Migrations: Make sure users uid are set (#104996)

* Migrations: Make sure default admin has a uid

* Account for all users not only id 1

* Add spanner

* Wrong migration to add spanner

* Fix spanner mig

pkg/services/sqlstore/migrations/user_mig.go

@@ -151,6 +151,12 @@ func addUserMigrations(mg *Migrator) {
 		Postgres("UPDATE `user` SET uid='u' || lpad('' || id::text,9,'0') WHERE uid IS NULL;").
 		Mysql("UPDATE user SET uid=concat('u',lpad(id,9,'0')) WHERE uid IS NULL;"))
 
+	mg.AddMigration("Make sure users uid are set", NewRawSQLMigration("").
+		SQLite("UPDATE user SET uid=printf('u%09d',id) WHERE uid is NULL OR uid = '';").
+		Postgres("UPDATE `user` SET uid='u' || lpad('' || id::text,9,'0') WHERE uid is NULL OR uid = '';").
+		Mysql("UPDATE user SET uid=concat('u',lpad(id,9,'0')) WHERE uid is NULL OR uid = '';").
+		Spanner("UPDATE user SET uid=concat('u',lpad(CAST(id AS STRING),9,'0')) WHERE uid IS NULL OR uid = '';"))
+
 	mg.AddMigration("Add unique index user_uid", NewAddIndexMigration(userV2, &Index{
 		Cols: []string{"uid"}, Type: UniqueIndex,
 	}))