refactor: unify data preparations and research input snapshots

backend/app/research/routes.py

@@ -28,12 +28,6 @@ from .workspace_contracts import (
 router = APIRouter(prefix="/api/v1/research", tags=["research"], dependencies=[Depends(require_auth)])
 
 
-@router.get("/inputs")
-async def inputs(request: Request, limit: int = Query(100, ge=1, le=100)):
-    async with request.app.state.sessions() as db:
-        return await Experiments(db).available_inputs(limit)
-
-
 @router.get("/assets")
 async def assets(
     request: Request,
@@ -96,10 +90,10 @@ async def import_commit(body: ImportCommit, request: Request):
 
 @router.post("/generate", status_code=201)
 async def generate(body: Generation, request: Request):
-    async with request.app.state.sessions() as db:
+    async with request.app.state.sessions.begin() as db:
         context = await Experiments(db).generation_context(body)
     result, evidence = await request_model(request.app.state.ai, context, OUTPUTS[body.method])
-    if body.method == "feature" and set(result.input_ids) != set(body.input_ids):
+    if body.method == "feature" and (result.preparation_refs or set(result.input_ids) != set(body.input_ids)):
         raise HTTPException(422, "模型不能改变已固定的输入范围")
     async with request.app.state.sessions.begin() as db:
         asset = await Assets(db).save(