fix: refactor ClickHouse config to match cameleer3-server pattern

- Add ClickHouseProperties with @ConfigurationProperties
- @ConditionalOnProperty to toggle ClickHouse
- @Primary DataSource + JdbcTemplate for PostgreSQL (prevents Spring
  Boot from routing JPA/Flyway to ClickHouse)
- HikariDataSource for ClickHouse with explicit credentials
- Remove separate DataSourceConfig.java (merged into ClickHouseConfig)
- Remove database-platform override (no longer needed with @Primary)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/main/java/net/siegeln/cameleer/saas/log/ClickHouseConfig.java

@@ -1,23 +1,48 @@
 package net.siegeln.cameleer.saas.log;
 
-import org.springframework.beans.factory.annotation.Value;
+import com.zaxxer.hikari.HikariDataSource;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.context.annotation.Profile;
+import org.springframework.context.annotation.Primary;
+import org.springframework.jdbc.core.JdbcTemplate;
 
-import com.clickhouse.jdbc.ClickHouseDataSource;
-import java.util.Properties;
+import javax.sql.DataSource;
 
 @Configuration
-@Profile("!test")
+@EnableConfigurationProperties(ClickHouseProperties.class)
+@ConditionalOnProperty(name = "cameleer.clickhouse.enabled", havingValue = "true", matchIfMissing = true)
 public class ClickHouseConfig {
 
-    @Value("${cameleer.clickhouse.url:jdbc:clickhouse://clickhouse:8123/cameleer}")
-    private String url;
+    /**
+     * Explicit primary PG DataSource. Required because adding a second DataSource
+     * (ClickHouse) prevents Spring Boot auto-configuration from creating the default one.
+     */
+    @Bean
+    @Primary
+    public DataSource dataSource(DataSourceProperties properties) {
+        return properties.initializeDataSourceBuilder().build();
+    }
+
+    @Bean
+    @Primary
+    public JdbcTemplate jdbcTemplate(@Qualifier("dataSource") DataSource dataSource) {
+        return new JdbcTemplate(dataSource);
+    }
 
     @Bean(name = "clickHouseDataSource")
-    public ClickHouseDataSource clickHouseDataSource() throws Exception {
-        var properties = new Properties();
-        return new ClickHouseDataSource(url, properties);
+    public DataSource clickHouseDataSource(ClickHouseProperties props) {
+        HikariDataSource ds = new HikariDataSource();
+        ds.setJdbcUrl(props.getUrl());
+        ds.setUsername(props.getUsername());
+        ds.setPassword(props.getPassword());
+        ds.setMaximumPoolSize(10);
+        ds.setMinimumIdle(2);
+        ds.setConnectionTimeout(5000);
+        ds.setPoolName("clickhouse-pool");
+        return ds;
     }
 }

src/main/java/net/siegeln/cameleer/saas/log/ClickHouseProperties.java

@@ -0,0 +1,24 @@
+package net.siegeln.cameleer.saas.log;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+@ConfigurationProperties(prefix = "cameleer.clickhouse")
+public class ClickHouseProperties {
+
+    private boolean enabled = true;
+    private String url = "jdbc:clickhouse://clickhouse:8123/cameleer";
+    private String username = "default";
+    private String password = "";
+
+    public boolean isEnabled() { return enabled; }
+    public void setEnabled(boolean enabled) { this.enabled = enabled; }
+
+    public String getUrl() { return url; }
+    public void setUrl(String url) { this.url = url; }
+
+    public String getUsername() { return username; }
+    public void setUsername(String username) { this.username = username; }
+
+    public String getPassword() { return password; }
+    public void setPassword(String password) { this.password = password; }
+}