data fixes, partial custom indicator support

sandbox/Dockerfile

@@ -40,6 +40,7 @@ WORKDIR /app
 # Install runtime dependencies only
 RUN apt-get update && apt-get install -y --no-install-recommends \
     libzmq5 \
+    git \
     && rm -rf /var/lib/apt/lists/*
 
 # Create non-root user
@@ -76,6 +77,7 @@ USER dexorder
 # Environment variables (can be overridden in k8s)
 ENV PYTHONUNBUFFERED=1 \
     MPLCONFIGDIR=/tmp \
+    NUMBA_CACHE_DIR=/tmp/numba_cache \
     LOG_LEVEL=INFO \
     CONFIG_PATH=/app/config/config.yaml \
     SECRETS_PATH=/app/config/secrets.yaml \