Knowing when an index was created will help developers determine whether they should drop the index if there has been no reads on that index. If the index was created 'far' in the past with no reads, it's a definite signal to drop. If it was recently created, the developer may want to hold off until they run their workload to see if the index will be used. This would complement crdb_internal.index_usage_statistics.

Epic: CRDB-9075