siimee/backend/db/migrations/20210527174440_create_groupings_table.js

exports.up = function(knex) {
    return knex.schema
        .createTable('memberships', function(table) {
            table.increments('membership_id').primary()
            table.integer('user_id').notNullable() // From
            table.integer('grouping_id').notNullable() // To
            table.string('membership_type', 128).notNullable() // Don't over normalize
            table.boolean('can_edit').notNullable()
        })
}

exports.down = function(knex) {
    return knex.schema
        .dropTable('memberships')
}