diff --git a/source/structure/r1.sindri.json b/source/structure/r1.sindri.json
index 84d5d69..5d338e8 100644
--- a/source/structure/r1.sindri.json
+++ b/source/structure/r1.sindri.json
@@ -1,5 +1,28 @@
 {
 	"domains": [
+		{
+			"name": "sessions",
+			"data_fields": [
+				{
+					"name": "key",
+					"type": "string_medium",
+					"nullable": false
+				},
+				{
+					"name": "data",
+					"type": "string_long",
+					"nullable": false
+				}
+			],
+			"constraints": [
+				{
+					"kind": "unique",
+					"parameters": {
+						"fields": ["key"]
+					}
+				}
+			]
+		},
 		{
 			"name": "members",
 			"key_field": {