Perfomance: Preallocate slices (#61580)

pkg/services/sqlstore/migrations/accesscontrol/action_migrator.go

@@ -54,7 +54,8 @@ func (m *actionNameMigrator) migrateActionNames() error {
 		"alert.rules:update":       accesscontrol.ActionAlertingRuleUpdate,
 	}
 
-	var oldActionNames, newActionNames []interface{}
+	oldActionNames := make([]interface{}, 0, len(actionNameMapping))
+	newActionNames := make([]interface{}, 0, len(actionNameMapping))
 	for oldName, newName := range actionNameMapping {
 		oldActionNames = append(oldActionNames, oldName)
 		newActionNames = append(newActionNames, newName)

pkg/services/sqlstore/migrations/accesscontrol/team_membership.go

@@ -47,7 +47,7 @@ func (p *teamPermissionMigrator) setRolePermissions(roleID int64, permissions []
 	}
 
 	// Then insert new permissions
-	var newPermissions []accesscontrol.Permission
+	newPermissions := make([]accesscontrol.Permission, 0, len(permissions))
 	now := time.Now()
 	for _, permission := range permissions {
 		permission.RoleID = roleID