Allow for multiple Geth nodes (#128)

db/migrations/1515613181_add_fields_to_node.down.sql

@@ -0,0 +1,3 @@
+ALTER TABLE nodes
+  DROP COLUMN node_id,
+  DROP COLUMN client_name;

db/migrations/1515613181_add_fields_to_node.up.sql

@@ -0,0 +1,3 @@
+ALTER TABLE nodes
+  ADD COLUMN node_id VARCHAR(128),
+  ADD COLUMN client_name VARCHAR;

db/migrations/1515613715_update_node_index.down.sql

@@ -0,0 +1,9 @@
+BEGIN;
+
+ALTER TABLE nodes
+  DROP CONSTRAINT node_uc;
+
+ALTER TABLE nodes
+  ADD CONSTRAINT node_uc UNIQUE (genesis_block, network_id);
+
+COMMIT;

db/migrations/1515613715_update_node_index.up.sql

@@ -0,0 +1,9 @@
+BEGIN;
+
+ALTER TABLE nodes
+  DROP CONSTRAINT node_uc;
+
+ALTER TABLE nodes
+  ADD CONSTRAINT node_uc UNIQUE (genesis_block, network_id, node_id);
+
+COMMIT;