add init_db

harvester/db/schema.py

@@ -0,0 +1,10 @@
+from sqlalchemy import MetaData, create_engine
+from sqlalchemy.ext.declarative import declarative_base
+
+metadata = MetaData()
+Base = declarative_base(metadata=metadata)
+
+
+def init_db(engine_url):
+    engine = create_engine(engine_url)
+    Base.metadata.create_all(engine)