diff --git a/coderules/languages/jetbrains.mps.lang.coderules/runtime/models/jetbrains.mps.lang.coderules.program.mps b/coderules/languages/jetbrains.mps.lang.coderules/runtime/models/jetbrains.mps.lang.coderules.program.mps
index 033c8796..06b559c0 100644
--- a/coderules/languages/jetbrains.mps.lang.coderules/runtime/models/jetbrains.mps.lang.coderules.program.mps
+++ b/coderules/languages/jetbrains.mps.lang.coderules/runtime/models/jetbrains.mps.lang.coderules.program.mps
@@ -12544,12 +12544,6 @@
         <property role="TrG5h" value="unit" />
         <node concept="3Tqbb2" id="6nFpYlu7giI" role="1tU5fm" />
       </node>
-      <node concept="37vLTG" id="7NeFFOg3az8" role="3clF46">
-        <property role="TrG5h" value="relevantNodesTracker" />
-        <node concept="3uibUv" id="3DPJ8QImigO" role="1tU5fm">
-          <ref role="3uigEE" node="357z3MCcYVD" resolve="RelevantNodesMonitor" />
-        </node>
-      </node>
       <node concept="3cqZAl" id="6nFpYlu7fpO" role="3clF45" />
       <node concept="3Tm1VV" id="6nFpYlu7fpP" role="1B3o_S" />
       <node concept="3clFbS" id="6nFpYlu7fpQ" role="3clF47">
@@ -12600,8 +12594,13 @@
                 <ref role="2Oxat5" node="357z3MCpd1F" resolve="relevantNodesMonitor" />
               </node>
             </node>
-            <node concept="37vLTw" id="7NeFFOg3foA" role="37vLTx">
-              <ref role="3cqZAo" node="7NeFFOg3az8" resolve="relevantNodesTracker" />
+            <node concept="2ShNRf" id="3GLv42NdC3W" role="37vLTx">
+              <node concept="1pGfFk" id="3GLv42NdC$E" role="2ShVmc">
+                <ref role="37wK5l" node="3GLv42NdnWY" resolve="UpdatesRecorder.RelevantNodesMonitor" />
+                <node concept="37vLTw" id="3GLv42NdCGo" role="37wK5m">
+                  <ref role="3cqZAo" node="6nFpYlu7giH" resolve="unit" />
+                </node>
+              </node>
             </node>
           </node>
         </node>
@@ -12625,9 +12624,6 @@
         <node concept="3clFbF" id="6nFpYlu7kwf" role="3cqZAp">
           <node concept="1rXfSq" id="6nFpYlu7kwe" role="3clFbG">
             <ref role="37wK5l" node="3u5wJte1ac" resolve="stopTrackingChanges" />
-            <node concept="37vLTw" id="4mdCe2g_hf0" role="37wK5m">
-              <ref role="3cqZAo" node="4mdCe2gzxYJ" resolve="repository" />
-            </node>
           </node>
         </node>
       </node>
@@ -12643,9 +12639,6 @@
             <node concept="3clFbF" id="6nFpYlu7gv$" role="3cqZAp">
               <node concept="1rXfSq" id="6nFpYlu7gvz" role="3clFbG">
                 <ref role="37wK5l" node="3u5wJtdQ7a" resolve="startTrackingChanges" />
-                <node concept="37vLTw" id="4mdCe2g_gEq" role="37wK5m">
-                  <ref role="3cqZAo" node="4mdCe2gzxYJ" resolve="repository" />
-                </node>
                 <node concept="37vLTw" id="6YGKjaPwASZ" role="37wK5m">
                   <ref role="3cqZAo" node="6YGKjaPwvly" resolve="model" />
                 </node>
@@ -12686,7 +12679,7 @@
             <node concept="3clFbF" id="6PD9XvnQ$II" role="3cqZAp">
               <node concept="2OqwBi" id="6PD9XvnQ_q1" role="3clFbG">
                 <node concept="37vLTw" id="6PD9XvnQ$IH" role="2Oq$k0">
-                  <ref role="3cqZAo" node="6nFpYlu6O1H" resolve="nodeChangeTracker" />
+                  <ref role="3cqZAo" node="6nFpYlu6O1H" resolve="changesTracker" />
                 </node>
                 <node concept="liA8E" id="6PD9XvnQZU9" role="2OqNvi">
                   <ref role="37wK5l" node="6PD9XvnQE1T" resolve="activateOnReferredModels" />
@@ -12701,7 +12694,7 @@
             <node concept="2OqwBi" id="6PD9XvnQyjP" role="3uHU7B">
               <node concept="Xjq3P" id="6PD9XvnQy4D" role="2Oq$k0" />
               <node concept="2OwXpG" id="6PD9XvnQyWZ" role="2OqNvi">
-                <ref role="2Oxat5" node="6nFpYlu6O1H" resolve="nodeChangeTracker" />
+                <ref role="2Oxat5" node="6nFpYlu6O1H" resolve="changesTracker" />
               </node>
             </node>
             <node concept="10Nm6u" id="6PD9XvnQ$jr" role="3uHU7w" />
@@ -12902,7 +12895,7 @@
                   <ref role="3cqZAo" node="357z3MCpd1F" resolve="relevantNodesMonitor" />
                 </node>
                 <node concept="liA8E" id="357z3MCq6PQ" role="2OqNvi">
-                  <ref role="37wK5l" node="45q4rZQbgMm" resolve="update" />
+                  <ref role="37wK5l" node="3GLv42NdnXx" resolve="update" />
                   <node concept="37vLTw" id="357z3MCq73_" role="37wK5m">
                     <ref role="3cqZAo" node="6nFpYlud3F7" resolve="source" />
                   </node>
@@ -13542,7 +13535,7 @@
                                   <ref role="3cqZAo" node="357z3MCpd1F" resolve="relevantNodesMonitor" />
                                 </node>
                                 <node concept="liA8E" id="3DPJ8QIissO" role="2OqNvi">
-                                  <ref role="37wK5l" node="5$0KRV_gTCf" resolve="getRelevantOrigins" />
+                                  <ref role="37wK5l" node="3GLv42NdnXl" resolve="getRelevantOrigins" />
