#session-autocommit

SQLAlchemy 2.0 removes Session autocommit parameter, forcing explicit transaction boundaries in legacy code

SQLAlchemy 2.0 eliminates the autocommit parameter from both Session and Connection , replacing implicit transaction behavior with explicit begin() and commit() calls. For codebases upgrading from 1.4, this creates a compatibility boundary where legacy ORM queries that previously persisted changes automatically now require deliberate transaction management.