From 27a84759b18ae1ffe0597147b9f18eecb291461f Mon Sep 17 00:00:00 2001
From: Frank Elsinga <frank@elsinga.de>
Date: Tue, 13 Jan 2026 01:55:22 +0100
Subject: [PATCH] reduce the cost to store the respnoses by lowering the limit
 and changing to brotli

---
 .../2025-10-15-0001-add-monitor-response-config.js          | 2 +-
 server/model/heartbeat.js                                   | 6 +++---
 server/model/monitor.js                                     | 6 +++---
 src/pages/EditMonitor.vue                                   | 2 +-
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/db/knex_migrations/2025-10-15-0001-add-monitor-response-config.js b/db/knex_migrations/2025-10-15-0001-add-monitor-response-config.js
index d1f4ccf09..589e8aefc 100644
--- a/db/knex_migrations/2025-10-15-0001-add-monitor-response-config.js
+++ b/db/knex_migrations/2025-10-15-0001-add-monitor-response-config.js
@@ -2,7 +2,7 @@ exports.up = function (knex) {
     return knex.schema.alterTable("monitor", function (table) {
         table.boolean("save_response").notNullable().defaultTo(false);
         table.boolean("save_error_response").notNullable().defaultTo(true);
-        table.integer("response_max_length").notNullable().defaultTo(10240); // Default 10KB
+        table.integer("response_max_length").notNullable().defaultTo(256); // Default 256B
     });
 };
 
diff --git a/server/model/heartbeat.js b/server/model/heartbeat.js
index 19dbd4a6a..3b2c75a25 100644
--- a/server/model/heartbeat.js
+++ b/server/model/heartbeat.js
@@ -1,7 +1,7 @@
 const { BeanModel } = require("redbean-node/dist/bean-model");
 const zlib = require("node:zlib");
 const { promisify } = require("node:util");
-const gunzip = promisify(zlib.gunzip);
+const brotliDecompress = promisify(zlib.brotliDecompress);
 
 /**
  * status:
@@ -73,8 +73,8 @@ class Heartbeat extends BeanModel {
         }
 
         try {
-            // Offload gzip decode from main event loop to libuv thread pool
-            return (await gunzip(Buffer.from(response, "base64"))).toString("utf8");
+            // Offload brotli decode from main event loop to libuv thread pool
+            return (await brotliDecompress(Buffer.from(response, "base64"))).toString("utf8");
         } catch (error) {
             return response;
         }
diff --git a/server/model/monitor.js b/server/model/monitor.js
index 50fdb2a2e..01d655f23 100644
--- a/server/model/monitor.js
+++ b/server/model/monitor.js
@@ -60,7 +60,7 @@ const https = require("https");
 const http = require("http");
 const zlib = require("node:zlib");
 const { promisify } = require("node:util");
-const gzip = promisify(zlib.gzip);
+const brotliCompress = promisify(zlib.brotliCompress);
 const DomainExpiry = require("./domain_expiry");
 
 const rootCertificates = rootCertificatesFingerprints();
@@ -1174,8 +1174,8 @@ class Monitor extends BeanModel {
             responseData = responseData.substring(0, maxSize) + "... (truncated)";
         }
 
-        // Offload gzip compression from main event loop to libuv thread pool
-        bean.response = (await gzip(Buffer.from(responseData, "utf8"))).toString("base64");
+        // Offload brotli compression from main event loop to libuv thread pool
+        bean.response = (await brotliCompress(Buffer.from(responseData, "utf8"))).toString("base64");
     }
 
     /**
diff --git a/src/pages/EditMonitor.vue b/src/pages/EditMonitor.vue
index b3d09d1b4..c629dca0f 100644
--- a/src/pages/EditMonitor.vue
+++ b/src/pages/EditMonitor.vue
@@ -2269,7 +2269,7 @@ const monitorDefaults = {
     accepted_statuscodes: ["200-299"],
     saveResponse: false,
     saveErrorResponse: true,
-    responseMaxLength: 10240,
+    responseMaxLength: 256,
     dns_resolve_type: "A",
     dns_resolve_server: "1.1.1.1",
     docker_container: "",