app2-api/modules/blog/post-category.model.js

module.exports = function (sequelize, DataTypes) {
  const PostCategory = sequelize.define(
    "PostCategory",
    {
      postId: {
        type: DataTypes.UUID,
        primaryKey: true,
        foreignKey: true,
      },
      categoryId: {
        type: DataTypes.INTEGER,
        primaryKey: true,
        foreignKey: true,
      },
    },
    {
      tableName: "posts_categories",
      freezeTableName: true,
      timestamps: false,
    }
  );

  return PostCategory;
};