The DriverManager-based approach likely failed because the ClickHouse JDBC driver wasn't registered with DriverManager. The original JdbcTemplate approach worked for route_diagrams and agent_metrics — only route_executions was skipped due to the comment-parsing bug. Reverts to simple JdbcTemplate-based init with unqualified table names (DataSource targets cameleer3 database). The CLICKHOUSE_DB env var on the ClickHouse container handles database creation. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>