feat: Conditionally initialize database connection pool with error handling and raise an HTTP exception if not configured.

main.py

@@ -39,15 +39,24 @@ def configure_conn(conn):
 
 # By using a ConnectionPool, we keep the TCP connection alive to Neon.
 # This eliminates the ~6-8 second TLS/SSL handshake delay on every request.
-db_pool = ConnectionPool(
-    conninfo=DATABASE_URL, 
-    configure=configure_conn, 
-    min_size=1, 
-    max_size=5,
-    timeout=30.0
-)
+db_pool = None
+if DATABASE_URL:
+    try:
+        db_pool = ConnectionPool(
+            conninfo=DATABASE_URL, 
+            configure=configure_conn, 
+            min_size=1, 
+            max_size=5,
+            timeout=30.0
+        )
+    except Exception as e:
+        print(f"WARNING: Failed to initialize database pool: {e}")
+else:
+    print("WARNING: DATABASE_URL is not set. Database connections will fail.")
 
 def get_db_connection():
+    if not db_pool:
+        raise HTTPException(status_code=500, detail="Database is not configured or failed to connect. Please set DATABASE_URL in Hugging Face Spaces Settings -> Variables and secrets.")
     return db_pool.connection()
 
 def extract_face_embedding(file_bytes: bytes) -> tuple[list[float], str]: