web: auto-discover orphaned session files in web-sessions index

apps/web/app/api/web-sessions/route.ts

@@ -1,4 +1,4 @@
-import { readFileSync, writeFileSync, existsSync, mkdirSync } from "node:fs";
+import { readFileSync, writeFileSync, existsSync, mkdirSync, readdirSync, statSync } from "node:fs";
 import { join } from "node:path";
 import { randomUUID } from "node:crypto";
 import { resolveWebChatDir } from "@/lib/workspace";
@@ -23,15 +23,68 @@ function ensureDir() {
   return dir;
 }
 
+/**
+ * Read the session index, auto-discovering any orphaned .jsonl files
+ * that aren't in the index (e.g. from profile switches or missing index).
+ */
 function readIndex(): WebSessionMeta[] {
   const dir = ensureDir();
   const indexFile = join(dir, "index.json");
-  if (!existsSync(indexFile)) {return [];}
-  try {
-    return JSON.parse(readFileSync(indexFile, "utf-8"));
-  } catch {
-    return [];
+  let index: WebSessionMeta[] = [];
+  if (existsSync(indexFile)) {
+    try {
+      index = JSON.parse(readFileSync(indexFile, "utf-8"));
+    } catch {
+      index = [];
+    }
   }
+
+  // Scan for orphaned .jsonl files not in the index
+  try {
+    const indexed = new Set(index.map((s) => s.id));
+    const files = readdirSync(dir).filter((f) => f.endsWith(".jsonl"));
+    let dirty = false;
+    for (const file of files) {
+      const id = file.replace(/\.jsonl$/, "");
+      if (indexed.has(id)) {continue;}
+
+      // Build a minimal index entry from the file
+      const fp = join(dir, file);
+      const stat = statSync(fp);
+      let title = "New Chat";
+      let messageCount = 0;
+      try {
+        const content = readFileSync(fp, "utf-8");
+        const lines = content.split("\n").filter((l) => l.trim());
+        messageCount = lines.length;
+        // Try to extract a title from the first user message
+        for (const line of lines) {
+          const parsed = JSON.parse(line);
+          if (parsed.role === "user" && parsed.content) {
+            const text = String(parsed.content);
+            title = text.length > 60 ? text.slice(0, 60) + "..." : text;
+            break;
+          }
+        }
+      } catch { /* best-effort */ }
+
+      index.push({
+        id,
+        title,
+        createdAt: stat.birthtimeMs || stat.mtimeMs,
+        updatedAt: stat.mtimeMs,
+        messageCount,
+      });
+      dirty = true;
+    }
+
+    if (dirty) {
+      index.sort((a, b) => b.updatedAt - a.updatedAt);
+      writeFileSync(indexFile, JSON.stringify(index, null, 2));
+    }
+  } catch { /* best-effort */ }
+
+  return index;
 }
 
 function writeIndex(sessions: WebSessionMeta[]) {