Add database migration

alembic/versions/0cef835f7b36_rename_pool_address_to_contract_address.py

@@ -0,0 +1,27 @@
+"""Rename pool_address to contract_address
+
+Revision ID: 0cef835f7b36
+Revises: 5427d62a2cc0
+Create Date: 2021-11-19 15:36:15.152622
+
+"""
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision = "0cef835f7b36"
+down_revision = "5427d62a2cc0"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.alter_column(
+        "swaps", "pool_address", nullable=False, new_column_name="contract_address"
+    )
+
+
+def downgrade():
+    op.alter_column(
+        "swaps", "contract_address", nullable=False, new_column_name="pool_address"
+    )