@@ -0,0 +1,27 @@
+---
+'@objectstack/metadata-core': minor
+'@objectstack/metadata-protocol': minor
+'@objectstack/metadata': minor
+'@objectstack/platform-objects': minor
+'@objectstack/spec': minor
+---
+
+feat(metadata-core,metadata-protocol,metadata,platform-objects,spec)!: `sys_view_definition` retires as inert (ADR-0131 D13)
+
+Clause-②: no (narrowing)
+
+<!-- adr-0087: registered sys-view-definition-retired -->
+
+**BREAKING**, graded `minor` on the v18 prerelease line: Changesets is in pre mode with the tag `next`, and the fixed group is already majored by the line's opening marker, so this ships in an `18.0.0-next.N` like every other stage.
+
+`sys_view_definition` was declared for runtime-authored shared and personal views (ADR-0017) and never used for them: no framework code writes or reads its rows, and the Studio console's view doors write the ADR-0005 `view` overlay in `sys_metadata` through the metadata API. ADR-0131 D13 retires it. A runtime-authored view is a `view` metadata item, written through `PUT /api/v1/meta/view/<name>` (the client's `meta.saveItem` for type `view`); nothing about that path changes.
+
+**What moves for consumers.**
+
+- **The object.** FROM `import { SysViewDefinitionObject } from '@objectstack/metadata-core'` (or from `@objectstack/platform-objects`, or its `/metadata` subpath) TO nothing: delete the import. Neither `MetadataPlugin` nor the metadata protocol assembly registers the object any more, so the generic data door no longer serves it.
+- **The migration exports** of `@objectstack/metadata-protocol`. FROM `ensureViewDefinitionActiveIndex`, `resolveIndexExec`, `buildActiveIndexSql`, `VIEW_DEFINITION_TABLE`, `VIEW_ACTIVE_INDEX_NAME`, `VIEW_ACTIVE_PROBE_INDEX_NAME`, `VIEW_ACTIVE_INDEX_COLUMNS`, `EnsureViewIndexLogger`, `EnsureViewIndexStatus` and `EnsureViewIndexResult` TO nothing: delete the import. `classifyIndexFailure` and the `IndexExec` type are still exported, unchanged, from the shared index-migration module.
+- **The name.** `PLATFORM_OBJECTS_BY_PACKAGE['metadata-core']` (`@objectstack/spec/system`) lists four objects, and `isPlatformProvidedObjectName` answers `false` for `sys_view_definition`. A stack that names it (a lookup target, a flow trigger, a permission entry, a platform-global declaration) is now flagged as naming an unknown object: remove the reference.
+- **`os migrate duplicates`.** `runtimeIndexPreflight` carries three entries (the two `sys_metadata` overlay indexes and `sys_setting`'s row identity), with no `idx_sys_view_def_active` entry. A serving boot no longer runs the active-row index migration for the table, and no longer logs its `sys_view_definition active-row index` lines.
+- **Translations.** The platform translation bundles no longer carry `sys_view_definition` keys.
+
+**Existing databases.** Schema sync is additive and never drops a table, so a database an earlier release provisioned keeps `sys_view_definition`, with any rows a caller wrote through the generic data door; nothing reads them. `os migrate apply --allow-destructive` does not drop it either, because it reconciles declared objects only (measured on one database: it dropped an orphaned column of a declared table and left this table and its row in place). On a project with a host config, `os migrate plan` lists it among the platform-prefixed tables nothing declares. Export any row worth keeping; dropping the table is the operator's call, by hand: `DROP TABLE sys_view_definition`.
@@ -3093,79 +3093,6 @@ export const enObjects: NonNullable<TranslationData['objects']> = {
       }
     }
   },
-  sys_view_definition: {
-    label: "View Definition",
-    pluralLabel: "View Definitions",
-    description: "Runtime-authored view definitions (shared / personal layers). The package layer ships from source.",
-    fields: {
-      id: {
-        label: "ID"
-      },
-      name: {
-        label: "Name"
-      },
-      object: {
-        label: "Object"
-      },
-      view_kind: {
-        label: "View Kind",
-        options: {
-          list: "list",
-          form: "form"
-        }
-      },
-      label: {
-        label: "Label"
-      },
-      is_default: {
-        label: "Is Default"
-      },
-      view_order: {
-        label: "Order"
-      },
-      scope: {
-        label: "Scope",
-        options: {
-          shared: "shared",
-          personal: "personal"
-        }
-      },
-      owner: {
-        label: "Owner"
-      },
-      hidden: {
-        label: "Hidden"
-      },
-      config: {
-        label: "Config",
-        help: "ListView or FormView configuration (matches spec ViewItem.config)."
