diff --git a/includes/controller/shift_entries_controller.php b/includes/controller/shift_entries_controller.php
index 54c57332..03d7a27f 100644
--- a/includes/controller/shift_entries_controller.php
+++ b/includes/controller/shift_entries_controller.php
@@ -269,10 +269,7 @@ function shift_entry_delete_controller()
             redirect(page_link_to('user_shifts'));
         }
 
-        $result = ShiftEntry_delete($entry_id);
-        if ($result === false) {
-            engelsystem_error('Unable to delete shift entry.');
-        }
+        ShiftEntry_delete($entry_id);
 
         engelsystem_log(
             'Deleted ' . User_Nick_render($shift_entry_source) . '\'s shift: ' . $shift_entry_source['name']
diff --git a/includes/controller/shifttypes_controller.php b/includes/controller/shifttypes_controller.php
index 790bbb56..f4791511 100644
--- a/includes/controller/shifttypes_controller.php
+++ b/includes/controller/shifttypes_controller.php
@@ -28,10 +28,7 @@ function shifttype_delete_controller()
     }
 
     if ($request->has('confirmed')) {
-        $result = ShiftType_delete($shifttype['id']);
-        if (empty($result)) {
-            engelsystem_error('Unable to delete shifttype.');
-        }
+        ShiftType_delete($shifttype['id']);
 
         engelsystem_log('Deleted shifttype ' . $shifttype['name']);
         success(sprintf(_('Shifttype %s deleted.'), $shifttype['name']));
diff --git a/includes/controller/user_angeltypes_controller.php b/includes/controller/user_angeltypes_controller.php
index 41185552..ab16139a 100644
--- a/includes/controller/user_angeltypes_controller.php
+++ b/includes/controller/user_angeltypes_controller.php
@@ -215,10 +215,7 @@ function user_angeltype_delete_controller()
     }
 
     if ($request->has('confirmed')) {
-        $result = UserAngelType_delete($user_angeltype);
-        if ($result === false) {
-            engelsystem_error('Unable to delete user angeltype.');
-        }
+        UserAngelType_delete($user_angeltype);
 
         $success_message = sprintf(_('User %s removed from %s.'), User_Nick_render($user_source), $angeltype['name']);
         engelsystem_log($success_message);
diff --git a/includes/controller/users_controller.php b/includes/controller/users_controller.php
index f441c8af..05b97716 100644
--- a/includes/controller/users_controller.php
+++ b/includes/controller/users_controller.php
@@ -76,10 +76,7 @@ function user_delete_controller()
         }
 
         if ($valid) {
-            $result = User_delete($user_source['UID']);
-            if ($result === false) {
-                engelsystem_error('Unable to delete user.');
-            }
+            User_delete($user_source['UID']);
 
             mail_user_delete($user_source);
             success(_('User deleted.'));
diff --git a/includes/model/AngelType_model.php b/includes/model/AngelType_model.php
index af213432..b9238467 100644
--- a/includes/model/AngelType_model.php
+++ b/includes/model/AngelType_model.php
@@ -77,20 +77,15 @@ function AngelType_contact_info($angeltype)
  * Delete an Angeltype.
  *
  * @param array $angeltype
- * @return bool
  */
 function AngelType_delete($angeltype)
 {
-    $result = DB::delete('
+    DB::delete('
       DELETE FROM `AngelTypes`
       WHERE `id`=?
       LIMIT 1
     ', [$angeltype['id']]);
-    if (is_null($result)) {
-        engelsystem_error('Unable to delete angeltype.');
-    }
     engelsystem_log('Deleted angeltype: ' . AngelType_name_render($angeltype));
-    return true;
 }
 
 /**
diff --git a/includes/model/NeededAngelTypes_model.php b/includes/model/NeededAngelTypes_model.php
index e77c715f..981c100a 100644
--- a/includes/model/NeededAngelTypes_model.php
+++ b/includes/model/NeededAngelTypes_model.php
@@ -35,22 +35,20 @@ function NeededAngelType_add($shift_id, $angeltype_id, $room_id, $count)
  * Deletes all needed angel types from given shift.
  *
  * @param int $shift_id id of the shift
- * @return int count of affected rows
  */
 function NeededAngelTypes_delete_by_shift($shift_id)
 {
-    return (int)DB::delete('DELETE FROM `NeededAngelTypes` WHERE `shift_id` = ?', [$shift_id]);
+    DB::delete('DELETE FROM `NeededAngelTypes` WHERE `shift_id` = ?', [$shift_id]);
 }
 