                                 </node>
                               </node>
                               <node concept="3$u5V9" id="51ek2rQMIZy" role="2OqNvi">
@@ -13833,12 +13826,6 @@
     <node concept="2tJIrI" id="6nFpYludzRN" role="jymVt" />
     <node concept="3clFb_" id="3u5wJtdQ7a" role="jymVt">
       <property role="TrG5h" value="startTrackingChanges" />
-      <node concept="37vLTG" id="4mdCe2g_9K1" role="3clF46">
-        <property role="TrG5h" value="repo" />
-        <node concept="3uibUv" id="4mdCe2g_ekT" role="1tU5fm">
-          <ref role="3uigEE" to="lui2:~SRepository" resolve="SRepository" />
-        </node>
-      </node>
       <node concept="37vLTG" id="3u5wJtdRvH" role="3clF46">
         <property role="TrG5h" value="model" />
         <node concept="H_c77" id="3u5wJtdRXN" role="1tU5fm" />
@@ -13851,7 +13838,7 @@
             <node concept="2OqwBi" id="3u5wJtea$n" role="37vLTJ">
               <node concept="Xjq3P" id="3u5wJteamJ" role="2Oq$k0" />
               <node concept="2OwXpG" id="6nFpYlu6Qyb" role="2OqNvi">
-                <ref role="2Oxat5" node="6nFpYlu6O1H" resolve="nodeChangeTracker" />
+                <ref role="2Oxat5" node="6nFpYlu6O1H" resolve="changesTracker" />
               </node>
             </node>
             <node concept="2ShNRf" id="3u5wJtebs7" role="37vLTx">
@@ -13867,13 +13854,10 @@
         <node concept="3clFbF" id="6nFpYlvpO2s" role="3cqZAp">
           <node concept="2OqwBi" id="6nFpYlvpOkp" role="3clFbG">
             <node concept="37vLTw" id="6nFpYlvpO2q" role="2Oq$k0">
-              <ref role="3cqZAo" node="6nFpYlu6O1H" resolve="nodeChangeTracker" />
+              <ref role="3cqZAo" node="6nFpYlu6O1H" resolve="changesTracker" />
             </node>
             <node concept="liA8E" id="6nFpYlvpOJq" role="2OqNvi">
-              <ref role="37wK5l" node="2gPSxXTVH37" resolve="activate" />
-              <node concept="37vLTw" id="4mdCe2g_fES" role="37wK5m">
-                <ref role="3cqZAo" node="4mdCe2g_9K1" resolve="repo" />
-              </node>
+              <ref role="37wK5l" node="3GLv42NcIeZ" resolve="activate" />
             </node>
           </node>
         </node>
@@ -13890,13 +13874,10 @@
             <node concept="3clFbF" id="4jShfh66MJe" role="3cqZAp">
               <node concept="2OqwBi" id="4jShfh66Nhq" role="3clFbG">
                 <node concept="37vLTw" id="6nFpYlu6QHm" role="2Oq$k0">
-                  <ref role="3cqZAo" node="6nFpYlu6O1H" resolve="nodeChangeTracker" />
+                  <ref role="3cqZAo" node="6nFpYlu6O1H" resolve="changesTracker" />
                 </node>
                 <node concept="liA8E" id="4jShfh66NBh" role="2OqNvi">
-                  <ref role="37wK5l" node="2gPSxXTVH3S" resolve="deactivate" />
-                  <node concept="37vLTw" id="4mdCe2g_g4P" role="37wK5m">
-                    <ref role="3cqZAo" node="4mdCe2g_4HY" resolve="repo" />
-                  </node>
+                  <ref role="37wK5l" node="3GLv42Ne5DL" resolve="deactivate" />
                 </node>
               </node>
             </node>
@@ -13906,7 +13887,7 @@
                 <node concept="2OqwBi" id="3u5wJtec9g" role="37vLTJ">
                   <node concept="Xjq3P" id="3u5wJtebVC" role="2Oq$k0" />
                   <node concept="2OwXpG" id="6nFpYlu6QYK" role="2OqNvi">
-                    <ref role="2Oxat5" node="6nFpYlu6O1H" resolve="nodeChangeTracker" />
+                    <ref role="2Oxat5" node="6nFpYlu6O1H" resolve="changesTracker" />
                   </node>
                 </node>
               </node>
@@ -13915,17 +13896,11 @@
           <node concept="3y3z36" id="4jShfh66OX1" role="3clFbw">
             <node concept="10Nm6u" id="4jShfh66Pc_" role="3uHU7w" />
             <node concept="37vLTw" id="6nFpYlu6QBa" role="3uHU7B">
-              <ref role="3cqZAo" node="6nFpYlu6O1H" resolve="nodeChangeTracker" />
+              <ref role="3cqZAo" node="6nFpYlu6O1H" resolve="changesTracker" />
             </node>
           </node>
         </node>
       </node>
-      <node concept="37vLTG" id="4mdCe2g_4HY" role="3clF46">
-        <property role="TrG5h" value="repo" />
-        <node concept="3uibUv" id="4mdCe2g_4HX" role="1tU5fm">
-          <ref role="3uigEE" to="lui2:~SRepository" resolve="SRepository" />
-        </node>
-      </node>
     </node>
     <node concept="2tJIrI" id="6nFpYlu6Kdc" role="jymVt" />
     <node concept="3clFb_" id="6nFpYlu71k3" role="jymVt">
@@ -14068,10 +14043,17 @@
         <node concept="3cqZAl" id="2gPSxXTVNXm" role="3clF45" />
         <node concept="3Tm1VV" id="2gPSxXTVNXn" role="1B3o_S" />
         <node concept="3clFbS" id="2gPSxXTVNXo" role="3clF47">
-          <node concept="XkiVB" id="2gPSxXTVNX_" role="3cqZAp">
-            <ref role="37wK5l" node="2gPSxXTVH2K" resolve="ChangesTrackerBase" />
-            <node concept="37vLTw" id="2gPSxXTVNXB" role="37wK5m">
-              <ref role="3cqZAo" node="2gPSxXTVNXk" resolve="observable" />
+          <node concept="3clFbF" id="3GLv42NcQES" role="3cqZAp">
+            <node concept="37vLTI" id="3GLv42NcQET" role="3clFbG">
