diff --git a/crates/ascend/src/server/migrations.rs b/crates/ascend/src/server/migrations.rs
index 7e92a16..fff90da 100644
--- a/crates/ascend/src/server/migrations.rs
+++ b/crates/ascend/src/server/migrations.rs
@@ -13,6 +13,43 @@ pub async fn run_migrations(db: &Database) -> Result<(), Box<dyn std::error::Err
     if is_at_version(db, 3).await? {
         migrate_to_v4(db).await?;
     }
+    if is_at_version(db, 4).await? {
+        canonicalize_all_problems(db).await?;
+    }
+
+    Ok(())
+}
+
+pub async fn canonicalize_all_problems(db: &Database) -> Result<(), Box<dyn std::error::Error>> {
+    tracing::warn!("CANONICALIZING ALL PROBLEMS");
+
+    db.write(|txn| {
+        let mut walls_table = txn.open_table(db::v4::TABLE_WALLS)?;
+
+        let walls_dump = walls_table
+            .iter()?
+            .map(|el| {
+                let (k, v) = el.unwrap();
+                (k.value(), v.value())
+            })
+            .collect::<BTreeMap<_, _>>();
+
+        for (wall_uid, mut wall) in walls_dump.into_iter() {
+            wall.problems = wall
+                .problems
+                .into_iter()
+                .map(|mut problem| {
+                    problem.pattern = problem.pattern.canonicalize();
+                    problem
+                })
+                .collect();
+
+            walls_table.insert(wall_uid, wall)?;
+        }
+
+        Ok(())
+    })
+    .await?;
 
     Ok(())
 }