Upload 2 files

models/Investment.js

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+const pool = require('../config/db');
+
+const Investment = {
+  create: async (user_id, plan_id, amount) => {
+    await pool.query('INSERT INTO investments (user_id, plan_id, amount) VALUES (?, ?, ?)', [user_id, plan_id, amount]);
+  },
+  findByUser: async (user_id) => {
+    const [rows] = await pool.query('SELECT * FROM investments WHERE user_id = ?', [user_id]);
+    return rows;
+  }
+};
+
+module.exports = Investment;

models/PaymentMethod.js

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+const pool = require('../config/db');
+
+const PaymentMethod = {
+  create: async (crypto_name, wallet_address) => {
+    await pool.query('INSERT INTO payment_methods (crypto_name, wallet_address) VALUES (?, ?)', [crypto_name, wallet_address]);
+  },
+  findAll: async () => {
+    const [rows] = await pool.query('SELECT * FROM payment_methods');
+    return rows;
+  }
+};
+
+module.exports = PaymentMethod;