+              <node concept="37vLTw" id="3GLv42NcQEU" role="37vLTx">
+                <ref role="3cqZAo" node="2gPSxXTVNXk" resolve="observable" />
+              </node>
+              <node concept="2OqwBi" id="3GLv42NcQEV" role="37vLTJ">
+                <node concept="Xjq3P" id="3GLv42NcQEW" role="2Oq$k0" />
+                <node concept="2OwXpG" id="3GLv42NcQEX" role="2OqNvi">
+                  <ref role="2Oxat5" node="3GLv42NcOC7" resolve="observable" />
+                </node>
+              </node>
             </node>
           </node>
         </node>
@@ -14094,62 +14076,35 @@
               <node concept="2es0OD" id="6PD9XvnQH0Q" role="2OqNvi">
                 <node concept="1bVj0M" id="6PD9XvnQH0R" role="23t8la">
                   <node concept="3clFbS" id="6PD9XvnQH0S" role="1bW5cS">
-                    <node concept="3cpWs8" id="6PD9XvnQH0T" role="3cqZAp">
-                      <node concept="3cpWsn" id="6PD9XvnQH0U" role="3cpWs9">
-                        <property role="TrG5h" value="m" />
-                        <node concept="H_c77" id="6PD9XvnQH0V" role="1tU5fm" />
-                        <node concept="2OqwBi" id="6PD9XvnQH0W" role="33vP2m">
-                          <node concept="37vLTw" id="6PD9XvnQH0X" role="2Oq$k0">
-                            <ref role="3cqZAo" node="6PD9XvnQH1b" resolve="it" />
-                          </node>
-                          <node concept="liA8E" id="6PD9XvnQH0Y" role="2OqNvi">
-                            <ref role="37wK5l" to="mhbf:~SModelReference.resolve(org.jetbrains.mps.openapi.module.SRepository)" resolve="resolve" />
-                            <node concept="37vLTw" id="6PD9XvnQH0Z" role="37wK5m">
-                              <ref role="3cqZAo" node="6PD9XvnQFnO" resolve="repo" />
-                            </node>
+                    <node concept="3clFbF" id="6PD9XvnQH$1" role="3cqZAp">
+                      <node concept="2OqwBi" id="6PD9XvnQH$2" role="3clFbG">
+                        <node concept="liA8E" id="6PD9XvnQH$3" role="2OqNvi">
+                          <ref role="37wK5l" to="mhbf:~SModel.removeChangeListener(org.jetbrains.mps.openapi.model.SNodeChangeListener)" resolve="removeChangeListener" />
+                          <node concept="Xjq3P" id="6PD9XvnQH$4" role="37wK5m" />
+                        </node>
+                        <node concept="2JrnkZ" id="6PD9XvnQH$5" role="2Oq$k0">
+                          <node concept="37vLTw" id="3GLv42NdYKf" role="2JrQYb">
+                            <ref role="3cqZAo" node="6PD9XvnQH1b" resolve="m" />
                           </node>
                         </node>
                       </node>
                     </node>
-                    <node concept="3clFbJ" id="6PD9XvnQH10" role="3cqZAp">
-                      <node concept="3clFbS" id="6PD9XvnQH11" role="3clFbx">
-                        <node concept="3clFbF" id="6PD9XvnQH$1" role="3cqZAp">
-                          <node concept="2OqwBi" id="6PD9XvnQH$2" role="3clFbG">
-                            <node concept="liA8E" id="6PD9XvnQH$3" role="2OqNvi">
-                              <ref role="37wK5l" to="mhbf:~SModel.removeChangeListener(org.jetbrains.mps.openapi.model.SNodeChangeListener)" resolve="removeChangeListener" />
-                              <node concept="Xjq3P" id="6PD9XvnQH$4" role="37wK5m" />
-                            </node>
-                            <node concept="2JrnkZ" id="6PD9XvnQH$5" role="2Oq$k0">
-                              <node concept="37vLTw" id="6PD9XvnQH$6" role="2JrQYb">
-                                <ref role="3cqZAo" node="6PD9XvnQH0U" resolve="m" />
-                              </node>
-                            </node>
-                          </node>
+                    <node concept="3clFbF" id="6PD9XvnQH12" role="3cqZAp">
+                      <node concept="2OqwBi" id="6PD9XvnQH13" role="3clFbG">
+                        <node concept="liA8E" id="6PD9XvnQH14" role="2OqNvi">
+                          <ref role="37wK5l" to="mhbf:~SModel.addChangeListener(org.jetbrains.mps.openapi.model.SNodeChangeListener)" resolve="addChangeListener" />
+                          <node concept="Xjq3P" id="6PD9XvnQH15" role="37wK5m" />
                         </node>
-                        <node concept="3clFbF" id="6PD9XvnQH12" role="3cqZAp">
-                          <node concept="2OqwBi" id="6PD9XvnQH13" role="3clFbG">
-                            <node concept="liA8E" id="6PD9XvnQH14" role="2OqNvi">
-                              <ref role="37wK5l" to="mhbf:~SModel.addChangeListener(org.jetbrains.mps.openapi.model.SNodeChangeListener)" resolve="addChangeListener" />
-                              <node concept="Xjq3P" id="6PD9XvnQH15" role="37wK5m" />
-                            </node>
-                            <node concept="2JrnkZ" id="6PD9XvnQH16" role="2Oq$k0">
-                              <node concept="37vLTw" id="6PD9XvnQH17" role="2JrQYb">
-                                <ref role="3cqZAo" node="6PD9XvnQH0U" resolve="m" />
-                              </node>
