diff --git a/src/commands/CmdLengthen.cpp b/src/commands/CmdLengthen.cpp
index f0dc4a36..2ad0eaea 100644
--- a/src/commands/CmdLengthen.cpp
+++ b/src/commands/CmdLengthen.cpp
@@ -59,7 +59,30 @@ int CmdLengthen (
   Interval filter;
   auto tracked = getTracked (database, rules, filter);
 
-  // Apply tags to ids.
+  bool dirty = true;
+
+  for (auto& id : ids)
+  {
+    if (id > static_cast <int> (tracked.size ()))
+      throw format ("ID '@{1}' does not correspond to any tracking.", id);
+
+    if (tracked[tracked.size() - id].synthetic && dirty)
+    {
+      auto latest = getLatestInterval(database);
+      auto exclusions = getAllExclusions (rules, filter.range);
+
+      Interval modified {latest};
+
+      // Update database.
+      database.deleteInterval (latest);
+      for (auto& interval : flatten (modified, exclusions))
+        database.addInterval (interval);
+
+      dirty = false;
+    }
+  }
+
+  // Lengthen intervals specified by ids
   for (auto& id : ids)
   {
     if (id > static_cast <int> (tracked.size ()))
diff --git a/src/commands/CmdMove.cpp b/src/commands/CmdMove.cpp
index e083b105..8bd2762e 100644
--- a/src/commands/CmdMove.cpp
+++ b/src/commands/CmdMove.cpp
@@ -64,9 +64,23 @@ int CmdMove (
   Interval filter;
   auto tracked = getTracked (database, rules, filter);
 
+
   if (id > static_cast <int> (tracked.size ()))
     throw format ("ID '@{1}' does not correspond to any tracking.", id);
 
+  if (tracked[tracked.size() - id].synthetic)
+  {
+    auto latest = getLatestInterval(database);
+    auto exclusions = getAllExclusions (rules, filter.range);
+
+    Interval modified {latest};
+
+    // Update database.
+    database.deleteInterval (latest);
+    for (auto& interval : flatten (modified, exclusions))
+      database.addInterval (interval);
+  }
+
   // Move start time.
   Interval i = tracked[tracked.size () - id];
   Datetime start (new_start);
diff --git a/src/commands/CmdShorten.cpp b/src/commands/CmdShorten.cpp
index bd040769..5a4a6825 100644
--- a/src/commands/CmdShorten.cpp
+++ b/src/commands/CmdShorten.cpp
@@ -59,7 +59,30 @@ int CmdShorten (
   Interval filter;
   auto tracked = getTracked (database, rules, filter);
 
-  // Apply tags to ids.
+  bool dirty = true;
+
+  for (auto& id : ids)
+  {
+    if (id > static_cast <int> (tracked.size ()))
+      throw format ("ID '@{1}' does not correspond to any tracking.", id);
+
+    if (tracked[tracked.size() - id].synthetic && dirty)
+    {
+      auto latest = getLatestInterval(database);
+      auto exclusions = getAllExclusions (rules, filter.range);
+
+      Interval modified {latest};
+
+      // Update database.
+      database.deleteInterval (latest);
+      for (auto& interval : flatten (modified, exclusions))
+        database.addInterval (interval);
+
+      dirty = false;
+    }
+  }
+
+  // Shorten intervals specified by ids
   for (auto& id : ids)
   {
     if (id > static_cast <int> (tracked.size ()))
diff --git a/src/commands/CmdTag.cpp b/src/commands/CmdTag.cpp
index 64485c12..46054d32 100644
--- a/src/commands/CmdTag.cpp
+++ b/src/commands/CmdTag.cpp
@@ -57,6 +57,29 @@ int CmdTag (
   Interval filter;
   auto tracked = getTracked (database, rules, filter);
 
+  bool dirty = true;
+
+  for (auto& id : ids)
+  {
+    if (id > static_cast <int> (tracked.size ()))
+      throw format ("ID '@{1}' does not correspond to any tracking.", id);
+
+    if (tracked[tracked.size() - id].synthetic && dirty)
+    {
+      auto latest = getLatestInterval(database);
+      auto exclusions = getAllExclusions (rules, filter.range);
+
+      Interval modified {latest};
+
+      // Update database.
+      database.deleteInterval (latest);
+      for (auto& interval : flatten (modified, exclusions))
+        database.addInterval (interval);
+
+      dirty = false;
+    }
+  }
+
   // Apply tags to ids.
   for (auto& id : ids)
   {
diff --git a/src/commands/CmdUntag.cpp b/src/commands/CmdUntag.cpp
index 936965a3..562d19e7 100644
--- a/src/commands/CmdUntag.cpp
+++ b/src/commands/CmdUntag.cpp
@@ -57,6 +57,29 @@ int CmdUntag (
   Interval filter;
   auto tracked = getTracked (database, rules, filter);
 
+  bool dirty = true;
+
+  for (auto& id : ids)
+  {
+    if (id > static_cast <int> (tracked.size ()))
+      throw format ("ID '@{1}' does not correspond to any tracking.", id);
+
+    if (tracked[tracked.size() - id].synthetic && dirty)
+    {
+      auto latest = getLatestInterval(database);
+      auto exclusions = getAllExclusions (rules, filter.range);
+
+      Interval modified {latest};
+
+      // Update database.
+      database.deleteInterval (latest);
+      for (auto& interval : flatten (modified, exclusions))
+        database.addInterval (interval);
+
+      dirty = false;
+    }
+  }
+
   // Apply tags to ids.
   for (auto& id : ids)
   {