# Delete trailing chat messages

Source: https://docs.recoupable.dev/api-reference/chat/messages-trailing-delete

Delete a message in a Workflow chat and every message after it, ordered by created_at then id.

## DELETE /api/chats/{id}/messages/trailing

Full OpenAPI specification: https://docs.recoupable.dev/spec/research.json

## Authentication

This operation requires one of the security alternatives in the specification below. Security scheme definitions are included where present in the published specification.

[Authentication guide](https://docs.recoupable.dev/authentication)

## Operation and referenced schemas

```json
{
  "openapi": "3.1.0",
  "info": {
    "title": "Recoup API - Research",
    "description": "API documentation for the Recoup platform - an AI agent platform for the music industry",
    "license": {
      "name": "MIT"
    },
    "version": "1.0.0"
  },
  "servers": [
    {
      "url": "https://api.recoupable.dev"
    }
  ],
  "paths": {
    "/api/chats/{id}/messages/trailing": {
      "delete": {
        "operationId": "deleteChatsByIdMessagesTrailing",
        "description": "Delete a message in a Workflow chat and every message after it, ordered by `created_at` then `id`. Concurrent edit/resend is unsupported: stop other writers first, because an active workflow run returns `409`. `200` means the delete ran, possibly affecting zero rows; after a transport failure, refresh the chat history instead of resending.",
        "parameters": [
          {
            "name": "id",
            "in": "path",
            "description": "UUID of the owned Workflow chat.",
            "required": true,
            "schema": {
              "type": "string",
              "format": "uuid"
            }
          },
          {
            "name": "from_message_id",
            "in": "query",
            "description": "UUID of the persisted message in this Workflow chat to use as the inclusive created_at, id boundary. Any persisted message role is eligible.",
            "required": true,
            "schema": {
              "type": "string",
              "format": "uuid"
            }
          },
          {
            "name": "account_id",
            "in": "query",
            "required": false,
            "description": "Optional effective account override, accepted only when current authentication authorizes access to that account. It does not grant access by itself.",
            "schema": {
              "type": "string",
              "format": "uuid"
            }
          }
        ],
        "responses": {
          "200": {
            "description": "Delete statement succeeded, including a possible zero-row result. No deleted count, durable-absence or concurrent edit/resend guarantee.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/DeleteTrailingChatMessagesResponse"
                },
                "examples": {
                  "statementSuccess": {
                    "value": {
                      "status": "success",
                      "chat_id": "11111111-1111-4111-8111-111111111111",
                      "from_message_id": "22222222-2222-4222-8222-222222222222"
                    }
                  }
                }
              }
            }
          },
          "400": {
            "description": "Invalid chat UUID or missing/invalid from_message_id query UUID.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/DeleteTrailingChatMessagesErrorResponse"
                }
              }
            }
          },
          "401": {
            "description": "Missing, conflicting or invalid credentials. Authentication errors retain the error or message envelope returned by the selected authentication path.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/DeleteTrailingChatAuthenticationErrorResponse"
                }
              }
            }
          },
          "403": {
            "description": "Access denied to the requested account_id override or the effective account does not own the Workflow chat session.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/DeleteTrailingChatMessagesErrorResponse"
                }
              }
            }
          },
          "404": {
            "description": "Workflow chat/session is absent, or the anchor is absent from this chat (including a foreign-chat anchor).",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/DeleteTrailingChatMessagesErrorResponse"
                }
              }
            }
          },
          "409": {
            "description": "An occupied workflow slot was observed. Pending reservations and other nonnull values are rejected without provider calls, cancellation or slot mutation. This check is not a concurrency lock.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/DeleteTrailingChatMessagesErrorResponse"
                },
                "examples": {
                  "occupiedSlot": {
                    "value": {
                      "status": "error",
                      "error": "Chat has an active workflow reservation; retry after it clears"
                    }
                  }
                }
              }
            }
          },
          "500": {
            "description": "Authentication/storage failure, chat/session/anchor read failure, invalid stored boundary, or delete failure. A transport failure may leave the commit outcome unknown; refresh history before further action.",
            "content": {
              "application/json": {
                "schema": {
                  "$ref": "#/components/schemas/DeleteTrailingChatMessagesErrorResponse"
                }
              }
            }
          }
        },
        "security": [
          {
            "apiKeyAuth": []
          },
          {
            "bearerAuth": []
          }
        ]
      }
    }
  },
  "components": {
    "schemas": {
      "DeleteTrailingChatMessagesResponse": {
        "type": "object",
        "required": [
          "status",
          "chat_id",
          "from_message_id"
        ],
        "properties": {
          "status": {
            "type": "string",
            "enum": [
              "success"
            ],
            "description": "Status of the request",
            "example": "success"
          },
          "chat_id": {
            "type": "string",
            "format": "uuid",
            "description": "The chat UUID where deletion was applied."
          },
          "from_message_id": {
            "type": "string",
            "format": "uuid",
            "description": "The message UUID used as the trailing deletion boundary."
          }
        }
      },
      "DeleteTrailingChatMessagesErrorResponse": {
        "type": "object",
        "required": [
          "status",
          "error"
        ],
        "properties": {
          "status": {
            "type": "string",
            "enum": [
              "error"
            ],
            "description": "Status of the request"
          },
          "error": {
            "type": "string",
            "description": "Error message describing what went wrong."
          },
          "missing_fields": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "List of missing or invalid parameter fields (when validation fails)."
          }
        }
      },
      "DeleteTrailingChatAuthenticationErrorResponse": {
        "anyOf": [
          {
            "type": "object",
            "properties": {
              "status": {
                "description": "Always `error`.",
                "type": "string",
                "enum": [
                  "error"
                ]
              },
              "error": {
                "description": "Human-readable error message or documented error code.",
                "type": "string"
              }
            },
            "required": [
              "status",
              "error"
            ],
            "additionalProperties": {}
          },
          {
            "type": "object",
            "properties": {
              "status": {
                "description": "Always `error`.",
                "type": "string",
                "enum": [
                  "error"
                ]
              },
              "message": {
                "description": "Human-readable authentication error message.",
                "type": "string"
              }
            },
            "required": [
              "status",
              "message"
            ],
            "additionalProperties": {}
          }
        ]
      }
    },
    "securitySchemes": {
      "apiKeyAuth": {
        "type": "apiKey",
        "in": "header",
        "name": "x-api-key",
        "description": "Your Recoup API key. [Learn more](/quickstart#api-keys)."
      },
      "bearerAuth": {
        "type": "http",
        "scheme": "bearer"
      }
    }
  }
}
```