diff --git a/wagfarm-api/main.go b/wagfarm-api/main.go
index 113e732..fa230ab 100644
--- a/wagfarm-api/main.go
+++ b/wagfarm-api/main.go
@@ -27,18 +27,26 @@ func initLogging() {
 	gin.DefaultWriter = f // capture Gin logs too
 }
 
+func dbMigration() {
+		database.DB.AutoMigrate(
+		&models.AssetType{},
+		&models.Asset{},
+		&models.LogType{},
+		&models.Log{},
+	)
+	
+	db.Create(&models.AssetType{Name: "machine"})
+	db.Create(&models.AssetType{Name: "field"})
+	db.Create(&models.AssetType{Name: "animal"})
+	db.Create(&models.AssetType{Name: "substance"})
+}
+
 func main() {
 	initLogging()
 
 	log.Println("Starting API server...")
 
 	database.Connect()
-	database.DB.AutoMigrate(
-		&models.AssetType{},
-		&models.Asset{},
-		&models.LogType{},
-		&models.Log{},
-	)
 
 	r := gin.Default()
 	routes.SetupRoutes(r)
diff --git a/wagfarm-api/models/Schlagkartei52.xlsm b/wagfarm-api/models/Schlagkartei52.xlsm
new file mode 100755
index 0000000..8401b7a
Binary files /dev/null and b/wagfarm-api/models/Schlagkartei52.xlsm differ
diff --git a/wagfarm-api/models/asset_models.go b/wagfarm-api/models/asset_models.go
new file mode 100644
index 0000000..125f1a1
--- /dev/null
+++ b/wagfarm-api/models/asset_models.go
@@ -0,0 +1,66 @@
+package models
+
+type _Asset struct {
+	ID		uint	`gorm:"primaryKey`
+	Name	string	`gorm:"not null"`
+	Notes	string	
+}
+
+type Land struct {
+	_Asset
+	FID						string	`gorm:"not null"`
+	IsWaterProtectionArea	bool	`gorm:"not null"`
+	IsRedArea				bool	`gorm:"not null"`
+	Betriebsnummer?
+	Area					float64	`gorm:"not null"`
+}
+
+type Plant struct {
+	_Asset
+	LandId			uint		`gorm:"not null"`	
+	Land			Land		`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+	CropID 			uint		`gorm:"not null"`
+	Crop			Taxonomy	`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+	CoverCropID 	uint		`gorm:"not null"`
+	CoverCrop		Taxonomy	`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+	Year 			uint		`gorm:"not null"`
+	AreaPercentage	float64		`gorm:"not null"`
+}
+
+type Machine struct {
+	_Asset
+	UnitID	uint		`gorm:"not null"`
+	Unit 	Taxonomy	`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+	Cost 	float64		`gorm:"not null; type:decimal(10,2);"` // in euro
+}
+
+type SeedType struct {
+	ID		uint		`gorm:"primaryKey`
+	Name	string		`gorm:"not null"`
+	CropID	uint		`gorm:"not null"`
+	Crop	Taxonomy	`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+}
+
+type Seed struct {
+	_Asset
+	BuyDate			Datetime.Time	`gorm:"type:date;default:CURRENT_DATE"`
+	UnitID			uint			`gorm:"not null"`
+	Unit 			Taxonomy		`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+	Cost 			float64			`gorm:"not null; type:decimal(10,2);"` // in euro/unit
+	SourcedFromID	uint			`gorm:"not null"`
+	SourcedFrom		Taxonomy		`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+	SeedTypeID		uint			`gorm:"not null"`
+	SeedType		SeedType		`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+}
+
+type Fertilizer struct {
+	_Asset
+	BuyDate				Datetime.Time	`gorm:"type:date;default:CURRENT_DATE"`
+	UnitID				uint			`gorm:"not null"`
+	Unit 				Taxonomy		`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+	Cost 				float64			`gorm:"not null; type:decimal(10,2);"` // in euro/unit
+	SourcedFromID		uint			`gorm:"not null"`
+	SourcedFrom			Taxonomy		`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+	FertilizerTypeID	uint			`gorm:"not null"`
+	FertilizerType		Taxonomy		`gorm:"not null; constraint:OnUpdate:CASCADE,OnDelete:CASCADE;"`
