curl --request GET \
  --url https://api.mixpeek.com/v1/retrievers/{retriever_identifier} \
  --header 'Authorization: Bearer <token>'

{
  "retriever_id": "<string>",
  "retriever_name": "<string>",
  "description": "<string>",
  "input_schema": {
    "properties": {}
  },
  "collection_ids": [
    "<string>"
  ],
  "stages": [
    {
      "stage_name": "<string>",
      "version": "<string>",
      "parameters": {},
      "pre_filters": {
        "AND": [
          {
            "field": "name",
            "operator": "eq",
            "value": "John"
          },
          {
            "field": "age",
            "operator": "gte",
            "value": 30
          }
        ],
        "OR": [
          {
            "field": "status",
            "operator": "eq",
            "value": "active"
          },
          {
            "field": "role",
            "operator": "eq",
            "value": "admin"
          }
        ],
        "NOT": [
          {
            "field": "department",
            "operator": "eq",
            "value": "HR"
          },
          {
            "field": "location",
            "operator": "eq",
            "value": "remote"
          }
        ],
        "case_sensitive": true
      },
      "post_filters": {
        "AND": [
          {
            "field": "name",
            "operator": "eq",
            "value": "John"
          },
          {
            "field": "age",
            "operator": "gte",
            "value": 30
          }
        ],
        "OR": [
          {
            "field": "status",
            "operator": "eq",
            "value": "active"
          },
          {
            "field": "role",
            "operator": "eq",
            "value": "admin"
          }
        ],
        "NOT": [
          {
            "field": "department",
            "operator": "eq",
            "value": "HR"
          },
          {
            "field": "location",
            "operator": "eq",
            "value": "remote"
          }
        ],
        "case_sensitive": true
      },
      "stats": {
        "avg_execution_ms": 0,
        "execution_count": 0,
        "error_count": 0,
        "last_executed_at": "2023-11-07T05:31:56Z"
      }
    }
  ],
  "cache_config": {
    "enabled": true,
    "ttl_seconds": 3600,
    "stage": "retrieval",
    "exclude_fields": [
      "<string>"
    ],
    "stats": {
      "hit_count": 0,
      "miss_count": 0,
      "hit_rate": 0,
      "size_bytes": 0,
      "entry_count": 0,
      "last_invalidated_at": "2023-11-07T05:31:56Z"
    }
  },
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "last_executed_at": "2023-11-07T05:31:56Z",
  "enabled": true,
  "status": "active",
  "usage_stats": {
    "total_queries": 0,
    "queries_last_24h": 0,
    "avg_latency_ms": 0,
    "error_rate": 0,
    "last_error": "<string>",
    "cache_hit_rate": 0.5
  },
  "collections": [
    {
      "collection_id": "<string>",
      "collection_name": "<string>",
      "document_count": 123,
      "enabled": true,
      "last_indexed_at": "2023-11-07T05:31:56Z"
    }
  ],
  "metadata": {},
  "tags": [
    "<string>"
  ],
  "created_by": {
    "user_id": "<string>",
    "email": "<string>",
    "name": "<string>"
  },
  "updated_by": {
    "user_id": "<string>",
    "email": "<string>",
    "name": "<string>"
  },
  "version": 1,
  "revision_history": [
    {
      "version": 123,
      "updated_at": "2023-11-07T05:31:56Z",
      "updated_by": "<string>",
      "changes": "<string>"
    }
  ],
  "health": {
    "status": "healthy",
    "last_check": "2023-11-07T05:31:56Z",
    "issues": [
      "<string>"
    ]
  }
}