/_serialNumber.json
+++ b/api-spec/path/entries/_serialNumber/_serialNumber.json
@@ -52,6 +52,7 @@
         "description": "unauthorized or not signed in"
       },
       "403": {
+        "description": "Forbidden",
         "content": {
           "application/json": {
             "schema": {
diff --git a/backend/src/main/resources/api-spec/path/entries/_serialNumber/comments/_commentId/_commentId.json b/api-spec/path/entries/_serialNumber/comments/_commentId/_commentId.json
similarity index 96%
rename from backend/src/main/resources/api-spec/path/entries/_serialNumber/comments/_commentId/_commentId.json
rename to api-spec/path/entries/_serialNumber/comments/_commentId/_commentId.json
index 8a8f11f0..d10b9d62 100644
--- a/backend/src/main/resources/api-spec/path/entries/_serialNumber/comments/_commentId/_commentId.json
+++ b/api-spec/path/entries/_serialNumber/comments/_commentId/_commentId.json
@@ -12,6 +12,7 @@
         "description": "unauthorized or not signed in"
       },
       "403": {
+        "description": "Forbidden",
         "content": {
           "application/json": {
             "schema": {
diff --git a/backend/src/main/resources/api-spec/path/entries/_serialNumber/comments/comments.json b/api-spec/path/entries/_serialNumber/comments/comments.json
similarity index 90%
rename from backend/src/main/resources/api-spec/path/entries/_serialNumber/comments/comments.json
rename to api-spec/path/entries/_serialNumber/comments/comments.json
index ed8d6081..197db55b 100644
--- a/backend/src/main/resources/api-spec/path/entries/_serialNumber/comments/comments.json
+++ b/api-spec/path/entries/_serialNumber/comments/comments.json
@@ -28,7 +28,7 @@
         "content": {
           "application/json": {
             "schema": {
-              "$ref": "#/components/schemas/Comments"
+              "$ref": "../../../../model/comments.json"
             }
           }
         }
@@ -42,7 +42,7 @@
       "content": {
         "application/json": {
           "schema": {
-            "$ref": "path/entries/_serialNumber/comments/commentsPostRequest.json"
+            "$ref": "./commentsPostRequest.json"
           }
         }
       }
@@ -53,7 +53,7 @@
         "content": {
           "application/json": {
             "schema": {
-              "$ref": "#/components/schemas/Comment"
+              "$ref": "../../../../model/comment.json"
             }
           }
         }
@@ -65,6 +65,7 @@
         "description": "unauthorized to create a new comment"
       },
       "403": {
+        "description": "Forbidden",
         "content": {
           "application/json": {
             "schema": {
diff --git a/backend/src/main/resources/api-spec/path/entries/_serialNumber/comments/commentsPostRequest.json b/api-spec/path/entries/_serialNumber/comments/commentsPostRequest.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/entries/_serialNumber/comments/commentsPostRequest.json
rename to api-spec/path/entries/_serialNumber/comments/commentsPostRequest.json
diff --git a/backend/src/main/resources/api-spec/path/entries/_serialNumber/entriesSerialNumberPatchRequest.json b/api-spec/path/entries/_serialNumber/entriesSerialNumberPatchRequest.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/entries/_serialNumber/entriesSerialNumberPatchRequest.json
rename to api-spec/path/entries/_serialNumber/entriesSerialNumberPatchRequest.json
diff --git a/backend/src/main/resources/api-spec/path/entries/entries.json b/api-spec/path/entries/entries.json
similarity index 98%
rename from backend/src/main/resources/api-spec/path/entries/entries.json
rename to api-spec/path/entries/entries.json
index f8e6ff14..d95b269e 100644
--- a/backend/src/main/resources/api-spec/path/entries/entries.json
+++ b/api-spec/path/entries/entries.json
@@ -79,6 +79,7 @@
