diff --git a/cmd/goyco/commands/common.go b/cmd/goyco/commands/common.go
index 4b3e410..0f38729 100644
--- a/cmd/goyco/commands/common.go
+++ b/cmd/goyco/commands/common.go
@@ -113,15 +113,15 @@ func truncate(in string, max int) string {
 	return in[:max-3] + "..."
 }
 
-func outputJSON(v interface{}) error {
+func outputJSON(v any) error {
 	encoder := json.NewEncoder(os.Stdout)
 	encoder.SetIndent("", "  ")
 	return encoder.Encode(v)
 }
 
-func outputWarning(message string, args ...interface{}) {
+func outputWarning(message string, args ...any) {
 	if IsJSONOutput() {
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"warning": fmt.Sprintf(message, args...),
 		})
 	} else {
diff --git a/cmd/goyco/commands/common_test.go b/cmd/goyco/commands/common_test.go
index ba51ebe..ff63bba 100644
--- a/cmd/goyco/commands/common_test.go
+++ b/cmd/goyco/commands/common_test.go
@@ -236,7 +236,7 @@ func TestSetJSONOutput(t *testing.T) {
 		done := make(chan bool)
 
 		go func() {
-			for i := 0; i < 100; i++ {
+			for range 100 {
 				SetJSONOutput(true)
 				_ = IsJSONOutput()
 				SetJSONOutput(false)
@@ -245,7 +245,7 @@ func TestSetJSONOutput(t *testing.T) {
 		}()
 
 		go func() {
-			for i := 0; i < 100; i++ {
+			for range 100 {
 				_ = IsJSONOutput()
 			}
 			done <- true
diff --git a/cmd/goyco/commands/daemon.go b/cmd/goyco/commands/daemon.go
index f1b46ba..715f271 100644
--- a/cmd/goyco/commands/daemon.go
+++ b/cmd/goyco/commands/daemon.go
@@ -87,7 +87,7 @@ func runStatusCommand(cfg *config.Config) error {
 
 	if !isDaemonRunning(pidFile) {
 		if IsJSONOutput() {
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"status": "not_running",
 			})
 		} else {
@@ -99,7 +99,7 @@ func runStatusCommand(cfg *config.Config) error {
 	data, err := os.ReadFile(pidFile)
 	if err != nil {
 		if IsJSONOutput() {
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"status": "running",
 				"error":  fmt.Sprintf("PID file exists but cannot be read: %v", err),
 			})
@@ -112,7 +112,7 @@ func runStatusCommand(cfg *config.Config) error {
 	pid, err := strconv.Atoi(string(data))
 	if err != nil {
 		if IsJSONOutput() {
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"status": "running",
 				"error":  fmt.Sprintf("PID file exists but contains invalid PID: %v", err),
 			})
@@ -123,7 +123,7 @@ func runStatusCommand(cfg *config.Config) error {
 	}
 
 	if IsJSONOutput() {
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"status": "running",
 			"pid":    pid,
 		})
@@ -171,7 +171,7 @@ func stopDaemon(cfg *config.Config) error {
 	_ = os.Remove(pidFile)
 
 	if IsJSONOutput() {
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"action": "stopped",
 			"pid":    pid,
 		})
@@ -219,7 +219,7 @@ func runDaemon(cfg *config.Config) error {
 			return fmt.Errorf("cannot write PID file: %w", err)
 		}
 		if IsJSONOutput() {
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"action":   "started",
 				"pid":      pid,
 				"pid_file": pidFile,
diff --git a/cmd/goyco/commands/post.go b/cmd/goyco/commands/post.go
index 8ef6d84..03fff3d 100644
--- a/cmd/goyco/commands/post.go
+++ b/cmd/goyco/commands/post.go
@@ -91,7 +91,7 @@ func postDelete(repo repositories.PostRepository, args []string) error {
 	}
 
