diff --git a/openflare_server/model/migrate/v16.go b/openflare_server/model/migrate/v16.go
index 8f26fddb..4567d80a 100644
--- a/openflare_server/model/migrate/v16.go
+++ b/openflare_server/model/migrate/v16.go
@@ -92,6 +92,12 @@ func migrateV16(ctx Context, db *gorm.DB, backend string) error {
 		if err := db.Model(&proxyRouteV16{}).Where("upstream_type = ?", "tunnel").Update("upstream_type", "direct").Error; err != nil {
 			return fmt.Errorf("reset pre-release tunnel proxy routes: %w", err)
 		}
+		// Drop the legacy index idx_proxy_routes_tunnel_id if it exists, to avoid errors on dropping the tunnel_id column (especially on SQLite).
+		if migrator.HasIndex(&proxyRouteV16{}, "idx_proxy_routes_tunnel_id") {
+			if err := migrator.DropIndex(&proxyRouteV16{}, "idx_proxy_routes_tunnel_id"); err != nil {
+				return fmt.Errorf("drop index idx_proxy_routes_tunnel_id failed: %w", err)
+			}
+		}
 		if err := migrator.DropColumn(&proxyRouteV16{}, "tunnel_id"); err != nil {
 			return fmt.Errorf("drop pre-release proxy_routes.tunnel_id: %w", err)
 		}
diff --git a/openflare_server/model/migrations.go b/openflare_server/model/migrations.go
index 7ba1d151..9ca2b015 100644
--- a/openflare_server/model/migrations.go
+++ b/openflare_server/model/migrations.go
@@ -204,6 +204,12 @@ func dropLegacyNodeColumns(db *gorm.DB, backend string) error {
 	if db == nil || !db.Migrator().HasTable(&Node{}) {
 		return nil
 	}
+	// Drop the legacy index idx_nodes_agent_token if it exists, to avoid errors on dropping the agent_token column (especially on SQLite).
+	if db.Migrator().HasIndex(&Node{}, "idx_nodes_agent_token") {
+		if err := db.Migrator().DropIndex(&Node{}, "idx_nodes_agent_token"); err != nil {
+			return fmt.Errorf("drop index idx_nodes_agent_token failed: %w", err)
+		}
+	}
 	legacyColumns := []struct {
 		column string
 	}{