feat: implement mysql connection pool with deadlock retry and add reverse geocoding worker service

config/dbMysqlConn.js

@@ -43,4 +43,33 @@ pool.getConnection((err, conn) => {
 //   console.log('Connection %d released', connection.threadId);
 // });
 
+// --- The Deadlock Optimizer ---
+// This function wraps your queries and retries them if a deadlock occurs
+const queryWithRetry = async (sql, params, retries = 3) => {
+	for (let attempt = 1; attempt <= retries; attempt++) {
+		try {
+			return await pool.execute(sql, params);
+		} catch (err) {
+			const isDeadlock = err.code === 'ER_LOCK_DEADLOCK' || err.errno === 1213;
+
+			if (isDeadlock && attempt < retries) {
+				console.warn(`Deadlock detected. Retry attempt ${attempt}...`);
+				// Wait slightly longer each time (Exponential Backoff)
+				await new Promise(res => setTimeout(res, attempt * 100));
+				continue;
+			}
+			throw err; // If not a deadlock or out of retries, throw
+		}
+	}
+};
+
+module.exports = {
+	pool,
+	query: queryWithRetry
+};
+
+
 module.exports = pool;
+
+
+