fix: snapshot deletion, restore grid logic and add diagnostic API

src/features/snapshots/api/get-snapshots.ts

@@ -8,18 +8,21 @@ import { and, desc, eq } from "drizzle-orm";
 export async function getSnapshots(type?: "snapshot" | "export") {
     try {
         const session = await auth();
-        const userId = session?.user ? Number((session.user as any).id) : null;
+        const rawUserId = (session?.user as any)?.id;
+        const userId = rawUserId ? parseInt(String(rawUserId), 10) : null;
 
-        let query = db.select().from(sessionSnapshots);
-        const conditions = [];
-        if (userId) conditions.push(eq(sessionSnapshots.userId, userId));
-        if (type) conditions.push(eq(sessionSnapshots.type, type));
-
-        if (conditions.length > 0) {
-            return query.where(and(...conditions)).orderBy(desc(sessionSnapshots.createdAt));
+        if (!userId || isNaN(userId)) {
+            console.warn("[getSnapshots] Unauthenticated access attempt");
+            return [];
         }
 
-        return query.orderBy(desc(sessionSnapshots.createdAt));
+        const conditions = [eq(sessionSnapshots.userId, userId)];
+        if (type) conditions.push(eq(sessionSnapshots.type, type));
+
+        return await db.select()
+            .from(sessionSnapshots)
+            .where(and(...conditions))
+            .orderBy(desc(sessionSnapshots.createdAt));
     } catch (err: any) {
         const msg = (err?.message || String(err)).split("\n")[0];
         console.error(`[getSnapshots] ERROR (type=${type}):`, msg, err);