chore: perform migration to allow null entries in table (#45)

aggregator/alembic/versions/7c002818cb32_allow_null_in_offline_sessions.py

@@ -0,0 +1,24 @@
+"""allow null in offline sessions
+
+Revision ID: 7c002818cb32
+Revises: 5bfc2a71a71f
+Create Date: 2024-07-29 16:29:07.464223
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '7c002818cb32'
+down_revision = '5bfc2a71a71f'
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.alter_column('client_sessions','offline_sessions', existing_type=sa.INTEGER(), nullable=True)
+
+
+def downgrade() -> None:
+    op.alter_column('client_sessions','offline_sessions', existing_type=sa.INTEGER(), nullable=False)