diff --git a/src/elexam_core/.gitkeep b/src/elexam_core/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/src/.gitkeep b/src/elexam_core/__init__.py
similarity index 100%
rename from src/.gitkeep
rename to src/elexam_core/__init__.py
diff --git a/src/elexam_core/context.py b/src/elexam_core/context.py
new file mode 100644
index 0000000..3e3092d
--- /dev/null
+++ b/src/elexam_core/context.py
@@ -0,0 +1,3 @@
+from contextvars import ContextVar
+
+trace_id_context: ContextVar[str | None] = ContextVar("trace_id", default=None)
\ No newline at end of file