diff --git a/pylib/anki/schedv2.py b/pylib/anki/schedv2.py
index b91aed151..dbec53d3d 100644
--- a/pylib/anki/schedv2.py
+++ b/pylib/anki/schedv2.py
@@ -1064,42 +1064,21 @@ select id from cards where did in %s and queue = {QUEUE_TYPE_REV} and due <= ? l
     # Filtered deck handling
     ##########################################################################
 
-    _restoreQueueWhenEmptyingSnippet = f"""
-queue = (case when queue < 0 then queue
-              when type in (1,{CARD_TYPE_RELEARNING}) then
-  (case when (case when odue then odue else due end) > 1000000000 then 1 else
-  {QUEUE_TYPE_DAY_LEARN_RELEARN} end)
-else
-  type
-end)
-"""
+    def rebuild_filtered_deck(self, deck_id: int) -> int:
+        return self.col.backend.rebuild_filtered_deck(deck_id)
+
+    def empty_filtered_deck(self, deck_id: int) -> None:
+        self.col.backend.empty_filtered_deck(deck_id)
 
     def rebuildDyn(self, did: Optional[int] = None) -> Optional[int]:
-        "Rebuild a filtered deck."
         did = did or self.col.decks.selected()
-        count = self.col.backend.rebuild_filtered_deck(did) or None
+        count = self.rebuild_filtered_deck(did) or None
         if not count:
             return None
         # and change to our new deck
         self.col.decks.select(did)
         return count
 
-    def emptyDyn(self, did: Optional[int], lim: Optional[str] = None) -> None:
-        if lim is None:
-            self.col.backend.empty_filtered_deck(did)
-            return
-
-        self.col.db.execute(
-            """
-update cards set did = odid, %s,
-due = (case when odue>0 then odue else due end), odue = 0, odid = 0, usn = ? where %s"""
-            % (self._restoreQueueWhenEmptyingSnippet, lim),
-            self.col.usn(),
-        )
-
-    def remFromDyn(self, cids: List[int]) -> None:
-        self.emptyDyn(None, "id in %s and odid" % ids2str(cids))
-
     def _removeFromFiltered(self, card: Card) -> None:
         if card.odid:
             card.did = card.odid
@@ -1121,6 +1100,33 @@ due = (case when odue>0 then odue else due end), odue = 0, odid = 0, usn = ? whe
         else:
             card.queue = card.type
 
+    # legacy
+
+    def emptyDyn(self, did: Optional[int], lim: Optional[str] = None) -> None:
+        if lim is None:
+            self.empty_filtered_deck(did)
+            return
+
+        queue = f"""
+queue = (case when queue < 0 then queue
+              when type in (1,{CARD_TYPE_RELEARNING}) then
+  (case when (case when odue then odue else due end) > 1000000000 then 1 else
+  {QUEUE_TYPE_DAY_LEARN_RELEARN} end)
+else
+  type
+end)
+"""
+        self.col.db.execute(
+            """
+update cards set did = odid, %s,
+due = (case when odue>0 then odue else due end), odue = 0, odid = 0, usn = ? where %s"""
+            % (queue, lim),
+            self.col.usn(),
+        )
+
+    def remFromDyn(self, cids: List[int]) -> None:
+        self.emptyDyn(None, "id in %s and odid" % ids2str(cids))
+
     # Leeches
     ##########################################################################
 
