First one-shot pass

src/store/schema.rs

@@ -0,0 +1,61 @@
+use serde::{Deserialize, Serialize};
+
+use crate::engine::key_stats::KeyStatsStore;
+use crate::session::result::LessonResult;
+
+const SCHEMA_VERSION: u32 = 1;
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct ProfileData {
+    pub schema_version: u32,
+    pub unlocked_letters: Vec<char>,
+    pub total_score: f64,
+    pub total_lessons: u32,
+    pub streak_days: u32,
+    pub best_streak: u32,
+    pub last_practice_date: Option<String>,
+}
+
+impl Default for ProfileData {
+    fn default() -> Self {
+        Self {
+            schema_version: SCHEMA_VERSION,
+            unlocked_letters: Vec::new(),
+            total_score: 0.0,
+            total_lessons: 0,
+            streak_days: 0,
+            best_streak: 0,
+            last_practice_date: None,
+        }
+    }
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct KeyStatsData {
+    pub schema_version: u32,
+    pub stats: KeyStatsStore,
+}
+
+impl Default for KeyStatsData {
+    fn default() -> Self {
+        Self {
+            schema_version: SCHEMA_VERSION,
+            stats: KeyStatsStore::default(),
+        }
+    }
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct LessonHistoryData {
+    pub schema_version: u32,
+    pub lessons: Vec<LessonResult>,
+}
+
+impl Default for LessonHistoryData {
+    fn default() -> Self {
+        Self {
+            schema_version: SCHEMA_VERSION,
+            lessons: Vec::new(),
+        }
+    }
+}