Adding tentative db methods for removing and muting subscriptions

src/Subscription.ts

@@ -14,4 +14,7 @@ export class Subscription {
 
     @Column()
     keys_auth: string;
+
+    @Column()
+    muted: boolean = false;
 }

src/db.ts

@@ -58,12 +58,40 @@ class DBService {
   }
 
 
+  async removeSubscription(endpoint: string): Promise<Boolean> {
+    let result = true;
+    if (this.isReady) {
+      await this.dataSource.manager.delete(Subscription, { endpoint: endpoint });
+      
+    } else {
+      result = false;
+      
+    }
+    return result;
+  }
+
+
+  async toggleMuteSubscription(endpoint: string): Promise<Boolean> {
+    let result = true;
+    if (this.isReady) {
+      const subscription = await this.dataSource.manager.findOne(Subscription, { where : {endpoint: endpoint} });
+      subscription.muted = !subscription.muted;
+      await this.dataSource.manager.save(subscription)
+    } else {
+      result = false;
+      
+    }
+    return result;  
+  }
+
+
   async getVapidKeys(): Promise<VapidKeys[]> {
     console.log(__filename, "getVapidKeys", this.isReady);
     let result = [ new VapidKeys() ];
     if ( this.isReady ) {
       result = await this.dataSource.manager.find(VapidKeys);
       console.log(__filename, "results of find: ", result);
+      
     } else {
       console.log(__filename, "Database is not ready");