{
  "openapi": "3.0.3",
  "info": {
    "title": "Offline weekly forecast API",
    "version": "2.0.0",
    "description": "Two fixed saved-model backends: notebook (default) and legacy. No fitting during inference. GET returns the last successful POST globally."
  },
  "paths": {
    "/predict": {
      "post": {
        "requestBody": {
          "required": true,
          "content": {
            "multipart/form-data": {
              "schema": {
                "type": "object",
                "required": [
                  "sales",
                  "stock"
                ],
                "properties": {
                  "sales": {
                    "type": "string",
                    "format": "binary"
                  },
                  "stock": {
                    "type": "string",
                    "format": "binary"
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "Forecast CSV / JSON",
            "headers": {
              "X-Forecast-Model": {
                "description": "Actual backend used",
                "schema": {
                  "type": "string",
                  "enum": [
                    "notebook",
                    "legacy"
                  ]
                }
              },
              "X-Forecast-ID": {
                "description": "Hash of backend, code/model version and input files",
                "schema": {
                  "type": "string"
                }
              }
            }
          },
          "400": {
            "description": "Invalid request"
          },
          "404": {
            "description": "Unknown pair"
          },
          "409": {
            "description": "Requested forecast generation or model differs from the latest successful result"
          },
          "413": {
            "description": "Upload too large"
          },
          "422": {
            "description": "Invalid CSV/history"
          },
          "429": {
            "description": "Busy; Retry-After"
          },
          "503": {
            "description": "Forecast/model unavailable"
          },
          "504": {
            "description": "Inference interrupted/timed out; previous result preserved"
          }
        },
        "parameters": [
          {
            "name": "model",
            "in": "query",
            "required": false,
            "description": "POST: backend, default MODEL_BACKEND (notebook). GET: optional last-result identity check; mismatch returns 409.",
            "schema": {
              "type": "string",
              "enum": [
                "notebook",
                "legacy"
              ]
            }
          }
        ]
      },
      "get": {
        "parameters": [
          {
            "name": "article",
            "in": "query",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "warehouse",
            "in": "query",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "forecast_id",
            "in": "query",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "model",
            "in": "query",
            "required": false,
            "description": "POST: backend, default MODEL_BACKEND (notebook). GET: optional last-result identity check; mismatch returns 409.",
            "schema": {
              "type": "string",
              "enum": [
                "notebook",
                "legacy"
              ]
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Forecast CSV / JSON",
            "headers": {
              "X-Forecast-Model": {
                "description": "Actual backend used",
                "schema": {
                  "type": "string",
                  "enum": [
                    "notebook",
                    "legacy"
                  ]
                }
              },
              "X-Forecast-ID": {
                "description": "Hash of backend, code/model version and input files",
                "schema": {
                  "type": "string"
                }
              }
            }
          },
          "400": {
            "description": "Invalid request"
          },
          "404": {
            "description": "Unknown pair"
          },
          "409": {
            "description": "Requested forecast generation or model differs from the latest successful result"
          },
          "413": {
            "description": "Upload too large"
          },
          "422": {
            "description": "Invalid CSV/history"
          },
          "429": {
            "description": "Busy; Retry-After"
          },
          "503": {
            "description": "Forecast/model unavailable"
          },
          "504": {
            "description": "Inference interrupted/timed out; previous result preserved"
          }
        }
      }
    },
    "/predict/all": {
      "get": {
        "parameters": [
          {
            "name": "format",
            "in": "query",
            "schema": {
              "type": "string",
              "enum": [
                "csv",
                "json"
              ],
              "default": "csv"
            }
          },
          {
            "name": "forecast_id",
            "in": "query",
            "schema": {
              "type": "string"
            }
          },
          {
            "name": "model",
            "in": "query",
            "required": false,
            "description": "POST: backend, default MODEL_BACKEND (notebook). GET: optional last-result identity check; mismatch returns 409.",
            "schema": {
              "type": "string",
              "enum": [
                "notebook",
                "legacy"
              ]
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Forecast CSV / JSON",
            "headers": {
              "X-Forecast-Model": {
                "description": "Actual backend used",
                "schema": {
                  "type": "string",
                  "enum": [
                    "notebook",
                    "legacy"
                  ]
                }
              },
              "X-Forecast-ID": {
                "description": "Hash of backend, code/model version and input files",
                "schema": {
                  "type": "string"
                }
              }
            }
          },
          "400": {
            "description": "Invalid request"
          },
          "404": {
            "description": "Unknown pair"
          },
          "409": {
            "description": "Requested forecast generation or model differs from the latest successful result"
          },
          "413": {
            "description": "Upload too large"
          },
          "422": {
            "description": "Invalid CSV/history"
          },
          "429": {
            "description": "Busy; Retry-After"
          },
          "503": {
            "description": "Forecast/model unavailable"
          },
          "504": {
            "description": "Inference interrupted/timed out; previous result preserved"
          }
        }
      }
    },
    "/healthz": {
      "get": {
        "responses": {
          "200": {
            "description": "Model ready; forecast availability is a separate field"
          },
          "503": {
            "description": "Model unavailable"
          }
        }
      }
    }
  }
}