diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..bf63ddc
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,13 @@
+PORT=3000
+
+DB_STRYKER_HOST=127.0.0.1
+DB_STRYKER_PORT=5432
+DB_STRYKER_DATABASE=
+DB_STRYKER_USER=
+DB_STRYKER_PASSWORD=
+
+DB_BECKMAN_HOST=127.0.0.1
+DB_BECKMAN_PORT=5432
+DB_BECKMAN_DATABASE=
+DB_BECKMAN_USER=
+DB_BECKMAN_PASSWORD=
\ No newline at end of file
diff --git a/server.js b/server.js
index 7ea1cfb..8e9f382 100644
--- a/server.js
+++ b/server.js
@@ -11,7 +11,7 @@ const PORT = process.env.PORT || 3000;
 
 // Middleware
 app.use(cors());
-app.use(express.json());
+app.use(express.json({ limit: '10mb' }));
 
 // PostgreSQL connection pool
 function handleHeaders(headers) {
@@ -155,10 +155,11 @@ app.post('/api/postgres/transaction', async (req, res) => {
     }
 
     let pool;
-    const client = await pool.connect();
-
+    let client;
     try {
-        pool = handleHeaders(req.headers);
+        pool   = handleHeaders(req.headers);
+        client = await pool.connect();
+
         await client.query('BEGIN');
 
         const results = [];
@@ -177,16 +178,15 @@ app.post('/api/postgres/transaction', async (req, res) => {
             results: results
         });
     } catch (error) {
-        await client.query('ROLLBACK');
+        if (client) await client.query('ROLLBACK');
         console.error('TRANSACTION Error:', error);
-
         res.status(400).json({
             success: false,
             error: error.message
         });
     } finally {
-        client.release();
-        if (pool) await pool.end();
+        if (client) client.release();
+        if (pool)   await pool.end();
     }
 });