Add DB migration to create transfers table

alembic/versions/cd96af55108e_add_transfers_table.py

@@ -0,0 +1,39 @@
+"""Add transfers table
+
+Revision ID: cd96af55108e
+Revises: 5437dc68f4df
+Create Date: 2021-09-17 12:44:45.245137
+
+"""
+import sqlalchemy as sa
+from alembic import op
+
+
+# revision identifiers, used by Alembic.
+revision = "cd96af55108e"
+down_revision = "320e56b0a99f"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_table(
+        "transfers",
+        sa.Column("created_at", sa.TIMESTAMP, server_default=sa.func.now()),
+        sa.Column("block_number", sa.Numeric, nullable=False),
+        sa.Column("transaction_hash", sa.String(66), nullable=False),
+        sa.Column("trace_address", sa.String(256), nullable=False),
+        sa.Column("protocol", sa.String(256), nullable=True),
+        sa.Column("from_address", sa.String(256), nullable=False),
+        sa.Column("to_address", sa.String(256), nullable=False),
+        sa.Column("token_address", sa.String(256), nullable=False),
+        sa.Column("amount", sa.Numeric, nullable=False),
+        sa.Column("error", sa.String(256), nullable=True),
+        sa.PrimaryKeyConstraint("transaction_hash", "trace_address"),
+    )
+    op.create_index("ix_transfers_block_number", "transfers", ["block_number"])
+
+
+def downgrade():
+    op.drop_index("ix_transfers_block_number", "transfers")
+    op.drop_table("transfers")