         }
       },
       "403": {
+        "description": "Forbidden",
         "content": {
           "application/json": {
             "schema": {
diff --git a/backend/src/main/resources/api-spec/path/entries/entriesPostRequest.json b/api-spec/path/entries/entriesPostRequest.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/entries/entriesPostRequest.json
rename to api-spec/path/entries/entriesPostRequest.json
diff --git a/backend/src/main/resources/api-spec/path/health/health.json b/api-spec/path/health/health.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/health/health.json
rename to api-spec/path/health/health.json
diff --git a/backend/src/main/resources/api-spec/path/sign-in/sign-in.json b/api-spec/path/sign-in/sign-in.json
similarity index 92%
rename from backend/src/main/resources/api-spec/path/sign-in/sign-in.json
rename to api-spec/path/sign-in/sign-in.json
index 550745d9..442e6308 100644
--- a/backend/src/main/resources/api-spec/path/sign-in/sign-in.json
+++ b/api-spec/path/sign-in/sign-in.json
@@ -29,6 +29,7 @@
         }
       },
       "403": {
+        "description": "Forbidden",
         "content": {
           "application/json": {
             "schema": {
@@ -38,6 +39,7 @@
         }
       },
       "404": {
+        "description": "Not Found",
         "content": {
           "application/json": {
             "schema": {
@@ -47,6 +49,7 @@
         }
       },
       "409": {
+        "description": "Conflict",
         "content": {
           "application/json": {
             "schema": {
diff --git a/backend/src/main/resources/api-spec/path/sign-in/sign-inPostRequest.json b/api-spec/path/sign-in/sign-inPostRequest.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/sign-in/sign-inPostRequest.json
rename to api-spec/path/sign-in/sign-inPostRequest.json
diff --git a/backend/src/main/resources/api-spec/path/sign-out/responseOkHeaderSetCookie.json b/api-spec/path/sign-out/responseOkHeaderSetCookie.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/sign-out/responseOkHeaderSetCookie.json
rename to api-spec/path/sign-out/responseOkHeaderSetCookie.json
diff --git a/backend/src/main/resources/api-spec/path/sign-out/sign-out.json b/api-spec/path/sign-out/sign-out.json
similarity index 76%
rename from backend/src/main/resources/api-spec/path/sign-out/sign-out.json
rename to api-spec/path/sign-out/sign-out.json
index 0dcb32dd..9316e408 100644
--- a/backend/src/main/resources/api-spec/path/sign-out/sign-out.json
+++ b/api-spec/path/sign-out/sign-out.json
@@ -12,9 +12,12 @@
         }
       },
       "403": {
+        "description": "Forbidden",
         "content": {
           "application/json": {
-            "$ref": "../../model/error/error403.json"
+            "schema": {
+              "$ref": "../../model/error/error403.json"
+            }
           }
         }
       }
diff --git a/backend/src/main/resources/api-spec/path/users/_id/_id.json b/api-spec/path/users/_id/_id.json
similarity index 89%
rename from backend/src/main/resources/api-spec/path/users/_id/_id.json
rename to api-spec/path/users/_id/_id.json
index b83f17fd..31739116 100644
--- a/backend/src/main/resources/api-spec/path/users/_id/_id.json
+++ b/api-spec/path/users/_id/_id.json
@@ -58,9 +58,12 @@
         "description": "unauthorized or not signed in"
       },
       "403": {
+        "description": "Forbidden",
         "content": {
           "application/json": {
-            "$ref": "../../../model/error/error403.json"
+            "schema": {
+              "$ref": "../../../model/error/error403.json"
+            }
           }
         }
       }
@@ -84,9 +87,12 @@
         "description": "unauthorized or not signed in"
       },
       "403": {
+        "description": "Forbidden",
         "content": {
           "application/json": {