-                            </node>
+                        <node concept="2JrnkZ" id="6PD9XvnQH16" role="2Oq$k0">
+                          <node concept="37vLTw" id="3GLv42NdYRU" role="2JrQYb">
+                            <ref role="3cqZAo" node="6PD9XvnQH1b" resolve="m" />
                           </node>
                         </node>
                       </node>
-                      <node concept="3y3z36" id="6PD9XvnQH18" role="3clFbw">
-                        <node concept="10Nm6u" id="6PD9XvnQH19" role="3uHU7w" />
-                        <node concept="37vLTw" id="6PD9XvnQH1a" role="3uHU7B">
-                          <ref role="3cqZAo" node="6PD9XvnQH0U" resolve="m" />
-                        </node>
-                      </node>
                     </node>
                   </node>
                   <node concept="Rh6nW" id="6PD9XvnQH1b" role="1bW2Oz">
-                    <property role="TrG5h" value="it" />
+                    <property role="TrG5h" value="m" />
                     <node concept="2jxLKc" id="6PD9XvnQH1c" role="1tU5fm" />
                   </node>
                 </node>
@@ -14160,6 +14115,134 @@
         <node concept="3Tm1VV" id="6PD9XvnQChN" role="1B3o_S" />
         <node concept="3cqZAl" id="6PD9XvnQDwp" role="3clF45" />
       </node>
+      <node concept="2tJIrI" id="3GLv42NcCdJ" role="jymVt" />
+      <node concept="3clFb_" id="3GLv42NcIeZ" role="jymVt">
+        <property role="TrG5h" value="activate" />
+        <node concept="3cqZAl" id="3GLv42NcIf1" role="3clF45" />
+        <node concept="3Tm6S6" id="3GLv42NcIf2" role="1B3o_S" />
+        <node concept="3clFbS" id="3GLv42NcIf3" role="3clF47">
+          <node concept="3clFbF" id="3GLv42Ne9Yw" role="3cqZAp">
+            <node concept="2OqwBi" id="3GLv42Ne9Yx" role="3clFbG">
+              <node concept="1rXfSq" id="3GLv42Ne9Yy" role="2Oq$k0">
+                <ref role="37wK5l" node="3DPJ8QIkRmQ" resolve="getRelevantModels" />
+              </node>
+              <node concept="2es0OD" id="3GLv42Ne9Yz" role="2OqNvi">
+                <node concept="1bVj0M" id="3GLv42Ne9Y$" role="23t8la">
+                  <node concept="3clFbS" id="3GLv42Ne9Y_" role="1bW5cS">
+                    <node concept="3clFbF" id="3GLv42Ne9YJ" role="3cqZAp">
+                      <node concept="2OqwBi" id="3GLv42Ne9YK" role="3clFbG">
+                        <node concept="liA8E" id="3GLv42Ne9YL" role="2OqNvi">
+                          <ref role="37wK5l" to="mhbf:~SModel.addChangeListener(org.jetbrains.mps.openapi.model.SNodeChangeListener)" resolve="addChangeListener" />
+                          <node concept="Xjq3P" id="3GLv42Ne9YM" role="37wK5m" />
+                        </node>
+                        <node concept="2JrnkZ" id="3GLv42Ne9YN" role="2Oq$k0">
+                          <node concept="37vLTw" id="3GLv42NebhA" role="2JrQYb">
+                            <ref role="3cqZAo" node="3GLv42Ne9YS" resolve="m" />
+                          </node>
+                        </node>
+                      </node>
+                    </node>
+                  </node>
+                  <node concept="Rh6nW" id="3GLv42Ne9YS" role="1bW2Oz">
+                    <property role="TrG5h" value="m" />
+                    <node concept="2jxLKc" id="3GLv42Ne9YT" role="1tU5fm" />
+                  </node>
+                </node>
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="3GLv42NcNT7" role="3cqZAp">
+            <node concept="2OqwBi" id="3GLv42NcNT8" role="3clFbG">
+              <node concept="2JrnkZ" id="3GLv42NcNT9" role="2Oq$k0">
+                <node concept="37vLTw" id="3GLv42NdZ1a" role="2JrQYb">
+                  <ref role="3cqZAo" node="3GLv42NcOC7" resolve="observable" />
+                </node>
+              </node>
+              <node concept="liA8E" id="3GLv42NcNTb" role="2OqNvi">
+                <ref role="37wK5l" to="mhbf:~SModel.addChangeListener(org.jetbrains.mps.openapi.model.SNodeChangeListener)" resolve="addChangeListener" />
+                <node concept="Xjq3P" id="3GLv42NcNTc" role="37wK5m" />
+              </node>
+            </node>
+          </node>
+          <node concept="3clFbF" id="3GLv42NcNTd" role="3cqZAp">
+            <node concept="2OqwBi" id="3GLv42NcNTe" role="3clFbG">
+              <node concept="2JrnkZ" id="3GLv42NcNTf" role="2Oq$k0">
+                <node concept="37vLTw" id="3GLv42NdZl2" role="2JrQYb">
+                  <ref role="3cqZAo" node="3GLv42NcOC7" resolve="observable" />
+                </node>
+              </node>
+              <node concept="liA8E" id="3GLv42NcNTh" role="2OqNvi">
+                <ref role="37wK5l" to="mhbf:~SModel.addModelListener(org.jetbrains.mps.openapi.model.SModelListener)" resolve="addModelListener" />
+                <node concept="Xjq3P" id="3GLv42NcNTi" role="37wK5m" />
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+      <node concept="3clFb_" id="3GLv42Ne5DL" role="jymVt">
+        <property role="TrG5h" value="deactivate" />
+        <node concept="3cqZAl" id="3GLv42Ne5DM" role="3clF45" />
