diff --git a/app/Models/Concerns/NotificationContext.php b/app/Models/Concerns/NotificationContext.php
new file mode 100644
index 0000000..ba93dd7
--- /dev/null
+++ b/app/Models/Concerns/NotificationContext.php
@@ -0,0 +1,29 @@
+<?php
+
+
+namespace App\Models\Concerns;
+
+
+use App\Models\ContentReport;
+use App\Models\Notification;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
+
+trait NotificationContext
+{
+    public function bootNotificationContext()
+    {
+        static::deleting(function(NotificationContext $self) {
+            $self->notificationsAbout()->delete();
+        });
+    }
+
+    /**
+     * Notifications having this model as a context
+     *
+     * @return MorphMany
+     */
+    public function notificationsAbout()
+    {
+        return $this->morphMany(Notification::class, 'context');
+    }
+}
diff --git a/app/Models/Concerns/Reportable.php b/app/Models/Concerns/Reportable.php
new file mode 100644
index 0000000..cc84c2d
--- /dev/null
+++ b/app/Models/Concerns/Reportable.php
@@ -0,0 +1,28 @@
+<?php
+
+
+namespace App\Models\Concerns;
+
+
+use App\Models\ContentReport;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
+
+trait Reportable
+{
+    public function bootReportable()
+    {
+        static::deleting(function(Reportable $self) {
+            $self->reportsOf()->delete();
+        });
+    }
+
+    /**
+     * Reports of this user
+     *
+     * @return MorphMany
+     */
+    public function reportsOf()
+    {
+        return $this->morphMany(ContentReport::class, 'object');
+    }
+}
diff --git a/app/Models/Proposal.php b/app/Models/Proposal.php
index 4f99837..bbcd675 100644
--- a/app/Models/Proposal.php
+++ b/app/Models/Proposal.php
@@ -2,13 +2,33 @@
 
 namespace App\Models;
 
+use App\Models\Concerns\NotificationContext;
+use App\Models\Concerns\Reportable;
+use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\Model;
 
 /**
  * Change proposal
+ *
+ * @property Row[]|Collection $addedRows
+ * @property Row[]|Collection $removedRows
  */
 class Proposal extends Model
 {
+    use Reportable;
+    use NotificationContext;
+
+    protected static function boot()
+    {
+        parent::boot();
+
+        static::deleting(function(Proposal $self) {
+            // update refcounts
+            $self->addedRows()->decrement('refs');
+            $self->removedRows()->decrement('refs');
+        });
+    }
+
     /** Added rows */
     public function addedRows()
     {
diff --git a/app/Models/Revision.php b/app/Models/Revision.php
index d1c1a8e..c3290ff 100644
--- a/app/Models/Revision.php
+++ b/app/Models/Revision.php
@@ -12,6 +12,16 @@ class Revision extends Model
 {
     use HasRelaquentRelationships;
 
+    protected static function boot()
+    {
+        parent::boot();
+
+        static::deleting(function(Revision $self) {
+            // update refcounts
+            $self->rows()->decrement('refs');
+        });
+    }
+
     /** Included rows */
     public function rows()
     {
diff --git a/app/Models/Table.php b/app/Models/Table.php
index 405711a..9d14e38 100644
--- a/app/Models/Table.php
+++ b/app/Models/Table.php
@@ -2,6 +2,8 @@
 
 namespace App\Models;
 
+use App\Models\Concerns\NotificationContext;
+use App\Models\Concerns\Reportable;
 use Illuminate\Database\Eloquent\Model;
 
 /**
@@ -9,6 +11,19 @@ use Illuminate\Database\Eloquent\Model;
  */
 class Table extends Model
 {
+    use Reportable;
+    use NotificationContext;
+
+    protected static function boot()
+    {
+        parent::boot();
+
+        static::deleting(function(Table $self) {
+            // update refcounts
+            $self->revisions()->decrement('refs');
+        });
+    }
+
     /** Owning user */
     public function owner()
     {
diff --git a/app/Models/TableComment.php b/app/Models/TableComment.php
index 255679d..e5c3d16 100644
--- a/app/Models/TableComment.php
+++ b/app/Models/TableComment.php
@@ -2,6 +2,8 @@
 
 namespace App\Models;
 
+use App\Models\Concerns\NotificationContext;
+use App\Models\Concerns\Reportable;
 use Illuminate\Database\Eloquent\Model;
 
 /**
@@ -9,6 +11,9 @@ use Illuminate\Database\Eloquent\Model;
  */
 class TableComment extends Model
 {
+    use Reportable;
+    use NotificationContext;
+
     /** Context data table */
     public function table()
     {
diff --git a/app/Models/User.php b/app/Models/User.php
index 89b6cfe..ec73522 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -3,14 +3,21 @@
 namespace App\Models;
 
 use AdamWathan\EloquentOAuth\OAuthIdentity;
+use App\Models\Concerns\Reportable;
+use Illuminate\Database\Eloquent\Collection;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphMany;
 use Illuminate\Notifications\Notifiable;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 
 /**
  * A user in the application
+ *
+ * @property Proposal[]|Collection $proposals
  */
 class User extends Authenticatable
 {
+    use Reportable;
     use Notifiable;
 
     /**
@@ -31,6 +38,20 @@ class User extends Authenticatable
         'password', 'remember_token',
     ];
 
+    protected static function boot()
+    {
+        parent::boot();
+
+        static::deleting(function(User $self) {
+            // manually delete proposals to ensure row refcounts are updated
+            foreach ($self->proposals as $proposal) {
+                $proposal->delete();
+            }
+
+            $self->notificationsCaused()->delete();
+        });
+    }
+
     /** Owned tables */
     public function dataTables()
     {
@@ -78,4 +99,14 @@ class User extends Authenticatable
     {
         return $this->hasMany(Notification::class);
     }
+
+    /**
+     * Notifications caused by this user
+     *
+     * @return HasMany
+     */
+    public function notificationsCaused()
+    {
+        return $this->hasMany(Notification::class, 'actor_id');
+    }
 }