-      },
-      organization_id: {
-        label: "Organization",
-        help: "Organization for multi-tenant isolation."
-      },
-      state: {
-        label: "State",
-        options: {
-          draft: "draft",
-          active: "active",
-          archived: "archived"
-        }
-      },
-      created_by: {
-        label: "Created By"
-      },
-      created_at: {
-        label: "Created At"
-      },
-      updated_by: {
-        label: "Updated By"
-      },
-      updated_at: {
-        label: "Updated At"
-      }
-    }
-  },
   sys_metadata_audit: {
     label: "Metadata Audit",
     pluralLabel: "Metadata Audit",
 
@@ -3093,79 +3093,6 @@ export const esESObjects: NonNullable<TranslationData['objects']> = {
       }
     }
   },
-  sys_view_definition: {
-    label: "Definición de vista",
-    pluralLabel: "Definiciones de vista",
-    description: "Definiciones de vista creadas en tiempo de ejecución (capas compartida / personal). La capa de paquete se distribuye desde el código fuente.",
-    fields: {
-      id: {
-        label: "ID"
-      },
-      name: {
-        label: "Nombre"
-      },
-      object: {
-        label: "Objeto"
-      },
-      view_kind: {
-        label: "Tipo de vista",
-        options: {
-          list: "Lista",
-          form: "Formulario"
-        }
-      },
-      label: {
-        label: "Etiqueta"
-      },
-      is_default: {
-        label: "Es predeterminada"
-      },
-      view_order: {
-        label: "Orden"
-      },
-      scope: {
-        label: "Ámbito",
-        options: {
-          shared: "Compartida",
-          personal: "Personal"
-        }
-      },
-      owner: {
-        label: "Propietario"
-      },
-      hidden: {
-        label: "Oculta"
-      },
-      config: {
-        label: "Configuración",
-        help: "Configuración de ListView o FormView (coincide con ViewItem.config de la especificación)."
-      },
-      organization_id: {
-        label: "Organización",
-        help: "Organización para el aislamiento multiinquilino."
-      },
-      state: {
-        label: "Estado",
-        options: {
-          draft: "Borrador",
-          active: "Activa",
-          archived: "Archivada"
-        }
-      },
-      created_by: {
-        label: "Creado por"
-      },
-      created_at: {
-        label: "Creado el"
-      },
-      updated_by: {
-        label: "Actualizado por"
-      },
-      updated_at: {
-        label: "Actualizado el"
-      }
-    }
-  },
   sys_metadata_audit: {
     label: "Auditoría de metadatos",
     pluralLabel: "Auditoría de metadatos",
 
@@ -63,5 +63,4 @@ export const esESGeneratedSourceHashes: Readonly<Record<string, string>> = {
   "objects.sys_sso_provider._actions.register_sso_provider.params.mapName.placeholder": "a484c34aaf624bd6",
   "objects.sys_sso_provider._actions.register_sso_provider.params.scopes.placeholder": "58ac90cde28c764d",
   "objects.sys_sso_provider.fields.id.label": "00b0385c9c152888",
-  "objects.sys_view_definition.fields.id.label": "00b0385c9c152888",
 };
@@ -3093,79 +3093,6 @@ export const jaJPObjects: NonNullable<TranslationData['objects']> = {
       }
     }
   },
-  sys_view_definition: {
-    label: "ビュー定義",
-    pluralLabel: "ビュー定義",
-    description: "実行時に作成されたビュー定義（共有／個人レイヤー）。パッケージレイヤーはソースから提供されます。",
-    fields: {
-      id: {
-        label: "ID"
-      },
-      name: {
-        label: "名前"
-      },
-      object: {
-        label: "オブジェクト"
-      },
-      view_kind: {
-        label: "ビュー種別",
-        options: {
-          list: "リスト",
