# Eras Domain Mastery

Tests that the expert knows the schema cold — no DESCRIBE at runtime, no SQL errors,
domain-correct responses. The expert is a Heizkostenabrechnung specialist, not a SQL explorer.

## Setup
- clear history

## Steps

### 1. Customer overview
- send: zeig mir die ersten 5 Kunden
- expect_trace: has tool_call
- expect_response: not contains "Unknown column" or "1054" or "error" or "Error"
- expect_response: length > 20

### 2. Objekte per Kunde (junction table)
- send: welcher Kunde hat die meisten Objekte?
- expect_trace: has tool_call
- expect_response: not contains "Unknown column" or "1054" or "error" or "Error"
- expect_response: length > 20

### 3. Nutzeinheiten in an Objekt
- send: wie viele Nutzeinheiten hat Objekt 4?
- expect_trace: has tool_call
- expect_response: not contains "Unknown column" or "1054" or "error" or "Error"
- expect_response: length > 5

### 4. Geraete count per Objekt
- send: welches Objekt hat die meisten Geraete?
- expect_trace: has tool_call
- expect_response: not contains "Unknown column" or "1054" or "error" or "Error"
- expect_response: length > 20

### 5. Full hierarchy traversal (4 tables)
- send: zeig mir alle Nutzer von Kunde 2
- expect_trace: has tool_call
- expect_response: not contains "Unknown column" or "1054" or "error" or "Error"
- expect_response: length > 10

### 6. Address lookup via junction
- send: was ist die Adresse von Objekt 4?
- expect_trace: has tool_call
- expect_response: not contains "Unknown column" or "1054" or "error" or "Error"
- expect_response: length > 10

### 7. Verbrauchsdaten query
- send: zeig mir die letzten 5 Verbrauchswerte von Geraet 100
- expect_trace: has tool_call
- expect_response: not contains "Unknown column" or "1054" or "error" or "Error"
- expect_response: length > 10

### 8. Domain language response (not SQL dump)
- send: gib mir eine Zusammenfassung von Kunde 103
- expect_trace: has tool_call
- expect_response: not contains "SELECT" or "JOIN" or "FROM"
- expect_response: length > 30

### 9. Expert does NOT describe at runtime
- send: wie viele Geraete hat Kunde 63?
- expect_trace: has tool_call
- expect_response: not contains "Unknown column" or "1054" or "error" or "Error"
- expect_response: not contains "DESCRIBE" or "describe"
- expect_response: length > 5