Replace manual `new PostgresDeploymentRepository(jdbcTemplate, new ObjectMapper())` with `@Autowired PostgresDeploymentRepository repository` to use the Spring-managed bean whose ObjectMapper has JavaTimeModule registered. Also removes the redundant isNotNull() assertion whose work is done by the field-level assertions that follow. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>