add models

backend/src/config/db.js

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+const { Sequelize } = require('sequelize');
+const dotenv = require('dotenv');
+
+dotenv.config();
+
+const sequelize = new Sequelize(
+  process.env.DB_NAME,
+  process.env.DB_USER,
+  process.env.DB_PASSWORD,
+  {
+    host: process.env.DB_HOST,
+    port: process.env.DB_PORT,
+    dialect: 'postgres',
+    logging: false,
+    pool: {
+      max: 5,
+      min: 0,
+      acquire: 30000,
+      idle: 10000
+    }
+  }
+);
+
+const testConnection = async () => {
+  try {
+    await sequelize.authenticate();
+    console.log('Database connection established successfully.');
+  } catch (error) {
+    console.error('Unable to connect to the database:', error);
+    process.exit(1);
+  }
+};
+
+module.exports = { sequelize, testConnection };

backend/src/models/Collection.js

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+const { DataTypes } = require('sequelize');
+const { sequelize } = require('../config/db');
+
+const Collection = sequelize.define('Collection', {
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true
+  },
+  purchaseDate: {
+    type: DataTypes.DATE
+  },
+  purchasePrice: {
+    type: DataTypes.FLOAT
+  },
+  notes: {
+    type: DataTypes.TEXT
+  },
+  bottleStatus: {
+    type: DataTypes.ENUM('sealed', 'opened', 'empty'),
+    defaultValue: 'sealed'
+  }
+});

backend/src/models/Rating.js

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+const { DataTypes } = require('sequelize');
+const { sequelize } = require('../config/db');
+
+const Rating = sequelize.define('Rating', {
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true
+  },
+  score: {
+    type: DataTypes.INTEGER,
+    allowNull: false,
+    validate: {
+      min: 0,
+      max: 100
+    }
+  },
+  notes: {
+    type: DataTypes.TEXT
+  },
+  nose: {
+    type: DataTypes.INTEGER,
+    validate: {
+      min: 0,
+      max: 10
+    }
+  },
+  taste: {
+    type: DataTypes.INTEGER,
+    validate: {
+      min: 0,
+      max: 10
+    }
+  },
+  finish: {
+    type: DataTypes.INTEGER,
+    validate: {
+      min: 0,
+      max: 10
+    }
+  }
+});

backend/src/models/User.js

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+const { DataTypes } = require('sequelize');
+const { sequelize } = require('../config/db');
+const bcrypt = require('bcrypt');
+
+const User = sequelize.define('User', {
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true
+  },
+  username: {
+    type: DataTypes.STRING,
+    allowNull: false,
+    unique: true
+  },
+  email: {
+    type: DataTypes.STRING,
+    allowNull: false,
+    unique: true,
+    validate: {
+      isEmail: true
+    }
+  },
+  password: {
+    type: DataTypes.STRING,
+    allowNull: false
+  }
+}, {
+  hooks: {
+    beforeCreate: async (user) => {
+      const salt = await bcrypt.genSalt(10);
+      user.password = await bcrypt.hash(user.password, salt);
+    }
+  }
+});
+
+User.prototype.validatePassword = async function(password) {
+  return await bcrypt.compare(password, this.password);
+};

backend/src/models/Whisky.js

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+const { DataTypes } = require('sequelize');
+const { sequelize } = require('../config/db');
+
+const Whiskey = sequelize.define('Whiskey', {
+  id: {
+    type: DataTypes.INTEGER,
+    primaryKey: true,
+    autoIncrement: true
+  },
+  name: {
+    type: DataTypes.STRING,
+    allowNull: false
+  },
+  distillery: {
+    type: DataTypes.STRING,
+    allowNull: false
+  },
+  type: {
+    type: DataTypes.STRING,
+    allowNull: false
+  },
+  country: {
+    type: DataTypes.STRING,
+    allowNull: false
+  },
+  region: {
+    type: DataTypes.STRING
+  },
+  age: {
+    type: DataTypes.INTEGER
+  },
+  abv: {
+    type: DataTypes.FLOAT
+  },
+  price: {
+    type: DataTypes.FLOAT
+  },
+  description: {
+    type: DataTypes.TEXT
+  },
+  imageUrl: {
+    type: DataTypes.STRING
+  }
+});