I'm having some issues with a standalone instance of SpiceDB... I installed it via

brew install authzed/tap/spicedb

, and then I ran the migrations using the following command

spicedb migrate head --datastore-engine postgres --datastore-conn-uri "postgres://spicedb:spicedb@localhost:5432/spicedb?sslmode=disable"

, and then I started it using

spicedb serve --grpc-preshared-key a4a01703-dc9c-4dc9-826c-83b3b8b4ce28 --datastore-engine postgres --datastore-conn-uri "postgres://spicedb:spicedb@localhost:5432/spicedb?sslmode=disable"