Commit a8934514 authored by Lars Kruse's avatar Lars Kruse
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fix(database): use the request-based database sessions provided by flask-sqlalchemy

Currently the database session is created during application startup and
is used in all threads.  This is problematic, since the session is not
thread-safe.
Now we use the request-based database session provided by
flask-sqlachemy instead.

But this does not really solve the problem of using the same session in
different threads, since the threads are started within a request.
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