> ## 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.

# E2311

> Parquet target — Block-number column is optional

The block-number column is declared `optional`, but finalization, file-range naming, and crash
recovery all key off it — a null coerces to an immutable block-0 row.

**Fix** — declare the block-number column required (remove `optional`).