-            "$ref": "../../../model/error/error403.json"
+            "schema": {
+              "$ref": "../../../model/error/error403.json"
+            }
           }
         }
       }
diff --git a/backend/src/main/resources/api-spec/path/users/_id/usersIdPatchRequest.json b/api-spec/path/users/_id/usersIdPatchRequest.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/users/_id/usersIdPatchRequest.json
rename to api-spec/path/users/_id/usersIdPatchRequest.json
diff --git a/backend/src/main/resources/api-spec/path/users/admins/admin.json b/api-spec/path/users/admins/admin.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/users/admins/admin.json
rename to api-spec/path/users/admins/admin.json
diff --git a/backend/src/main/resources/api-spec/path/users/admins/admins.json b/api-spec/path/users/admins/admins.json
similarity index 91%
rename from backend/src/main/resources/api-spec/path/users/admins/admins.json
rename to api-spec/path/users/admins/admins.json
index bd05c9ad..08f5ff61 100644
--- a/backend/src/main/resources/api-spec/path/users/admins/admins.json
+++ b/api-spec/path/users/admins/admins.json
@@ -39,9 +39,12 @@
         "description": "Bad Request"
       },
       "403": {
+        "description": "Forbidden",
         "content": {
           "application/json": {
-            "$ref": "../../../model/error/error403.json"
+            "schema": {
+              "$ref": "../../../model/error/error403.json"
+            }
           }
         }
       }
diff --git a/backend/src/main/resources/api-spec/path/users/admins/adminsGetResponse.json b/api-spec/path/users/admins/adminsGetResponse.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/users/admins/adminsGetResponse.json
rename to api-spec/path/users/admins/adminsGetResponse.json
diff --git a/backend/src/main/resources/api-spec/path/users/current/current.json b/api-spec/path/users/current/current.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/users/current/current.json
rename to api-spec/path/users/current/current.json
diff --git a/backend/src/main/resources/api-spec/path/users/users.json b/api-spec/path/users/users.json
similarity index 90%
rename from backend/src/main/resources/api-spec/path/users/users.json
rename to api-spec/path/users/users.json
index 5a4cd400..68b3d0e1 100644
--- a/backend/src/main/resources/api-spec/path/users/users.json
+++ b/api-spec/path/users/users.json
@@ -54,9 +54,12 @@
         "description": "Bad Request. Maybe screen name is duplicated"
       },
       "403": {
+        "description": "Forbidden",
         "content": {
           "application/json": {
-            "$ref": "../../model/error/error403.json"
+            "schema": {
+              "$ref": "../../model/error/error403.json"
+            }
           }
         }
       }
diff --git a/backend/src/main/resources/api-spec/path/users/usersPostRequest.json b/api-spec/path/users/usersPostRequest.json
similarity index 100%
rename from backend/src/main/resources/api-spec/path/users/usersPostRequest.json
rename to api-spec/path/users/usersPostRequest.json
diff --git a/backend/src/main/resources/api-spec/root.json b/api-spec/root.json
similarity index 100%
rename from backend/src/main/resources/api-spec/root.json
rename to api-spec/root.json
diff --git a/backend/build.gradle.kts b/backend/build.gradle.kts
index 6d698912..842e30e4 100644
--- a/backend/build.gradle.kts
+++ b/backend/build.gradle.kts
@@ -45,7 +45,7 @@ application {
 // https://github.com/OpenAPITools/openapi-generator/blob/master/docs/generators/kotlin-server.md
 openApiGenerate {
     generatorName.set("kotlin-server")
-    inputSpec.set("$rootDir/src/main/resources/api-spec/root.json")
+    inputSpec.set("$rootDir/../api-spec/root.json")
     val generatedDirPath =
         layout
