From e46d66bf267d7e859f137ea3dd72b205d53f0f6a Mon Sep 17 00:00:00 2001
From: Ralf Kistner <ralf@journeyapps.com>
Date: Wed, 12 Nov 2025 15:04:19 +0200
Subject: [PATCH 1/2] Fix liveness probe when no connections are defined.

---
 .../src/replication/ReplicationEngine.ts        | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/packages/service-core/src/replication/ReplicationEngine.ts b/packages/service-core/src/replication/ReplicationEngine.ts
index 3ae7849d8..9ef584e18 100644
--- a/packages/service-core/src/replication/ReplicationEngine.ts
+++ b/packages/service-core/src/replication/ReplicationEngine.ts
@@ -1,9 +1,10 @@
-import { logger } from '@powersync/lib-services-framework';
+import { container, logger } from '@powersync/lib-services-framework';
 import { AbstractReplicator } from './AbstractReplicator.js';
 import { ConnectionTestResult } from './ReplicationModule.js';
 
 export class ReplicationEngine {
   private readonly replicators: Map<string, AbstractReplicator> = new Map();
+  private probeInterval: NodeJS.Timeout | null = null;
 
   /**
    *  Register a Replicator with the engine
@@ -27,6 +28,17 @@ export class ReplicationEngine {
       logger.info(`Starting Replicator: ${replicator.id}`);
       replicator.start();
     }
+    if (this.replicators.size == 0) {
+      // If a replicator is running, the replicators update the probes.
+      // If no connections are configured, then no replicator is running
+      // Typical when no connections are configured.
+      // In this case, update the probe here to avoid liveness probe failures.
+      this.probeInterval = setInterval(() => {
+        container.probes.touch().catch((e) => {
+          logger.error(`Failed to touch probe`, e);
+        });
+      }, 5_000);
+    }
     logger.info('Successfully started Replication Engine.');
   }
 
@@ -39,6 +51,9 @@ export class ReplicationEngine {
       logger.info(`Stopping Replicator: ${replicator.id}`);
       await replicator.stop();
     }
+    if (this.probeInterval) {
+      clearInterval(this.probeInterval);
+    }
     logger.info('Successfully shut down Replication Engine.');
   }
 

From 898c5936186c4af3e25973ad4d9629ef97b43c19 Mon Sep 17 00:00:00 2001
From: Ralf Kistner <ralf@journeyapps.com>
Date: Wed, 12 Nov 2025 15:04:48 +0200
Subject: [PATCH 2/2] Add changeset.

---
 .changeset/orange-forks-eat.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/orange-forks-eat.md

diff --git a/.changeset/orange-forks-eat.md b/.changeset/orange-forks-eat.md
new file mode 100644
index 000000000..b25796e37
--- /dev/null
+++ b/.changeset/orange-forks-eat.md
@@ -0,0 +1,5 @@
+---
+'@powersync/service-core': patch
+---
+
+Fix liveness probe when no connections are defined.