feat: Added migration for creating a challenge table

Author: roerohan

src/migrations/20200916234356_create_challenges.ts

@@ -0,0 +1,21 @@
+import * as Knex from 'knex';
+
+export async function up(knex: Knex): Promise<void> {
+    return knex.schema.createTable('challenges', (table) => {
+        table.uuid('id').unique().primary().notNullable();
+        table.string('name').unique().notNullable();
+        table.string('description').notNullable();
+        table.string('category').notNullable();
+        table.specificType('tags', 'TEXT[]');
+        table.boolean('visible').defaultTo(false).notNullable();
+        table.string('type').notNullable();
+        table.float('points');
+        table.float('initial_points');
+        table.float('minimum_points');
+        table.float('decay');
+    });
+}
+
+export async function down(knex: Knex): Promise<void> {
+    return knex.schema.dropTable('challenges');
+}