chore: sync submodule state (parent ref update)

Made-with: Cursor

services/token-aggregation/src/database/client.ts

@@ -0,0 +1,53 @@
+import { Pool, PoolConfig } from 'pg';
+import * as dotenv from 'dotenv';
+
+dotenv.config();
+
+let pool: Pool | null = null;
+
+export interface DatabaseConfig {
+  connectionString?: string;
+  host?: string;
+  port?: number;
+  database?: string;
+  user?: string;
+  password?: string;
+  min?: number;
+  max?: number;
+}
+
+export function getDatabasePool(): Pool {
+  if (pool) {
+    return pool;
+  }
+
+  const config: PoolConfig = {
+    connectionString: process.env.DATABASE_URL,
+    min: parseInt(process.env.DATABASE_POOL_MIN || '2', 10),
+    max: parseInt(process.env.DATABASE_POOL_MAX || '10', 10),
+  };
+
+  // If connectionString is not provided, use individual config
+  if (!config.connectionString) {
+    config.host = process.env.DB_HOST || 'localhost';
+    config.port = parseInt(process.env.DB_PORT || '5432', 10);
+    config.database = process.env.DB_NAME || 'explorer_db';
+    config.user = process.env.DB_USER || 'postgres';
+    config.password = process.env.DB_PASSWORD || '';
+  }
+
+  pool = new Pool(config);
+
+  pool.on('error', (err) => {
+    console.error('Unexpected error on idle database client', err);
+  });
+
+  return pool;
+}
+
+export async function closeDatabasePool(): Promise<void> {
+  if (pool) {
+    await pool.end();
+    pool = null;
+  }
+}