Archived
Add initial schema changeset with CREATE TABLE statements for all 15 domain entities, ordered by foreign key dependencies. Update changelog.yaml to reference the new changeset file. Extend ConciliumMetaDataProvider with PostgreSQL backend support that activates when RDBMS_VENDOR=postgresql is set, reading connection parameters from environment variables. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>