add cache back in

apps/cic-cache/cic_cache/db/models/base.py

@@ -0,0 +1,48 @@
+# third-party imports
+from sqlalchemy import Column, Integer
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+Model = declarative_base(name='Model')
+
+
+class SessionBase(Model):
+    __abstract__ = True
+ 
+    id = Column(Integer, primary_key=True)
+
+    engine = None
+    query = None
+    sessionmaker = None
+
+
+    @staticmethod
+    def create_session():
+        #SessionBase.session = session()
+        #return SessionBase.session
+        return SessionBase.sessionmaker()
+
+
+    @staticmethod
+    def _set_engine(engine):
+        SessionBase.engine = engine
+        SessionBase.sessionmaker = sessionmaker(bind=SessionBase.engine)
+
+
+    @staticmethod
+    def build():
+        Model.metadata.create_all(bind=SessionBase.engine)
+
+
+    @staticmethod
+    def connect(dsn):
+        e = create_engine(dsn)
+        SessionBase._set_engine(e)
+
+
+    @staticmethod
+    def disconnect():
+        SessionBase.engine.dispose()
+        SessionBase.session = None
+        SessionBase.engine = None