Fixed migration failure while using external database. #7556

web/migrations/versions/ac2c2e27dc2d_.py

@@ -8,8 +8,8 @@ Create Date: 2024-05-17 19:35:03.700104
 """
 from alembic import op
 import sqlalchemy as sa
+from sqlalchemy.orm.session import Session
 from pgadmin.model import Preferences
-from pgadmin.model import db
 
 # revision identifiers, used by Alembic.
 revision = 'ac2c2e27dc2d'
@@ -19,9 +19,11 @@ depends_on = None
 
 
 def upgrade():
-    db.session.query(Preferences).filter(
+    session = Session(bind=op.get_bind())
+    
+    session.query(Preferences).filter(
             Preferences.name == 'execute_query').update({'name': 'execute_script'})
-    db.session.commit()
+    session.commit()
     
     meta = sa.MetaData()
     meta.reflect(op.get_bind(), only=('user_macros',))