ctx, tx, err := ds.storage.Begin(ctx)
if err != nil {
    return "", err
}

policyNameToPolicyMap := make(map[string]*storage.Policy, len(allPolicies))
for _, policy := range allPolicies {
    policyNameToPolicyMap[policy.GetName()] = policy
}

if findPolicyWithSameName(policyNameToPolicyMap, policy.GetName()) != nil {
    return "", fmt.Errorf("Could not add policy due to name validation, policy with name %s already exists", policy.GetName())
}
policyutils.FillSortHelperFields(policy)
// Any policy added after startup must be marked custom policy.
markPoliciesAsCustom(policy)

// Stash away the category names, since they need to be erased on storage. But the policy insert must happen first,
// to get an ID, to satisfy foreign key constraints when policy category edges are added.
policyCategories := policy.GetCategories()