feat: Add Prompt to setPromptVersionTag mutation

app/schema.graphql

@@ -1533,6 +1533,7 @@ type PromptVersionTag implements Node {
 
 type PromptVersionTagMutationPayload {
   promptVersionTag: PromptVersionTag
+  prompt: Prompt!
   query: Query!
 }
 

src/phoenix/server/api/mutations/prompt_version_tag_mutations.py

@@ -1,7 +1,7 @@
 from typing import Optional
 
 import strawberry
-from sqlalchemy import delete, select
+from sqlalchemy import select
 from sqlalchemy.exc import IntegrityError as PostgreSQLIntegrityError
 from sqlean.dbapi2 import IntegrityError as SQLiteIntegrityError  # type: ignore[import-untyped]
 from strawberry.relay import GlobalID
@@ -12,6 +12,7 @@
 from phoenix.server.api.exceptions import BadRequest, Conflict, NotFound
 from phoenix.server.api.queries import Query
 from phoenix.server.api.types.node import from_global_id_with_expected_type
+from phoenix.server.api.types.Prompt import Prompt, to_gql_prompt_from_orm
 from phoenix.server.api.types.PromptVersion import PromptVersion
 from phoenix.server.api.types.PromptVersionTag import PromptVersionTag, to_gql_prompt_version_tag
 
@@ -31,6 +32,7 @@ class SetPromptVersionTagInput:
 @strawberry.type
 class PromptVersionTagMutationPayload:
     prompt_version_tag: Optional[PromptVersionTag]
+    prompt: Prompt
     query: Query
 
 
@@ -44,15 +46,33 @@ async def delete_prompt_version_tag(
             prompt_version_tag_id = from_global_id_with_expected_type(
                 input.prompt_version_tag_id, PromptVersionTag.__name__
             )
-            stmt = delete(models.PromptVersionTag).where(
-                models.PromptVersionTag.id == prompt_version_tag_id
+            stmt = (
+                select(models.PromptVersionTag, models.Prompt)
+                .join(
+                    models.PromptVersion,
+                    models.PromptVersion.id == models.PromptVersionTag.prompt_version_id,
+                )
+                .join(models.Prompt, models.Prompt.id == models.PromptVersion.prompt_id)
+                .where(models.PromptVersionTag.id == prompt_version_tag_id)
             )
             result = await session.execute(stmt)
-            if result.rowcount == 0:
+            if results := result.one_or_none():
+                prompt_version_tag, prompt = results
+
+            if not prompt_version_tag:
                 raise NotFound(f"PromptVersionTag with ID {input.prompt_version_tag_id} not found")
 
+            if not prompt:
+                raise BadRequest(
+                    f"PromptVersionTag with ID {input.prompt_version_tag_id} "
+                    "does not belong to a prompt"
+                )
+
+            await session.delete(prompt_version_tag)
             await session.commit()
-            return PromptVersionTagMutationPayload(prompt_version_tag=None, query=Query())
+            return PromptVersionTagMutationPayload(
+                prompt_version_tag=None, query=Query(), prompt=to_gql_prompt_from_orm(prompt)
+            )
 
     @strawberry.mutation
     async def set_prompt_version_tag(
@@ -66,9 +86,14 @@ async def set_prompt_version_tag(
                 select(models.PromptVersion).where(models.PromptVersion.id == prompt_version_id)
             )
             if not prompt_version:
-                raise BadRequest("PromptVersion with ID {input.prompt_version_id} not found.")
+                raise BadRequest(f"PromptVersion with ID {input.prompt_version_id} not found.")
 
             prompt_id = prompt_version.prompt_id
+            prompt = await session.scalar(
+                select(models.Prompt).where(models.Prompt.id == prompt_id)
+            )
+            if not prompt:
+                raise BadRequest("All prompt version tags must belong to a prompt")
 
             existing_tag = await session.scalar(
                 select(models.PromptVersionTag).where(
@@ -101,4 +126,6 @@ async def set_prompt_version_tag(
                 raise Conflict("Failed to update PromptVersionTag.")
 
             version_tag = to_gql_prompt_version_tag(updated_tag)
-            return PromptVersionTagMutationPayload(prompt_version_tag=version_tag, query=Query())
+            return PromptVersionTagMutationPayload(
+                prompt_version_tag=version_tag, prompt=to_gql_prompt_from_orm(prompt), query=Query()
+            )