Detect when postgres is used instead of postgresql.

lib/queries.js

@@ -4,10 +4,15 @@ import { subMinutes } from 'date-fns';
 import { MYSQL, POSTGRESQL, MYSQL_DATE_FORMATS, POSTGRESQL_DATE_FORMATS } from 'lib/constants';
 
 export function getDatabase() {
-  return (
+  const type =
     process.env.DATABASE_TYPE ||
-    (process.env.DATABASE_URL && process.env.DATABASE_URL.split(':')[0])
-  );
+    (process.env.DATABASE_URL && process.env.DATABASE_URL.split(':')[0]);
+
+  if (type === 'postgres') {
+    return 'postgresql';
+  }
+
+  return type;
 }
 
 export function getDateQuery(db, field, unit, timezone) {