diff --git a/db.sql b/db.sql
index 42af2911..928180f0 100644
--- a/db.sql
+++ b/db.sql
@@ -1324,7 +1324,8 @@ CREATE TABLE `invoices` (
   `invoice_category_id` int(11) NOT NULL,
   `invoice_recurring_invoice_id` int(11) NOT NULL DEFAULT 0,
   `invoice_client_id` int(11) NOT NULL,
-  PRIMARY KEY (`invoice_id`)
+  PRIMARY KEY (`invoice_id`),
+  UNIQUE KEY `invoice_number` (`invoice_number`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
 /*!40101 SET character_set_client = @saved_cs_client */;
 
@@ -1677,7 +1678,8 @@ CREATE TABLE `quotes` (
   `quote_archived_at` datetime DEFAULT NULL,
   `quote_category_id` int(11) NOT NULL,
   `quote_client_id` int(11) NOT NULL,
-  PRIMARY KEY (`quote_id`)
+  PRIMARY KEY (`quote_id`),
+  UNIQUE KEY `quote_number` (`quote_number`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
 /*!40101 SET character_set_client = @saved_cs_client */;
 
@@ -2644,7 +2646,8 @@ CREATE TABLE `tickets` (
   `ticket_project_id` int(11) NOT NULL DEFAULT 0,
   `ticket_recurring_ticket_id` int(11) DEFAULT 0,
   `ticket_order` int(11) NOT NULL DEFAULT 0,
-  PRIMARY KEY (`ticket_id`)
+  PRIMARY KEY (`ticket_id`),
+  UNIQUE KEY `ticket_number` (`ticket_number`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
 /*!40101 SET character_set_client = @saved_cs_client */;