Add indices for tx_to and tx_from (#112)

db/migrations/1513805096_tx_to_index.down.sql

@@ -0,0 +1 @@
+DROP INDEX tx_to_index;

db/migrations/1513805096_tx_to_index.up.sql

@@ -0,0 +1 @@
+CREATE INDEX tx_to_index ON transactions(tx_to);

db/migrations/1513805100_tx_from_index.down.sql

@@ -0,0 +1 @@
+DROP INDEX tx_from_index;

db/migrations/1513805100_tx_from_index.up.sql

@@ -0,0 +1 @@
+CREATE INDEX tx_from_index ON transactions(tx_from);

db/schema.sql

@@ -353,6 +353,20 @@ CREATE INDEX block_number_index ON blocks USING btree (block_number);
 CREATE INDEX node_id_index ON blocks USING btree (node_id);
 
 
+--
+-- Name: tx_from_index; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE INDEX tx_from_index ON transactions USING btree (tx_from);
+
+
+--
+-- Name: tx_to_index; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE INDEX tx_to_index ON transactions USING btree (tx_to);
+
+
 --
 -- Name: transactions blocks_fk; Type: FK CONSTRAINT; Schema: public; Owner: -
 --