diff --git a/internal/store/postgres/stats.go b/internal/store/postgres/stats.go
index 5e11d06..107ce23 100644
--- a/internal/store/postgres/stats.go
+++ b/internal/store/postgres/stats.go
@@ -12,11 +12,11 @@ type FrameworkStats struct {
 }
 
 type Summary struct {
-	ActiveSessions int                        `json:"active_sessions"`
-	RunsToday      int                        `json:"runs_today"`
-	ToolCallsToday int                        `json:"tool_calls_today"`
-	ErrorsToday    int                        `json:"errors_today"`
-	ByFramework    map[string]FrameworkStats  `json:"by_framework"`
+	ActiveSessions int                       `json:"active_sessions"`
+	RunsToday      int                       `json:"runs_today"`
+	ToolCallsToday int                       `json:"tool_calls_today"`
+	ErrorsToday    int                       `json:"errors_today"`
+	ByFramework    map[string]FrameworkStats `json:"by_framework"`
 }
 
 type TimeseriesBucket struct {
@@ -59,7 +59,7 @@ func (d *DB) GetSummary(ctx context.Context) (*Summary, error) {
 	// Per-framework aggregates for today
 	fwQ := `
 		SELECT
-			COALESCE(source_framework, ''),
+			COALESCE(source_framework, 'unknown'),
 			COUNT(*) FILTER (WHERE type = 'run.start')        AS runs,
 			COUNT(*) FILTER (WHERE type = 'span.end'
 			                   AND payload->'attributes'->>'span_kind' = 'tool') AS tools,