Hi,

I'm using SQLAlchemy's Core to interface a postgres database (via psycopg2) 
component alongside Flask-SQLAlchemy in a Flask app. Everything was working 
fine until I recently discovered what seems to be a deadlock state which is 
caused by two queries locking each other (at least that's my working 
hypothesis).

Postgres offers a wide range of locking mechanisms, so I wonder which one 
is used by SQLAlchemy (i.e. where is it set?).


This is how the database engine is being created (through Flask-SQLAlchemy.

```
db = sqlalchemy.create_engine(...)

# `db` reference is reused in process

# this is how queries are executed
rv = db.session.execute(select(...))
```

Is there any way I can check the transaction handling/locking used?

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