 	if IsJSONOutput() {
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"action": "post_deleted",
 			"id":     id,
 		})
@@ -158,7 +158,7 @@ func postList(postQueries *services.PostQueries, args []string) error {
 				CreatedAt: p.CreatedAt.Format("2006-01-02 15:04:05"),
 			}
 		}
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"posts": postsJSON,
 			"count": len(postsJSON),
 		})
@@ -298,7 +298,7 @@ func postSearch(postQueries *services.PostQueries, args []string) error {
 				CreatedAt: p.CreatedAt.Format("2006-01-02 15:04:05"),
 			}
 		}
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"search_term": sanitizedTerm,
 			"posts":       postsJSON,
 			"count":       len(postsJSON),
diff --git a/cmd/goyco/commands/progress_indicator_test.go b/cmd/goyco/commands/progress_indicator_test.go
index 8049088..a36a1ef 100644
--- a/cmd/goyco/commands/progress_indicator_test.go
+++ b/cmd/goyco/commands/progress_indicator_test.go
@@ -508,9 +508,9 @@ func TestProgressIndicator_Concurrency(t *testing.T) {
 	pi := NewProgressIndicator(100, "Concurrent test")
 	done := make(chan bool)
 
-	for i := 0; i < 10; i++ {
+	for range 10 {
 		go func() {
-			for j := 0; j < 10; j++ {
+			for range 10 {
 				pi.Increment()
 				time.Sleep(1 * time.Millisecond)
 			}
@@ -518,7 +518,7 @@ func TestProgressIndicator_Concurrency(t *testing.T) {
 		}()
 	}
 
-	for i := 0; i < 10; i++ {
+	for range 10 {
 		<-done
 	}
 
diff --git a/cmd/goyco/commands/prune.go b/cmd/goyco/commands/prune.go
index 32675fb..1482c23 100644
--- a/cmd/goyco/commands/prune.go
+++ b/cmd/goyco/commands/prune.go
@@ -95,7 +95,7 @@ func prunePosts(postRepo repositories.PostRepository, args []string) error {
 			}
 		}
 		if *dryRun {
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"action":  "prune_posts",
 				"dry_run": true,
 				"posts":   postsJSON,
@@ -110,7 +110,7 @@ func prunePosts(postRepo repositories.PostRepository, args []string) error {
 		if err != nil {
 			return fmt.Errorf("hard delete posts: %w", err)
 		}
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"action":        "prune_posts",
 			"deleted_count": deletedCount,
 		})
@@ -178,7 +178,7 @@ func pruneUsers(userRepo repositories.UserRepository, postRepo repositories.Post
 	userCount := len(users)
 	if userCount == 0 {
 		if IsJSONOutput() {
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"action": "prune_users",
 				"count":  0,
 			})
@@ -211,7 +211,7 @@ func pruneUsers(userRepo repositories.UserRepository, postRepo repositories.Post
 			}
 		}
 		if *dryRun {
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"action":     "prune_users",
 				"dry_run":    true,
 				"users":      usersJSON,
@@ -229,7 +229,7 @@ func pruneUsers(userRepo repositories.UserRepository, postRepo repositories.Post
 			if err != nil {
 				return fmt.Errorf("hard delete all users and posts: %w", err)
 			}
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"action":        "prune_users",
 				"deleted_count": totalDeleted,
 				"with_posts":    true,
@@ -242,7 +242,7 @@ func pruneUsers(userRepo repositories.UserRepository, postRepo repositories.Post
 				}
 				deletedCount++
 			}
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"action":        "prune_users",
 				"deleted_count": deletedCount,
 				"with_posts":    false,
@@ -328,7 +328,7 @@ func pruneAll(userRepo repositories.UserRepository, postRepo repositories.PostRe
 
