diff --git a/app/models/post.rb b/app/models/post.rb
index 7aa9155264..736295205c 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -61,6 +61,7 @@ class Post < ActiveRecord::Base
   belongs_to :image_upload, class_name: "Upload"
 
   has_many :post_hotlinked_media, dependent: :destroy, class_name: "PostHotlinkedMedia"
+  has_many :reviewables, as: :target, dependent: :destroy
 
   validates_with PostValidator, unless: :skip_validation
 
diff --git a/db/post_migrate/20230119091939_drop_orphaned_reviewable_flagged_posts.rb b/db/post_migrate/20230119091939_drop_orphaned_reviewable_flagged_posts.rb
new file mode 100644
index 0000000000..3efe3c0688
--- /dev/null
+++ b/db/post_migrate/20230119091939_drop_orphaned_reviewable_flagged_posts.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class DropOrphanedReviewableFlaggedPosts < ActiveRecord::Migration[7.0]
+  def up
+    DB.exec(<<~SQL)
+      DELETE FROM reviewables
+      WHERE reviewables.type = 'ReviewableFlaggedPost'
+        AND reviewables.status = 0
+        AND reviewables.target_type = 'Post'
+        AND NOT EXISTS(SELECT 1 FROM posts WHERE posts.id = reviewables.target_id)
+    SQL
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end
diff --git a/spec/models/post_spec.rb b/spec/models/post_spec.rb
index deb5e637f9..7fdb40fbaa 100644
--- a/spec/models/post_spec.rb
+++ b/spec/models/post_spec.rb
@@ -3,9 +3,11 @@
 RSpec.describe Post do
   fab!(:coding_horror) { Fabricate(:coding_horror) }
 
+  let(:upload_path) { Discourse.store.upload_path }
+
   before { Oneboxer.stubs :onebox }
 
-  let(:upload_path) { Discourse.store.upload_path }
+  it { is_expected.to have_many(:reviewables).dependent(:destroy) }
 
   describe "#hidden_reasons" do
     context "when verifying enum sequence" do