pool names are unique

src/charon/plugins/sql/sqlite.sql

@@ -155,15 +155,11 @@ CREATE TABLE shared_secret_identity (
 DROP TABLE IF EXISTS pools;
 CREATE TABLE pools (
   id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
-  name TEXT NOT NULL,
+  name TEXT NOT NULL UNIQUE,
   start BLOB NOT NULL,
   end BLOB NOT NULL,
   timeout INTEGER NOT NULL
 );
-DROP INDEX IF EXISTS pools_name;
-CREATE INDEX pools_name ON pools (
-  name
-);
 
 DROP TABLE IF EXISTS addresses;
 CREATE TABLE addresses (