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backend/alembic/versions/031_modify_chat_record.py

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+"""031_modify_chat_record
+
+Revision ID: bd2ed188b5bd
+Revises: c1d7ac00b3a8
+Create Date: 2025-07-21 17:27:55.985821
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'bd2ed188b5bd'
+down_revision = 'c1d7ac00b3a8'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('chat_record', 'engine_type',
+               existing_type=sa.VARCHAR(length=64),
+               nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('chat_record', 'engine_type',
+               existing_type=sa.VARCHAR(length=64),
+               nullable=False)
+    # ### end Alembic commands ###