feat: add SQLAlchemy storage adapter

requirements.txt

@@ -22,12 +22,13 @@ pytest-timeout>=2.2.0       # Test timeout protection
 # Optional storage backends
 # Uncomment as needed:
 
-# PostgreSQL
-# sqlalchemy>=2.0.0
+# SQLite / PostgreSQL / MySQL (SQLAlchemy adapter)
+sqlalchemy>=2.0.0
+
+# PostgreSQL driver
 # psycopg2-binary>=2.9.0
 
-# MySQL
-# sqlalchemy>=2.0.0
+# MySQL driver
 # pymysql>=1.0.0
 
 # Redis (caching)

src/rbac/storage/__init__.py

@@ -2,9 +2,19 @@
 
 This module contains storage provider implementations that follow the
 IStorageProvider protocol defined in core.protocols.
+
+Available backends:
+    - :class:`MemoryStorage`      – in-process dict storage (dev/test)
+    - :class:`SQLAlchemyStorage`  – SQL-backed storage (SQLite, PostgreSQL, MySQL)
 """
 
 from .base import BaseStorage
 from .memory import MemoryStorage
 
-__all__ = ['BaseStorage', 'MemoryStorage']
+try:
+    from .sqlalchemy_adapter import SQLAlchemyStorage
+    _SQLALCHEMY_AVAILABLE = True
+except ImportError:
+    _SQLALCHEMY_AVAILABLE = False
+
+__all__ = ['BaseStorage', 'MemoryStorage', 'SQLAlchemyStorage']