create db completion service and mock data

src/app/services/db-completion.service.ts

@@ -0,0 +1,43 @@
+import { Injectable } from '@angular/core';
+import { HttpClient, HttpParams } from '@angular/common/http';
+import { environment } from 'src/environments/environment';
+import { apiURL, apiRetry } from '../api-utils';
+import { Completion } from '../completion';
+import { retry, map } from 'rxjs/operators';
+import { Observable } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class DbCompletionService {
+  private dbStatusUrl = environment.production ? apiURL + 'rest/db/completion' : 'api/dbCompletion';
+
+  constructor(private http: HttpClient) { }
+
+  getDeviceCompletion(id: string): Observable<Completion> {
+    let httpOptions: { params: HttpParams };
+    if (id) {
+      httpOptions = {
+        params: new HttpParams().set('device', id)
+      };
+    } else { }
+
+    return this.http
+      .get<Completion>(this.dbStatusUrl, httpOptions)
+      .pipe(
+        retry(apiRetry),
+        map(res => {
+          // Remove from array in developement
+          // in-memory-web-api returns arrays
+          if (!environment.production) {
+            const a: any = res as any;
+            if (a.length > 0) {
+              res = res[0];
+            }
+          }
+          return res;
+        })
+      );
+
+  }
+}