diff --git a/backend/priv/repo/migrations/20190821203820_add_crawl_interaction_on_delete.exs b/backend/priv/repo/migrations/20190821203820_add_crawl_interaction_on_delete.exs
new file mode 100644
index 0000000..b0f999d
--- /dev/null
+++ b/backend/priv/repo/migrations/20190821203820_add_crawl_interaction_on_delete.exs
@@ -0,0 +1,25 @@
+defmodule Backend.Repo.Migrations.AddCrawlInteractionOnDelete do
+  use Ecto.Migration
+
+  def change do
+    execute(
+      "ALTER TABLE crawl_interactions DROP CONSTRAINT crawl_interactions_source_domain_fkey",
+      "ALTER TABLE crawl_interactions ADD CONSTRAINT crawl_interactions_source_domain_fkey FOREIGN KEY (source_domain) REFERENCES instances(domain)"
+    )
+
+    execute(
+      "ALTER TABLE crawl_interactions ADD CONSTRAINT crawl_interactions_source_domain_fkey FOREIGN KEY (source_domain) REFERENCES instances(domain) ON DELETE CASCADE",
+      "ALTER TABLE crawl_interactions DROP CONSTRAINT crawl_interactions_source_domain_fkey"
+    )
+
+    execute(
+      "ALTER TABLE crawl_interactions DROP CONSTRAINT crawl_interactions_target_domain_fkey",
+      "ALTER TABLE crawl_interactions ADD CONSTRAINT crawl_interactions_target_domain_fkey FOREIGN KEY (target_domain) REFERENCES instances(domain)"
+    )
+
+    execute(
+      "ALTER TABLE crawl_interactions ADD CONSTRAINT crawl_interactions_target_domain_fkey FOREIGN KEY (target_domain) REFERENCES instances(domain) ON DELETE CASCADE",
+      "ALTER TABLE crawl_interactions DROP CONSTRAINT crawl_interactions_target_domain_fkey"
+    )
+  end
+end