begin cleanup add_cam_main. dont remember if anything more

lib/interfaces/i_db.dart

@@ -0,0 +1,32 @@
+import 'package:sqflite/sqflite.dart';
+
+abstract interface class IDb {
+  Future<Database> get dB;
+
+  initDatabases();
+
+  onCreateDatabases(Database excursionDB, int version);
+
+  Future<int> addMainEntry(Map<String, dynamic> excursion);
+
+  Future<void> updateMainEntry(Map<String, dynamic> excursion);
+
+  Future<void> updateSent(int id);
+
+  Future<void> addTemplate(Map<String, dynamic> templates);
+
+  Future<void> updateTemplate(Map<String, dynamic> template);
+
+  Future<List<Map<String, dynamic>>> getAllMainEntries();
+
+  Future<List<Map<String, dynamic>>> getAllTemplates();
+
+  Future<void> deleteAllMainEntries();
+
+  Future<void> deleteAllTemplates();
+
+  Future<void> deleteTemplateById(String id);
+
+  Future<void> deleteMainEntryById(String id);
+
+}