Initial Claude implementation

app/models/associations.py

@@ -0,0 +1,18 @@
+"""Many-to-many association tables for RBAC."""
+from sqlalchemy import Column, ForeignKey, Table
+
+from app.core.database import Base
+
+user_roles = Table(
+    "user_roles",
+    Base.metadata,
+    Column("user_id", ForeignKey("users.id", ondelete="CASCADE"), primary_key=True),
+    Column("role_id", ForeignKey("roles.id", ondelete="CASCADE"), primary_key=True),
+)
+
+role_permissions = Table(
+    "role_permissions",
+    Base.metadata,
+    Column("role_id", ForeignKey("roles.id", ondelete="CASCADE"), primary_key=True),
+    Column("permission_id", ForeignKey("permissions.id", ondelete="CASCADE"), primary_key=True),
+)