Add altinity-expert-clickhouse-security skill#6
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A standalone, read-only ClickHouse security audit skill using progressive disclosure: a lean SKILL.md routes to 20 reference files loaded on demand. Coverage: scope/safety + redaction, identity/auth, RBAC/grants, definer & impersonation, network/TLS, table functions & external sources, table engines, row/column policy, settings profiles/constraints/quotas, audit logging, query-log threat hunting, secrets/named collections, password-hash hygiene, version-specific behavior, cluster/distributed, Keeper & interserver, executable UDFs, encryption at rest & backups, HTTP interface surface, and reporting/severity. Severity model emphasizes correlation over single-setting flags: reproducible (query-based) evidence only, host-ACL reachability gating, authority decided by RBAC grants (not readonly), no double-counting of ALL-implied privileges, identity dedup, expected-service-account handling, and the three-part secret-display gate. Also adds a read-only test (dbschema/scenarios/post.sql/prompt/expected) wired into the Makefile (test-security, test-all) and documents the skill in the README. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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A standalone, read-only ClickHouse security audit skill using progressive disclosure: a lean SKILL.md routes to 20 reference files loaded on demand.
Coverage: scope/safety + redaction, identity/auth, RBAC/grants, definer & impersonation, network/TLS, table functions & external sources, table engines, row/column policy, settings profiles/constraints/quotas, audit logging, query-log threat hunting, secrets/named collections, password-hash hygiene, version-specific behavior, cluster/distributed, Keeper & interserver, executable UDFs, encryption at rest & backups, HTTP interface surface, and reporting/severity.
Severity model emphasizes correlation over single-setting flags: reproducible (query-based) evidence only, host-ACL reachability gating, authority decided by RBAC grants (not readonly), no double-counting of ALL-implied privileges, identity dedup, expected-service-account handling, and the three-part secret-display gate.
Also adds a read-only test (dbschema/scenarios/post.sql/prompt/expected) wired into the Makefile (test-security, test-all) and documents the skill in the README.