Sourced from sqlalchemy's releases.

2.1.6

Released: October 21, 2026

orm

• [orm] [bug] Fixed issue where a Session flush that replaced an expired object in the identity map with a newly flushed object of the same primary key would emit a SELECT to refresh the expired object, solely in order to determine whether to emit an "Identity map already had an identity" warning. This could occur when a row loaded within a transaction is rolled back and its primary key value is subsequently reused, and could lead to an AttributeError if the expired object were garbage collected during that load. The check now emits no SQL, and an expired object that is replaced in this way no longer causes the warning to be emitted.

  This change is also backported to: 2.0.56

  References: #13711

• [orm] [bug] [regression] Fixed regression caused by #13070 where using more than one orm.with_loader_criteria() option for the same entity, where the criteria made use of correlated subqueries referring to that entity, would fail with a RecursionError when compiling.

  References: #13701

• [orm] [bug] [regression] Fixed regression caused by the new implementation of .params() for statements introduced in #7066, where parameter values passed to the .params() method of an ORM statement created using Select.from_statement() would not be applied when the statement was compiled without the compiled statement cache, such as when the cache was disabled or when the statement was stringified directly, leading to an error that a value is required for the bound parameter.

  References: #13709

orm extensions

• [bug] [orm extensions] Fixed an issue in the instrumentation_toplevel extension where unrelated classes inheriting from typing.Generic could incorrectly raise a TypeError when using different instrumentation implementations. Pull request courtesy TomasCaruso10.

  This change is also backported to: 2.0.56

  References: #13680

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