Add Block Miner

db/migrations/1514392444_add_miner.down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE blocks
+    DROP COLUMN block_miner;

db/migrations/1514392444_add_miner.up.sql

@@ -0,0 +1,2 @@
+ALTER TABLE blocks
+    ADD COLUMN block_miner VARCHAR(42);

db/schema.sql

@@ -51,7 +51,8 @@ CREATE TABLE blocks (
     block_size bigint,
     uncle_hash character varying(66),
     node_id integer NOT NULL,
-    is_final boolean
+    is_final boolean,
+    block_miner character varying(42)
 );