Add models dir

atst/models/types.py

@@ -0,0 +1,10 @@
+import sqlalchemy
+from sqlalchemy import Column
+from sqlalchemy.dialects.postgresql import UUID
+
+
+def Id():
+    return Column(
+        UUID(as_uuid=True),
+        primary_key=True,
+        server_default=sqlalchemy.text("uuid_generate_v4()"))