Fix SQL connection error

[shivamshekhar]

Server shut down abruptly due to following sql connection error.

9 Apr 14:52:43 - Database is successfully connected
9 Apr 14:52:43 - Chat app listening at 3000
events.js:291
      throw er; // Unhandled 'error' event
      ^

Error: Connection lost: The server closed the connection.
    at Protocol.end (/home/ubuntu/server/chat-app-backend/node_modules/mysql/lib/protocol/Protocol.js:112:13)
    at Socket.<anonymous> (/home/ubuntu/server/chat-app-backend/node_modules/mysql/lib/Connection.js:94:28)
    at Socket.<anonymous> (/home/ubuntu/server/chat-app-backend/node_modules/mysql/lib/Connection.js:526:10)
    at Socket.emit (events.js:326:22)
    at endReadableNT (_stream_readable.js:1241:12)
    at processTicksAndRejections (internal/process/task_queues.js:84:21)
Emitted 'error' event on Connection instance at:
    at Connection._handleProtocolError (/home/ubuntu/server/chat-app-backend/node_modules/mysql/lib/Connection.js:423:8)
    at Protocol.emit (events.js:314:20)
    at Protocol._delegateError (/home/ubuntu/server/chat-app-backend/node_modules/mysql/lib/protocol/Protocol.js:398:10)
    at Protocol.end (/home/ubuntu/server/chat-app-backend/node_modules/mysql/lib/protocol/Protocol.js:116:8)
    at Socket.<anonymous> (/home/ubuntu/server/chat-app-backend/node_modules/mysql/lib/Connection.js:94:28)
    [... lines matching original stack trace ...]
    at processTicksAndRejections (internal/process/task_queues.js:84:21) {
  fatal: true,
  code: 'PROTOCOL_CONNECTION_LOST'
}

Potential Fix : https://stackoverflow.com/questions/20210522/nodejs-mysql-error-connection-lost-the-server-closed-the-connection