Support retrievability calculation for (re)learning cards

rslib/src/browser_table.rs

@@ -121,12 +121,16 @@ impl Card {
     }
 
     pub(crate) fn days_since_last_review(&self, timing: &SchedTimingToday) -> Option<u32> {
-        self.due_time(timing).map(|due| {
+        if !self.is_due_in_days() {
-            due.adding_secs(-86_400 * self.interval as i64)
+            Some(0)
-                .elapsed_secs()
+        } else {
-                .max(0) as u32
+            self.due_time(timing).map(|due| {
-                / 86_400
+                due.adding_secs(-86_400 * self.interval as i64)
-        })
+                    .elapsed_secs()
+                    .max(0) as u32
+                    / 86_400
+            })
+        }
     }
 }
 

rslib/src/storage/sqlite.rs

@@ -285,18 +285,19 @@ fn add_extract_fsrs_retrievability(db: &Connection) -> rusqlite::Result<()> {
             let Ok(due) = ctx.get_raw(1).as_i64() else {
                 return Ok(None);
             };
-            if due > 365_000 {
+            let days_elapsed = if due > 365_000 {
-                // learning card
+                // (re)learning card, assume 0 days have elapsed
-                return Ok(None);
+                0
-            }
+            } else {
-            let Ok(ivl) = ctx.get_raw(2).as_i64() else {
+                let Ok(ivl) = ctx.get_raw(2).as_i64() else {
-                return Ok(None);
+                    return Ok(None);
+                };
+                let Ok(days_elapsed) = ctx.get_raw(3).as_i64() else {
+                    return Ok(None);
+                };
+                let review_day = (due.max(0) as u32).saturating_sub(ivl as u32);
+                (days_elapsed.max(0) as u32).saturating_sub(review_day)
             };
-            let Ok(days_elapsed) = ctx.get_raw(3).as_i64() else {
-                return Ok(None);
-            };
-            let review_day = (due.max(0) as u32).saturating_sub(ivl as u32);
-            let days_elapsed = (days_elapsed.max(0) as u32).saturating_sub(review_day);
             Ok(card_data.memory_state().map(|state| {
                 FSRS::new(None)
                     .unwrap()