diff --git a/codebase2/codebase-sqlite/U/Codebase/Sqlite/TempEntity.hs b/codebase2/codebase-sqlite/U/Codebase/Sqlite/TempEntity.hs
index f1336d234..aff0e5df8 100644
--- a/codebase2/codebase-sqlite/U/Codebase/Sqlite/TempEntity.hs
+++ b/codebase2/codebase-sqlite/U/Codebase/Sqlite/TempEntity.hs
@@ -3,9 +3,10 @@ module U.Codebase.Sqlite.TempEntity where
 import qualified U.Codebase.Sqlite.Branch.Format as Namespace
 import qualified U.Codebase.Sqlite.Causal as Causal
 import qualified U.Codebase.Sqlite.Decl.Format as Decl
+import qualified U.Codebase.Sqlite.Entity as Entity
+import U.Codebase.Sqlite.LocalIds (LocalIds')
 import qualified U.Codebase.Sqlite.Patch.Format as Patch
 import qualified U.Codebase.Sqlite.Term.Format as Term
-import qualified U.Codebase.Sqlite.Entity as Entity
 import U.Util.Base32Hex (Base32Hex)
 import Unison.Prelude
 
@@ -19,6 +20,8 @@ import Unison.Prelude
 type TempEntity =
   Entity.SyncEntity' Text Base32Hex Base32Hex Base32Hex Base32Hex Base32Hex Base32Hex
 
+type TempLocalIds = LocalIds' Text Base32Hex
+
 type TempTermFormat = Term.SyncTermFormat' Text Base32Hex
 
 type TempDeclFormat = Decl.SyncDeclFormat' Text Base32Hex
diff --git a/unison-cli/src/Unison/Share/Sync.hs b/unison-cli/src/Unison/Share/Sync.hs
index 5bf1ad465..bce929dbd 100644
--- a/unison-cli/src/Unison/Share/Sync.hs
+++ b/unison-cli/src/Unison/Share/Sync.hs
@@ -32,6 +32,7 @@ import U.Codebase.Sqlite.LocalIds (LocalIds' (..))
 import qualified U.Codebase.Sqlite.Patch.Format as PatchFormat
 import qualified U.Codebase.Sqlite.Queries as Q
 import U.Codebase.Sqlite.TempEntity (TempEntity)
+import qualified U.Codebase.Sqlite.TempEntity as TempEntity
 import qualified U.Codebase.Sqlite.Term.Format as TermFormat
 import U.Util.Base32Hex (Base32Hex)
 import qualified U.Util.Hash as Hash
@@ -388,15 +389,9 @@ entityToTempEntity = \case
       & DeclFormat.SyncDecl
       & Entity.DC
   Share.P Share.Patch {textLookup, oldHashLookup, newHashLookup, bytes} ->
-    Entity.P
-      ( PatchFormat.SyncFull
-          PatchFormat.LocalIds
-            { patchTextLookup = Vector.fromList textLookup,
-              patchHashLookup = Vector.fromList (coerce @[Share.Hash] @[Base32Hex] oldHashLookup),
-              patchDefnLookup = Vector.fromList (map jwt32 newHashLookup)
-            }
-          bytes
-      )
+    Entity.P (PatchFormat.SyncFull (mungePatchLocalIds textLookup oldHashLookup newHashLookup) bytes)
+  Share.PD Share.PatchDiff {parent, textLookup, oldHashLookup, newHashLookup, bytes} ->
+    Entity.P (PatchFormat.SyncDiff (jwt32 parent) (mungePatchLocalIds textLookup oldHashLookup newHashLookup) bytes)
   Share.N Share.Namespace {textLookup, defnLookup, patchLookup, childLookup, bytes} ->
     Entity.N
       ( NamespaceFormat.SyncFull
@@ -415,13 +410,21 @@ entityToTempEntity = \case
           parents = Vector.fromList (map jwt32 (Set.toList parents))
         }
   where
-    mungeLocalIds :: Share.LocalIds Text Share.HashJWT -> LocalIds' Text Base32Hex
+    mungeLocalIds :: Share.LocalIds Text Share.HashJWT -> TempEntity.TempLocalIds
     mungeLocalIds Share.LocalIds {texts, hashes} =
       LocalIds
         { textLookup = Vector.fromList texts,
           defnLookup = Vector.map jwt32 (Vector.fromList hashes)
         }
 