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+                <ref role="37wK5l" node="3DPJ8QIkRmQ" resolve="getRelevantModels" />
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+                        <node concept="liA8E" id="3GLv42NebOc" role="2OqNvi">
+                          <ref role="37wK5l" to="mhbf:~SModel.removeChangeListener(org.jetbrains.mps.openapi.model.SNodeChangeListener)" resolve="removeChangeListener" />
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+                  <node concept="Rh6nW" id="3GLv42NebOj" role="1bW2Oz">
+                    <property role="TrG5h" value="m" />
+                    <node concept="2jxLKc" id="3GLv42NebOk" role="1tU5fm" />
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+              </node>
+              <node concept="liA8E" id="3GLv42Ne5Ep" role="2OqNvi">
+                <ref role="37wK5l" to="mhbf:~SModel.removeChangeListener(org.jetbrains.mps.openapi.model.SNodeChangeListener)" resolve="removeChangeListener" />
+                <node concept="Xjq3P" id="3GLv42Ne5Eq" role="37wK5m" />
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+                <node concept="37vLTw" id="3GLv42Ne5Eu" role="2JrQYb">
+                  <ref role="3cqZAo" node="3GLv42NcOC7" resolve="observable" />
+                </node>
+              </node>
+              <node concept="liA8E" id="3GLv42Ne5Ev" role="2OqNvi">
+                <ref role="37wK5l" to="mhbf:~SModel.removeModelListener(org.jetbrains.mps.openapi.model.SModelListener)" resolve="removeModelListener" />
+                <node concept="Xjq3P" id="3GLv42Ne5Ew" role="37wK5m" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
       <node concept="2tJIrI" id="4jShfh66$Av" role="jymVt" />
       <node concept="3clFb_" id="4jShfh66BqK" role="jymVt">
         <property role="TrG5h" value="modelDetached" />
@@ -14181,9 +14264,6 @@
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             <node concept="1rXfSq" id="6nFpYlu70uj" role="3clFbG">
               <ref role="37wK5l" node="3u5wJte1ac" resolve="stopTrackingChanges" />
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-                <ref role="3cqZAo" node="4jShfh66BqQ" resolve="repository" />
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@@ -14207,16 +14287,6 @@
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               <ref role="37wK5l" node="3u5wJte1ac" resolve="stopTrackingChanges" />
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-                <node concept="liA8E" id="4mdCe2g_kqu" role="2OqNvi">
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-                </node>
-                <node concept="2JrnkZ" id="4mdCe2g_jZL" role="2Oq$k0">
-                  <node concept="37vLTw" id="4mdCe2g_iRH" role="2JrQYb">
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-                </node>
-              </node>
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@@ -14246,7 +14316,7 @@
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               </node>
               <node concept="liA8E" id="357z3MCehDP" role="2OqNvi">
-                <ref role="37wK5l" node="357z3MCdcHk" resolve="isRelevant" />
+                <ref role="37wK5l" node="3GLv42NdnXR" resolve="isRelevant" />
                 <node concept="37vLTw" id="357z3MCehMs" role="37wK5m">
                   <ref role="3cqZAo" node="6nFpYltKQqr" resolve="event" />
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@@ -14319,7 +14389,7 @@
                 <ref role="3cqZAo" node="357z3MCpd1F" resolve="relevantNodesMonitor" />
               </node>
               <node concept="liA8E" id="357z3MCeiab" role="2OqNvi">
-                <ref role="37wK5l" node="357z3MCdcHw" resolve="isRelevant" />
+                <ref role="37wK5l" node="3GLv42NdnY3" resolve="isRelevant" />
                 <node concept="37vLTw" id="357z3MCeiac" role="37wK5m">
                   <ref role="3cqZAo" node="6nFpYltKQq$" resolve="event" />
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@@ -14390,7 +14460,7 @@
                 <ref role="3cqZAo" node="357z3MCpd1F" resolve="relevantNodesMonitor" />
               </node>
               <node concept="liA8E" id="357z3MCeiDw" role="2OqNvi">
-                <ref role="37wK5l" node="357z3MCdcHG" resolve="isRelevant" />
+                <ref role="37wK5l" node="3GLv42NdnYf" resolve="isRelevant" />
                 <node concept="37vLTw" id="357z3MCeiDx" role="37wK5m">
                   <ref role="3cqZAo" node="6nFpYltKQqH" resolve="event" />
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@@ -14461,7 +14531,7 @@
                 <ref role="3cqZAo" node="357z3MCpd1F" resolve="relevantNodesMonitor" />
               </node>
               <node concept="liA8E" id="357z3MCej8S" role="2OqNvi">
-                <ref role="37wK5l" node="357z3MCdcHX" resolve="isRelevant" />
+                <ref role="37wK5l" node="3GLv42NdnYw" resolve="isRelevant" />
                 <node concept="37vLTw" id="357z3MCej8T" role="37wK5m">
                   <ref role="3cqZAo" node="6nFpYltKQqQ" resolve="event" />
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@@ -14474,16 +14544,11 @@
