Function fetch_metadata_from_database 

pub fn fetch_metadata_from_database(
    url: &str,
    schema_filter: Option<String>,
) -> Result<SchemaMetadata>

Connect to a database and fetch its schema.

This is the main entry point for CLI usage.

Arguments

• url - Database connection URL
• schema_filter - Optional schema name to filter tables

Returns

The fetched schema metadata, or an error if connection/query fails.