diff --git a/internal/server/clients.go b/internal/server/clients.go
index 062fbc5d..d6c272b6 100644
--- a/internal/server/clients.go
+++ b/internal/server/clients.go
@@ -1,7 +1,6 @@
 package server
 
 import (
-	"database/sql"
 	"net/http"
 	"time"
 
@@ -47,13 +46,14 @@ func (s *Server) handleGetClients(c *gin.Context) {
 			desc = *cl.Description
 		}
 
-		var lastUsedTime sql.NullTime
-		_ = s.database.Get(&lastUsedTime, "SELECT MAX(last_used_at) FROM client_tokens WHERE client_id = ?", cl.ClientID)
+		var lastUsedStr string
+		_ = s.database.Get(&lastUsedStr, "SELECT MAX(last_used_at) FROM client_tokens WHERE client_id = ?", cl.ClientID)
 
 		var lastUsed *time.Time
-		if lastUsedTime.Valid && !lastUsedTime.Time.IsZero() {
-			t := lastUsedTime.Time
-			lastUsed = &t
+		if lastUsedStr != "" {
+			if t, err := time.Parse("2006-01-02 15:04:05", lastUsedStr); err == nil {
+				lastUsed = &t
+			}
 		}
 
 		uiClients[i] = UIClient{
diff --git a/internal/server/providers_admin.go b/internal/server/providers_admin.go
index a4534322..58ebaad4 100644
--- a/internal/server/providers_admin.go
+++ b/internal/server/providers_admin.go
@@ -1,7 +1,6 @@
 package server
 
 import (
-	"database/sql"
 	"fmt"
 	"net/http"
 	"strings"
@@ -87,11 +86,13 @@ func (s *Server) handleGetProviders(c *gin.Context) {
 		}
 
 		// Get last used for this provider
-		var lastUsedTime sql.NullTime
-		_ = s.database.Get(&lastUsedTime, "SELECT MAX(timestamp) FROM llm_requests WHERE provider = ?", id)
+		var lastUsedStr string
+		_ = s.database.Get(&lastUsedStr, "SELECT MAX(timestamp) FROM llm_requests WHERE provider = ?", id)
 		var lastUsed interface{}
-		if lastUsedTime.Valid && !lastUsedTime.Time.IsZero() {
-			lastUsed = lastUsedTime.Time
+		if lastUsedStr != "" {
+			if t, err := time.Parse("2006-01-02 15:04:05", lastUsedStr); err == nil {
+				lastUsed = t
+			}
 		}
 
 		// Get models for this provider from registry