             .buildDirectory
diff --git a/backend/src/main/kotlin/com/github/hmiyado/kottage/application/plugins/statuspages/ErrorFactory.kt b/backend/src/main/kotlin/com/github/hmiyado/kottage/application/plugins/statuspages/ErrorFactory.kt
index b95d6cd7..67dc46b7 100644
--- a/backend/src/main/kotlin/com/github/hmiyado/kottage/application/plugins/statuspages/ErrorFactory.kt
+++ b/backend/src/main/kotlin/com/github/hmiyado/kottage/application/plugins/statuspages/ErrorFactory.kt
@@ -8,14 +8,14 @@ import com.github.hmiyado.kottage.openapi.models.Error409
 object ErrorFactory {
     fun create400(description: String = "BadRequest") =
         Error400(
-            status = 400,
-            description = description,
+            status = Error400.Status._400,
+            description = Error400.Description.BadRequest,
         )
 
     fun create403(kind: Error403Cause.Kind? = null) =
         Error403(
-            status = 403,
-            description = "Forbidden",
+            status = Error403.Status._403,
+            description = Error403.Description.Forbidden,
             cause =
                 kind?.let {
                     Error403Cause(
@@ -26,7 +26,7 @@ object ErrorFactory {
 
     fun create409() =
         Error409(
-            status = 409,
-            description = "Conflict",
+            status = Error409.Status._409,
+            description = Error409.Description.Conflict,
         )
 }
diff --git a/backend/src/main/resources/api-spec/model/error/error403.json b/backend/src/main/resources/api-spec/model/error/error403.json
deleted file mode 100644
index e2533cf7..00000000
--- a/backend/src/main/resources/api-spec/model/error/error403.json
+++ /dev/null
@@ -1,33 +0,0 @@
-{
-  "type": "object",
-  "properties": {
-    "status": {
-      "type": "integer",
-      "const": 403
-    },
-    "description": {
-      "type": "string",
-      "const": "Forbidden"
-    },
-    "cause": {
-      "type": "object",
-      "properties": {
-        "kind": {
-          "type": "string",
-          "enum": [
-            "CsrfTokenRequired",
-            "CsrfHeaderRequired",
-            "InvalidOrigin"
-          ]
-        }
-      },
-      "required": [
-        "kind"
-      ]
-    }
-  },
-  "required": [
-    "status",
-    "description"
-  ]
-}
diff --git a/frontend/.gitignore b/frontend/.gitignore
index f519984c..3bc438a9 100644
--- a/frontend/.gitignore
+++ b/frontend/.gitignore
@@ -53,3 +53,6 @@ yarn-error.log*
 # switch tsconfig.json by environment and replace default config
 tsconfig.json
 tsconfig.tsbuildinfo
+
+# OpenAPI Generator metadata
+src/repository/openapi/generated/.openapi-generator/
diff --git a/frontend/openapitools.json b/frontend/openapitools.json
index 8526c4b3..4d7f2307 100644
--- a/frontend/openapitools.json
+++ b/frontend/openapitools.json
@@ -6,8 +6,8 @@
     "generators": {
       "v1.0": {
         "generatorName": "typescript-fetch",
-        "inputSpec": "#{cwd}/../backend/src/main/resources/api-spec/root.json",
-        "glob": "../backend/src/main/resources/api-spec/*.json",
+        "inputSpec": "#{cwd}/../api-spec/root.json",
+        "glob": "../api-spec/*.json",
         "output": "#{cwd}/src/repository/openapi/generated",
         "ignoreFileOverride": "#{cwd}/src/repository/openapi/.openapi-generator-ignore",
         "additionalProperties": {
diff --git a/frontend/src/repository/openapi/generated/.openapi-generator/FILES b/frontend/src/repository/openapi/generated/.openapi-generator/FILES
deleted file mode 100644
index 65d266bc..00000000
--- a/frontend/src/repository/openapi/generated/.openapi-generator/FILES
+++ /dev/null
@@ -1,31 +0,0 @@
-.openapi-generator-ignore
-apis/DefaultApi.ts
-apis/index.ts
-index.ts
-models/AccountLink.ts
-models/Admin.ts
-models/AdminsGetResponse.ts
-models/Comment.ts