 	if IsJSONOutput() {
 		if *dryRun {
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"action":     "prune_all",
 				"dry_run":    true,
 				"user_count": len(userCount),
@@ -343,7 +343,7 @@ func pruneAll(userRepo repositories.UserRepository, postRepo repositories.PostRe
 		if err != nil {
 			return fmt.Errorf("hard delete all: %w", err)
 		}
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"action":        "prune_all",
 			"deleted_count": totalDeleted,
 		})
diff --git a/cmd/goyco/commands/seed.go b/cmd/goyco/commands/seed.go
index 6276b9b..dc2b80c 100644
--- a/cmd/goyco/commands/seed.go
+++ b/cmd/goyco/commands/seed.go
@@ -321,7 +321,7 @@ func createUsers(g *seedGenerator, userRepo repositories.UserRepository, count i
 	}
 	progress := maybeProgress(count, desc)
 	users := make([]database.User, 0, count)
-	for i := 0; i < count; i++ {
+	for i := range count {
 		user, err := g.createSingleUser(userRepo, i+1)
 		if err != nil {
 			return nil, fmt.Errorf("create random user: %w", err)
@@ -343,7 +343,7 @@ func createPosts(g *seedGenerator, postRepo repositories.PostRepository, authorI
 	}
 	progress := maybeProgress(count, desc)
 	posts := make([]database.Post, 0, count)
-	for i := 0; i < count; i++ {
+	for i := range count {
 		post, err := g.createSinglePost(postRepo, authorID, i+1)
 		if err != nil {
 			return nil, fmt.Errorf("create random post: %w", err)
diff --git a/cmd/goyco/commands/user.go b/cmd/goyco/commands/user.go
index 04b19d6..8ca00bc 100644
--- a/cmd/goyco/commands/user.go
+++ b/cmd/goyco/commands/user.go
@@ -169,7 +169,7 @@ func userCreate(cfg *config.Config, repo repositories.UserRepository, args []str
 	}
 
 	if IsJSONOutput() {
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"action":   "user_created",
 			"id":       user.ID,
 			"username": user.Username,
@@ -296,7 +296,7 @@ func userUpdate(cfg *config.Config, repo repositories.UserRepository, refreshTok
 	}
 
 	if IsJSONOutput() {
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"action":   "user_updated",
 			"id":       user.ID,
 			"username": user.Username,
@@ -424,7 +424,7 @@ func userDelete(cfg *config.Config, repo repositories.UserRepository, args []str
 	}
 
 	if IsJSONOutput() {
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"action":        "user_deleted",
 			"id":            id,
 			"username":      user.Username,
@@ -479,7 +479,7 @@ func userList(repo repositories.UserRepository, args []string) error {
 				CreatedAt: u.CreatedAt.Format("2006-01-02 15:04:05"),
 			}
 		}
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"users": usersJSON,
 			"count": len(usersJSON),
 		})
@@ -578,7 +578,7 @@ func userLock(cfg *config.Config, repo repositories.UserRepository, args []strin
 
 	if user.Locked {
 		if IsJSONOutput() {
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"action":   "user_lock",
 				"id":       id,
 				"username": user.Username,
@@ -604,7 +604,7 @@ func userLock(cfg *config.Config, repo repositories.UserRepository, args []strin
 	}
 
 	if IsJSONOutput() {
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"action":     "user_locked",
 			"id":         id,
 			"username":   user.Username,
@@ -653,7 +653,7 @@ func userUnlock(cfg *config.Config, repo repositories.UserRepository, args []str
 
 	if !user.Locked {
 		if IsJSONOutput() {
-			outputJSON(map[string]interface{}{
+			outputJSON(map[string]any{
 				"action":   "user_unlock",
 				"id":       id,
 				"username": user.Username,
@@ -679,7 +679,7 @@ func userUnlock(cfg *config.Config, repo repositories.UserRepository, args []str
 	}
 
 	if IsJSONOutput() {
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"action":     "user_unlocked",
 			"id":         id,
 			"username":   user.Username,
@@ -732,7 +732,7 @@ func resetUserPassword(cfg *config.Config, repo repositories.UserRepository, ses
 	}
 
 	if IsJSONOutput() {
-		outputJSON(map[string]interface{}{
+		outputJSON(map[string]any{
 			"action":   "password_reset",
 			"id":       userID,
 			"username": user.Username,