fix: ClickHouse insertion using native clickhouse-go/v2 API

- Replace database/sql wrapper with clickhouse.Open() and clickhouse.Conn
- Use PrepareBatch + Append + Send pattern for proper batch inserts
- Fix ATTEMPT_TO_READ_AFTER_EOF errors caused by empty VALUES
- Add batch size logging for debugging
- Update version to 1.1.5

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packaging/rpm/logcorrelator.spec

@@ -2,7 +2,7 @@
 # Compatible with CentOS 7, Rocky Linux 8, 9, 10
 
 # Define version before Version: field for RPM macro support
-%global spec_version 1.1.4
+%global spec_version 1.1.5
 
 Name:           logcorrelator
 Version:        %{spec_version}
@@ -121,7 +121,10 @@ fi
 /etc/logrotate.d/logcorrelator
 
 %changelog
-* Mon Mar 02 2026 logcorrelator <dev@example.com> - 1.1.5-1
+* Tue Mar 03 2026 logcorrelator <dev@example.com> - 1.1.5-1
+- Fix: ClickHouse insertion using native clickhouse-go/v2 API (PrepareBatch + Append + Send)
+- Fix: Replaced database/sql wrapper with clickhouse.Open() and clickhouse.Conn
+- Fix: Proper batch sending to avoid ATTEMPT_TO_READ_AFTER_EOF errors
 - Fix: Set correct permissions (755) on /var/run/logcorrelator in RPM post-install
 
 * Mon Mar 02 2026 logcorrelator <dev@example.com> - 1.1.4-1