Switch everything to Dexie.js

web/src/app/Pruner.js

@@ -0,0 +1,39 @@
+import db from "./db";
+import prefs from "./Prefs";
+
+const delayMillis = 15000; // 15 seconds
+const intervalMillis = 1800000; // 30 minutes
+
+class Pruner {
+    constructor() {
+        this.timer = null;
+    }
+
+    startWorker() {
+        if (this.timer !== null) {
+            return;
+        }
+        this.timer = setInterval(() => this.prune(), intervalMillis);
+        setTimeout(() => this.prune(), delayMillis);
+    }
+
+    async prune() {
+        const deleteAfterSeconds = await prefs.deleteAfter();
+        const pruneThresholdTimestamp = Math.round(Date.now()/1000) - deleteAfterSeconds;
+        if (deleteAfterSeconds === 0) {
+            console.log(`[Pruner] Pruning is disabled. Skipping.`);
+            return;
+        }
+        console.log(`[Pruner] Pruning notifications older than ${deleteAfterSeconds}s (timestamp ${pruneThresholdTimestamp})`);
+        try {
+            await db.notifications
+                .where("time").below(pruneThresholdTimestamp)
+                .delete();
+        } catch (e) {
+            console.log(`[Pruner] Error pruning old subscriptions`, e);
+        }
+    }
+}
+
+const pruner = new Pruner();
+export default pruner;