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docs(brain): update second brain with postgres multi-tenancy ADR

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DanielS
2026-08-19 00:04:50 +02:00
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# PostgreSQL 16 Hybrid Multi-Tenant Setup
## Architektur Overview
- **Docker Setup**: PostgreSQL 16 Alpine via Docker Compose.
- **Rollen-Isolation**: `app_user` (DML) & `migration_user` (DDL).
- **Master Schema**: `tenants` Tabelle in `V1__init_master_schema.sql`.
- **Tenant Schemas**: `dining_areas`, `restaurant_tables`, `guests`, `reservations`, `reservation_table_assignments`, `staff_users` in `V1__init_tenant_schema.sql`.
## Backend Integration
- `TenantContext` (ThreadLocal Schema Resolver)
- `SchemaBasedMultiTenantConnectionProvider` (Hibernate Connection Handling)
- HikariCP Connection Pool optimiert für Postgres in `application.yml`.