feat: add enrichWithNames to admin learning API

All list endpoints now return userName, kbName, materialName
resolved from User, KnowledgeBase, KnowledgeSource tables.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/modules/learning-session/admin-learning.service.ts

@@ -9,6 +9,39 @@ export class AdminLearningService {
     private readonly snapshotBuilder: SnapshotBuilderService,
   ) {}
 
+  // ══ Name resolution ══
+
+  private async enrichWithNames<T extends Record<string, any>>(items: T[]): Promise<(T & { userName?: string; kbName?: string; materialName?: string })[]> {
+    if (items.length === 0) return items;
+
+    const userIds = [...new Set(items.map(i => i.userId).filter(Boolean))];
+    const kbIds = [...new Set(items.map(i => i.knowledgeBaseId).filter(Boolean))];
+    const materialIds = [...new Set(items.map(i => i.materialId).filter(Boolean))];
+
+    const [users, kbs, materials] = await Promise.all([
+      userIds.length > 0
+        ? this.prisma.user.findMany({ where: { id: { in: userIds } }, select: { id: true, nickname: true } })
+        : [],
+      kbIds.length > 0
+        ? this.prisma.knowledgeBase.findMany({ where: { id: { in: kbIds } }, select: { id: true, title: true } })
+        : [],
+      materialIds.length > 0
+        ? this.prisma.knowledgeSource.findMany({ where: { id: { in: materialIds } }, select: { id: true, originalFilename: true, title: true } })
+        : [],
+    ]);
+
+    const userMap = new Map<string, string>(users.map(u => [u.id, u.nickname || u.id] as [string, string]));
+    const kbMap = new Map<string, string>(kbs.map(k => [k.id, k.title] as [string, string]));
+    const matMap = new Map<string, string>(materials.map(m => [m.id, m.originalFilename || m.title || m.id] as [string, string]));
+
+    return items.map(item => ({
+      ...item,
+      userName: userMap.get(item.userId),
+      kbName: kbMap.get(item.knowledgeBaseId),
+      materialName: matMap.get(item.materialId),
+    }));
+  }
+
   // ══ Knowledge Bases (for filter dropdown) ══
 
   async getKnowledgeBases() {
@@ -112,7 +145,7 @@ export class AdminLearningService {
       this.prisma.readingEvent.findMany({ where, orderBy, skip: (page - 1) * limit, take: limit }),
       this.prisma.readingEvent.count({ where }),
     ]);
-    return { items, total, page, limit };
+    const enriched = await this.enrichWithNames(items); return { items: enriched, total, page, limit };
   }
 
   async getReadingEvent(id: string) {
@@ -138,7 +171,7 @@ export class AdminLearningService {
       this.prisma.learningSession.findMany({ where, orderBy: { startedAt: 'desc' }, skip: (page - 1) * limit, take: limit }),
       this.prisma.learningSession.count({ where }),
     ]);
-    return { items, total, page, limit };
+    const enriched = await this.enrichWithNames(items); return { items: enriched, total, page, limit };
   }
 
   async getSession(id: string) {
@@ -161,7 +194,7 @@ export class AdminLearningService {
       this.prisma.materialReadingProgress.findMany({ where, orderBy: { lastReadAt: 'desc' }, skip: (page - 1) * limit, take: limit }),
       this.prisma.materialReadingProgress.count({ where }),
     ]);
-    return { items, total, page, limit };
+    const enriched = await this.enrichWithNames(items); return { items: enriched, total, page, limit };
   }
 
   async getProgressDetail(id: string) {
@@ -184,7 +217,7 @@ export class AdminLearningService {
       this.prisma.dailyLearningActivity.findMany({ where, orderBy: { activityDate: 'desc' }, skip: (page - 1) * limit, take: limit }),
       this.prisma.dailyLearningActivity.count({ where }),
     ]);
-    return { items, total, page, limit };
+    const enriched = await this.enrichWithNames(items); return { items: enriched, total, page, limit };
   }
 
   // ══ Records ══
@@ -202,7 +235,7 @@ export class AdminLearningService {
       this.prisma.learningRecord.findMany({ where, orderBy: { occurredAt: 'desc' }, skip: (page - 1) * limit, take: limit }),
       this.prisma.learningRecord.count({ where }),
     ]);
-    return { items, total, page, limit };
+    const enriched = await this.enrichWithNames(items); return { items: enriched, total, page, limit };
   }
 
   async getRecord(id: string) {
@@ -225,7 +258,7 @@ export class AdminLearningService {
       }),
       this.prisma.aiAnalysisResult.count({ where }),
     ]);
-    return { items, total, page, limit };
+    const enriched = await this.enrichWithNames(items); return { items: enriched, total, page, limit };
   }
 
   // ══ AI Usage ══
@@ -243,7 +276,7 @@ export class AdminLearningService {
       }),
       this.prisma.aiUsageLog.count({ where }),
     ]);
-    return { items, total, page, limit };
+    const enriched = await this.enrichWithNames(items); return { items: enriched, total, page, limit };
   }
 
   // ══ Timeline ══
@@ -310,7 +343,7 @@ export class AdminLearningService {
       this.prisma.temporaryReadingMaterial.findMany({ orderBy: { createdAt: 'desc' }, skip: (page - 1) * limit, take: limit }),
       this.prisma.temporaryReadingMaterial.count(),
     ]);
-    return { items, total, page, limit };
+    const enriched = await this.enrichWithNames(items); return { items: enriched, total, page, limit };
   }
 
   // ══ Operations ══