 /**
  * Deletes all needed angel types from given room.
  *
  * @param int $room_id id of the room
- * @return int count of affected rows
  */
 function NeededAngelTypes_delete_by_room($room_id)
 {
-    return (int)DB::delete(
+    DB::delete(
         'DELETE FROM `NeededAngelTypes` WHERE `room_id` = ?',
         [$room_id]
     );
diff --git a/includes/model/Room_model.php b/includes/model/Room_model.php
index fdd9dddc..d76e6036 100644
--- a/includes/model/Room_model.php
+++ b/includes/model/Room_model.php
@@ -17,11 +17,10 @@ function Rooms($show_all = false)
  * Delete a room
  *
  * @param int $room_id
- * @return bool
  */
 function Room_delete($room_id)
 {
-    return DB::delete('DELETE FROM `Room` WHERE `RID` = ?', [$room_id]);
+    DB::delete('DELETE FROM `Room` WHERE `RID` = ?', [$room_id]);
 }
 
 /**
diff --git a/includes/model/ShiftEntry_model.php b/includes/model/ShiftEntry_model.php
index 3a282efc..bca63774 100644
--- a/includes/model/ShiftEntry_model.php
+++ b/includes/model/ShiftEntry_model.php
@@ -143,13 +143,12 @@ function ShiftEntry($shift_entry_id)
  * Delete a shift entry.
  *
  * @param int $shift_entry_id
- * @return bool
  */
 function ShiftEntry_delete($shift_entry_id)
 {
     $shift_entry = ShiftEntry($shift_entry_id);
     mail_shift_removed(User($shift_entry['UID']), Shift($shift_entry['SID']));
-    return DB::delete('DELETE FROM `ShiftEntry` WHERE `id` = ?', [$shift_entry_id]);
+    DB::delete('DELETE FROM `ShiftEntry` WHERE `id` = ?', [$shift_entry_id]);
 }
 
 /**
diff --git a/includes/model/ShiftTypes_model.php b/includes/model/ShiftTypes_model.php
index 12fe38be..d6efe117 100644
--- a/includes/model/ShiftTypes_model.php
+++ b/includes/model/ShiftTypes_model.php
@@ -6,11 +6,10 @@ use Engelsystem\Database\DB;
  * Delete a shift type.
  *
  * @param int $shifttype_id
- * @return bool
  */
 function ShiftType_delete($shifttype_id)
 {
-    return DB::delete('DELETE FROM `ShiftTypes` WHERE `id`=?', [$shifttype_id]);
+    DB::delete('DELETE FROM `ShiftTypes` WHERE `id`=?', [$shifttype_id]);
 }
 
 /**
diff --git a/includes/model/Shifts_model.php b/includes/model/Shifts_model.php
index 6e69fe35..2288e3cc 100644
--- a/includes/model/Shifts_model.php
+++ b/includes/model/Shifts_model.php
@@ -402,34 +402,22 @@ function Shift_signup_allowed(
  * Delete a shift by its external id.
  *
  * @param int $shift_psid
- * @return bool
  */
 function Shift_delete_by_psid($shift_psid)
 {
     DB::delete('DELETE FROM `Shifts` WHERE `PSID`=?', [$shift_psid]);
-
-    if (DB::getStm()->errorCode() != '00000') {
-        return false;
-    }
-
-    return true;
 }
 
 /**
  * Delete a shift.
  *
  * @param int $shift_id
- * @return bool
  */
 function Shift_delete($shift_id)
 {
     mail_shift_delete(Shift($shift_id));
 
-    $result = DB::delete('DELETE FROM `Shifts` WHERE `SID`=?', [$shift_id]);
-    if (DB::getStm()->errorCode() != '00000') {
-        engelsystem_error('Unable to delete shift.');
-    }
-    return $result;
+    DB::delete('DELETE FROM `Shifts` WHERE `SID`=?', [$shift_id]);
 }
 
 /**
diff --git a/includes/model/UserAngelTypes_model.php b/includes/model/UserAngelTypes_model.php
index f8277fd9..43bd23bc 100644
--- a/includes/model/UserAngelTypes_model.php
+++ b/includes/model/UserAngelTypes_model.php
@@ -125,7 +125,6 @@ function UserAngelType_update($user_angeltype_id, $supporter)
  * Delete all unconfirmed UserAngelTypes for given Angeltype.
  *
  * @param int $angeltype_id
- * @return bool
  */
 function UserAngelTypes_delete_all($angeltype_id)
 {
@@ -134,12 +133,6 @@ function UserAngelTypes_delete_all($angeltype_id)
       WHERE `angeltype_id`=?
       AND `confirm_user_id` IS NULL
     ', [$angeltype_id]);
-
-    if (DB::getStm()->errorCode() != '00000') {
-        engelsystem_error('Unable to delete all unconfirmed users.');
-    }
-
-    return true;
 }
 
 /**
@@ -178,11 +171,10 @@ function UserAngelType_confirm($user_angeltype_id, $confirm_user)
  * Delete an UserAngelType.
  *
  * @param array $user_angeltype
- * @return bool
  */
 function UserAngelType_delete($user_angeltype)
 {
-    return (bool)DB::delete('
+    DB::delete('
       DELETE FROM `UserAngelTypes`
       WHERE `id`=?
       LIMIT 1', [$user_angeltype['id']]);
diff --git a/includes/model/UserDriverLicenses_model.php b/includes/model/UserDriverLicenses_model.php
index ee93ac95..bc9b6516 100644
--- a/includes/model/UserDriverLicenses_model.php
+++ b/includes/model/UserDriverLicenses_model.php
@@ -132,13 +132,8 @@ function UserDriverLicenses_update($user_driver_license)
  * Delete a user's driver license entry
  *
  * @param int $user_id
- * @return bool
  */
 function UserDriverLicenses_delete($user_id)
 {
-    $result = DB::delete('DELETE FROM `UserDriverLicenses` WHERE `user_id`=?', [$user_id]);
-    if (DB::getStm()->errorCode() != '00000') {
-        engelsystem_error('Unable to remove user driver license information');
-    }
-    return $result;
+    DB::delete('DELETE FROM `UserDriverLicenses` WHERE `user_id`=?', [$user_id]);
 }
diff --git a/includes/model/User_model.php b/includes/model/User_model.php
index 9f767b74..adf81393 100644
--- a/includes/model/User_model.php
+++ b/includes/model/User_model.php
@@ -11,13 +11,10 @@ use Engelsystem\ValidationResult;
  * Delete a user
  *
  * @param int $user_id
- * @return bool
  */
 function User_delete($user_id)
 {
     DB::delete('DELETE FROM `User` WHERE `UID`=?', [$user_id]);
-
-    return DB::getStm()->errorCode() == '00000';
 }
 
 /**
diff --git a/includes/pages/admin_import.php b/includes/pages/admin_import.php
index 959a9d2e..506a9dbe 100644
--- a/includes/pages/admin_import.php
+++ b/includes/pages/admin_import.php
@@ -279,10 +279,7 @@ function admin_import()
             }
 
             foreach ($events_deleted as $event) {
-                $result = Shift_delete_by_psid($event['PSID']);
-                if ($result === false) {
-                    engelsystem_error('Unable to delete shift.');
-                }
+                Shift_delete_by_psid($event['PSID']);
             }
 
             engelsystem_log('Frab import done');
diff --git a/includes/pages/admin_rooms.php b/includes/pages/admin_rooms.php
index ad8eab83..d49db707 100644
--- a/includes/pages/admin_rooms.php
+++ b/includes/pages/admin_rooms.php
@@ -209,9 +209,7 @@ function admin_rooms()
             ]);
         } elseif ($request->input('show') == 'delete') {
             if ($request->has('ack')) {
-                if (!Room_delete($room_id)) {
-                    engelsystem_error('Unable to delete room.');
-                }
+                Room_delete($room_id);
 
                 engelsystem_log('Room deleted: ' . $name);
                 success(sprintf(_('Room %s deleted.'), $name));
diff --git a/includes/pages/user_myshifts.php b/includes/pages/user_myshifts.php
index 94116fc9..a10e6f82 100644
--- a/includes/pages/user_myshifts.php
+++ b/includes/pages/user_myshifts.php
@@ -145,10 +145,8 @@ function user_myshifts()
                 ($shift['start'] > time() + config('last_unsubscribe') * 3600)
                 || in_array('user_shifts_admin', $privileges)
             ) {
-                $result = ShiftEntry_delete($user_id);
-                if ($result === false) {
-                    engelsystem_error('Unable to delete shift entry.');
-                }
+                ShiftEntry_delete($user_id);
+
                 $room = Room($shift['RID']);
                 $angeltype = AngelType($shift['TID']);
                 $shifttype = ShiftType($shift['shifttype_id']);
diff --git a/src/Database/Db.php b/src/Database/Db.php
index 46edc96b..b433f40d 100644
--- a/src/Database/Db.php
+++ b/src/Database/Db.php
@@ -113,13 +113,13 @@ class Db
      *
      * @param string $query
      * @param array  $bindings
-     * @return int|bool
+     * @return int
      */
     public static function delete($query, array $bindings = [])
     {
         self::query($query, $bindings);
 
-        return (self::$lastStatus ? self::$stm->rowCount() : false);
+        return self::$stm->rowCount();
     }
 
     /**