Both Testcontainers Postgres ITs were asserting exact counts on rows that
other classes in the shared context had already written.
- FlywayMigrationIT: treat the non-seed tables (users, server_config,
audit_log, application_config, app_settings) as "must exist; COUNT must
return a non-negative integer" rather than expecting exactly 0. The
seeded tables (roles=4, groups=1) still assert exact V1 baseline.
- ConfigEnvIsolationIT.findByEnvironment_excludesOtherEnvs: use unique
prefixed app slugs and switch containsExactlyInAnyOrder to contains +
doesNotContain, so the cross-env filter is still verified without
coupling to other tests' inserts.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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