Tenant-scoped fallback ticket model for accounts without PSA integration. Tracks customer-name, problem-statement, status lifecycle (open/walking/ resolved/escalated), and optional links to flow/proposal/ai_session/ assigned engineer + PSA promotion ID. Account-scoped RLS policy uses app.current_account_id session setting. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>