Implement whole ass "backend"

lib/notes.dart

@@ -0,0 +1,64 @@
+import 'package:journaler/db.dart';
+
+class Note {
+  final String date;
+  String content;
+
+  Note({required this.date, required this.content});
+}
+
+class Todo {
+  final String date;
+  final String content;
+
+  Todo({required this.date, required this.content});
+}
+
+Future<Note?> getLatestNote() async {
+  final note = await DB.db.rawQuery(
+    'SELECT content, date FROM notes ORDER BY date DESC LIMIT 1',
+  );
+  if (note.isEmpty) {
+    return null;
+  }
+  return Note(
+    date: note[0]['date'] as String,
+    content: note[0]['content'] as String,
+  );
+}
+
+Future<void> createNote(String content) async {
+  if (content.isEmpty) {
+    return;
+  }
+  await DB.db.insert('notes', {'content': content});
+}
+
+Future<void> updateNote(Note note) async {
+  await DB.db.update(
+    'notes',
+    {'content': note.content},
+    where: 'date = ?',
+    whereArgs: [note.date],
+  );
+}
+
+Future<Todo?> getLatestTodo() async {
+  final todo = await DB.db.rawQuery(
+    'SELECT content, date FROM todos ORDER BY date DESC LIMIT 1',
+  );
+  if (todo.isEmpty) {
+    return null;
+  }
+  return Todo(
+    date: todo[0]['date'] as String,
+    content: todo[0]['content'] as String,
+  );
+}
+
+Future<void> createTodo(String content) async {
+  if (content.isEmpty) {
+    return;
+  }
+  await DB.db.insert('todos', {'content': content});
+}