Update dependency sqlalchemy to v2.1.4 - #1178

Reviewer's Guide

The PR updates the backend’s pinned SQLAlchemy dependency from 2.1.1 to 2.1.2, with no other implementation changes shown.

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@@           Coverage Diff           @@
##             main    #1178   +/-   ##
=======================================
  Coverage   87.34%   87.34%           
=======================================
  Files          63       63           
  Lines        3754     3754           
  Branches      700      700           
=======================================
  Hits         3279     3279           
  Misses        266      266           
  Partials      209      209           

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