+    mungePatchLocalIds :: [Text] -> [Share.Hash] -> [Share.HashJWT] -> TempEntity.TempPatchLocalIds
+    mungePatchLocalIds textLookup oldHashLookup newHashLookup =
+      PatchFormat.LocalIds
+        { patchTextLookup = Vector.fromList textLookup,
+          patchHashLookup = Vector.fromList (coerce @[Share.Hash] @[Base32Hex] oldHashLookup),
+          patchDefnLookup = Vector.fromList (map jwt32 newHashLookup)
+        }
+
     jwt32 :: Share.HashJWT -> Base32Hex
     jwt32 =
       Share.toBase32Hex . Share.hashJWTHash
diff --git a/unison-share-api/src/Unison/Sync/Types.hs b/unison-share-api/src/Unison/Sync/Types.hs
index f2d7194ca..c471cdaf9 100644
--- a/unison-share-api/src/Unison/Sync/Types.hs
+++ b/unison-share-api/src/Unison/Sync/Types.hs
@@ -319,6 +319,7 @@ data Entity text noSyncHash hash
   = TC (TermComponent text hash)
   | DC (DeclComponent text hash)
   | P (Patch text noSyncHash hash)
+  | PD (PatchDiff text noSyncHash hash)
   | N (Namespace text hash)
   | C (Causal hash)
   deriving stock (Show, Eq, Ord)
@@ -340,6 +341,11 @@ instance (ToJSON text, ToJSON noSyncHash, ToJSON hash) => ToJSON (Entity text no
         [ "type" .= PatchType,
           "object" .= patch
         ]
+    PD patch ->
+      object
+        [ "type" .= PatchDiffType,
+          "object" .= patch
+        ]
     N ns ->
       object
         [ "type" .= NamespaceType,
@@ -358,6 +364,7 @@ instance (FromJSON text, FromJSON noSyncHash, FromJSON hash, Ord hash) => FromJS
       TermComponentType -> TC <$> obj .: "object"
       DeclComponentType -> DC <$> obj .: "object"
       PatchType -> P <$> obj .: "object"
+      PatchDiffType -> PD <$> obj .: "object"
       NamespaceType -> N <$> obj .: "object"
       CausalType -> C <$> obj .: "object"
 
@@ -369,6 +376,7 @@ entityDependencies = \case
   TC (TermComponent terms) -> flip foldMap terms \(LocalIds {hashes}, _term) -> Set.fromList hashes
   DC (DeclComponent decls) -> flip foldMap decls \(LocalIds {hashes}, _decl) -> Set.fromList hashes
   P Patch {newHashLookup} -> Set.fromList newHashLookup
+  PD PatchDiff {parent, newHashLookup} -> Set.insert parent (Set.fromList newHashLookup)
   N Namespace {defnLookup, patchLookup, childLookup} ->
     Set.fromList defnLookup <> Set.fromList patchLookup
       <> foldMap (\(namespaceHash, causalHash) -> Set.fromList [namespaceHash, causalHash]) childLookup
@@ -505,6 +513,34 @@ instance (FromJSON text, FromJSON oldHash, FromJSON newHash) => FromJSON (Patch
     Base64Bytes bytes <- obj .: "bytes"
     pure Patch {..}
 
+data PatchDiff text oldHash hash = PatchDiff
+  { parent :: hash,
+    textLookup :: [text],
+    oldHashLookup :: [oldHash],
+    newHashLookup :: [hash],
+    bytes :: ByteString
+  }
+  deriving stock (Eq, Ord, Show)
+
+instance (ToJSON text, ToJSON oldHash, ToJSON hash) => ToJSON (PatchDiff text oldHash hash) where
+  toJSON (PatchDiff parent textLookup oldHashLookup newHashLookup bytes) =
+    object
+      [ "parent" .= parent,
+        "text_lookup" .= textLookup,
+        "optional_hash_lookup" .= oldHashLookup,
+        "hash_lookup" .= newHashLookup,
+        "bytes" .= Base64Bytes bytes
+      ]
+
+instance (FromJSON text, FromJSON oldHash, FromJSON hash) => FromJSON (PatchDiff text oldHash hash) where
+  parseJSON = Aeson.withObject "PatchDiff" \obj -> do
+    parent <- obj .: "parent"
+    textLookup <- obj .: "text_lookup"
+    oldHashLookup <- obj .: "optional_hash_lookup"
+    newHashLookup <- obj .: "hash_lookup"
+    Base64Bytes bytes <- obj .: "bytes"
+    pure PatchDiff {..}
+
 data Namespace text hash = Namespace
   { textLookup :: [text],
     defnLookup :: [hash],
@@ -573,6 +609,7 @@ data EntityType
   = TermComponentType
   | DeclComponentType
   | PatchType
+  | PatchDiffType
   | NamespaceType
   | CausalType
   deriving stock (Eq, Ord, Show)
@@ -582,6 +619,7 @@ instance ToJSON EntityType where
     TermComponentType -> "term_component"
     DeclComponentType -> "decl_component"
     PatchType -> "patch"
+    PatchDiffType -> "patch_diff"
     NamespaceType -> "namespace"
     CausalType -> "causal"
 
@@ -590,6 +628,7 @@ instance FromJSON EntityType where
     "term_component" -> pure TermComponentType
     "decl_component" -> pure DeclComponentType
     "patch" -> pure PatchType
+    "patch_diff" -> pure PatchDiffType
     "namespace" -> pure NamespaceType
     "causal" -> pure CausalType
     t -> failText $ "Unexpected entity type: " <> t