From a846e7ed7a7a0646fc1fb3f0934d83ea01d297c1 Mon Sep 17 00:00:00 2001
From: zk <zkldi@proton.me>
Date: Wed, 17 Jun 2026 22:18:16 +0100
Subject: [PATCH] fix: i do it to myself (#1682)

---
 .../sessions/SessionRaiseBreakdown.tsx        | 46 +++----------------
 .../tables/game-core-cells/ScoreCoreCells.tsx |  6 ++-
 typescript/common/src/types/documents.ts      |  6 +++
 .../framework/sessions/sessions.ts            |  1 +
 4 files changed, 18 insertions(+), 41 deletions(-)

diff --git a/typescript/client/src/components/sessions/SessionRaiseBreakdown.tsx b/typescript/client/src/components/sessions/SessionRaiseBreakdown.tsx
index be89cd914..11cde6d99 100644
--- a/typescript/client/src/components/sessions/SessionRaiseBreakdown.tsx
+++ b/typescript/client/src/components/sessions/SessionRaiseBreakdown.tsx
@@ -18,9 +18,7 @@ import { APIFetchV1 } from "#util/api";
 import { ChangeOpacity } from "#util/color-opacity";
 import { CreateChartMap, CreateScoreIDMap, CreateSongMap } from "#util/data";
 import { Reverse, UppercaseFirst } from "#util/misc";
-import deepmerge from "deepmerge";
-import { cloneDeep } from "lodash";
-import React, { useContext, useEffect, useMemo, useState } from "react";
+import { useContext, useEffect, useMemo, useState } from "react";
 import { useQuery } from "react-query";
 import {
 	type ChartDocument,
@@ -315,7 +313,6 @@ function ElementStatTable({
 							songMap,
 							fullSize,
 							game,
-							gameConfig,
 							metric: metric,
 							scores,
 							setScores,
@@ -334,7 +331,6 @@ function ElementStatTable({
 								songMap,
 								fullSize,
 								game,
-								gameConfig,
 								metric: metric,
 								scores,
 								setScores,
@@ -366,7 +362,6 @@ function BreakdownChartContents({
 	songMap,
 	chartMap,
 	fullSize,
-	gameConfig,
 	metric,
 	scores,
 	setScores,
@@ -374,7 +369,6 @@ function BreakdownChartContents({
 	chartMap: Map<string, ChartDocument<V3Game>>;
 	fullSize: boolean;
 	game: V3Game;
-	gameConfig: GameConfig;
 	metric: string;
 	score: ScoreDocument;
 	scoreInfo: SessionScoreInfo;
@@ -443,39 +437,11 @@ function BreakdownChartContents({
 		let preScoreCell = <td colSpan={gptImpl.scoreHeaders.length}>No Play</td>;
 
 		if (!scoreInfo.isNewScore) {
-			const newScoreData = cloneDeep(score.scoreData);
-
-			for (const [k, d] of Object.entries(scoreInfo.deltas)) {
-				// @ts-expect-error it'll be an enum
-				if (typeof score.scoreData[k] === "string") {
-					const enumConf = GetScoreMetricConf(
-						gameConfig,
-						k,
-					) as ConfEnumScoreMetric<string>;
-
-					// @ts-expect-error alter the enum
-					const newIndex = score.scoreData.enumIndexes[k] - d;
-
-					// @ts-expect-error alter the enum
-					newScoreData.enumIndexes[k] = newIndex;
-					// @ts-expect-error alter the enum
-					newScoreData[k] = enumConf.values[newIndex] ?? "UNKNOWN ENUM ??";
-				} else {
-					// @ts-expect-error ugh
-					newScoreData[k] = score.scoreData[k] - d;
-				}
-			}
-
-			const mockScore = deepmerge(score, {
-				scoreData: newScoreData,
-			}) as ScoreDocument;
-
-			// We don't actually know what the user's previous score was, we can only walk
-			// back the raise information we have. As such, we don't keep track of
-			// judgements, and must nix them here.
-			mockScore.scoreData.judgements = {};
-
-			preScoreCell = <ScoreCoreCells chart={chart} game={game} score={mockScore} short />;
+			// The server hands us the user's exact PB as of the session start, so
+			// render that directly instead of reconstructing it from deltas.
+			preScoreCell = (
+				<ScoreCoreCells chart={chart} game={game} score={scoreInfo.previousPB} short />
+			);
 		}
 
 		if (score) {
diff --git a/typescript/client/src/components/tables/game-core-cells/ScoreCoreCells.tsx b/typescript/client/src/components/tables/game-core-cells/ScoreCoreCells.tsx
index c72d566b4..cb7b3bddc 100644
--- a/typescript/client/src/components/tables/game-core-cells/ScoreCoreCells.tsx
+++ b/typescript/client/src/components/tables/game-core-cells/ScoreCoreCells.tsx
@@ -20,7 +20,11 @@ export default function ScoreCoreCells({
 	chart: ChartDocument;
 	game: V3Game;
 	rating?: AnyScoreRatingAlg;
-	score: PBScoreDocument | ScoreDocument;
+
+	// `Omit<PBScoreDocument, "rankingData">` covers historical/"as of" PBs (e.g.
+	// a session's previous PB), which carry no ranking data. Neither the score
+	// cells nor the rating cell read `rankingData`, so this is safe.
+	score: Omit<PBScoreDocument, "rankingData"> | ScoreDocument;
 	short?: boolean;
 }): JSX.Element {
 	const [defaultRating] = useScoreRatingAlg(game);
diff --git a/typescript/common/src/types/documents.ts b/typescript/common/src/types/documents.ts
index 872966346..f54967f01 100644
--- a/typescript/common/src/types/documents.ts
+++ b/typescript/common/src/types/documents.ts
@@ -129,6 +129,12 @@ interface SessionScorePBInfo {
 
 	// metric -> difference between previous PB.
 	deltas: Record<string, number>;
+
+	// The user's PB on this chart as of the session's start, i.e. exactly what
+	// this score raised from. Lets consumers render the true previous values
+	// (optional metrics, judgements, merges) instead of reconstructing them from
+	// deltas. Has no `rankingData`, as that isn't meaningful for a historical PB.
+	previousPB: Omit<PBScoreDocument, "rankingData">;
 }
 
 interface SessionScoreNewInfo {
diff --git a/typescript/server/src/lib/score-import/framework/sessions/sessions.ts b/typescript/server/src/lib/score-import/framework/sessions/sessions.ts
index 0bacd3d22..f193e5b70 100644
--- a/typescript/server/src/lib/score-import/framework/sessions/sessions.ts
+++ b/typescript/server/src/lib/score-import/framework/sessions/sessions.ts
@@ -77,6 +77,7 @@ function ScoreToSessionScoreInfo(
 		scoreID: score.scoreID,
 		isNewScore: false,
 		deltas,
+		previousPB,
 	};
 }