diff --git a/pylib/tests/test_schedv1.py b/pylib/tests/test_schedv1.py
index 025ec55de..407eddd12 100644
--- a/pylib/tests/test_schedv1.py
+++ b/pylib/tests/test_schedv1.py
@@ -682,7 +682,7 @@ def test_cram_rem():
     assert c.type == CARD_TYPE_LRN and c.queue == QUEUE_TYPE_LRN
     assert c.due != oldDue
     # if we terminate cramming prematurely it should be set back to new
-    col.sched.emptyDyn(did)
+    col.sched.empty_filtered_deck(did)
     c.load()
     assert c.type == CARD_TYPE_NEW and c.queue == QUEUE_TYPE_NEW
     assert c.due == oldDue
@@ -734,7 +734,7 @@ def test_cram_resched():
     col.reset()
     c = col.sched.getCard()
     col.sched.answerCard(c, 1)
-    col.sched.emptyDyn(did)
+    col.sched.empty_filtered_deck(did)
     c.load()
     assert c.ivl == 100
     assert c.due == col.sched.today + 25
@@ -746,7 +746,7 @@ def test_cram_resched():
     c = col.sched.getCard()
     col.sched.answerCard(c, 1)
     col.sched.answerCard(c, 3)
-    col.sched.emptyDyn(did)
+    col.sched.empty_filtered_deck(did)
     c.load()
     assert c.ivl == 100
     assert c.due == col.sched.today + 25
@@ -758,7 +758,7 @@ def test_cram_resched():
     col.reset()
     c = col.sched.getCard()
     col.sched.answerCard(c, 3)
-    col.sched.emptyDyn(did)
+    col.sched.empty_filtered_deck(did)
     c.load()
     assert c.ivl == 100
     assert c.due == -25
@@ -770,7 +770,7 @@ def test_cram_resched():
     col.reset()
     c = col.sched.getCard()
     col.sched.answerCard(c, 1)
-    col.sched.emptyDyn(did)
+    col.sched.empty_filtered_deck(did)
     c.load()
     assert c.ivl == 100
     assert c.due == -25
diff --git a/pylib/tests/test_schedv2.py b/pylib/tests/test_schedv2.py
index 6e928ae7b..fdd906d88 100644
--- a/pylib/tests/test_schedv2.py
+++ b/pylib/tests/test_schedv2.py
@@ -773,7 +773,7 @@ def test_filt_keep_lrn_state():
     assert c.due - intTime() > 60 * 60
 
     # emptying the deck preserves learning state
-    col.sched.emptyDyn(did)
+    col.sched.empty_filtered_deck(did)
     c.load()
     assert c.type == CARD_TYPE_LRN and c.queue == QUEUE_TYPE_LRN
     assert c.left == 1001
@@ -823,7 +823,7 @@ def test_preview():
     assert c.id == orig.id
 
     # emptying the filtered deck should restore card
-    col.sched.emptyDyn(did)
+    col.sched.empty_filtered_deck(did)
     c.load()
     assert c.queue == QUEUE_TYPE_NEW
     assert c.reps == 0
@@ -1255,7 +1255,7 @@ def test_negativeDueFilter():
     # into and out of filtered deck
     did = col.decks.newDyn("Cram")
     col.sched.rebuildDyn(did)
-    col.sched.emptyDyn(did)
+    col.sched.empty_filtered_deck(did)
     col.reset()
 
     c.load()
diff --git a/qt/aqt/customstudy.py b/qt/aqt/customstudy.py
index 1b5debc8e..6a36479d7 100644
--- a/qt/aqt/customstudy.py
+++ b/qt/aqt/customstudy.py
@@ -145,7 +145,7 @@ class CustomStudy(QDialog):
                 return QDialog.accept(self)
             else:
                 # safe to empty
-                self.mw.col.sched.emptyDyn(cur["id"])
+                self.mw.col.sched.empty_filtered_deck(cur["id"])
                 # reuse; don't delete as it may have children
                 dyn = cur
                 self.mw.col.decks.select(cur["id"])
diff --git a/qt/aqt/overview.py b/qt/aqt/overview.py
index 58f49c005..430eefd2b 100644
--- a/qt/aqt/overview.py
+++ b/qt/aqt/overview.py
@@ -79,7 +79,7 @@ class Overview:
             self.mw.col.sched.rebuildDyn()
             self.mw.reset()
         elif url == "empty":
-            self.mw.col.sched.emptyDyn(self.mw.col.decks.selected())
+            self.mw.col.sched.empty_filtered_deck(self.mw.col.decks.selected())
             self.mw.reset()
         elif url == "decks":
             self.mw.moveToState("deckBrowser")
@@ -112,7 +112,7 @@ class Overview:
 
     def onEmptyKey(self):
         if self._filteredDeck():
-            self.mw.col.sched.emptyDyn(self.mw.col.decks.selected())
+            self.mw.col.sched.empty_filtered_deck(self.mw.col.decks.selected())
             self.mw.reset()
 
     def onCustomStudyKey(self):