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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>