add low-resource ch overrides to compose setup

hosting/docker/clickhouse/override.xml

@@ -1,21 +1,20 @@
 <clickhouse>
     <logger>
-        <!-- Possible levels [1]:
-
-          - none (turns off logging)
-          - fatal
-          - critical
-          - error
-          - warning
-          - notice
-          - information
-          - debug
-          - trace
-          - test (not for production usage)
-
-            [1]: https://github.com/pocoproject/poco/blob/poco-1.9.4-release/Foundation/include/Poco/Logger.h#L105-L114
+        <!--
+            Possible levels: ["none", "fatal", "critical", "error", "warning", "notice", "information", "debug", "trace", "test"]
+            See: https://github.com/pocoproject/poco/blob/poco-1.9.4-release/Foundation/include/Poco/Logger.h#L105-L114
         -->
         <level>warning</level>
     </logger>
-    <!-- Add other overrides here as needed -->
+    <!-- Official recommendations for systems with <16GB RAM -->
+    <mark_cache_size>524288000</mark_cache_size> <!-- 500MB -->
+    <concurrent_threads_soft_limit_num>1</concurrent_threads_soft_limit_num>
+    <profiles>
+        <default>
+        <max_block_size>8192</max_block_size>
+        <max_download_threads>1</max_download_threads>
+        <input_format_parallel_parsing>0</input_format_parallel_parsing>
+        <output_format_parallel_formatting>0</output_format_parallel_formatting>
+        </default>
+    </profiles>
 </clickhouse>