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+# DSL Language Specification
+
+This document describes the DSL system used to specify fullstack CRUD applications.
+
+`domain/*.api.dsl` is the single source of truth for the entire domain model and API
+contract. It drives Prisma schema generation, NestJS module generation, and React Admin
+resource generation.
+
+`api-summary.json` is a derived artifact generated from the api.dsl to stabilize
+LLM-first generation and feed the lightweight validation gate. It must never replace the
+DSL as the source of truth. The active prompt corpus that consumes this contract lives in
+`prompts/`.
+
+---
+
+# DSL Architecture
+
+## `domain/*.api.dsl`
+
+The api.dsl is the authoritative source of truth for:
+
+- entities and their attributes
+- scalar types and enums
+- primary keys and foreign keys
+- database-level constraints (required, unique, default)
+- relations between entities
+- DTO shapes per operation (Create, Update, Read, List)
+- nullability and requiredness of each DTO attribute per operation
+- HTTP methods and paths for each endpoint
+- endpoint names and groupings
+- pagination request/response contracts
+
+The api.dsl drives: Prisma schema, NestJS controller/service/DTO generation,
+and React Admin resource generation.
+
+Constraint: every `map Entity.field` or `sync Entity.field` reference in `domain/*.api.dsl`
+must resolve to an entity and field defined within the same api.dsl file.
+
+## Optional extension mechanism
+
+```text
+overrides/
+  api-overrides.dsl
+  ui-overrides.dsl
+```
+
+Override rules:
+
+- Overrides are optional.
+- The generator must work without them.
+- Overrides may refine derived API or UI behavior, but they must not duplicate or redefine
+entities, attributes, primary keys, foreign keys, relations, or enums.
+
+---
+
+# DSL Grammar Concepts
+
+## entity
+
+An **entity** is a domain object that becomes a database table and a first-class resource in the backend and frontend.
+
+```
+entity Equipment {
+  attribute id { type uuid; key primary; }
+  attribute name { type string; is required; }
+}
+```
+
+- **Domain:** Defines the canonical model; one entity = one Prisma model, one NestJS module, one React Admin resource.
+- **Naming:** PascalCase (e.g. `Equipment`, `EquipmentType`, `RepairOrder`).
+
+---
+
+## attribute
+
+An **attribute** is a field of an entity. It has a type and optional modifiers.
+
+```
+attribute name {
+  description "Наименование";
+  type string;
+  is required;
+  is unique;
+}
+```
+
+**Modifiers:**
+
+- `type` — required; one of: `string`, `uuid`, `integer`, `decimal`, `date`, `text`, `boolean`, `number`, or an enum name.
+- `key primary` — this attribute is the primary key.
+- `key foreign { relates Entity.field }` — foreign key to another entity's field.
+- `is required` — non-nullable.
+- `is unique` — unique constraint.
+- `is nullable` — explicitly nullable.
+- `default Value` — default value (for enums or literals).
+- `description "..."` — human-readable description.
+- `label "..."` — display label for UI.
+
+---
+
+## enum
+
+An **enum** defines a fixed set of values. Used for attributes that can only take one of these values.
+
+```
+enum EquipmentStatus {
+  value Active { label "В эксплуатации"; }
+  value Repair { label "В ремонте"; }
+}
+```
+
+- **value** — identifier used in data and code.
+- **label** — optional display label for UI.
+
+---
+
+## primary key
+
+Exactly one attribute per entity must be marked as primary key.
+
+```
+attribute id {
+  type uuid;
+  key primary;
+}
+```
+
+Or for a natural key:
+
+```
+attribute code {
+  type string;
+  key primary;
+  is required;
+  is unique;
+}
+```
+
+---
+
+## foreign key
+
+A **foreign key** links to another entity's primary key. The attribute type must match the referenced primary key type.
+
+```
+attribute equipmentTypeCode {
+  type string;
+  key foreign {
+    relates EquipmentType.code;
+  }
+  is required;
+}
+```
+
+- `relates Entity.attribute` — references `Entity`'s `attribute` (must be primary key).
+- FK type must equal referenced PK type (e.g. `string` → `EquipmentType.code`, `uuid` → `Equipment.id`).
+
+---
+
+## required
+
+- **is required** — attribute is non-nullable in the domain model and drives requiredness in derived DTO/API/UI artifacts.
+- Absence of `is required` means the attribute is optional (nullable).
+
+---
+
+## default
+
+- **default Value** — applied when no value is provided (e.g. enum defaults like `default Active`).
+- Value must exist in the enum when the attribute type is an enum.
