feat: basic download tracking in db

db.py

@@ -0,0 +1,34 @@
+from sqlalchemy import Column, String, Integer, Boolean, create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker, scoped_session
+
+Base = declarative_base()
+
+class Download(Base):
+
+    __tablename__ = 'files'
+
+    path = Column(String, primary_key=True)
+    size = Column(Integer)
+    type = Column(String)
+    finished = Column(Boolean)
+
+class Database:
+    def __init__(self, db_url="sqlite:///database.db"):
+        self.engine = create_engine(db_url, echo=True)
+        self.session_factory = sessionmaker(bind=self.engine)
+        self.Session = scoped_session(self.session_factory)  # Thread-safe sessions
+
+        # Automatically create tables
+        Base.metadata.create_all(self.engine)
+
+    def session(self):
+        """Returns a new session (or an existing one if in the same thread)."""
+        return self.Session()
+
+    def close_session(self):
+        """Closes the current session."""
+        self.Session.remove()
+
+# Singleton instance of Database
+db = Database()