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docs/mvp/ddd/07-inventory-bc.md

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+# Inventory BC - Detailliertes Domain Model
+
+**Bounded Context:** Inventory
+**Domain Type:** CORE
+**Verantwortung:** Chargen-basierte Bestandsführung, Rückverfolgbarkeit, MHD-Tracking
+
+## Aggregates
+
+### Stock (Aggregate Root)
+
+```
+Stock
+├── StockId
+├── ArticleId - Reference to Master Data
+├── StorageLocationId
+├── BranchId
+├── StockLevel (Quantity) - Current total
+├── Batches[] (Entity) - Batch-level inventory (CRITICAL!)
+│   ├── BatchId - ProductionBatchId OR SupplierBatchId
+│   ├── BatchType (PRODUCED | PURCHASED)
+│   ├── Quantity
+│   ├── ExpiryDate (MHD)
+│   ├── ReceivedAt
+│   └── Status (AVAILABLE | RESERVED | EXPIRED | SOLD)
+├── MinimumStockLevel
+└── ReorderPoint
+
+Invariants:
+- StockLevel = SUM(Batches.Quantity where Status = AVAILABLE)
+- Cannot withdraw more than available
+- FEFO enforced: oldest expiry first
+- Negative stock not allowed
+- Expired batches must have Status = EXPIRED
+```
+
+### StockMovement (Aggregate Root) - Event Sourcing candidate!
+
+```
+StockMovement
+├── StockMovementId
+├── ArticleId
+├── BatchId - CRITICAL for traceability
+├── MovementType (GOODS_RECEIPT | PRODUCTION_OUTPUT | SALE |
+│                  INTER_BRANCH_TRANSFER | WASTE | ADJUSTMENT)
+├── FromLocation, ToLocation
+├── FromBranch, ToBranch
+├── Quantity
+├── MovementDate
+├── PerformedBy (UserId)
+├── Reason (for WASTE/ADJUSTMENT)
+├── ReferenceDocument (GoodsReceiptId, ProductionOrderId, InvoiceId)
+└── TraceabilityChain - Link to upstream/downstream
+
+Invariants:
+- Quantity must be positive
+- GOODS_RECEIPT: FromLocation = null
+- SALE/WASTE: ToLocation = null
+- INTER_BRANCH_TRANSFER: FromBranch != ToBranch
+- All movements must reference a Batch
+```
+
+## Domain Events
+
+```java
+StockLevelBelowMinimum(ArticleId, BranchId, Quantity)
+BatchExpiringSoon(BatchId, ArticleId, ExpiryDate)
+StockMovementRecorded(StockMovementId, BatchId, MovementType)
+```