From 88da1a0dd8b21c41ec4586b469e77505b6112d1d Mon Sep 17 00:00:00 2001
From: hsiegeln <37154749+hsiegeln@users.noreply.github.com>
Date: Fri, 13 Mar 2026 09:55:46 +0100
Subject: [PATCH] Fix ClickHouse OOM during Proxmox nightly backups

Increase ClickHouse memory limit from 1Gi to 2Gi and reduce default
batch size from 5000 to 500. During VM backup snapshots, I/O contention
prevents ClickHouse from flushing writes fast enough, causing buffer
accumulation that exceeds the 1Gi container limit.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---
 .../java/com/cameleer3/server/app/config/IngestionConfig.java   | 2 +-
 deploy/clickhouse.yaml                                          | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/IngestionConfig.java b/cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/IngestionConfig.java
index 340bcc94..762b0e39 100644
--- a/cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/IngestionConfig.java
+++ b/cameleer3-server-app/src/main/java/com/cameleer3/server/app/config/IngestionConfig.java
@@ -12,7 +12,7 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
 public class IngestionConfig {
 
     private int bufferCapacity = 50_000;
-    private int batchSize = 5_000;
+    private int batchSize = 500;
     private long flushIntervalMs = 1_000;
 
     public int getBufferCapacity() {
diff --git a/deploy/clickhouse.yaml b/deploy/clickhouse.yaml
index 4992f8ad..2e73c791 100644
--- a/deploy/clickhouse.yaml
+++ b/deploy/clickhouse.yaml
@@ -37,7 +37,7 @@ spec:
               memory: "512Mi"
               cpu: "200m"
             limits:
-              memory: "1Gi"
+              memory: "2Gi"
               cpu: "1000m"
   volumeClaimTemplates:
     - metadata: