made changes in tankscontroller

src/controllers/tanksController.js

@@ -187,7 +187,7 @@ exports.updateTanklevels = async (req, reply) => {
         
 
        // waterLevel = newWaterLevel;
-      }, 2000);
+      }, 5000);
 
       intervals[tankId] = intervalId;
     }

src/models/tanks.js

@@ -42,7 +42,7 @@ const tanksSchema = new mongoose.Schema({
     waterlevel: { type: String, default: "0" },
     tankLocation: { type: String, default: null },
     motor_status: { type: String, default: "0" },
-    waterlevel_at_midnight:{ type: String },
+    waterlevel_at_midnight:{ type: String,default:"0" },
     connections: {
       source: { type: String },
       inputConnections: [