Add first info to landing page

src/allmende_payment_system/database.py

@@ -1,6 +1,29 @@
-from sqlalchemy import create_engine
-from sqlalchemy.orm import sessionmaker
+from sqlalchemy import create_engine, select
+from sqlalchemy.orm import Session, sessionmaker
+
+from allmende_payment_system.models import User
 
 SQLALCHEMY_DATABASE_URL = "sqlite:///./aps_db.db"
 engine = create_engine(SQLALCHEMY_DATABASE_URL)
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def create_tables():
+    from allmende_payment_system.models import Base
+
+    Base.metadata.create_all(bind=engine)
+
+
+def ensure_user(user_info: dict, session: Session) -> User:
+    statement = select(User).where(User.username == user_info["username"])
+
+    if user := session.scalars(statement).one_or_none():
+        return user
+
+    user = User(
+        username=user_info["username"], display_name=user_info.get("display_name")
+    )
+    session.add(user)
+    session.commit()
+
+    return user