diff --git a/backend/internal/domain/inventory.go b/backend/internal/domain/inventory.go
index c78923f..4b325d9 100644
--- a/backend/internal/domain/inventory.go
+++ b/backend/internal/domain/inventory.go
@@ -7,33 +7,41 @@ import (
 	validation "github.com/go-ozzo/ozzo-validation/v4"
 )
 
-type InventoryStatus string
+type InventoryStatus struct {
+	ID   int    `json:"id"`
+	Name string `json:"name"`
+}
 
-const (
-	StatusInStock    InventoryStatus = "In Stock"
-	StatusLowStock   InventoryStatus = "Low Stock"
-	StatusOutOfStock InventoryStatus = "Out of Stock"
-)
+type InventoryCategory struct {
+	ID   int    `json:"id"`
+	Name string `json:"name"`
+}
+
+type HarvestUnit struct {
+	ID   int    `json:"id"`
+	Name string `json:"name"`
+}
 
 type InventoryItem struct {
-	ID        string
-	UserID    string
-	Name      string
-	Category  string
-	Type      string
-	Quantity  float64
-	Unit      string
-	DateAdded time.Time
-	Status    InventoryStatus
-	CreatedAt time.Time
-	UpdatedAt time.Time
+	ID         string
+	UserID     string
+	Name       string
+	CategoryID int
+	Category   InventoryCategory
+	Quantity   float64
+	UnitID     int
+	Unit       HarvestUnit
+	DateAdded  time.Time
+	StatusID   int
+	Status     InventoryStatus
+	CreatedAt  time.Time
+	UpdatedAt  time.Time
 }
 
 type InventoryFilter struct {
 	UserID      string
-	Category    string
-	Type        string
-	Status      InventoryStatus
+	CategoryID  int
+	StatusID    int
 	StartDate   time.Time
 	EndDate     time.Time
 	SearchQuery string
@@ -48,11 +56,11 @@ func (i *InventoryItem) Validate() error {
 	return validation.ValidateStruct(i,
 		validation.Field(&i.UserID, validation.Required),
 		validation.Field(&i.Name, validation.Required),
-		validation.Field(&i.Category, validation.Required),
-		validation.Field(&i.Type, validation.Required),
+		validation.Field(&i.CategoryID, validation.Required),
 		validation.Field(&i.Quantity, validation.Required, validation.Min(0.0)),
-		validation.Field(&i.Unit, validation.Required),
-		validation.Field(&i.Status, validation.Required, validation.In(StatusInStock, StatusLowStock, StatusOutOfStock)),
+		validation.Field(&i.UnitID, validation.Required),
+		validation.Field(&i.StatusID, validation.Required),
+		validation.Field(&i.DateAdded, validation.Required),
 	)
 }
 
@@ -62,4 +70,10 @@ type InventoryRepository interface {
 	GetAll(ctx context.Context) ([]InventoryItem, error)
 	CreateOrUpdate(ctx context.Context, item *InventoryItem) error
 	Delete(ctx context.Context, id, userID string) error
+	GetStatuses(ctx context.Context) ([]InventoryStatus, error)
+	GetCategories(ctx context.Context) ([]InventoryCategory, error)
+}
+
+type HarvestRepository interface {
+	GetUnits(ctx context.Context) ([]HarvestUnit, error)
 }