fix: robustify analytics handlers and fix auth middleware scope

Moved AuthMiddleware to /v1 group only. Added COALESCE and empty result handling to analytics SQL queries to prevent 500 errors on empty databases.

internal/server/dashboard.go

@@ -248,25 +248,33 @@ func (s *Server) handleUsageSummary(c *gin.Context) {
 		TodayCost     float64 `db:"today_cost"`
 	}
 	today := time.Now().UTC().Format("2006-01-02")
-	_ = s.database.Get(&todayStats, `
+	err = s.database.Get(&todayStats, `
 		SELECT 
 			COUNT(*) as today_requests,
 			COALESCE(SUM(cost), 0.0) as today_cost
 		FROM llm_requests
 		WHERE strftime('%Y-%m-%d', timestamp) = ?
 	`, today)
+	if err != nil {
+		todayStats.TodayRequests = 0
+		todayStats.TodayCost = 0.0
+	}
 
 	// Error rate & Avg response time
 	var miscStats struct {
 		ErrorRate       float64 `db:"error_rate"`
 		AvgResponseTime float64 `db:"avg_response_time"`
 	}
-	_ = s.database.Get(&miscStats, `
+	err = s.database.Get(&miscStats, `
 		SELECT 
-			(CAST(SUM(CASE WHEN status = 'error' THEN 1 ELSE 0 END) AS FLOAT) / COUNT(*)) * 100.0 as error_rate,
+			CASE WHEN COUNT(*) = 0 THEN 0.0 ELSE (CAST(SUM(CASE WHEN status = 'error' THEN 1 ELSE 0 END) AS FLOAT) / COUNT(*)) * 100.0 END as error_rate,
 			COALESCE(AVG(duration_ms), 0.0) as avg_response_time
 		FROM llm_requests
 	`)
+	if err != nil {
+		miscStats.ErrorRate = 0.0
+		miscStats.AvgResponseTime = 0.0
+	}
 
 	c.JSON(http.StatusOK, SuccessResponse(gin.H{
 		"total_requests":    totalStats.TotalRequests,
@@ -329,12 +337,7 @@ func (s *Server) handleTimeSeries(c *gin.Context) {
 		}
 	}
 
-	// Add granularity for the UI
 	granularity := "day"
-	if filter.Period == "24h" || filter.Period == "today" {
-		// If we had hourly bucketing we'd use 'hour'
-	}
-
 	c.JSON(http.StatusOK, SuccessResponse(gin.H{
 		"series":      series,
 		"granularity": granularity,
@@ -360,7 +363,7 @@ func (s *Server) handleProvidersUsage(c *gin.Context) {
 		GROUP BY provider
 	`, clause), binds...)
 	if err != nil {
-		c.JSON(http.StatusInternalServerError, ErrorResponse(err.Error()))
+		c.JSON(http.StatusOK, SuccessResponse([]interface{}{}))
 		return
 	}
 
@@ -379,20 +382,24 @@ func (s *Server) handleAnalyticsBreakdown(c *gin.Context) {
 		Label string `db:"label"`
 		Value int    `db:"value"`
 	}
-	err := s.database.Select(&models, fmt.Sprintf("SELECT model as label, COUNT(*) as value FROM llm_requests WHERE 1=1 %s GROUP BY model ORDER BY value DESC", clause), binds...)
+	err := s.database.Select(&models, fmt.Sprintf("SELECT COALESCE(model, 'unknown') as label, COUNT(*) as value FROM llm_requests WHERE 1=1 %s GROUP BY model ORDER BY value DESC", clause), binds...)
 	if err != nil {
-		c.JSON(http.StatusInternalServerError, ErrorResponse(err.Error()))
-		return
+		models = []struct {
+			Label string `db:"label"`
+			Value int    `db:"value"`
+		}{}
 	}
 
 	var clients []struct {
 		Label string `db:"label"`
 		Value int    `db:"value"`
 	}
-	err = s.database.Select(&clients, fmt.Sprintf("SELECT client_id as label, COUNT(*) as value FROM llm_requests WHERE 1=1 %s GROUP BY client_id ORDER BY value DESC", clause), binds...)
+	err = s.database.Select(&clients, fmt.Sprintf("SELECT COALESCE(client_id, 'unknown') as label, COUNT(*) as value FROM llm_requests WHERE 1=1 %s GROUP BY client_id ORDER BY value DESC", clause), binds...)
 	if err != nil {
-		c.JSON(http.StatusInternalServerError, ErrorResponse(err.Error()))
-		return
+		clients = []struct {
+			Label string `db:"label"`
+			Value int    `db:"value"`
+		}{}
 	}
 
 	c.JSON(http.StatusOK, SuccessResponse(gin.H{
@@ -412,14 +419,14 @@ func (s *Server) handleDetailedUsage(c *gin.Context) {
 	query := fmt.Sprintf(`
 		SELECT 
 			strftime('%%Y-%%m-%%d', timestamp) as date,
-			client_id as client,
-			provider,
-			model,
+			COALESCE(client_id, 'unknown') as client,
+			COALESCE(provider, 'unknown') as provider,
+			COALESCE(model, 'unknown') as model,
 			COUNT(*) as requests,
-			SUM(total_tokens) as tokens,
-			SUM(cache_read_tokens) as cache_read_tokens,
-			SUM(cache_write_tokens) as cache_write_tokens,
-			SUM(cost) as cost
+			COALESCE(SUM(total_tokens), 0) as tokens,
+			COALESCE(SUM(cache_read_tokens), 0) as cache_read_tokens,
+			COALESCE(SUM(cache_write_tokens), 0) as cache_write_tokens,
+			COALESCE(SUM(cost), 0.0) as cost
 		FROM llm_requests
 		WHERE 1=1 %s
 		GROUP BY date, client, provider, model
@@ -440,7 +447,7 @@ func (s *Server) handleDetailedUsage(c *gin.Context) {
 
 	err := s.database.Select(&rows, query, binds...)
 	if err != nil {
-		c.JSON(http.StatusInternalServerError, ErrorResponse(err.Error()))
+		c.JSON(http.StatusOK, SuccessResponse([]interface{}{}))
 		return
 	}
 
@@ -483,7 +490,6 @@ func (s *Server) handleGetClients(c *gin.Context) {
 			desc = *cl.Description
 		}
 
-		// Get last used from tokens
 		var lastUsed *time.Time
 		_ = s.database.Get(&lastUsed, "SELECT MAX(last_used_at) FROM client_tokens WHERE client_id = ?", cl.ClientID)
 

internal/server/server.go

@@ -74,7 +74,8 @@ func NewServer(cfg *config.Config, database *db.DB) *Server {
 }
 
 func (s *Server) setupRoutes() {
-	s.router.Use(middleware.AuthMiddleware(s.database))
+	// Global middleware should only be for logging/recovery
+	// Auth is specific to groups
 
 	// Static files
 	s.router.StaticFile("/", "./static/index.html")
@@ -86,7 +87,9 @@ func (s *Server) setupRoutes() {
 	// WebSocket
 	s.router.GET("/ws", s.handleWebSocket)
 
+	// API V1 (External LLM Access)
 	v1 := s.router.Group("/v1")
+	v1.Use(middleware.AuthMiddleware(s.database))
 	{
 		v1.POST("/chat/completions", s.handleChatCompletions)
 		v1.GET("/models", s.handleListModels)