Fix HF DBpedia proxy to use DBpedia named graph

configs/default.yaml

@@ -55,7 +55,7 @@ selection_weights:
 # ── Dataset configs ──────────────────────────────────────────
 datasets:
   "https://text2sparql.aksw.org/2026/dbpedia/":
-    endpoint_url: "http://localhost:8890/sparql"
+    endpoint_url: "http://localhost:8890/sparql?default-graph-uri=http://dbpedia.org"
     kg_profile_path: "kg_profiles/dbpedia_schema.json"
     mode: "dbpedia"
     default_prefixes:
@@ -85,7 +85,7 @@ datasets:
 
   # Legacy 2025 IDs for backwards compatibility
   "https://text2sparql.aksw.org/2025/dbpedia/":
-    endpoint_url: "http://localhost:8890/sparql"
+    endpoint_url: "http://localhost:8890/sparql?default-graph-uri=http://dbpedia.org"
     kg_profile_path: "kg_profiles/dbpedia_schema.json"
     mode: "dbpedia"
     default_prefixes:

scripts/hf_space_boot.sh

@@ -5,7 +5,7 @@ cd /app
 export PYTHONPATH=/app:${PYTHONPATH:-}
 
 # Serve both challenge datasets from the same local Virtuoso endpoint.
-export DBPEDIA_ENDPOINT_URL="${DBPEDIA_ENDPOINT_URL:-http://127.0.0.1:8890/sparql}"
+export DBPEDIA_ENDPOINT_URL="${DBPEDIA_ENDPOINT_URL:-http://127.0.0.1:8890/sparql?default-graph-uri=http://dbpedia.org}"
 export CORPORATE_GRAPH_URI="${CORPORATE_GRAPH_URI:-http://ld.company.org/prod}"
 export CORPORATE_ENDPOINT_URL="${CORPORATE_ENDPOINT_URL:-http://127.0.0.1:8890/sparql?default-graph-uri=http://dbpedia.org&default-graph-uri=${CORPORATE_GRAPH_URI}}"
 export PORT="${PORT:-7860}"