fix: deduplicate share target triggers across client and server

src/app/api/hooks/note/route.ts

@@ -164,6 +164,34 @@ export async function POST(req: NextRequest) {
       }
     }
 
+    // Deduplication check: if a note with the exact same sourceUrl was created within the last 5 minutes, reuse it!
+    if (url) {
+      const recentDup = await prisma.note.findFirst({
+        where: {
+          userId,
+          sourceUrl: url,
+          createdAt: {
+            gte: new Date(Date.now() - 5 * 60 * 1000), // last 5 minutes
+          },
+        },
+        orderBy: { createdAt: 'desc' },
+      });
+      if (recentDup) {
+        const wantsJson =
+          contentType.includes('application/json') ||
+          Boolean(req.headers.get('accept')?.includes('application/json'));
+
+        if (isShareTarget && !wantsJson) {
+          return NextResponse.redirect(getRedirectUrl(req, recentDup.id), 303);
+        }
+
+        return NextResponse.json(
+          { ok: true, noteId: recentDup.id, title: recentDup.title, mode: 'existing-recent' },
+          { status: 200, headers: corsHeaders }
+        );
+      }
+    }
+
     const notebookId = notebookName.trim()
       ? await getOrCreateNotebookByName(notebookName.trim(), userId)
       : (await ensureDefaultNotebook(userId)).id;

src/app/share/route.ts

@@ -86,6 +86,22 @@ export async function GET(req: NextRequest) {
       }
     }
 
+    if (url) {
+      const recentDup = await prisma.note.findFirst({
+        where: {
+          userId,
+          sourceUrl: url,
+          createdAt: {
+            gte: new Date(Date.now() - 5 * 60 * 1000),
+          },
+        },
+        orderBy: { createdAt: 'desc' },
+      });
+      if (recentDup) {
+        return NextResponse.redirect(getRedirectUrl(req, recentDup.id), 303);
+      }
+    }
+
     let noteId: string;
     if (url && !text) {
       // Direct web clip
@@ -205,6 +221,22 @@ export async function POST(req: NextRequest) {
       }
     }
 
+    if (url) {
+      const recentDup = await prisma.note.findFirst({
+        where: {
+          userId,
+          sourceUrl: url,
+          createdAt: {
+            gte: new Date(Date.now() - 5 * 60 * 1000),
+          },
+        },
+        orderBy: { createdAt: 'desc' },
+      });
+      if (recentDup) {
+        return NextResponse.redirect(getRedirectUrl(req, recentDup.id), 303);
+      }
+    }
+
     const wantsJson =
       contentType.includes('application/json') ||
       Boolean(req.headers.get('accept')?.includes('application/json'));