add sqlmodel + alembic + setup models skeleton to slowly enable transition towards a db

crawler/database.py

@@ -0,0 +1,14 @@
+from sqlmodel import create_engine, SQLModel
+from sqlalchemy.orm import sessionmaker
+
+# PostgreSQL example (or use "sqlite:///database.db" for SQLite)
+# DATABASE_URL = "postgresql://user:password@localhost/db_name"
+DATABASE_URL = "sqlite:///data/wrongmove.db"
+
+engine = create_engine(DATABASE_URL, echo=True)  # `echo=True` for debug logs
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def init_db():
+    """Create all tables (only for development; use migrations in production)."""
+    SQLModel.metadata.create_all(engine)