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Re:Ask HN: Idea Sunday by mjadobson on Sunday April 13, 2014 @03:16PM (#7582534)
Hosted PostgreSQL service with exposed HTTP API and ACL/validation hooks. Also syncing hooks to plug into SQLite/iDB/etc for offline apps.

Sort of like Cloudant/Firebase but using relational db.

Re:Ask HN: Idea Sunday by andrewstuart on Sunday April 13, 2014 @10:08PM (#7584149)
Not quite what you are suggesting but....

http://aws.amazon.com/rds/postgresql/