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apps/server/src/db/client.ts

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+/**
+ * Database client and connection pool
+ */
+
+import { drizzle } from 'drizzle-orm/node-postgres';
+import { migrate } from 'drizzle-orm/node-postgres/migrator';
+import pg from 'pg';
+import * as schema from './schema.js';
+
+const { Pool } = pg;
+
+if (!process.env.DATABASE_URL) {
+  throw new Error('DATABASE_URL environment variable is required');
+}
+
+const pool = new Pool({
+  connectionString: process.env.DATABASE_URL,
+  max: 20,                        // Maximum connections
+  idleTimeoutMillis: 20000,       // Close idle connections after 20s
+  connectionTimeoutMillis: 10000, // Connection timeout (increased for complex queries)
+  maxUses: 7500,                  // Max queries per connection before refresh (prevents memory leaks)
+  allowExitOnIdle: false,         // Keep pool alive during idle periods
+});
+
+// Log pool errors for debugging
+pool.on('error', (err) => {
+  console.error('[DB Pool Error]', err.message);
+});
+
+export const db = drizzle(pool, { schema });
+
+export async function closeDatabase(): Promise<void> {
+  await pool.end();
+}
+
+export async function checkDatabaseConnection(): Promise<boolean> {
+  try {
+    const client = await pool.connect();
+    await client.query('SELECT 1');
+    client.release();
+    return true;
+  } catch (error) {
+    console.error('Database connection check failed:', error);
+    return false;
+  }
+}
+
+export async function runMigrations(migrationsFolder: string): Promise<void> {
+  await migrate(db, { migrationsFolder });
+}