dont save duplicate device metrics received in the last 15 seconds

src/mqtt.js

@@ -223,6 +223,23 @@ client.on("message", async (topic, message) => {
 
                 // create device metric
                 try {
+
+                    // find an existing metric with duplicate information created in the last 15 seconds
+                    const existingDuplicateDeviceMetric = await prisma.deviceMetric.findFirst({
+                        where: {
+                            node_id: envelope.packet.from,
+                            battery_level: data.battery_level,
+                            voltage: data.voltage,
+                            channel_utilization: data.channel_utilization,
+                            air_util_tx: data.air_util_tx,
+                            created_at: {
+                                gte: new Date(Date.now() - 15000), // created in the last 15 seconds
+                            },
+                        }
+                    })
+
+                    // create metric if no duplicates found
+                    if(!existingDuplicateDeviceMetric){
                         await prisma.deviceMetric.create({
                             data: {
                                 node_id: envelope.packet.from,
@@ -232,6 +249,8 @@ client.on("message", async (topic, message) => {
                                 air_util_tx: data.air_util_tx,
                             },
                         });
+                    }
+
                 } catch (e) {
                     console.error(e);
                 }