Fix Neon URL cleanup and add health error details

Use URL API instead of regex for reliable channel_binding removal.
Add error message to health endpoint for debugging.

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

Author: IMMINJU

src/app/api/health/route.ts

@@ -6,7 +6,10 @@ export async function GET() {
   try {
     await db.execute(sql`SELECT 1`)
     return NextResponse.json({ status: 'ok' })
-  } catch {
-    return NextResponse.json({ status: 'error' }, { status: 503 })
+  } catch (error) {
+    return NextResponse.json(
+      { status: 'error', message: error instanceof Error ? error.message : 'Unknown error' },
+      { status: 503 }
+    )
   }
 }

src/db/index.ts

@@ -13,7 +13,9 @@ function getDb() {
   }
 
   // Strip channel_binding param (unsupported by postgres.js, added by Neon)
-  const cleanedUrl = connectionString.replace(/[?&]channel_binding=[^&]*/g, '')
+  const url = new URL(connectionString)
+  url.searchParams.delete('channel_binding')
+  const cleanedUrl = url.toString()
 
   const isProduction = process.env.NODE_ENV === 'production'