Finalized and updated team implementation, updated team dao, tests, and ex-/import

lib/data/db/database.g.dart

@@ -2122,7 +2122,7 @@ class $PlayerMatchTableTable extends PlayerMatchTable
     type: DriftSqlType.string,
     requiredDuringInsert: false,
     defaultConstraints: GeneratedColumn.constraintIsAlways(
-      'REFERENCES team_table (id)',
+      'REFERENCES team_table (id) ON DELETE SET NULL',
     ),
   );
   @override
@@ -2820,6 +2820,13 @@ abstract class _$AppDatabase extends GeneratedDatabase {
       ),
       result: [TableUpdate('player_match_table', kind: UpdateKind.delete)],
     ),
+    WritePropagation(
+      on: TableUpdateQuery.onTableName(
+        'team_table',
+        limitUpdateKind: UpdateKind.delete,
+      ),
+      result: [TableUpdate('player_match_table', kind: UpdateKind.update)],
+    ),
     WritePropagation(
       on: TableUpdateQuery.onTableName(
         'player_table',

lib/data/db/tables/player_match_table.dart

@@ -8,7 +8,9 @@ class PlayerMatchTable extends Table {
       text().references(PlayerTable, #id, onDelete: KeyAction.cascade)();
   TextColumn get matchId =>
       text().references(MatchTable, #id, onDelete: KeyAction.cascade)();
-  TextColumn get teamId => text().references(TeamTable, #id).nullable()();
+  TextColumn get teamId => text()
+      .references(TeamTable, #id, onDelete: KeyAction.setNull)
+      .nullable()();
 
   @override
   Set<Column<Object>> get primaryKey => {playerId, matchId};