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

SpiceDB

This is the `EXPLAIN ANALYZE` for it:
```
Result  (cost=1.07..1.08 rows=1 width=16) (actual time=28103.240..28103.242 rows=1 loops=1)
  InitPlan 1 (returns $0)
    ->  Limit  (cost=0.43..0.54 rows=1 width=8) (actual time=28103.219..28103.220 rows=1 loops=1)
          ->  Index Scan using pk_rttx on relation_tuple_transaction  (cost=0.43..193195.54 rows=1823603 width=8) (actual time=28103.218..28103.218 rows=1 loops=1)
                Index Cond: (id IS NOT NULL)
                Filter: ("timestamp" >= '2022-03-15 00:00:00'::timestamp without time zone)
                Rows Removed by Filter: 548517
  InitPlan 2 (returns $1)
    ->  Limit  (cost=0.43..0.54 rows=1 width=8) (actual time=0.016..0.016 rows=1 loops=1)
          ->  Index Scan Backward using pk_rttx on relation_tuple_transaction relation_tuple_transaction_1  (cost=0.43..193195.54 rows=1823603 width=8) (actual time=0.015..0.015 rows=1 loops=1)
                Index Cond: (id IS NOT NULL)
                Filter: ("timestamp" >= '2022-03-15 00:00:00'::timestamp without time zone)
Planning time: 0.375 ms
Execution time: 28103.275 ms
```