aurweb.db: add commit(), add() and autocommit arg

With the addition of these two, some code has been swapped
to use these in some of the other db wrappers with an additional
autocommit kwarg in create and delete, to control batch
transactions.

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/db.py

@@ -59,24 +59,35 @@ def query(model, *args, **kwargs):
     return session.query(model).filter(*args, **kwargs)
 
 
-def create(model, *args, **kwargs):
+def create(model, autocommit: bool = True, *args, **kwargs):
     instance = model(*args, **kwargs)
-    session.add(instance)
-    session.commit()
+    add(instance)
+    if autocommit is True:
+        commit()
     return instance
 
 
-def delete(model, *args, **kwargs):
+def delete(model, *args, autocommit: bool = True, **kwargs):
     instance = session.query(model).filter(*args, **kwargs)
     for record in instance:
         session.delete(record)
-    session.commit()
+    if autocommit is True:
+        commit()
 
 
 def rollback():
     session.rollback()
 
 
+def add(model):
+    session.add(model)
+    return model
+
+
+def commit():
+    session.commit()
+
+
 def get_sqlalchemy_url():
     """
     Build an SQLAlchemy for use with create_engine based on the aurweb configuration.