Feature: Adding recipe templates to print recipes.

Feautre: Recipe export to xlsx
Chore: Python 11 style type annotations
Chore: Moved to sqlalchemy 2.0
Chore: Minimum python is 3.11
Fix: Fix nullability of a lot of fields in the database.

overlord/src/app/purchase-entries/purchase-entries-datasource.ts

@@ -20,11 +20,7 @@ export class PurchaseEntriesDataSource extends DataSource<PurchaseEntriesItem> {
   }
 
   connect(): Observable<PurchaseEntriesItem[]> {
-    const dataMutations: (
-      | Observable<PurchaseEntriesItem[]>
-      | EventEmitter<PageEvent>
-      | EventEmitter<Sort>
-    )[] = [observableOf(this.data)];
+    const dataMutations: (EventEmitter<PageEvent> | EventEmitter<Sort>)[] = [];
     if (this.paginator) {
       dataMutations.push((this.paginator as MatPaginator).page);
     }
@@ -37,7 +33,7 @@ export class PurchaseEntriesDataSource extends DataSource<PurchaseEntriesItem> {
       this.paginator.length = this.data.length;
     }
 
-    return merge(...dataMutations).pipe(
+    return merge(observableOf(this.data), ...dataMutations).pipe(
       map(() => this.getPagedData(this.getSortedData([...this.data]))),
     );
   }