diff --git a/packages/api/src/schema.ts b/packages/api/src/schema.ts
index c198b7f13..254d1a076 100755
--- a/packages/api/src/schema.ts
+++ b/packages/api/src/schema.ts
@@ -1614,6 +1614,7 @@ const schema = gql`
   enum CreateWebhookErrorCode {
     UNAUTHORIZED
     BAD_REQUEST
+    ALREADY_EXISTS
   }
 
   # Mutations
diff --git a/packages/db/migrations/0083.do.webhooks.sql b/packages/db/migrations/0083.do.webhooks.sql
index aa044413b..018762b74 100755
--- a/packages/db/migrations/0083.do.webhooks.sql
+++ b/packages/db/migrations/0083.do.webhooks.sql
@@ -6,13 +6,15 @@ BEGIN;
 
 CREATE TABLE omnivore.webhooks (
     id uuid PRIMARY KEY DEFAULT uuid_generate_v1mc(),
+    user_id uuid NOT NULL REFERENCES omnivore.user ON DELETE CASCADE,
     url text NOT NULL,
     method text NOT NULL DEFAULT 'POST',
     content_type text NOT NULL DEFAULT 'application/json',
     active boolean NOT NULL DEFAULT true,
     event_types text[] NOT NULL,
     created_at timestamptz NOT NULL DEFAULT current_timestamp,
-    updated_at timestamptz NOT NULL DEFAULT current_timestamp
+    updated_at timestamptz NOT NULL DEFAULT current_timestamp,
+    UNIQUE (user_id, event_types)
 );
 
 CREATE TRIGGER update_webhook_modtime BEFORE UPDATE ON omnivore.webhooks