Merge pull request #211 from costap/main

Adds index on transations table timestamp

internal/datastore/postgres/migrations/add_transaction_timestamp_index.go

@@ -0,0 +1,24 @@
+package migrations
+
+const createIndexOnTupleTransactionTimestamp = `
+	CREATE INDEX ix_relation_tuple_transaction_by_timestamp on relation_tuple_transaction(timestamp);
+`
+
+func init() {
+	if err := DatabaseMigrations.Register("add-transaction-timestamp-index", "add-unique-living-ns", func(apd *AlembicPostgresDriver) error {
+		tx, err := apd.db.Beginx()
+		if err != nil {
+			return err
+		}
+		defer tx.Rollback()
+
+		_, err = tx.Exec(createIndexOnTupleTransactionTimestamp)
+		if err != nil {
+			return err
+		}
+
+		return tx.Commit()
+	}); err != nil {
+		panic("failed to register migration: " + err.Error())
+	}
+}