-models/Comments.ts
-models/CommentsPostRequest.ts
-models/Entries.ts
-models/EntriesPostRequest.ts
-models/EntriesSerialNumberPatchRequest.ts
-models/Entry.ts
-models/Error400.ts
-models/Error401.ts
-models/Error403.ts
-models/Error403Cause.ts
-models/Error404.ts
-models/Error409.ts
-models/ErrorBase.ts
-models/ErrorCause.ts
-models/Health.ts
-models/SignInPostRequest.ts
-models/User.ts
-models/UserDetail.ts
-models/Users.ts
-models/UsersIdPatchRequest.ts
-models/UsersPostRequest.ts
-models/index.ts
-runtime.ts
diff --git a/frontend/src/repository/openapi/generated/.openapi-generator/VERSION b/frontend/src/repository/openapi/generated/.openapi-generator/VERSION
deleted file mode 100644
index 368fd8fd..00000000
--- a/frontend/src/repository/openapi/generated/.openapi-generator/VERSION
+++ /dev/null
@@ -1 +0,0 @@
-7.15.0
diff --git a/frontend/src/repository/openapi/generated/apis/DefaultApi.ts b/frontend/src/repository/openapi/generated/apis/DefaultApi.ts
index 71a7d2f1..abcd6422 100644
--- a/frontend/src/repository/openapi/generated/apis/DefaultApi.ts
+++ b/frontend/src/repository/openapi/generated/apis/DefaultApi.ts
@@ -26,6 +26,7 @@ import type {
   Error400,
   Error401,
   Error403,
+  Error4031,
   Error404,
   Error409,
   Health,
@@ -61,6 +62,8 @@ import {
   Error401ToJSON,
   Error403FromJSON,
   Error403ToJSON,
+  Error4031FromJSON,
+  Error4031ToJSON,
   Error404FromJSON,
   Error404ToJSON,
   Error409FromJSON,
diff --git a/frontend/src/repository/openapi/generated/models/Error400.ts b/frontend/src/repository/openapi/generated/models/Error400.ts
index 781e19ef..479b4950 100644
--- a/frontend/src/repository/openapi/generated/models/Error400.ts
+++ b/frontend/src/repository/openapi/generated/models/Error400.ts
@@ -32,13 +32,13 @@ export interface Error400 {
    * @type {number}
    * @memberof Error400
    */
-  status: number
+  status: Error400StatusEnum
   /**
    *
    * @type {string}
    * @memberof Error400
    */
-  description: string
+  description: Error400DescriptionEnum
   /**
    *
    * @type {ErrorCause}
@@ -47,6 +47,24 @@ export interface Error400 {
   cause?: ErrorCause
 }
 
+/**
+ * @export
+ */
+export const Error400StatusEnum = {
+  NUMBER_400: 400,
+} as const
+export type Error400StatusEnum =
+  (typeof Error400StatusEnum)[keyof typeof Error400StatusEnum]
+
+/**
+ * @export
+ */
+export const Error400DescriptionEnum = {
+  BadRequest: 'BadRequest',
+} as const
+export type Error400DescriptionEnum =
+  (typeof Error400DescriptionEnum)[keyof typeof Error400DescriptionEnum]
+
 /**
  * Check if a given object implements the Error400 interface.
  */
diff --git a/frontend/src/repository/openapi/generated/models/Error401.ts b/frontend/src/repository/openapi/generated/models/Error401.ts
index f1f0b724..75c5cb3f 100644
--- a/frontend/src/repository/openapi/generated/models/Error401.ts
+++ b/frontend/src/repository/openapi/generated/models/Error401.ts
@@ -32,13 +32,13 @@ export interface Error401 {
    * @type {number}
    * @memberof Error401
    */
-  status: number
+  status: Error401StatusEnum
   /**
    *
    * @type {string}
    * @memberof Error401
    */
-  description: string
+  description: Error401DescriptionEnum
   /**
    *
    * @type {ErrorCause}
@@ -47,6 +47,24 @@ export interface Error401 {
   cause?: ErrorCause
 }
 
+/**
+ * @export
+ */
+export const Error401StatusEnum = {
+  NUMBER_401: 401,
+} as const
+export type Error401StatusEnum =
+  (typeof Error401StatusEnum)[keyof typeof Error401StatusEnum]
+
+/**
+ * @export
+ */
+export const Error401DescriptionEnum = {
+  Unauthorized: 'Unauthorized',
+} as const
+export type Error401DescriptionEnum =
+  (typeof Error401DescriptionEnum)[keyof typeof Error401DescriptionEnum]
+
 /**
  * Check if a given object implements the Error401 interface.
