Add database optimise task (#3929)

* Add database optimise task
* Wrap errors
* US internationalisation
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Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

internal/api/resolver_mutation_metadata.go

@@ -208,3 +208,8 @@ func (r *mutationResolver) AnonymiseDatabase(ctx context.Context, input Anonymis
 
 	return nil, nil
 }
+
+func (r *mutationResolver) OptimiseDatabase(ctx context.Context) (string, error) {
+	jobID := manager.GetInstance().OptimiseDatabase(ctx)
+	return strconv.Itoa(jobID), nil
+}