# Creation of the new schema rule

**`POST /api/v1/schema-rules`**

Creates a new schema rule.

**Authentication:** Bearer token required (`Authorization: Bearer <token>`)

**Permission:** `Permissions.SCHEMAS_RULE_CREATE`

***

## Request

### Request Body

```json
{
  "name": "MRV Data Quality Rules",
  "description": "Validation rules for MRV schema fields",
  "policyId": "63e3e5e8a01b3c001234abcd",
  "policyTopicId": "0.0.4532001",
  "policyInstanceTopicId": "0.0.4532002",
  "config": {}
}
```

| Field                   | Type   | Required | Description                                  |
| ----------------------- | ------ | -------- | -------------------------------------------- |
| `name`                  | string | Yes      | Human-readable name for the rule             |
| `description`           | string | No       | Optional description of the rule             |
| `uuid`                  | string | No       | Rule UUID; auto-generated if omitted         |
| `policyId`              | string | No       | ID of the policy this rule is scoped to      |
| `policyTopicId`         | string | No       | Hedera topic ID of the associated policy     |
| `policyInstanceTopicId` | string | No       | Hedera topic ID of the policy instance       |
| `status`                | string | No       | Initial status; defaults to `DRAFT`          |
| `config`                | object | No       | Rule configuration (conditions, constraints) |

***

## Response

### Success Response

**Status:** `201 Created`

```json
{
  "id": "63e3e5e8a01b3c001234abcd",
  "uuid": "3b4e1c2d-5f6a-7890-abcd-ef1234567890",
  "name": "MRV Data Quality Rules",
  "description": "Validation rules for MRV schema fields",
  "creator": "did:hedera:testnet:zHcDLGFNymFAJiMBKnpbHDgjvTn6yZnwkPPeFhtJBECH_0.0.4532001",
  "owner": "did:hedera:testnet:zHcDLGFNymFAJiMBKnpbHDgjvTn6yZnwkPPeFhtJBECH_0.0.4532001",
  "policyId": "63e3e5e8a01b3c001234abcd",
  "policyTopicId": "0.0.4532001",
  "policyInstanceTopicId": "0.0.4532002",
  "status": "DRAFT",
  "config": {}
}
```

### Error Responses

| Status                      | Description                                        |
| --------------------------- | -------------------------------------------------- |
| `400 Bad Request`           | Malformed request body                             |
| `401 Unauthorized`          | Missing or invalid token                           |
| `403 Forbidden`             | Insufficient permissions                           |
| `422 Unprocessable Entity`  | Invalid configuration — body is empty or malformed |
| `500 Internal Server Error` | Unexpected server failure                          |


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