Write SqlDbLayer

src/data_provider/card_states.rs

@@ -23,7 +23,7 @@ pub fn load_stats_of_deck(
                 score: row.get(2)?,
                 fsrs_opened: NaiveDate::from_epoch_days(row.get::<usize, i32>(4)?)
                     .expect("Incorrect date encoding"),
-                fsrs_memory: Some(get_memory(row.get(5)?)),
+                fsrs_memory: get_memory(row.get(5)?),
                 last_open: row.get(3)?,
                 fsrs_open_day: NaiveDate::from_epoch_days(row.get::<usize, i32>(6)?)
                     .expect("Incorrect date encoding"),
@@ -37,14 +37,21 @@ pub fn load_stats_of_deck(
     Ok(buffer)
 }
 
-fn get_memory(value: i64) -> MemoryState {
-    MemoryState {
+fn get_memory(value: i64) -> Option<MemoryState> {
+    if value == 0 {
+        return None;
+    }
+    Some(MemoryState {
         stability: f32::from_bits(value as u32),
         difficulty: f32::from_bits((value >> 32) as u32),
-    }
+    })
 }
 
-fn memory_to_i64(value: &MemoryState) -> i64 {
+fn memory_to_i64(value: &Option<MemoryState>) -> i64 {
+    let Some(value) = &value else {
+        return 0;
+    };
+
     value.stability.to_bits() as i64 | ((value.difficulty.to_bits() as i64) << 32)
 }
 
@@ -69,10 +76,7 @@ pub fn add_stat_list(stats: &mut [CardStatistics], connection: &mut Connection)
                 stat.score,
                 stat.last_open.timestamp(),
                 stat.fsrs_opened.to_epoch_days(),
-                memory_to_i64(&stat.fsrs_memory.unwrap_or(MemoryState {
-                    difficulty: 0.0,
-                    stability: 0.0
-                })),
+                memory_to_i64(&stat.fsrs_memory),
                 stat.fsrs_open_day.to_epoch_days()
             ])
             .map_err(|_| DbSaveError)?;