implement purging old environment metrics after configured duration

src/mqtt.js

@@ -83,6 +83,11 @@ const optionsList = [
         type: Number,
         description: "Device Metrics older than this many seconds will be purged from the database.",
     },
+    {
+        name: "purge-environment-metrics-after-seconds",
+        type: Number,
+        description: "Environment Metrics older than this many seconds will be purged from the database.",
+    },
     {
         name: "purge-nodes-unheard-for-seconds",
         type: Number,
@@ -131,6 +136,7 @@ const decryptionKeys = options["decryption-keys"] ?? [
 const purgeIntervalSeconds = options["purge-interval-seconds"] ?? 10;
 const purgeNodesUnheardForSeconds = options["purge-nodes-unheard-for-seconds"] ?? null;
 const purgeDeviceMetricsAfterSeconds = options["purge-device-metrics-after-seconds"] ?? null;
+const purgeEnvironmentMetricsAfterSeconds = options["purge-environment-metrics-after-seconds"] ?? null;
 const purgePositionsAfterSeconds = options["purge-positions-after-seconds"] ?? null;
 
 // create mqtt client
@@ -158,6 +164,7 @@ if(purgeIntervalSeconds){
     setInterval(async () => {
         await purgeUnheardNodes();
         await purgeOldDeviceMetrics();
+        await purgeOldEnvironmentMetrics();
         await purgeOldPositions();
     }, purgeIntervalSeconds * 1000);
 }
@@ -214,6 +221,32 @@ async function purgeOldDeviceMetrics() {
 
 }
 
+/**
+ * Purges all environment metrics from the database that are older than the configured timeframe.
+ */
+async function purgeOldEnvironmentMetrics() {
+
+    // make sure seconds provided
+    if(!purgeEnvironmentMetricsAfterSeconds){
+        return;
+    }
+
+    // delete all environment metrics that are older than the configured purge time
+    try {
+        await prisma.environmentMetric.deleteMany({
+            where: {
+                created_at: {
+                    // last updated before x seconds ago
+                    lt: new Date(Date.now() - purgeEnvironmentMetricsAfterSeconds * 1000),
+                },
+            }
+        });
+    } catch(e) {
+        // do nothing
+    }
+
+}
+
 /**
  * Purges all positions from the database that are older than the configured timeframe.
  */