diff --git a/sql-schema/109.sql b/sql-schema/109.sql
new file mode 100644
index 000000000..a6bca66b5
--- /dev/null
+++ b/sql-schema/109.sql
@@ -0,0 +1,5 @@
+CREATE TABLE tmp_table LIKE config;
+ALTER IGNORE TABLE tmp_table ADD UNIQUE INDEX uniqueindex_configname (config_name);
+INSERT IGNORE INTO tmp_table SELECT * FROM config;
+DROP TABLE config;
+RENAME TABLE tmp_table TO config;