Row-Level Security Policy Generator

Set up Row-Level Security (RLS) for:

**Tables:** [TABLES — e.g., "projects, tasks, comments, files"]
**Roles:** [ROLES — e.g., "admin (full access), manager (team access), member (own data only)"]
**Tenant model:** [MODEL — e.g., "organization_id on every table", "team-based access"]

Generate:
1. **RLS policies** — SELECT, INSERT, UPDATE, DELETE policies for each table and role
2. **Current user context** — set session variable with authenticated user info
3. **Policy functions** — reusable security functions for common patterns
4. **Cascading access** — manager sees team data, admin sees everything
5. **Performance** — ensure policies use indexed columns, avoid sequential scans
6. **Testing** — queries to verify each role sees only authorized data
7. **Bypass** — service role for migrations and admin operations

Include the complete SQL for enabling RLS, creating policies, and test queries.