feat: #be add timestamps everywhere in db

backend/migrations/20220404144303_timestamps.ts

+import { Knex } from "knex";
+
+export async function up(knex: Knex): Promise<void> {
+  knex.schema
+    .alterTable("words", (table) => table.timestamps())
+    .alterTable("games", (table) => table.timestamps())
+    .alterTable("clues", (table) => table.timestamps())
+    .alterTable("shots", (table) => table.timestamps());
+}
+
+export async function down(knex: Knex): Promise<void> {
+  knex.schema
+    .alterTable("words", (table) => table.dropTimestamps())
+    .alterTable("games", (table) => table.dropTimestamps())
+    .alterTable("clues", (table) => table.dropTimestamps())
+    .alterTable("shots", (table) => table.dropTimestamps());
+}