I am struggling to understand how to use session events. I want to track 
inserts&updates in some model and depending on certain criteria modify 
objects from other model. Judging from docs, I cannot use before_update and 
similar Mapper Events:
http://docs.sqlalchemy.org/en/latest/orm/events.html?highlight=before_flush#sqlalchemy.orm.events.MapperEvents.before_update
And from another place in that doc: "The user is encouraged to evaluate the 
SessionEvents.before_flush() 
<http://docs.sqlalchemy.org/en/latest/orm/events.html?highlight=before_flush#sqlalchemy.orm.events.SessionEvents.before_flush>
 and SessionEvents.after_flush() 
<http://docs.sqlalchemy.org/en/latest/orm/events.html?highlight=before_flush#sqlalchemy.orm.events.SessionEvents.after_flush>
 methods 
as more flexible and user-friendly hooks in which to apply additional 
database state during a flush"

However, docs for session events are very scarce. Are there any examples 
for using before_flush/after_flush events? For example in case of flush 
with single update operation, how can I access the object that was updated?

Many thanks,
Eugene

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