Refactor: Fully migrated to direct PostgreSQL, implemented Public API v1, fixed Vercel deployment conflicts, and updated documentation

app/api/merchants/[id]/route.ts

@@ -1,5 +1,5 @@
 import { NextRequest, NextResponse } from 'next/server';
-import { supabaseAdmin } from '@/lib/supabase-admin';
+import { db } from '@/lib/db';
 
 export async function GET(
     req: NextRequest,
@@ -7,14 +7,11 @@ export async function GET(
 ) {
     try {
         const { id } = await context.params;
-        const { data, error } = await supabaseAdmin
-            .from('merchants')
-            .select('*')
-            .eq('id', id)
-            .single();
+        const result = await db.query('SELECT * FROM merchants WHERE id = $1 LIMIT 1', [id]);
+        const data = result.rows[0];
 
-        if (error) {
-            return NextResponse.json({ error: error.message }, { status: 404 });
+        if (!data) {
+            return NextResponse.json({ error: 'Merchant not found' }, { status: 404 });
         }
 
         return NextResponse.json(data);
@@ -41,20 +38,14 @@ export async function PATCH(
             );
         }
 
-        const { data, error } = await supabaseAdmin
-            .from('merchants')
-            .update({
-                name,
-                webhook_url,
-                payment_provider,
-                provider_config
-            })
-            .eq('id', id)
-            .select()
-            .single();
+        const result = await db.query(
+            'UPDATE merchants SET name = $1, webhook_url = $2, payment_provider = $3, provider_config = $4 WHERE id = $5 RETURNING *',
+            [name, webhook_url, payment_provider, provider_config, id]
+        );
+        const data = result.rows[0];
 
-        if (error) {
-            return NextResponse.json({ error: error.message }, { status: 500 });
+        if (!data) {
+            return NextResponse.json({ error: 'Update failed or merchant not found' }, { status: 500 });
         }
 
         return NextResponse.json(data);
@@ -72,14 +63,7 @@ export async function DELETE(
 ) {
     try {
         const { id } = await context.params;
-        const { error } = await supabaseAdmin
-            .from('merchants')
-            .delete()
-            .eq('id', id);
-
-        if (error) {
-            return NextResponse.json({ error: error.message }, { status: 500 });
-        }
+        await db.query('DELETE FROM merchants WHERE id = $1', [id]);
 
         return NextResponse.json({ success: true });
     } catch (err: any) {