feat: add tests and test_questions schema

Made-with: Cursor

src/db/schema/tests.ts

@@ -0,0 +1,22 @@
+import { pgTable, uuid, integer, timestamp } from 'drizzle-orm/pg-core';
+import { stackEnum, levelEnum, testModeEnum, testStatusEnum } from './enums.js';
+import { users } from './users.js';
+
+export const tests = pgTable('tests', {
+  id: uuid('id').primaryKey().defaultRandom(),
+  userId: uuid('user_id')
+    .notNull()
+    .references(() => users.id, { onDelete: 'cascade' }),
+  stack: stackEnum('stack').notNull(),
+  level: levelEnum('level').notNull(),
+  questionCount: integer('question_count').notNull(),
+  mode: testModeEnum('mode').notNull().default('fixed'),
+  status: testStatusEnum('status').notNull().default('in_progress'),
+  score: integer('score'),
+  startedAt: timestamp('started_at', { withTimezone: true }).notNull().defaultNow(),
+  finishedAt: timestamp('finished_at', { withTimezone: true }),
+  timeLimitSeconds: integer('time_limit_seconds'),
+});
+
+export type Test = typeof tests.$inferSelect;
+export type NewTest = typeof tests.$inferInsert;