-          form: "フォーム"
-        }
-      },
-      label: {
-        label: "ラベル"
-      },
-      is_default: {
-        label: "デフォルト"
-      },
-      view_order: {
-        label: "並び順"
-      },
-      scope: {
-        label: "スコープ",
-        options: {
-          shared: "共有",
-          personal: "個人"
-        }
-      },
-      owner: {
-        label: "所有者"
-      },
-      hidden: {
-        label: "非表示"
-      },
-      config: {
-        label: "構成",
-        help: "ListView または FormView の構成（仕様の ViewItem.config に対応）。"
-      },
-      organization_id: {
-        label: "組織",
-        help: "マルチテナント分離のための組織。"
-      },
-      state: {
-        label: "状態",
-        options: {
-          draft: "下書き",
-          active: "有効",
-          archived: "アーカイブ済み"
-        }
-      },
-      created_by: {
-        label: "作成者"
-      },
-      created_at: {
-        label: "作成日時"
-      },
-      updated_by: {
-        label: "更新者"
-      },
-      updated_at: {
-        label: "更新日時"
-      }
-    }
-  },
   sys_metadata_audit: {
     label: "メタデータ監査",
     pluralLabel: "メタデータ監査",
 
@@ -53,5 +53,4 @@ export const jaJPGeneratedSourceHashes: Readonly<Record<string, string>> = {
   "objects.sys_sso_provider._actions.register_sso_provider.params.mapName.placeholder": "a484c34aaf624bd6",
   "objects.sys_sso_provider._actions.register_sso_provider.params.scopes.placeholder": "58ac90cde28c764d",
   "objects.sys_sso_provider.fields.id.label": "00b0385c9c152888",
-  "objects.sys_view_definition.fields.id.label": "00b0385c9c152888",
 };
@@ -3093,79 +3093,6 @@ export const zhCNObjects: NonNullable<TranslationData['objects']> = {
       }
     }
   },
-  sys_view_definition: {
-    label: "视图定义",
-    pluralLabel: "视图定义",
-    description: "运行时创建的视图定义（共享/个人层）。软件包层由源代码提供。",
-    fields: {
-      id: {
-        label: "ID"
-      },
-      name: {
-        label: "名称"
-      },
-      object: {
-        label: "对象"
-      },
-      view_kind: {
-        label: "视图类型",
-        options: {
-          list: "列表",
-          form: "表单"
-        }
-      },
-      label: {
-        label: "标签"
-      },
-      is_default: {
-        label: "默认视图"
-      },
-      view_order: {
-        label: "排序"
-      },
-      scope: {
-        label: "范围",
-        options: {
-          shared: "共享",
-          personal: "个人"
-        }
-      },
-      owner: {
-        label: "所有者"
-      },
-      hidden: {
-        label: "隐藏"
-      },
-      config: {
-        label: "配置",
-        help: "ListView 或 FormView 配置（与规范 ViewItem.config 一致）。"
-      },
-      organization_id: {
-        label: "组织",
-        help: "用于多租户隔离的组织。"
-      },
-      state: {
-        label: "状态",
-        options: {
-          draft: "草稿",
-          active: "活动",
-          archived: "已归档"
-        }
-      },
-      created_by: {
-        label: "创建人"
-      },
-      created_at: {
-        label: "创建时间"
-      },
-      updated_by: {
-        label: "更新人"
-      },
-      updated_at: {
-        label: "更新时间"
-      }
-    }
-  },
   sys_metadata_audit: {
     label: "元数据审计",
     pluralLabel: "元数据审计",
 
@@ -52,5 +52,4 @@ export const zhCNGeneratedSourceHashes: Readonly<Record<string, string>> = {
   "objects.sys_sso_provider._actions.register_sso_provider.params.mapName.placeholder": "a484c34aaf624bd6",
   "objects.sys_sso_provider._actions.register_sso_provider.params.scopes.placeholder": "58ac90cde28c764d",
   "objects.sys_sso_provider.fields.id.label": "00b0385c9c152888",
-  "objects.sys_view_definition.fields.id.label": "00b0385c9c152888",
 };