data/schema.md

# CrossER v2 Data Schema

## entities.json

```json
{
  "entity_id": "tc2_prod_0001",
  "source_system": "SAP_TC2",
  "entity_type": "product",
  "name": "Maltodextrin DE20 Grade A",
  "attributes": {
    "category": "starches",
    "sub_category": "maltodextrin",
    "cn_code": "CN 1702.90",
    "dextrose_equivalent": 20,
    "grade": "A",
    "region": "NA",
    "cost_center": "CC-412",
    "status": "active"
  }
}
```

### Source Systems

| System | ID Prefix | Naming Style | Completeness |
|--------|-----------|-------------|-------------|
| SAP_TC2 | `tc2_` | Formal English | 95% |
| SAP_CFIN | `cfin_` | Internal codes | 90% |
| SAP_APAC | `apac_` | Abbreviated | 60% |
| LEGACY_ERP | `leg_` | Cryptic codes | 45% |
| SHAREPOINT | `sp_` | Authoritative | 85% |

### Entity Types
- `product` — Physical products (starches, sugars, acids, proteins, oils)
- `supplier` — Vendor/supplier companies
- `tax_code` — Tax classification codes (CN/HS codes)
- `legal_entity` — Legal entities / subsidiaries

## pairs.json

```json
{
  "pair_id": "pair_0001",
  "entity_a": "tc2_prod_0001",
  "entity_b": "cfin_prod_0001",
  "label": "match",
  "string_similarity": 0.234,
  "attribute_overlap": 0.500,
  "difficulty_tier": "hard",
  "entity_type": "product",
  "system_pair": ["SAP_CFIN", "SAP_TC2"]
}
```

### Labels
- `match` — Same real-world entity
- `no_match` — Different entities
- `ambiguous` — Requires human judgment

### Difficulty Tiers
- `easy` — String sim >= 0.70
- `medium` — String sim 0.30-0.70
- `hard` — String sim < 0.30
- `adversarial_negative` — High similarity but NOT a match
- `medium_negative` / `obvious_negative` — No-match tiers

## Splits & Subsets

- `splits/{train,val,test}.json` — 40/20/40 stratified split
- `subsets/crosser_easy.json` — Easy-tier test pairs
- `subsets/crosser_hard.json` — Hard + adversarial test pairs

## Oracle Context

- `context/structured/oracle_context.json` — Complete pairwise migration records
- `context/structured/alias_table.json` — Canonical entity alias groups

## Demo Subset

- `demo/*.csv` — Per-system entity CSVs
- `demo/ground_truth.csv` — Labeled pairs
- `demo/rules.yaml` — Business rules
- `demo/knowledge.yaml` — Domain knowledge artifacts

---

# Extended Pipelines (--pipeline full)

## Email Chains (`email_chains/`)

```json
// chains.json — array of email threads
{
  "chain_id": "email_chain_0001",
  "domain": "commodity_trading",
  "messages": [
    {
      "message_id": "email_chain_0001_msg_001",
      "sender": "s.chen@globalfoods.com",
      "sender_name": "Sarah Chen",
      "sender_role": "Operations Manager, North America",
      "recipients": ["j.morrison@globalfoods.com"],
      "subject": "RE: Is Maltodextrin DE20 Grade A in SAP_TC2 the same as record in SAP_CFIN?",
      "body": "...",
      "timestamp": "2025-07-15T09:00:00"
    }
  ]
}
```

### Email Prediction Format

```json
[
  {
    "chain_id": "email_chain_0001",
    "extracted_knowledge": [{"type": "entity_mapping", "description": "..."}],
    "extracted_relationships": [{"type": "discussed_in_context", "entities_involved": 2}],
    "extracted_corrections": [{"type": "expert_correction", "source_message_ids": ["..."]}]
  }
]
```

## Support Tickets (`tickets/`)

```json
// tickets.json
{
  "ticket_id": "TKT-0001",
  "domain": "commodity_trading",
  "title": "Product ID mismatch between SAP_TC2 and SAP_CFIN",
  "priority": "high",
  "resolution": {
    "resolution_type": "entity_mapping",
    "verdict": "confirmed_match",
    "confidence": 0.95,
    "reasoning": "..."
  },
  "referenced_precedents": ["TKT-0003"]
}
```

### Ticket Prediction Format

```json
[
  {
    "ticket_id": "TKT-0001",
    "predicted_resolution": "confirmed_match",
    "referenced_precedent_ids": ["TKT-0003"],
    "extracted_knowledge": [{"type": "entity_mapping", "description": "..."}]
  }
]
```

## ERP Events (`erp_events/`)

```json
// events.json
{
  "event_id": "EVT-000001",
  "timestamp": "2025-01-15T10:30:00",
  "source_system": "SAP_TC2",
  "event_type": "purchase_order_created",
  "entity_refs": [
    {"entity_type": "product", "id": "TC2-1234", "name": "Maltodextrin DE20 Grade A"},
    {"entity_type": "supplier", "id": "SUP-12345", "name": "Cargill Inc."}
  ],
  "attributes": {"amount": 50000.00, "currency": "USD"},
  "related_events": ["EVT-000002"]
}
```

### ERP Prediction Format

```json
[
  {
    "event_id": "EVT-000001",
    "linked_entity_ids": ["EVT-000002"],
    "normalized_event_type": "purchase_order_created"
  }
]
```

## Cases (`cases/`)

```json
// cases.json
{
  "case_id": "CASE-0001",
  "case_type": "entity_disambiguation",
  "domain": "commodity_trading",
  "linked_entities": [...],
  "resolution": {"verdict": "approved", "confidence": 0.9, "evidence": [...]},
  "cited_precedents": ["CASE-0003"]
}
```

### Case Prediction Format

```json
[
  {
    "case_id": "CASE-0001",
    "predicted_precedent_ids": ["CASE-0003", "CASE-0007"],
    "predicted_resolution": "approved",
    "context_entities": ["entity_a", "entity_b"]
  }
]
```

## Corrections (`corrections/`)

```json
// sequences.json
{
  "sequence_id": "CORR-0001",
  "pattern_id": "entity_mapping_fix",
  "domain": "commodity_trading",
  "steps": [
    {"step_index": 0, "step_type": "system_proposes_mapping", ...},
    {"step_index": 1, "step_type": "expert_reviews", ...},
    {"step_index": 2, "step_type": "expert_rejects", ...},
    {"step_index": 3, "step_type": "expert_provides_correct_mapping", ...}
  ]
}
```

### Correction Prediction Format

```json
[
  {
    "sequence_id": "CORR-0001",
    "generated_rules": [{"type": "override_mapping", "condition": "...", "action": "..."}],
    "updated_mappings": [{"entity_a": "...", "entity_b": "...", "is_match": true}]
  }
]
```

## Knowledge Documents (`knowledge_docs/`)

```json
// manifest.json
{
  "doc_id": "KDOC-0001",
  "filename": "KDOC-0001_concept_commodity_trading.md",
  "title": "Concept: Dextrose Equivalent and Its Impact on Classification",
  "doc_type": "concept",
  "domain": "commodity_trading"
}
```

### Knowledge Prediction Format

```json
[
  {
    "doc_id": "KDOC-0001",
    "extracted_artifacts": [
      {"type": "concept", "content": "...", "entities": [...], "confidence": 0.95}
    ]
  }
]
```