Add role-based filtering and imporve code

services/sales/Dockerfile

@@ -17,9 +17,13 @@ RUN apt-get update && apt-get install -y \
     && rm -rf /var/lib/apt/lists/*
 
 # Copy requirements
+COPY shared/requirements-tracing.txt /tmp/
+
 COPY services/sales/requirements.txt .
 
 # Install Python dependencies
+RUN pip install --no-cache-dir -r /tmp/requirements-tracing.txt
+
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy shared libraries from the shared stage