added some new features. (Showing student's reviews and courses, Show course reviews, Show Top Courses with a tag or in a category, skipping optional fields when creating entity)

database/connection.py

@@ -5,28 +5,26 @@ from psycopg2 import pool
 
 logger = logging.getLogger(__name__)
 
-# Connection pool for reusing connections (important for serverless!)
+# Connection pool for reusing connections
 _connection_pool = None
 
+
 def get_connection_pool():
     """Create a connection pool"""
     global _connection_pool
     if _connection_pool is None:
         try:
-            # --- Production settings
-            # DATABASE_URL = os.environ.get("DATABASE_URL")
-            # _connection_pool = psycopg2.pool.SimpleConnectionPool(1, 5, DATABASE_URL);
-            
-            # --- Development settings
-            dev_url = "postgresql://postgres:123@localhost:5432/OLP"
-            _connection_pool = psycopg2.pool.SimpleConnectionPool(1, 5, dev_url);
-            
+            DATABASE_URL = os.environ.get("DATABASE_URL")
+            _connection_pool = psycopg2.pool.SimpleConnectionPool(
+                1, 5, DATABASE_URL)
+
             logger.info("Database connection pool created")
         except Exception as e:
             logger.error(f"Failed to create connection pool: {e}")
             return None
     return _connection_pool
 
+
 def get_db_connection():
     """Get a connection from the pool"""
     try:
@@ -39,6 +37,7 @@ def get_db_connection():
         logger.error(f"Database connection error: {e}")
         return None
 
+
 def release_db_connection(conn):
     """Return connection to the pool"""
     try:
@@ -46,4 +45,4 @@ def release_db_connection(conn):
         if pool and conn:
             pool.putconn(conn)
     except Exception as e:
-        logger.error(f"Error releasing connection: {e}")
+        logger.error(f"Error releasing connection: {e}")