- devices table: device_type (default 'routeros'), snmp_port (default 161), snmp_version, snmp_profile_id FK -> snmp_profiles, credential_profile_id FK -> credential_profiles, with lock_timeout = 3s for safe ALTER - snmp_metrics: hypertable with 90-day retention, composite index on (device_id, metric_name, time DESC), RLS with tenant isolation Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>