chore(milestone-2-enhancements): Add proper seeding behavior

Signed-off-by: SeeuSim <[email protected]>

Author: SeeuSim

backend/question/drizzle/0000_bizarre_midnight.sql renamed to backend/question/drizzle/0000_initial_schema.sql

@@ -6,7 +6,7 @@
       "idx": 0,
       "version": "7",
       "when": 1727595727110,
-      "tag": "0000_bizarre_midnight",
+      "tag": "0000_initial_schema",
       "breakpoints": true
     }
   ]

backend/question/drizzle/meta/_journal.json

@@ -10,7 +10,8 @@
     "build:prod": "env-cmd -f .env.prod tsc && tsc-alias",
     "start:prod": "env-cmd -f .env.local node dist/index.js",
     "db:generate": "env-cmd -f .env.local drizzle-kit generate",
-    "db:migrate": "env-cmd -f .env.local tsx drizzle.migrate.ts",
+    "db:migrate": "env-cmd -f .env.local tsx ./src/lib/db/migrate.ts",
+    "db:seed": "env-cmd -f .env.local tsx ./src/lib/db/seed.ts",
     "db:inspect": "env-cmd -f .env.local drizzle-kit studio",
     "fmt": "prettier --config .prettierrc src --write",
     "test": "echo \"Error: no test specified\" && exit 1"

backend/question/package.json

@@ -0,0 +1,43 @@
+import { sql } from 'drizzle-orm';
+
+import { db, questions } from '@/lib/db';
+import { questionData } from './sample-data/questions';
+
+const seedQuestions = async () => {
+  try {
+    await db.transaction(async (trx) => {
+      // Delete all questions (not table)
+      await trx.delete(questions);
+
+      // Reset Serial to start index 1
+      await trx.execute(sql`
+      SELECT setval(
+          pg_get_serial_sequence('questions', 'id'),
+          COALESCE(max(id) + 1, 1), 
+          false
+      )
+      FROM questions;  
+      `);
+
+      for (const question of questionData) {
+        await trx
+          .insert(questions)
+          .values({ ...question, id: undefined }) // Let DB set ID
+          .onConflictDoNothing();
+      }
+    });
+  } catch (error) {
+    console.log('Error seeding question data', error);
+    process.exit(1);
+  }
+};
+
+void seedQuestions()
+  .then(() => {
+    console.log('Seeding completed successfully.');
+    process.exit(0);
+  })
+  .catch((error) => {
+    console.error('Error during seeding:', error);
+    process.exit(1);
+  });