Added UNIQUE KEYS to fluview_clinical to avoid duplicates

Author: dmytrotsko

src/ddl/fluview.sql

@@ -269,6 +269,7 @@ CREATE TABLE `fluview_clinical` (
   `percent_a` double DEFAULT NULL,
   `percent_b` double DEFAULT NULL,
   PRIMARY KEY (`id`),
+  UNIQUE KEY `release_date_2` (`release_date`, `epiweek`, `region`),
   KEY `release_date` (`release_date`),
   KEY `issue` (`issue`),
   KEY `epiweek` (`epiweek`),