The test was failing intermittently when run with -race flag due to a race
condition between:
1. CertificateService constructor spawning a background goroutine that
immediately queries the database
2. The test's HTTP request handler also querying the database
On CI runners, the timing window is wider than on local machines, causing
frequent failures. Solution: Add a 200ms sleep to allow the background
goroutine to complete its initial sync before the test proceeds.
This is acceptable in test code as it mirrors real-world usage where the
service initializes before receiving HTTP requests.
Fixes intermittent failure:
Error: Not equal: expected: 200, actual: 500
no such table: ssl_certificates
fc263e7afb