refactor(go): simplify identity table keys

go/vehicle-gateway/internal/identity/resolver.go

@@ -71,17 +71,14 @@ func identityBindingTableSQL(table string) string {
 		table = "vehicle_identity_binding"
 	}
 	return `CREATE TABLE IF NOT EXISTS ` + table + ` (
-  id BIGINT PRIMARY KEY AUTO_INCREMENT,
-  vin VARCHAR(32) NOT NULL,
+  vin VARCHAR(32) PRIMARY KEY,
   plate VARCHAR(32) NULL,
   phone VARCHAR(32) NULL,
   device_id VARCHAR(64) NULL,
-  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
   updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   UNIQUE KEY uk_identity_plate (plate),
   UNIQUE KEY uk_identity_phone (phone),
-  UNIQUE KEY uk_identity_device (device_id),
-  KEY idx_identity_vin (vin)
+  UNIQUE KEY uk_identity_device (device_id)
 )`
 }
 
@@ -103,7 +100,6 @@ const jt808RegistrationTableSQL = `CREATE TABLE IF NOT EXISTS jt808_registration
   latest_registered_at DATETIME NULL,
   latest_authenticated_at DATETIME NULL,
   latest_seen_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
-  created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
   updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   KEY idx_jt808_registration_device (device_id),
   KEY idx_jt808_registration_plate (plate),