feat: allow to view tuples outside transactions

Author: emptybutton

src/tgdb/application/relation/view_tuples.py

@@ -22,7 +22,7 @@ class ViewTuples:
 
     async def __call__(
         self,
-        xid: XID,
+        xid: XID | None,
         relation_number: Number,
         attribute_number: Number,
         attribute_scalar: Scalar,
@@ -44,9 +44,10 @@ async def __call__(
             for versioned_tuple in versioned_tuples
         )
 
-        async with self.shared_horizon as horizon:
-            for viewed_tuple_ in viewed_tuples:
-                time = await self.clock
-                horizon.include(time, xid, viewed_tuple_)
+        if xid is not None:
+            async with self.shared_horizon as horizon:
+                for viewed_tuple_ in viewed_tuples:
+                    time = await self.clock
+                    horizon.include(time, xid, viewed_tuple_)
 
         return tuples

src/tgdb/presentation/fastapi/relation/routers.py

@@ -13,8 +13,8 @@
 
 
 relation_routers = (
-    create_relation_router,
     view_all_relations_router,
     view_relation_router,
+    create_relation_router,
     view_tuples_router,
 )

src/tgdb/presentation/fastapi/relation/routes/view_tuples.py

@@ -45,15 +45,15 @@ def of(cls, tuples: Iterable[Tuple]) -> "ViewedTuplesSchema":
     },
     summary="View tuples",
     description="View tuples in an active transaction.",
-    tags=[Tag.relation, Tag.transaction],
+    tags=[Tag.relation],
 )
 @inject
 async def _(
     view_tuples: FromDishka[ViewTuples],
-    xid: XID,
     relation_number: PositiveInt,
     attribute_number: Annotated[PositiveInt, Query(alias="attributeNumber")],
     attribute_scalar: Annotated[Scalar, Query(alias="attributeScalar")],
+    xid: XID | None = None,
 ) -> Response:
     tuples = await view_tuples(
         xid,