update onDelete behavior for groupId in match_table to set null

lib/data/db/database.g.dart

@@ -1123,7 +1123,7 @@ class $MatchTableTable extends MatchTable
     type: DriftSqlType.string,
     requiredDuringInsert: false,
     defaultConstraints: GeneratedColumn.constraintIsAlways(
-      'REFERENCES group_table (id) ON DELETE CASCADE',
+      'REFERENCES group_table (id) ON DELETE SET NULL',
     ),
   );
   static const VerificationMeta _nameMeta = const VerificationMeta('name');
@@ -2780,7 +2780,7 @@ abstract class _$AppDatabase extends GeneratedDatabase {
         'group_table',
         limitUpdateKind: UpdateKind.delete,
       ),
-      result: [TableUpdate('match_table', kind: UpdateKind.delete)],
+      result: [TableUpdate('match_table', kind: UpdateKind.update)],
     ),
     WritePropagation(
       on: TableUpdateQuery.onTableName(

lib/data/db/tables/match_table.dart

@@ -7,8 +7,10 @@ class MatchTable extends Table {
   TextColumn get gameId =>
       text().references(GameTable, #id, onDelete: KeyAction.cascade)();
   // Nullable if there is no group associated with the match
-  TextColumn get groupId =>
-      text().references(GroupTable, #id, onDelete: KeyAction.cascade).nullable()();
+  // onDelete: If a group gets deleted, groupId in the match gets set to null
+  TextColumn get groupId => text()
+      .references(GroupTable, #id, onDelete: KeyAction.setNull)
+      .nullable()();
   TextColumn get name => text().nullable()();
   TextColumn get notes => text().nullable()();
   DateTimeColumn get createdAt => dateTime()();
@@ -16,4 +18,4 @@ class MatchTable extends Table {
 
   @override
   Set<Column<Object>> get primaryKey => {id};
-}
+}