> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sqd.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Unfinalized blocks and reorgs

> How Squid SDK handles unfinalized blocks and reorgs.

The Tron processor can index blocks all the way to the current chain head, including blocks that have not yet been finalized. Real-time data requires an HTTP API data source - add one with [`setHttpApi()`](../../reference/tron-processor/general#set-http-api).

## Indexing unfinalized blocks

To index unfinalized ("hot") blocks and stay correct across chain reorganizations, a squid must use a [`Database`](../../reference/data-stores/store-interface) with hot block support (e.g. [`TypeormDatabase`](../writing-to-postgres)) in its `processor.run()` call, and not cap its block range below the chain head.

When a blockchain reorganization happens, the [processor](../../reference/tron-processor/general) rolls back any changes to the database made due to orphaned blocks, then re-runs its batch handler on consensus blocks, so that the state of the `Database` reflects the current chain consensus at all times.