Rerank

Rerank a list of item IDs for a given user using an AWS Personalize campaign.

This endpoint sends the user and items to a trained AWS Personalize model, which returns the same items in a personalized order based on predicted relevance.

Flow:

1. Provide user_id and item_ids in the request body
2. The service calls AWS Personalize get_personalized_ranking with the campaign ARN for the given model_name
3. Response returns the same item IDs in a new order (personalized ranking)

Available Models:

• polymarket-rerank-v1 — Polymarket reranking campaign trained on trading activity data

Error Handling: Errors are returned with HTTP 200 and an error field in the response body (rather than HTTP error codes). This includes:

• Missing user_id or item_ids
• Unknown model_name
• AWS errors (campaign not found, invalid input, network issues)