refactor(chart): Added docstring in each file and function. Fixed long lines

chart/database/server.py

@@ -1,9 +1,27 @@
-import asyncpg
-import yaml
+"""
+This module initializes the database connection pool using asyncpg.
 
-config = yaml.safe_load(open("config.yaml", "r"))
+It reads database configuration from a YAML file and creates a connection pool
+that can be used throughout the application for database operations.
+"""
+
+import asyncpg
+
+from chart.utils.load_config import load_config
+
+config = load_config('config.yaml')
 
 async def create_pool() -> asyncpg.pool.Pool:
+    """
+    Creates and returns a connection pool for the PostgreSQL database.
+
+    The function uses configuration settings loaded from a YAML file to
+    establish the connection pool. The pool allows multiple database
+    connections to be reused efficiently across the application.
+
+    Returns:
+        asyncpg.pool.Pool: The connection pool object.
+    """
     pool = await asyncpg.create_pool(
         user=config['database']['user'],
         password=config['database']['password'],
@@ -14,4 +32,4 @@ async def create_pool() -> asyncpg.pool.Pool:
         max_size=20
     )
 
-    return pool
+    return pool