# Get an object's change timeline

`GET /ledger/v1/catalogs/{catalog_id}/objects/{public_id}/timeline`

Fetch the change-history timeline of a single object by its public ID.

Entries are ordered newest first.

`public_id` is the object's canonical, typed id — `<type>/<value>` — and is passed
as-is, slash included. The window runs from `date_from` (inclusive) to now; omitting it
returns the full retained timeline.

Requires a read grant on the catalog named in the path; a token granted on another
catalog cannot read this one.

## Request example

```bash
curl --request GET \
  --url 'https://api.eu1.luigisbox.ai/ledger/v1/catalogs/<catalog_id>/objects/<public_id>/timeline' \
  --header 'Authorization: Bearer <access_token>'
```

## Path Parameters

| Name | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `catalog_id` | `string` | Yes | Catalog Id | — |
| `public_id` | `string` | Yes | Public Id | — |

## Query Parameters

| Name | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `date_from` | `anyOf(string, null)` | No | Date From | — |

## Responses

| Status | Description | Content |
|---|---|---|
| `200` | Successful Response | application/json: object |
| `401` | Missing or invalid credentials | application/json: object |
| `403` | Authenticated but not permitted | application/json: object |
| `422` | Request validation failed | application/json: object |

### 200

Successful Response

#### application/json

Schema: `object`

##### Attributes

| Attribute | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `catalog_id` | `string` | Yes | Catalog Id | — |
| `entries` | `Array<object>` | Yes | Entries | — |
| `entries[].event_id` | `string` | Yes | Event Id | — |
| `entries[].operation` | `string` | Yes | The kind of change recorded on the timeline. | allowed values: update, partial_update, delete |
| `entries[].payload` | `object` | Yes | Payload | — |
| `entries[].payload.*` | `any` | No | Additional property. | — |
| `entries[].source_system` | `string` | Yes | Source System | — |
| `entries[].status` | `string` | Yes | Whether a change has been confirmed applied. | allowed values: acked, pending |
| `entries[].timestamp` | `string` | Yes | Timestamp | format: date-time |
| `identity` | `string` | Yes | Identity | — |
| `window` | `object` | Yes | The time window the timeline covers. | — |
| `window.date_from` | `string` | Yes | Date From | format: date-time |
| `window.to` | `string` | No | To | allowed value: now |

##### Response example

```json
{
  "catalog_id": "example",
  "entries": [
    {
      "event_id": "example",
      "operation": "update",
      "payload": {},
      "source_system": "example",
      "status": "acked",
      "timestamp": "2026-04-15T12:00:00Z"
    }
  ],
  "identity": "example",
  "window": {
    "date_from": "2026-04-15T12:00:00Z",
    "to": "now"
  }
}
```

### 401

Missing or invalid credentials

#### application/json

Schema: `object`

##### Attributes

| Attribute | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `exception_details` | `object` | No | Machine-readable error context; empty object when there is nothing to add. | — |
| `exception_details.validation_errors` | `anyOf(Array<object>, null)` | No | Every field-level problem found in the request, when validation is what failed. Absent when the rejection is not about a specific value. | — |
| `exception_details.validation_errors[].loc` | `Array<anyOf(string, integer)>` | Yes | Path to the offending value from the request root, e.g. `["body", "filters", 0, "operator"]`. | — |
| `exception_details.validation_errors[].msg` | `string` | Yes | What is wrong with the value at `loc`. | — |
| `exception_details.validation_errors[].type` | `string` | Yes | Stable machine code for the problem, e.g. `missing` or `string_too_short`. | — |
| `exception_details.*` | `any` | No | Additional property. | — |
| `reason` | `string` | Yes | Human-readable, actionable error message. | — |
| `request_id` | `anyOf(string, null)` | No | Request correlation ID (matches the X-Request-Id response header). | — |

##### Response example

```json
{
  "exception_details": {
    "validation_errors": [
      {
        "loc": [
          "example"
        ],
        "msg": "example",
        "type": "example"
      }
    ]
  },
  "reason": "example",
  "request_id": "example"
}
```

### 403

Authenticated but not permitted

#### application/json

Schema: `object`

##### Attributes

| Attribute | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `exception_details` | `object` | No | Machine-readable error context; empty object when there is nothing to add. | — |
| `exception_details.validation_errors` | `anyOf(Array<object>, null)` | No | Every field-level problem found in the request, when validation is what failed. Absent when the rejection is not about a specific value. | — |
| `exception_details.validation_errors[].loc` | `Array<anyOf(string, integer)>` | Yes | Path to the offending value from the request root, e.g. `["body", "filters", 0, "operator"]`. | — |
| `exception_details.validation_errors[].msg` | `string` | Yes | What is wrong with the value at `loc`. | — |
| `exception_details.validation_errors[].type` | `string` | Yes | Stable machine code for the problem, e.g. `missing` or `string_too_short`. | — |
| `exception_details.*` | `any` | No | Additional property. | — |
| `reason` | `string` | Yes | Human-readable, actionable error message. | — |
| `request_id` | `anyOf(string, null)` | No | Request correlation ID (matches the X-Request-Id response header). | — |

##### Response example

```json
{
  "exception_details": {
    "validation_errors": [
      {
        "loc": [
          "example"
        ],
        "msg": "example",
        "type": "example"
      }
    ]
  },
  "reason": "example",
  "request_id": "example"
}
```

### 422

Request validation failed

#### application/json

Schema: `object`

##### Attributes

| Attribute | Type | Required | Description | Constraints |
|---|---|---|---|---|
| `exception_details` | `object` | No | Machine-readable error context; empty object when there is nothing to add. | — |
| `exception_details.validation_errors` | `anyOf(Array<object>, null)` | No | Every field-level problem found in the request, when validation is what failed. Absent when the rejection is not about a specific value. | — |
| `exception_details.validation_errors[].loc` | `Array<anyOf(string, integer)>` | Yes | Path to the offending value from the request root, e.g. `["body", "filters", 0, "operator"]`. | — |
| `exception_details.validation_errors[].msg` | `string` | Yes | What is wrong with the value at `loc`. | — |
| `exception_details.validation_errors[].type` | `string` | Yes | Stable machine code for the problem, e.g. `missing` or `string_too_short`. | — |
| `exception_details.*` | `any` | No | Additional property. | — |
| `reason` | `string` | Yes | Human-readable, actionable error message. | — |
| `request_id` | `anyOf(string, null)` | No | Request correlation ID (matches the X-Request-Id response header). | — |

##### Response example

```json
{
  "exception_details": {
    "validation_errors": [
      {
        "loc": [
          "example"
        ],
        "msg": "example",
        "type": "example"
      }
    ]
  },
  "reason": "example",
  "request_id": "example"
}
```