diff --git a/keyserver/src/database/migration-config.js b/keyserver/src/database/migration-config.js
--- a/keyserver/src/database/migration-config.js
+++ b/keyserver/src/database/migration-config.js
@@ -205,6 +205,17 @@
   ],
   [18, updateRolesAndPermissionsForAllThreads],
   [19, updateRolesAndPermissionsForAllThreads],
+  [
+    20,
+    async () => {
+      await dbQuery(SQL`
+        ALTER TABLE threads
+          ADD COLUMN IF NOT EXISTS avatar varchar(191)
+            COLLATE utf8mb4_bin
+            DEFAULT NULL;
+      `);
+    },
+  ],
 ]);
 const newDatabaseVersion: number = Math.max(...migrations.keys());
 
diff --git a/keyserver/src/database/setup-db.js b/keyserver/src/database/setup-db.js
--- a/keyserver/src/database/setup-db.js
+++ b/keyserver/src/database/setup-db.js
@@ -154,7 +154,8 @@
         creation_time bigint(20) NOT NULL,
         color char(6) COLLATE utf8mb4_bin NOT NULL,
         source_message bigint(20) DEFAULT NULL UNIQUE,
-        replies_count int UNSIGNED NOT NULL DEFAULT 0
+        replies_count int UNSIGNED NOT NULL DEFAULT 0,
+        avatar varchar(191) COLLATE utf8mb4_bin DEFAULT NULL
       ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;
 
       CREATE TABLE updates (