add dgraph backend to benchmark suite with safe type assertions for multi-backend support

cmd/benchmark/run-badger-benchmark.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Run Badger benchmark with reduced cache sizes to avoid OOM
+
+# Set reasonable cache sizes for benchmark
+export ORLY_DB_BLOCK_CACHE_MB=256   # Reduced from 1024MB
+export ORLY_DB_INDEX_CACHE_MB=128   # Reduced from 512MB
+export ORLY_QUERY_CACHE_SIZE_MB=128 # Reduced from 512MB
+
+# Clean up old data
+rm -rf /tmp/benchmark_db_badger
+
+echo "Running Badger benchmark with reduced cache sizes:"
+echo "  Block Cache: ${ORLY_DB_BLOCK_CACHE_MB}MB"
+echo "  Index Cache: ${ORLY_DB_INDEX_CACHE_MB}MB"
+echo "  Query Cache: ${ORLY_QUERY_CACHE_SIZE_MB}MB"
+echo ""
+
+# Run benchmark
+./benchmark -events "${1:-1000}" -workers "${2:-4}" -datadir /tmp/benchmark_db_badger