feat: Add database connection pool with automatic database creation and initialization

- Implemented `Client` class to manage database connections and initialization.
- Integrated `ConnectionPool` class to handle database connection pooling using `pg` library.
- Added error handling for failed database connections using custom `Catch` decorator.
- Added functionality to automatically create the database if it doesn't exist.
- Implemented `initialize` method in `Client` to connect, initialize, and seed database tables.
- Encapsulated database connection logic in `ConnectionPool` with methods for connecting, creating a database, and retrieving a client.

This feature provides an organized approach to managing database connections and ensures that the database is properly initialized and seeded on first use.

Author: m-mdy-m

src/database/Client.ts

@@ -0,0 +1,20 @@
+import { ConnectionPool } from './ConnectionPool';
+import { TablesService } from './service/tables/Tables';
+export class Client {
+  private _connectionPool: ConnectionPool;
+  constructor() {
+    this._connectionPool = new ConnectionPool();
+  }
+  async initialize() {
+    await this._connectionPool.connect();
+    const tablesService = new TablesService(this._connectionPool);
+    console.log('connect database');
+    await tablesService.initialTables();
+    console.log('Initial Tables');
+    await tablesService.seedTables();
+    console.log('Initial Seed Tables');
+  }
+  getConnectionPool(): ConnectionPool {
+    return this._connectionPool;
+  }
+}

src/database/ConnectionPool.ts

@@ -53,7 +53,7 @@ export class ConnectionPool {
     return url || `postgresql://${user}:${password}@${host}:${port}/${databaseName}`;
   }
   async getClient(): Promise<PoolClient> {
-    return this._pool.connect();
+    return await this._pool.connect();
   }
 
   async close(): Promise<void> {