         </node>
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       <node concept="2tJIrI" id="3DPJ8QIkPQK" role="jymVt" />
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-        <ref role="3uigEE" node="2gPSxXTVEd1" resolve="ChangesTrackerBase" />
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       <node concept="3clFb_" id="3DPJ8QIkRmQ" role="jymVt">
         <property role="TrG5h" value="getRelevantModels" />
         <node concept="3Tm1VV" id="3DPJ8QIkRmS" role="1B3o_S" />
-        <node concept="3vKaQO" id="3DPJ8QIkRmT" role="3clF45">
-          <node concept="3uibUv" id="3DPJ8QIkRmU" role="3O5elw">
-            <ref role="3uigEE" to="mhbf:~SModelReference" resolve="SModelReference" />
-          </node>
+        <node concept="3vKaQO" id="3GLv42Nd1CY" role="3clF45">
+          <node concept="H_c77" id="3GLv42Nd1CZ" role="3O5elw" />
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         <node concept="3clFbS" id="3DPJ8QIkRmV" role="3clF47">
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@@ -14492,16 +14557,596 @@
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               <node concept="liA8E" id="3DPJ8QIkTY1" role="2OqNvi">
-                <ref role="37wK5l" node="3x4yg2Xg7_W" resolve="getRelevantModels" />
+                <ref role="37wK5l" node="3GLv42NdnXb" resolve="getRelevantModels" />
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             </node>
           </node>
         </node>
-        <node concept="2AHcQZ" id="3DPJ8QIkRmW" role="2AJF6D">
-          <ref role="2AI5Lk" to="wyt6:~Override" resolve="Override" />
-        </node>
+      </node>
+      <node concept="2tJIrI" id="3GLv42NcA8t" role="jymVt" />
+      <node concept="312cEg" id="3GLv42NcOC7" role="jymVt">
+        <property role="TrG5h" value="observable" />
+        <node concept="3Tm6S6" id="3GLv42NcOC8" role="1B3o_S" />
+        <node concept="H_c77" id="3GLv42NcOC9" role="1tU5fm" />
+      </node>
+      <node concept="3uibUv" id="3GLv42NcUtL" role="1zkMxy">
+        <ref role="3uigEE" to="mhbf:~SModelListenerBase" resolve="SModelListenerBase" />
+      </node>
+      <node concept="3uibUv" id="3GLv42NcX9K" role="EKbjA">
+        <ref role="3uigEE" to="mhbf:~SNodeChangeListener" resolve="SNodeChangeListener" />
       </node>
     </node>
+    <node concept="2tJIrI" id="3GLv42Ndv3W" role="jymVt" />
+    <node concept="312cEu" id="3GLv42NdnWW" role="jymVt">
+      <property role="TrG5h" value="RelevantNodesMonitor" />
+      <node concept="2tJIrI" id="3GLv42NdnWX" role="jymVt" />
+      <node concept="3clFbW" id="3GLv42NdnWY" role="jymVt">
+        <node concept="37vLTG" id="3GLv42NdnWZ" role="3clF46">
+          <property role="TrG5h" value="unit" />
+          <node concept="3Tqbb2" id="3GLv42NdnX0" role="1tU5fm" />
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+                <ref role="3cqZAo" node="3GLv42NdnWZ" resolve="unit" />
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+        <property role="TrG5h" value="getRelevantModels" />
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+              <node concept="37vLTw" id="3GLv42NdnXf" role="2Oq$k0">
+                <ref role="3cqZAo" node="3GLv42Ndo1b" resolve="referredModels" />
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+              <node concept="26Dbio" id="3GLv42NdnXg" role="2OqNvi" />
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+      <node concept="3clFb_" id="3GLv42NdnXl" role="jymVt">
+        <property role="TrG5h" value="getRelevantOrigins" />
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+                  <ref role="3cqZAo" node="3GLv42Ndo10" resolve="origin2relevantNodes" />
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+          <node concept="3uibUv" id="3GLv42NdnXT" role="1tU5fm">
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+                  <ref role="37wK5l" to="cmfw:~SPropertyChangeEvent.getNode()" resolve="getNode" />
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+              </node>
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+                <node concept="liA8E" id="3GLv42NdnYd" role="2OqNvi">
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+            <ref role="3uigEE" to="cmfw:~SNodeAddEvent" resolve="SNodeAddEvent" />
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+        <node concept="3Tm6S6" id="3GLv42Ndo11" role="1B3o_S" />
+        <node concept="3rvAFt" id="3GLv42Ndo12" role="1tU5fm">
+          <node concept="2sp9CU" id="3GLv42Ndo13" role="3rvQeY" />
+          <node concept="2hMVRd" id="3GLv42Ndo14" role="3rvSg0">
+            <node concept="3uibUv" id="3GLv42Ndo15" role="2hN53Y">
+              <ref role="3uigEE" to="mhbf:~SNodeId" resolve="SNodeId" />
+            </node>
+          </node>
+        </node>
+        <node concept="2ShNRf" id="3GLv42Ndo16" role="33vP2m">
+          <node concept="3rGOSV" id="3GLv42Ndo17" role="2ShVmc">
+            <node concept="2sp9CU" id="3GLv42Ndo18" role="3rHrn6" />
+            <node concept="2hMVRd" id="3GLv42Ndo19" role="3rHtpV">
