Documents policy for all 5 existing background jobs: - Knowledge Flywheel and PSA Retry flagged for account_id threading - Chat Retention already follows correct pattern (model for others) - Maintenance Schedule Firing needs account_id in queries + Session creation - AI Conversation Expiry approved as cross-tenant with justification Adds approved cross-tenant query registry and Phase 2 checklist items. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Complete architecture plan for multi-tenant data isolation across all layers (PostgreSQL RLS, application-layer filtering, schema migration, testing strategy, and phased rollout checklist). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>