  */
diff --git a/frontend/src/repository/openapi/generated/models/Error403.ts b/frontend/src/repository/openapi/generated/models/Error403.ts
index e0752448..fa7a60bc 100644
--- a/frontend/src/repository/openapi/generated/models/Error403.ts
+++ b/frontend/src/repository/openapi/generated/models/Error403.ts
@@ -13,6 +13,13 @@
  */
 
 import { mapValues } from '../runtime'
+import type { ErrorCause } from './ErrorCause'
+import {
+  ErrorCauseFromJSON,
+  ErrorCauseFromJSONTyped,
+  ErrorCauseToJSON,
+  ErrorCauseToJSONTyped,
+} from './ErrorCause'
 import type { Error403Cause } from './Error403Cause'
 import {
   Error403CauseFromJSON,
@@ -32,13 +39,13 @@ export interface Error403 {
    * @type {number}
    * @memberof Error403
    */
-  status: number
+  status: Error403StatusEnum
   /**
    *
    * @type {string}
    * @memberof Error403
    */
-  description: string
+  description: Error403DescriptionEnum
   /**
    *
    * @type {Error403Cause}
@@ -47,6 +54,24 @@ export interface Error403 {
   cause?: Error403Cause
 }
 
+/**
+ * @export
+ */
+export const Error403StatusEnum = {
+  NUMBER_403: 403,
+} as const
+export type Error403StatusEnum =
+  (typeof Error403StatusEnum)[keyof typeof Error403StatusEnum]
+
+/**
+ * @export
+ */
+export const Error403DescriptionEnum = {
+  Forbidden: 'Forbidden',
+} as const
+export type Error403DescriptionEnum =
+  (typeof Error403DescriptionEnum)[keyof typeof Error403DescriptionEnum]
+
 /**
  * Check if a given object implements the Error403 interface.
  */
diff --git a/frontend/src/repository/openapi/generated/models/Error4031.ts b/frontend/src/repository/openapi/generated/models/Error4031.ts
new file mode 100644
index 00000000..5030f914
--- /dev/null
+++ b/frontend/src/repository/openapi/generated/models/Error4031.ts
@@ -0,0 +1,121 @@
+/* tslint:disable */
+/* eslint-disable */
+/**
+ * kottage
+ * No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
+ *
+ * The version of the OpenAPI document: 1.0
+ *
+ *
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
+ * Do not edit the class manually.
+ */
+
+import { mapValues } from '../runtime'
+import type { ErrorCause } from './ErrorCause'
+import {
+  ErrorCauseFromJSON,
+  ErrorCauseFromJSONTyped,
+  ErrorCauseToJSON,
+  ErrorCauseToJSONTyped,
+} from './ErrorCause'
+import type { Error403Cause } from './Error403Cause'
+import {
+  Error403CauseFromJSON,
+  Error403CauseFromJSONTyped,
+  Error403CauseToJSON,
+  Error403CauseToJSONTyped,
+} from './Error403Cause'
+
+/**
+ *
+ * @export
+ * @interface Error4031
+ */
+export interface Error4031 {
+  /**
+   *
+   * @type {number}
+   * @memberof Error4031
+   */
+  status: Error4031StatusEnum
+  /**
+   *
+   * @type {string}
+   * @memberof Error4031
+   */
+  description: Error4031DescriptionEnum
+  /**
+   *
+   * @type {Error403Cause}
+   * @memberof Error4031
+   */
+  cause?: Error403Cause
+}
+
+/**
+ * @export
+ */
+export const Error4031StatusEnum = {
+  NUMBER_403: 403,
+} as const
+export type Error4031StatusEnum =
+  (typeof Error4031StatusEnum)[keyof typeof Error4031StatusEnum]
+
+/**
+ * @export
+ */
+export const Error4031DescriptionEnum = {
+  Forbidden: 'Forbidden',
+} as const
+export type Error4031DescriptionEnum =
+  (typeof Error4031DescriptionEnum)[keyof typeof Error4031DescriptionEnum]
+
+/**
+ * Check if a given object implements the Error4031 interface.
