feat: add user_stats, audit_logs and verification tokens schema

Made-with: Cursor

src/db/schema/userStats.ts

@@ -0,0 +1,26 @@
+import { pgTable, uuid, integer, timestamp } from 'drizzle-orm/pg-core';
+import { unique } from 'drizzle-orm/pg-core';
+import { stackEnum, levelEnum } from './enums.js';
+import { users } from './users.js';
+
+export const userStats = pgTable(
+  'user_stats',
+  {
+    id: uuid('id').primaryKey().defaultRandom(),
+    userId: uuid('user_id')
+      .notNull()
+      .references(() => users.id, { onDelete: 'cascade' }),
+    stack: stackEnum('stack').notNull(),
+    level: levelEnum('level').notNull(),
+    totalQuestions: integer('total_questions').notNull().default(0),
+    correctAnswers: integer('correct_answers').notNull().default(0),
+    testsTaken: integer('tests_taken').notNull().default(0),
+    lastTestAt: timestamp('last_test_at', { withTimezone: true }),
+  },
+  (t) => ({
+    userStackLevelUnique: unique().on(t.userId, t.stack, t.level),
+  })
+);
+
+export type UserStat = typeof userStats.$inferSelect;
+export type NewUserStat = typeof userStats.$inferInsert;