feat: backend changes for dynamic secret

backend/src/db/migrations/20250527140639_dynamic-secret-username-template.ts

@@ -0,0 +1,21 @@
+import { Knex } from "knex";
+
+import { TableName } from "../schemas";
+
+export async function up(knex: Knex): Promise<void> {
+  const hasColumn = await knex.schema.hasColumn(TableName.DynamicSecret, "usernameTemplate");
+  if (!hasColumn) {
+    await knex.schema.alterTable(TableName.DynamicSecret, (t) => {
+      t.string("usernameTemplate").nullable();
+    });
+  }
+}
+
+export async function down(knex: Knex): Promise<void> {
+  const hasColumn = await knex.schema.hasColumn(TableName.DynamicSecret, "usernameTemplate");
+  if (hasColumn) {
+    await knex.schema.alterTable(TableName.DynamicSecret, (t) => {
+      t.dropColumn("usernameTemplate");
+    });
+  }
+}

backend/src/db/schemas/dynamic-secrets.ts

@@ -28,7 +28,8 @@ export const DynamicSecretsSchema = z.object({
   updatedAt: z.date(),
   encryptedInput: zodBuffer,
   projectGatewayId: z.string().uuid().nullable().optional(),
-  gatewayId: z.string().uuid().nullable().optional()
+  gatewayId: z.string().uuid().nullable().optional(),
+  usernameTemplate: z.string().nullable().optional()
 });
 
 export type TDynamicSecrets = z.infer<typeof DynamicSecretsSchema>;