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1. AWS Secrets Manager and Dynamo DB - ... AWS Secrets Manager and Dynamo DB - Nest, Typescript

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   import { config, DynamoDB, SecretsManager } from 'aws-sdk';

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   import { Injectable } from '@nestjs/common';

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   import { logger } from './logger';

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   @Injectable()

2. FE CI Workflow S3 Cloudfront FE CI Workflow S3 Cloudfront

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   name: Frontend

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   on:

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     push:

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       branches:

3. SocketIO JS - Supports 10,000+ concu... SocketIO JS - Supports 10,000+ concurrent connections per average Express server instance

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   'use strict';

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   var connection = null;

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   var convId = '';

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   var ioSocket = '';

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   class SocketRoute {

4. Distance calculation - Sequelize mod... Distance calculation - Sequelize model method

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   User.getDistance = async (me) => {

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     try {

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     // Distance algorithm with Earth curvature

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       const users = await User.findAll({

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         where: Sequelize.where(sequelize.literal(`6371 * acos(cos(radians(${me.latitude})) * cos(radians(latitude)) * cos(radians(${me.longitude}) - radians(longitude)) + sin(radians(${me.latitude})) * sin(radians(latitude)))`),