Remove Dgraph support from the codebase.

Dgraph-related functionality, configuration, and benchmarks have been removed from the project. This streamlines the codebase to focus on supported backends, specifically eliminating Dgraph references in favor of Neo4j and other implementations. Version bumped to reflect the changes.

cmd/benchmark/main.go

@@ -42,7 +42,6 @@ type BenchmarkConfig struct {
 	NetRate    int // events/sec per worker
 
 	// Backend selection
-	UseDgraph     bool
 	UseNeo4j      bool
 	UseRelySQLite bool
 }
@@ -115,12 +114,6 @@ func main() {
 		return
 	}
 
-	if config.UseDgraph {
-		// Run dgraph benchmark
-		runDgraphBenchmark(config)
-		return
-	}
-
 	if config.UseNeo4j {
 		// Run Neo4j benchmark
 		runNeo4jBenchmark(config)
@@ -152,28 +145,6 @@ func main() {
 	benchmark.GenerateAsciidocReport()
 }
 
-func runDgraphBenchmark(config *BenchmarkConfig) {
-	fmt.Printf("Starting Nostr Relay Benchmark (Dgraph Backend)\n")
-	fmt.Printf("Data Directory: %s\n", config.DataDir)
-	fmt.Printf(
-		"Events: %d, Workers: %d\n",
-		config.NumEvents, config.ConcurrentWorkers,
-	)
-
-	dgraphBench, err := NewDgraphBenchmark(config)
-	if err != nil {
-		log.Fatalf("Failed to create dgraph benchmark: %v", err)
-	}
-	defer dgraphBench.Close()
-
-	// Run dgraph benchmark suite
-	dgraphBench.RunSuite()
-
-	// Generate reports
-	dgraphBench.GenerateReport()
-	dgraphBench.GenerateAsciidocReport()
-}
-
 func runNeo4jBenchmark(config *BenchmarkConfig) {
 	fmt.Printf("Starting Nostr Relay Benchmark (Neo4j Backend)\n")
 	fmt.Printf("Data Directory: %s\n", config.DataDir)
@@ -254,10 +225,6 @@ func parseFlags() *BenchmarkConfig {
 	flag.IntVar(&config.NetRate, "net-rate", 20, "Events per second per worker")
 
 	// Backend selection
-	flag.BoolVar(
-		&config.UseDgraph, "dgraph", false,
-		"Use dgraph backend (requires Docker)",
-	)
 	flag.BoolVar(
 		&config.UseNeo4j, "neo4j", false,
 		"Use Neo4j backend (requires Docker)",