diff --git a/schema/mysql-changes/upgrade_25.sql b/schema/mysql-changes/upgrade_25.sql
new file mode 100644
index 00000000..f4d2d90b
--- /dev/null
+++ b/schema/mysql-changes/upgrade_25.sql
@@ -0,0 +1,2 @@
+ALTER TABLE import_source ADD COLUMN key_column VARCHAR(64) NOT NULL AFTER source_name;
+ALTER TABLE import_source ADD INDEX search_idx (key_column);
diff --git a/schema/mysql.sql b/schema/mysql.sql
index 58fd15a9..98fed078 100644
--- a/schema/mysql.sql
+++ b/schema/mysql.sql
@@ -805,8 +805,10 @@ CREATE TABLE icinga_usergroup_parent (
 CREATE TABLE import_source (
   id INT(10) UNSIGNED AUTO_INCREMENT NOT NULL,
   source_name VARCHAR(64) NOT NULL,
+  key_column VARCHAR(64) NOT NULL,
   provider_class VARCHAR(72) NOT NULL,
-  PRIMARY KEY (id)
+  PRIMARY KEY (id),
+  INDEX search_idx (key_column)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
 CREATE TABLE import_source_setting (