fix: resolve TypeScript build errors from leftJoin nullable types

Non-null assert photo/achievement ids that are structurally non-null
due to FK constraints but nullable in Drizzle's leftJoin return type.
Add missing description field to enrichVideo model select and map.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/backend/src/graphql/resolvers/gamification.ts

@@ -102,7 +102,14 @@ builder.queryField("userGamification", (t) =>
       return {
         stats: stats[0] ? { ...stats[0], rank } : null,
         achievements: userAchievements.map((a) => ({
-          ...a,
+          id: a.id!,
+          code: a.code!,
+          name: a.name!,
+          description: a.description!,
+          icon: a.icon!,
+          category: a.category!,
+          required_count: a.required_count!,
+          progress: a.progress!,
           date_unlocked: a.date_unlocked!,
         })),
         recent_points: recentPoints,

packages/backend/src/graphql/resolvers/models.ts

@@ -15,8 +15,8 @@ async function enrichModel(db: DB, user: typeof users.$inferSelect) {
 
   const seen = new Set<string>();
   const photos = photoRows
-    .filter((p) => p.id && !seen.has(p.id) && seen.add(p.id))
-    .map((p) => ({ id: p.id, filename: p.filename }));
+    .filter((p) => p.id !== null && !seen.has(p.id!) && seen.add(p.id!))
+    .map((p) => ({ id: p.id!, filename: p.filename! }));
 
   return { ...user, photos };
 }

packages/backend/src/graphql/resolvers/users.ts

@@ -195,8 +195,8 @@ builder.queryField("adminGetUser", (t) =>
         .orderBy(user_photos.sort);
       const seen = new Set<string>();
       const photos = photoRows
-        .filter((p) => p.id && !seen.has(p.id) && seen.add(p.id))
-        .map((p) => ({ id: p.id, filename: p.filename }));
+        .filter((p) => p.id !== null && !seen.has(p.id!) && seen.add(p.id!))
+        .map((p) => ({ id: p.id!, filename: p.filename! }));
       return { ...user[0], photos };
     },
   }),

packages/backend/src/graphql/resolvers/videos.ts

@@ -41,6 +41,7 @@ async function enrichVideo(db: DB, video: typeof videos.$inferSelect) {
       artist_name: users.artist_name,
       slug: users.slug,
       avatar: users.avatar,
+      description: users.description,
     })
     .from(video_models)
     .leftJoin(users, eq(video_models.user_id, users.id))
@@ -63,9 +64,19 @@ async function enrichVideo(db: DB, video: typeof videos.$inferSelect) {
     .from(video_plays)
     .where(eq(video_plays.video_id, video.id));
 
+  const models = modelRows
+    .filter((m) => m.id !== null)
+    .map((m) => ({
+      id: m.id!,
+      artist_name: m.artist_name,
+      slug: m.slug,
+      avatar: m.avatar,
+      description: m.description,
+    }));
+
   return {
     ...video,
-    models: modelRows,
+    models,
     movie_file: movieFile,
     likes_count: likesCount[0]?.count || 0,
     plays_count: playsCount[0]?.count || 0,