use Postgres built-in uuid 4 function (#1323)

Author: sinisaos

piccolo/columns/defaults/uuid.py

@@ -17,7 +17,7 @@ class UUID4(Default):
 
     @property
     def postgres(self):
-        return "uuid_generate_v4()"
+        return "gen_random_uuid()"
 
     @property
     def cockroach(self):

piccolo/engine/postgres.py

@@ -354,7 +354,7 @@ class PostgresEngine(Engine[PostgresTransaction]):
     def __init__(
         self,
         config: dict[str, Any],
-        extensions: Sequence[str] = ("uuid-ossp",),
+        extensions: Sequence[str] = tuple(),
         log_queries: bool = False,
         log_responses: bool = False,
         extra_nodes: Optional[Mapping[str, PostgresEngine]] = None,

tests/apps/migrations/auto/integration/test_migrations.py

@@ -437,7 +437,7 @@ def test_uuid_column(self):
                 [
                     x.data_type == "uuid",
                     x.is_nullable == "NO",
-                    x.column_default == "uuid_generate_v4()",
+                    x.column_default == "gen_random_uuid()",
                 ]
             ),
         )