Function run_generate 

pub fn run_generate(
    registry: &SchemaRegistry,
    migrations_dir: &str,
    name: &str,
    dialect: Dialect,
) -> Result<Option<String>, DbCoreError>

Generates a migration file from the diff between the latest snapshot and the current schema.

Errors

Returns DbCoreError if reading/writing the snapshot, journal, or migration file fails.