Footnote to QLDB: AWS has deprecated QLDB[1]. They actually recommend using Postgres with pgAudit and a bunch of complexity around it[2]. I'm not sure how I feel about such a misunderstanding of one's own offerings of this level.
[1] https://docs.aws.amazon.com/qldb/latest/developerguide/what-...
[2] https://aws.amazon.com/blogs/database/replace-amazon-qldb-wi...