+}
\ No newline at end of file
diff --git a/wagfarm-api/models/log_models.go b/wagfarm-api/models/log_models.go
new file mode 100644
index 0000000..693a3ad
--- /dev/null
+++ b/wagfarm-api/models/log_models.go
@@ -0,0 +1,41 @@
+type Log struct {
+	ID			uint			`gorm:"primaryKey"`
+	Name		string			`gorm:"not null"`
+	Notes		string	
+	LogType		string			`gorm:"not null"`
+	Date		Datetime.Time	`gorm:"type:date;default:CURRENT_DATE"not null`
+	Duration	float64			`gorm:"not null"` // in hours
+	VisibiltyID uint			`gorm:"not null"`
+	Visibility	Taxonomy		`gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE;not null"`
+}
+
+type _LogMetadata struct {
+	ID	uint	`gorm:"primaryKey"`
+	LogID uint	`gorm:"not null"`
+	Log	Log		`gorm:"foreignKey:LogID;constraint:OnUpdate:CASCADE,OnDelete:CASCADE;not null"`
+}
+
+type _FieldWorkLog struct {
+	_LogMetadata
+	WorkedAreaPercentage	float64	`gorm:"not null"`
+	MachineID				uint	`gorm:"not null"`
+	Machine					Machine	`gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE;not null"`
+}
+
+type SeedingLog struct {
+	_FieldWorkLog
+	SeedID			uint		`gorm:"not null"`
+	Seed			Seed		`gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE;not null"`
+	TechniqueID 	uint		`gorm:"not null"`
+	Technique		Taxonomy	`gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE;not null"`
+	Amount			float64		`gorm:"not null"` // in units/ha
+	ConditionsID 	uint		`gorm:"not null"`
+	Conditions		Taxonomy	`gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE;not null"`
+}
+
+type FertilizingLog struct {
+	_FieldWorkLog
+	FertilizerID	uint		`gorm:"not null"`
+	Fertilizer		Fertilizer	`gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE;not null"`
+	Amount			float64		`gorm:"not null"` // in units/ha
+}
\ No newline at end of file
diff --git a/wagfarm-api/models/models.go b/wagfarm-api/models/models.go
deleted file mode 100644
index 691a545..0000000
--- a/wagfarm-api/models/models.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package models
-
-type AssetType struct {
-	ID   uint   `gorm:"primaryKey" json:"id"`
-	Name string `gorm:"unique;not null" json:"name"`
-}
-
-type Asset struct {
-	ID          uint      `gorm:"primaryKey" json:"id"`
-	Name        string    `gorm:"not null" json:"name"`
-	AssetTypeID uint      `json:"asset_type_id"`
-	AssetType   AssetType `gorm:"foreignKey:AssetTypeID" json:"-"`
-}
-
-type LogType struct {
-	ID   uint   `gorm:"primaryKey" json:"id"`
-	Name string `gorm:"unique;not null" json:"name"`
-}
-
-type Log struct {
-	ID        uint    `gorm:"primaryKey" json:"id"`
-	Name      string  `gorm:"not null" json:"name"`
-	LogTypeID uint    `json:"log_type_id"`
-	LogType   LogType `gorm:"foreignKey:LogTypeID" json:"-"`
-	Date      string  `gorm:"type:date;default:CURRENT_DATE" json:"date"`
-	Equipment []Asset `gorm:"many2many:log_equipment_asset;" json:"equipment"`
-	Substance []Asset `gorm:"many2many:log_substance_asset;" json:"substance"`
-}
diff --git a/wagfarm-api/models/taxonomy_models.go b/wagfarm-api/models/taxonomy_models.go
new file mode 100644
index 0000000..650007a
--- /dev/null
+++ b/wagfarm-api/models/taxonomy_models.go
@@ -0,0 +1,7 @@
+package models
+
+type Taxonomy struct {
+	ID    uint   `gorm:"primaryKey" json:"id"`
+	Type  string `gorm:"not null;index" json:"type"` // e.g., "unit", "color", etc.
+	Name   string `gorm:"not null;index" json:"name"`  // e.g., "kg", "lb"
+}
\ No newline at end of file