fix: No need to call the model to recommend problems during each session switch

Author: ziyujiahao

backend/alembic/versions/058_update_chat.py

@@ -0,0 +1,31 @@
+"""empty message
+
+Revision ID: fb2e8dd19158
+Revises: c431a0bf478b
+Create Date: 2025-12-29 17:18:49.072320
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'fb2e8dd19158'
+down_revision = 'c431a0bf478b'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.add_column('chat', sa.Column('recommended_question_answer', sa.TEXT(), nullable=True))
+    op.add_column('chat', sa.Column('recommended_question', sa.TEXT(), nullable=True))
+    op.add_column('chat', sa.Column('recommended_generate', sa.Boolean(),  nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    op.drop_column('chat', 'recommended_question_answer')
+    op.drop_column('chat', 'recommended_question')
+    op.drop_column('chat', 'recommended_generate')
+    # ### end Alembic commands ###