+              <node concept="3uibUv" id="3GLv42Ndo1a" role="2hN53Y">
+                <ref role="3uigEE" to="mhbf:~SNodeId" resolve="SNodeId" />
+              </node>
+            </node>
+          </node>
+        </node>
+      </node>
+      <node concept="312cEg" id="3GLv42Ndo1b" role="jymVt">
+        <property role="TrG5h" value="referredModels" />
+        <node concept="3Tm6S6" id="3GLv42Ndo1c" role="1B3o_S" />
+        <node concept="2hMVRd" id="3GLv42Ndo1d" role="1tU5fm">
+          <node concept="H_c77" id="3GLv42NdWmQ" role="2hN53Y" />
+        </node>
+        <node concept="2ShNRf" id="3GLv42Ndo1f" role="33vP2m">
+          <node concept="2i4dXS" id="3GLv42Ndo1g" role="2ShVmc">
+            <node concept="H_c77" id="3GLv42NdX5R" role="HW$YZ" />
+          </node>
+        </node>
+      </node>
+      <node concept="3Tm6S6" id="3GLv42Nd_WF" role="1B3o_S" />
+    </node>
+    <node concept="2tJIrI" id="3GLv42NdjZX" role="jymVt" />
     <node concept="2tJIrI" id="357z3MC8N8k" role="jymVt" />
     <node concept="312cEg" id="6nFpYlu3FKa" role="jymVt">
       <property role="TrG5h" value="reversedRequirements" />
@@ -14558,7 +15203,7 @@
       </node>
     </node>
     <node concept="312cEg" id="6nFpYlu6O1H" role="jymVt">
-      <property role="TrG5h" value="nodeChangeTracker" />
+      <property role="TrG5h" value="changesTracker" />
       <node concept="3Tm6S6" id="6nFpYlu6O1I" role="1B3o_S" />
       <node concept="3uibUv" id="6nFpYlu6PXo" role="1tU5fm">
         <ref role="3uigEE" node="6nFpYltKKoQ" resolve="UpdatesRecorder.ChangesTracker" />
@@ -14567,8 +15212,8 @@
     <node concept="312cEg" id="357z3MCpd1F" role="jymVt">
       <property role="TrG5h" value="relevantNodesMonitor" />
       <node concept="3Tm6S6" id="357z3MCp7gl" role="1B3o_S" />
-      <node concept="3uibUv" id="3DPJ8QImdkS" role="1tU5fm">
-        <ref role="3uigEE" node="357z3MCcYVD" resolve="RelevantNodesMonitor" />
+      <node concept="3uibUv" id="3GLv42NdCHT" role="1tU5fm">
+        <ref role="3uigEE" node="3GLv42NdnWW" resolve="UpdatesRecorder.RelevantNodesMonitor" />
       </node>
     </node>
     <node concept="312cEg" id="6nFpYlu6n2t" role="jymVt">
@@ -14657,857 +15302,6 @@
       <ref role="3uigEE" to="i348:4VNF0fT1sxk" resolve="NodeRequirementsRecorder" />
     </node>
   </node>
-  <node concept="312cEu" id="2gPSxXTVEd1">
-    <property role="TrG5h" value="ChangesTrackerBase" />
-    <property role="1sVAO0" value="true" />
-    <node concept="2tJIrI" id="2gPSxXTVHWY" role="jymVt" />
-    <node concept="3clFbW" id="2gPSxXTVH2K" role="jymVt">
-      <node concept="37vLTG" id="2gPSxXTVH2N" role="3clF46">
-        <property role="TrG5h" value="observable" />
-        <node concept="H_c77" id="2gPSxXTVH2O" role="1tU5fm" />
-      </node>
-      <node concept="3cqZAl" id="2gPSxXTVH2P" role="3clF45" />
-      <node concept="3Tm1VV" id="2gPSxXTVKct" role="1B3o_S" />
-      <node concept="3clFbS" id="2gPSxXTVH2R" role="3clF47">
-        <node concept="3clFbF" id="2gPSxXTVH2Y" role="3cqZAp">
-          <node concept="37vLTI" id="2gPSxXTVH2Z" role="3clFbG">
-            <node concept="37vLTw" id="2gPSxXTVH30" role="37vLTx">
-              <ref role="3cqZAo" node="2gPSxXTVH2N" resolve="observable" />
-            </node>
-            <node concept="2OqwBi" id="2gPSxXTVH31" role="37vLTJ">
-              <node concept="Xjq3P" id="2gPSxXTVH32" role="2Oq$k0" />
-              <node concept="2OwXpG" id="2gPSxXTVH33" role="2OqNvi">
-                <ref role="2Oxat5" node="2gPSxXTVG_O" resolve="observable" />
-              </node>
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-    <node concept="2tJIrI" id="2gPSxXTVH36" role="jymVt" />
-    <node concept="3clFb_" id="2gPSxXTVH37" role="jymVt">
-      <property role="TrG5h" value="activate" />
-      <node concept="37vLTG" id="4mdCe2g$EBy" role="3clF46">
-        <property role="TrG5h" value="repo" />
-        <node concept="3uibUv" id="4mdCe2g$ETO" role="1tU5fm">
-          <ref role="3uigEE" to="lui2:~SRepository" resolve="SRepository" />
-        </node>
-      </node>
-      <node concept="3cqZAl" id="2gPSxXTVH38" role="3clF45" />
-      <node concept="3Tm1VV" id="2gPSxXTVKdL" role="1B3o_S" />
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-                <node concept="1rXfSq" id="3DPJ8QIrCS0" role="2Oq$k0">
-                  <ref role="37wK5l" node="3DPJ8QIkN6S" resolve="getRelevantModels" />
-                </node>
-                <node concept="2es0OD" id="2gPSxXTVH3g" role="2OqNvi">
-                  <node concept="1bVj0M" id="2gPSxXTVH3h" role="23t8la">
-                    <node concept="3clFbS" id="2gPSxXTVH3i" role="1bW5cS">
-                      <node concept="3cpWs8" id="2gPSxXTVH3j" role="3cqZAp">
-                        <node concept="3cpWsn" id="2gPSxXTVH3k" role="3cpWs9">
-                          <property role="TrG5h" value="m" />
-                          <node concept="H_c77" id="2gPSxXTVH3l" role="1tU5fm" />
-                          <node concept="2OqwBi" id="4mdCe2g$L2A" role="33vP2m">
-                            <node concept="37vLTw" id="4mdCe2g$KOR" role="2Oq$k0">
