feat: add basic workings

internal/server/watchdog/watchdog.go

@@ -28,22 +28,40 @@ func Kickoff(env bootstrap.Environment, db *gorm.DB) {
 
 		run(env, db)
 
+		running := false
 		for range ticker.C {
-			run(env, db)
+			if running {
+				slog.Warn("watchdog is still running, skipping tick")
+				continue
+			}
+
+			running = true
+
+			func() {
+				defer func() { running = false }()
+				run(env, db)
+			}()
 		}
 	}()
 }
 
+// the watchdog has 2 tasks
+// 1 revoke expires keys
+// 2 remove / sync orphaned files/db records
 func run(env bootstrap.Environment, db *gorm.DB) {
 	slog.Debug("watchdog cycle start")
 
+	revokeExpired(db)
+
 	fsState, err := scanFS(env)
 	if err != nil {
+		slog.Error("scanFS failed", "error", err)
 		return
 	}
 
 	dbState, err := scanDB(db)
 	if err != nil {
+		slog.Error("scanDB failed", "error", err)
 		return
 	}