SpiceDB is an open source, Google Zanzibar-inspired, database system for creating and managing security-critical application permissions.

SpiceDB

```
spicedb=# select * from relation_tuple;
 namespace | object_id | relation | userset_namespace | userset_object_id | userset_relation | created_xid |     deleted_xid     
-----------+-----------+----------+-------------------+-------------------+------------------+-------------+---------------------
 resource  | alerts    | reader   | role              | readonly          | member           |         787 | 9223372036854775807
(1 row)

spicedb=# select * from relation_tuple_transaction;
         timestamp          | xid | snapshot 
----------------------------+-----+----------
 1970-01-01 00:00:00        |   1 | 1:1:
 2022-10-14 00:26:23.658744 | 785 | 785:785:
 2022-10-14 00:27:37.423208 | 787 | 787:787:
```