Add docstrings to db submodules

amanuensis/db/database.py

@@ -1,3 +1,6 @@
+"""
+Database connection setup
+"""
 from sqlalchemy import create_engine, MetaData, event
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import scoped_session

amanuensis/db/models.py

@@ -1,3 +1,6 @@
+"""
+Data model SQL definitions
+"""
 import enum
 from sqlalchemy import (
     Boolean,