Add env variables support

backend/model.py

@@ -3,9 +3,10 @@ from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import sessionmaker
 from sqlalchemy.sql.functions import func
 from sqlalchemy.sql.sqltypes import DateTime
+import os
 
 # Initialize the database
-DATABASE_URL = "sqlite:///./project_monitor.db"
+DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./project_monitor.db")
 
 # SQLAlchemy setup
 engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})