+ */
+export function instanceOfError4031(value: object): value is Error4031 {
+  if (!('status' in value) || value['status'] === undefined) return false
+  if (!('description' in value) || value['description'] === undefined)
+    return false
+  return true
+}
+
+export function Error4031FromJSON(json: any): Error4031 {
+  return Error4031FromJSONTyped(json, false)
+}
+
+export function Error4031FromJSONTyped(
+  json: any,
+  ignoreDiscriminator: boolean,
+): Error4031 {
+  if (json == null) {
+    return json
+  }
+  return {
+    status: json['status'],
+    description: json['description'],
+    cause:
+      json['cause'] == null ? undefined : Error403CauseFromJSON(json['cause']),
+  }
+}
+
+export function Error4031ToJSON(json: any): Error4031 {
+  return Error4031ToJSONTyped(json, false)
+}
+
+export function Error4031ToJSONTyped(
+  value?: Error4031 | null,
+  ignoreDiscriminator: boolean = false,
+): any {
+  if (value == null) {
+    return value
+  }
+
+  return {
+    status: value['status'],
+    description: value['description'],
+    cause: Error403CauseToJSON(value['cause']),
+  }
+}
diff --git a/frontend/src/repository/openapi/generated/models/Error404.ts b/frontend/src/repository/openapi/generated/models/Error404.ts
index ab8c0a13..2311469d 100644
--- a/frontend/src/repository/openapi/generated/models/Error404.ts
+++ b/frontend/src/repository/openapi/generated/models/Error404.ts
@@ -32,13 +32,13 @@ export interface Error404 {
    * @type {number}
    * @memberof Error404
    */
-  status: number
+  status: Error404StatusEnum
   /**
    *
    * @type {string}
    * @memberof Error404
    */
-  description: string
+  description: Error404DescriptionEnum
   /**
    *
    * @type {ErrorCause}
@@ -47,6 +47,24 @@ export interface Error404 {
   cause?: ErrorCause
 }
 
+/**
+ * @export
+ */
+export const Error404StatusEnum = {
+  NUMBER_404: 404,
+} as const
+export type Error404StatusEnum =
+  (typeof Error404StatusEnum)[keyof typeof Error404StatusEnum]
+
+/**
+ * @export
+ */
+export const Error404DescriptionEnum = {
+  NotFound: 'NotFound',
+} as const
+export type Error404DescriptionEnum =
+  (typeof Error404DescriptionEnum)[keyof typeof Error404DescriptionEnum]
+
 /**
  * Check if a given object implements the Error404 interface.
  */
diff --git a/frontend/src/repository/openapi/generated/models/Error409.ts b/frontend/src/repository/openapi/generated/models/Error409.ts
index 51f50de5..851ef94b 100644
--- a/frontend/src/repository/openapi/generated/models/Error409.ts
+++ b/frontend/src/repository/openapi/generated/models/Error409.ts
@@ -32,13 +32,13 @@ export interface Error409 {
    * @type {number}
    * @memberof Error409
    */
-  status: number
+  status: Error409StatusEnum
   /**
    *
    * @type {string}
    * @memberof Error409
    */
-  description: string
+  description: Error409DescriptionEnum
   /**
    *
    * @type {ErrorCause}
@@ -47,6 +47,24 @@ export interface Error409 {
   cause?: ErrorCause
 }
 
+/**
+ * @export
+ */
+export const Error409StatusEnum = {
+  NUMBER_409: 409,
+} as const
+export type Error409StatusEnum =
+  (typeof Error409StatusEnum)[keyof typeof Error409StatusEnum]
+
+/**
+ * @export
+ */
+export const Error409DescriptionEnum = {
+  Conflict: 'Conflict',
+} as const
+export type Error409DescriptionEnum =
+  (typeof Error409DescriptionEnum)[keyof typeof Error409DescriptionEnum]
+
 /**
  * Check if a given object implements the Error409 interface.
  */
diff --git a/frontend/src/repository/openapi/generated/models/index.ts b/frontend/src/repository/openapi/generated/models/index.ts
index 66e9de0c..c2f4bbb4 100644
--- a/frontend/src/repository/openapi/generated/models/index.ts
+++ b/frontend/src/repository/openapi/generated/models/index.ts
@@ -13,6 +13,7 @@ export * from './Entry'
 export * from './Error400'
 export * from './Error401'
 export * from './Error403'
+export * from './Error4031'
 export * from './Error403Cause'
 export * from './Error404'
 export * from './Error409'