{
  "type": "object",
  "properties": {
    "backend_name": {
      "type": "string",
      "pattern": "^.+-custom$",
      "description": "backend name",
      "severity": "error"
    },
    "description": {
      "type": ["string", "null"],
      "description": "backend description"
    },
    "default_version": {
      "type": "string",
      "description": "default backend version"
    },
    "is_built_in": {
      "type": "boolean",
      "description": "is built-in backend"
    },
    "default_backend_param": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "default backend parameter"
    },
    "parameter_format": {
      "type": ["string", "null"],
      "enum": ["space", "equal", null],
      "description": "parameter output format: 'space' -> --key value, 'equal' -> --key=value"
    },
    "common_parameters": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "commonly used parameters shown as hints in deployment UI"
    },
    "default_run_command": {
      "type": ["string", "null"],
      "description": "default start command"
    },
    "default_env": {
      "type": "object",
      "additionalProperties": {
        "type": "string"
      },
      "description": "default environment variables"
    },
    "health_check_path": {
      "type": ["string", "null"],
      "description": "health check path"
    },
    "version_configs": {
      "type": "object",
      "patternProperties": {
        "^[a-zA-Z0-9._-]+$": {
          "type": "object",
          "properties": {
            "image_name": {
              "type": "string",
              "description": "image name"
            },
            "run_command": {
              "type": ["string", "null"],
              "description": "start command"
            },
            "entrypoint": {
              "type": "string",
              "description": "Override the default ENTRYPOINT of the image"
            },
            "custom_framework": {
              "type": ["string", "null"],
              "description": "custom framework"
            },
            "env": {
              "type": "object",
              "additionalProperties": {
                "type": "string"
              },
              "description": "environment variables"
            }
          },
          "required": ["image_name", "run_command"],
          "additionalProperties": false
        }
      },
      "additionalProperties": false,
      "description": "multiple backend versions"
    },
    "built_in_version_configs": {
      "type": "object",
      "patternProperties": {
        "^[a-zA-Z0-9._-]+$": {
          "type": "object",
          "properties": {
            "image_name": {
              "type": "string",
              "description": "image name"
            },
            "run_command": {
              "type": ["string", "null"],
              "description": "start command"
            },
            "entrypoint": {
              "type": "string",
              "description": "Override the default ENTRYPOINT of the image"
            },
            "custom_framework": {
              "type": ["string", "null"],
              "description": "custom framework"
            },
            "built_in_frameworks": {
              "type": "array",
              "items": {
                "type": "string"
              },
              "description": "built-in frameworks"
            }
          },
          "required": ["image_name", "run_command"],
          "additionalProperties": false
        }
      },
      "additionalProperties": false,
      "description": "multiple backend versions"
    },
    "framework_index_map": {
      "type": "object",
      "patternProperties": {
        "^[a-zA-Z0-9._-]+$": {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      },
      "additionalProperties": false,
      "description": "framework to version mapping"
    }
  },
  "required": ["backend_name", "default_version", "version_configs"],
  "additionalProperties": false
}