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Endatabas
Simon Willison's Weblog simonwillison.net
Endatabas is "an open source immutable database" - also described as "SQL document database with full history".
It uses a variant of SQL which allows you to insert data into tables that don't exist yet (they'll be created automatically) then run standard select queries, joins etc. It maintains a full history of every record and supports the recent SQL standard "FOR SYSTEM_TIME AS OF" clause for retrieving historical records as they existed at a specified time (it defaults to …
data database databases document document database etc every history joins lisp open source queries sql standard tables