+
+---
+
+# DSL → System Component Mapping
+
+## DSL → Prisma
+
+
+| DSL Concept  | Prisma Result               |
+| ------------ | --------------------------- |
+| entity       | model                       |
+| attribute    | field                       |
+| enum         | enum                        |
+| key primary  | @id or @id @default(uuid()) |
+| key foreign  | relation + references       |
+| type string  | String                      |
+| type uuid    | String @id @default(uuid()) |
+| type integer | Int                         |
+| type number  | Float                       |
+| type decimal | Decimal                     |
+| type date    | DateTime                    |
+| type text    | String                      |
+| type boolean | Boolean                     |
+
+
+---
+
+## DSL → NestJS
+
+
+| DSL Concept                 | NestJS Result                         |
+| --------------------------- | ------------------------------------- |
+| entity                      | One module (e.g. equipment.module.ts) |
+| entity                      | Controller with CRUD endpoints        |
+| entity                      | Service with Prisma CRUD              |
+| entity + attribute metadata | create-{entity}.dto.ts                |
+| entity + attribute metadata | update-{entity}.dto.ts                |
+| entity + attribute metadata | Response DTO / API shape              |
+
+
+API paths are derived from entity name: PascalCase → kebab-case, pluralized (e.g. `Equipment` → `/equipment`, `RepairOrder` → `/repair-orders`).
+
+---
+
+## DSL → React Admin
+
+
+| DSL Concept          | React Admin Result                  |
+| -------------------- | ----------------------------------- |
+| entity               | Resource (name = kebab-case plural) |
+| attribute            | Form field / column                 |
+| type string          | TextInput, TextField                |
+| type integer/decimal | NumberInput, NumberField            |
+| type number          | NumberInput, NumberField            |
+| type date            | DateInput, DateField                |
+| type boolean         | BooleanInput, BooleanField          |
+| enum                 | SelectInput with choices            |
+| foreign key          | ReferenceInput, ReferenceField      |
+
+
+---
+
+# API DSL Layer Mapping
+
+DTO shapes and endpoint contracts are declared in `domain/*.api.dsl`. The api.dsl
+is the authoritative source for:
+
+- **Create DTO** — declared as `dto DTO.<Entity>Create` in api.dsl. Must not include
+server-generated primary keys (e.g. no `id` for uuid PKs). Required/nullable per field
+is explicit in the api.dsl, not inferred.
+- **Update DTO** — declared as `dto DTO.<Entity>Update` in api.dsl. All fields are
+typically nullable for partial update semantics.
+- **API response shape** — declared as `dto DTO.<Entity>` in api.dsl. Must expose
+React Admin-compatible `id` field.
+- **UI field mapping** — derived from the DTO shapes in api.dsl, not from domain
+attributes directly. The Create form uses `DTO.<Entity>Create` fields; the Edit form
+uses `DTO.<Entity>Update` fields; List and Show use `DTO.<Entity>` fields.
+
--- a/domain/toir.api.dsl
+++ b/domain/toir.api.dsl
@@ -0,0 +1,90 @@
+enum EquipmentStatus {
+  value Active {
+    label "В эксплуатации";
+  }
+  value Repair {
+    label "В ремонте";
+  }
+  value Reserve {
+    label "В резерве";
+  }
+  value WriteOff {
+    label "Списано";
+  }
+}
+
+// Оборудование
+
+entity Equipment {
+  description "Единица оборудования — объект ремонта и технического обслуживания";
+
+  attribute id {
+    type uuid;
+    key primary;
+  }
+
+  attribute name {
+    description "Название оборудования";
+    is required;
+    type string;
+  }
+
+  attribute serialNumber {
+    description "Заводской (серийный) номер";
+    type string;
+    is required;
+  }
+
+  attribute dateOfInspection {
+    description "Дата поверки";
+    type date;
+  }
+
+  attribute commissionedAt {
+    description "Дата изготовления";
+    type date;
+  }
+
+  attribute status {
+    description "Текущий статус";
+    type EquipmentStatus;
+    default Active;
+    is required;
+  }
+
+}
+
+  // Документ изменения статуса оборудования — с характеристиками: дата события, ссылка на оборудование, новый статус, возможно ответственный  
+entity ChangeEquipmentStatus {
+  description "Документ изменения статуса оборудования";
+
+  attribute equipmentId {
+    description "Оборудование";
+    type Equipment;
+  }
+
+  attribute newStatus {
+    description "Новый статус";
+    type EquipmentStatus;
+    is required;
+    //sync Equipment.status;
+  }
+
+  attribute number {
+    description "Номер";
+    type string;
+  }
+
+  attribute date {
+    description "Дата изменения статуса";
+    is required;
+    type date;
+  }
+
+  attribute responsible {
+    description "Ответственный";
+    type string;
+  }
+  
+}
+