-                              <ref role="3cqZAo" node="2gPSxXTVH3D" resolve="it" />
-                            </node>
-                            <node concept="liA8E" id="4mdCe2g$Ljv" role="2OqNvi">
-                              <ref role="37wK5l" to="mhbf:~SModelReference.resolve(org.jetbrains.mps.openapi.module.SRepository)" resolve="resolve" />
-                              <node concept="37vLTw" id="4mdCe2g$LvH" role="37wK5m">
-                                <ref role="3cqZAo" node="4mdCe2g$EBy" resolve="repo" />
-                              </node>
-                            </node>
-                          </node>
-                        </node>
-                      </node>
-                      <node concept="3clFbJ" id="2gPSxXTVH3u" role="3cqZAp">
-                        <node concept="3clFbS" id="2gPSxXTVH3v" role="3clFbx">
-                          <node concept="3clFbF" id="2gPSxXTVH3w" role="3cqZAp">
-                            <node concept="2OqwBi" id="2gPSxXTVH3x" role="3clFbG">
-                              <node concept="liA8E" id="2gPSxXTVH3y" role="2OqNvi">
-                                <ref role="37wK5l" to="mhbf:~SModel.addChangeListener(org.jetbrains.mps.openapi.model.SNodeChangeListener)" resolve="addChangeListener" />
-                                <node concept="Xjq3P" id="2gPSxXTVH3z" role="37wK5m" />
-                              </node>
-                              <node concept="2JrnkZ" id="2gPSxXTVH3$" role="2Oq$k0">
-                                <node concept="37vLTw" id="2gPSxXTVH3_" role="2JrQYb">
-                                  <ref role="3cqZAo" node="2gPSxXTVH3k" resolve="m" />
-                                </node>
-                              </node>
-                            </node>
-                          </node>
-                        </node>
-                        <node concept="3y3z36" id="2gPSxXTVH3A" role="3clFbw">
-                          <node concept="10Nm6u" id="2gPSxXTVH3B" role="3uHU7w" />
-                          <node concept="37vLTw" id="2gPSxXTVH3C" role="3uHU7B">
-                            <ref role="3cqZAo" node="2gPSxXTVH3k" resolve="m" />
-                          </node>
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-                    </node>
-                    <node concept="Rh6nW" id="2gPSxXTVH3D" role="1bW2Oz">
-                      <property role="TrG5h" value="it" />
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-              <ref role="3cqZAo" node="4mdCe2g$EBy" resolve="repo" />
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-        <node concept="3clFbH" id="4mdCe2gAtJK" role="3cqZAp" />
-        <node concept="3clFbF" id="2gPSxXTVH3F" role="3cqZAp">
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-                <ref role="3cqZAo" node="2gPSxXTVG_O" resolve="observable" />
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-                        <node concept="3cpWsn" id="2gPSxXTVH45" role="3cpWs9">
-                          <property role="TrG5h" value="m" />
-                          <node concept="H_c77" id="2gPSxXTVH46" role="1tU5fm" />
-                          <node concept="2OqwBi" id="4mdCe2g$LYM" role="33vP2m">
-                            <node concept="37vLTw" id="4mdCe2g$LN5" role="2Oq$k0">
-                              <ref role="3cqZAo" node="2gPSxXTVH4q" resolve="it" />
-                            </node>
-                            <node concept="liA8E" id="4mdCe2g$MfF" role="2OqNvi">
-                              <ref role="37wK5l" to="mhbf:~SModelReference.resolve(org.jetbrains.mps.openapi.module.SRepository)" resolve="resolve" />
-                              <node concept="37vLTw" id="4mdCe2g$Mse" role="37wK5m">
-                                <ref role="3cqZAo" node="4mdCe2g$FsE" resolve="repo" />
-                              </node>
-                            </node>
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diff --git a/coderules/solutions/jetbrains.mps.coderules.typechecking.test/models/jetbrains.mps.coderules.typechecking.test.util.mps b/coderules/solutions/jetbrains.mps.coderules.typechecking.test/models/jetbrains.mps.coderules.typechecking.test.util.mps
index a1db5165..dcf2bebf 100644
--- a/coderules/solutions/jetbrains.mps.coderules.typechecking.test/models/jetbrains.mps.coderules.typechecking.test.util.mps
+++ b/coderules/solutions/jetbrains.mps.coderules.typechecking.test/models/jetbrains.mps.coderules.typechecking.test.util.mps
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diff --git a/coderules/solutions/jetbrains.mps.coderules.typechecking/models/jetbrains.mps.coderules.typechecking.service.mps b/coderules/solutions/jetbrains.mps.coderules.typechecking/models/jetbrains.mps.coderules.typechecking.service.mps
index ba8a8178..9ee60f85 100644
--- a/coderules/solutions/jetbrains.mps.coderules.typechecking/models/jetbrains.mps.coderules.typechecking.service.mps
+++ b/coderules/solutions/jetbrains.mps.coderules.typechecking/models/jetbrains.mps.coderules.typechecking.service.mps
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