Fix for #1564 - using memory database in multiple threads.
See also: https://docs.sqlalchemy.org/en/13/dialects/sqlite.html#using-a-memory-database-in-multiple-threads
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@ -32,6 +32,7 @@ from sqlalchemy import String, Integer, Boolean, TIMESTAMP, Float
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from sqlalchemy.orm import relationship, sessionmaker, scoped_session
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.exc import OperationalError
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from sqlalchemy.pool import StaticPool
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from flask_login import current_user
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from sqlalchemy.sql.expression import and_, true, false, text, func, or_
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from babel import Locale as LC
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@ -386,7 +387,8 @@ class CalibreDB(threading.Thread):
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self.engine = create_engine('sqlite://',
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echo=False,
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isolation_level="SERIALIZABLE",
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connect_args={'check_same_thread': False})
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connect_args={'check_same_thread': False},
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poolclass=StaticPool)
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self.engine.execute("attach database '{}' as calibre;".format(dbpath))
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self.engine.execute("attach database '{}' as app_settings;".format(app_db_path))
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