chore: Update dependencies and task list

database.py

@@ -0,0 +1,19 @@
+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+# Define the location of our SQLite database file.
+# The ./. indicates it will be in the same directory as our project.
+SQLALCHEMY_DATABASE_URL = "sqlite:///./multichat_overlay.db"
+
+# Create the SQLAlchemy engine. The `connect_args` is needed only for SQLite
+# to allow it to be used by multiple threads, which FastAPI does.
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
+)
+
+# Each instance of SessionLocal will be a database session.
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+# This Base will be used by our model classes to inherit from.
+Base = declarative_base()