diff --git a/db/knex_migrations/2025-09-02-0000-add-domain-expiry.js b/db/knex_migrations/2025-09-02-0000-add-domain-expiry.js
index ede2e1889..b204a44d3 100644
--- a/db/knex_migrations/2025-09-02-0000-add-domain-expiry.js
+++ b/db/knex_migrations/2025-09-02-0000-add-domain-expiry.js
@@ -6,7 +6,9 @@ exports.up = function (knex) {
         .createTable("domain_expiry", (table) => {
             table.increments("id");
             table.datetime("last_check");
-            table.text("domain").unique().notNullable();
+            // Use VARCHAR(255) for MySQL/MariaDB compatibility with unique constraint
+            // Maximum domain name length is 253 characters (255 octets on the wire)
+            table.string("domain", 255).unique().notNullable();
             table.datetime("expiry");
             table.integer("last_expiry_notification_sent").defaultTo(null);
         });
diff --git a/db/knex_migrations/2026-01-06-0000-fix-domain-expiry-column-type.js b/db/knex_migrations/2026-01-06-0000-fix-domain-expiry-column-type.js
new file mode 100644
index 000000000..6728c5fb8
--- /dev/null
+++ b/db/knex_migrations/2026-01-06-0000-fix-domain-expiry-column-type.js
@@ -0,0 +1,14 @@
+// Ensure domain column is VARCHAR(255) across all database types.
+// This migration ensures MySQL, SQLite, and MariaDB have consistent column type,
+// even if a user installed 2.1.0-beta.0 or 2.1.0-beta.1 which had TEXT type for this column.
+// Maximum domain name length is 253 characters (255 octets on the wire).
+// Note: The unique constraint is already present from the original migration.
+exports.up = function (knex) {
+    return knex.schema.alterTable("domain_expiry", function (table) {
+        table.string("domain", 255).notNullable().alter();
+    });
+};
+
+exports.down = function (knex) {
+    // No rollback needed - keeping VARCHAR(255) is the correct state
+};