chore(deps): bump sqlalchemy[asyncio] from 2.0.30 to 2.0.48 in /backend

[dependabot]

Bumps sqlalchemy[asyncio] from 2.0.30 to 2.0.48.

Release notes

Sourced from sqlalchemy[asyncio]'s releases.

2.0.48

Released: March 2, 2026

engine

• [engine] [bug] Fixed a critical issue in Engine where connections created in conjunction with the DialectEvents.do_connect() event listeners would receive shared, mutable collections for the connection arguments, leading to a variety of potential issues including unlimited growth of the argument list as well as elements within the parameter dictionary being shared among concurrent connection calls. In particular this could impact do_connect routines making use of complex mutable authentication structures.

  References: #13144

2.0.47

Released: February 24, 2026

orm

• [orm] [bug] Fixed issue when using ORM mappings with Python 3.14's PEP 649 feature that no longer requires "future annotations", where the ORM's introspection of the __init__ method of mapped classes would fail if non-present identifiers in annotations were present. The vendored getfullargspec() method has been amended to use Format.FORWARDREF under Python 3.14 to prevent resolution of names that aren't present.

  References: #13104

engine

• [engine] [usecase] The connection object returned by _engine.Engine.raw_connection() now supports the context manager protocol, automatically returning the connection to the pool when exiting the context.

  References: #13116

postgresql

• [postgresql] [bug] Fixed an issue in the PostgreSQL dialect where foreign key constraint reflection would incorrectly swap or fail to capture onupdate and ondelete values when these clauses appeared in a different order than expected in the constraint definition. This issue primarily affected

... (truncated)

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