# Catchups Many times, there is a need to index historical data. In contract-centered development workflows, it's common to deploy the contract initially and ensure functionality before deploying the indexer. Recognizing this critical need, we've established a fast and efficient data catch-up infrastructure that generates artificial ledger transitions. This means you can build an event-based Zephyr program and still access past historical data for the events you request. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.mercurydata.app/zephyr-full-customization/general-concepts/catchups.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.