Function ensure_schema 

pub async fn ensure_schema(
    pool: &PgPool,
    table_name: &str,
) -> Result<(), OutboxError>

Apply the canonical Postgres outbox schema to the target database.

Intended for POCs, integration tests and local development. Production deployments should run their own migration tooling against the SQL rendered by Dialect::schema_ddl. Applying DDL from the running application typically requires elevated privileges that the runtime role should not own, and clashes with versioned migration workflows.

Errors

• OutboxError::Internal if table_name is not a valid identifier.
• OutboxError::Database if the connection or the DDL statement fails.