diff --git a/migrations/20240530183519_init.down.sql b/migrations/20240530183519_init.down.sql
new file mode 100644
index 0000000..b3180c1
--- /dev/null
+++ b/migrations/20240530183519_init.down.sql
@@ -0,0 +1 @@
+DROP DOMAIN ULID CASCADE;
diff --git a/migrations/20240530183519_init.up.sql b/migrations/20240530183519_init.up.sql
new file mode 100644
index 0000000..7376d6c
--- /dev/null
+++ b/migrations/20240530183519_init.up.sql
@@ -0,0 +1 @@
+CREATE DOMAIN ULID AS CHAR(26);
diff --git a/migrations/20240530193519_typen.up.sql b/migrations/20240530193519_typen.up.sql
index 68b4081..04f3c4c 100644
--- a/migrations/20240530193519_typen.up.sql
+++ b/migrations/20240530193519_typen.up.sql
@@ -1,6 +1,7 @@
 CREATE TABLE IF NOT EXISTS typen (
     typ_id UUID PRIMARY KEY,
-    id CHAR(26) UNIQUE NOT NULL,
+    -- id CHAR(26) UNIQUE NOT NULL,
+    id ULID UNIQUE NOT NULL,
     typname VARCHAR NOT NULL,
     erstellt_am TIMESTAMP WITH TIME ZONE NOT NULL,
     geaendert_am TIMESTAMP WITH TIME ZONE NOT NULL
diff --git a/src/domain/typ/model/typ.rs b/src/domain/typ/model/typ.rs
index 7fac9cd..1f8a54b 100644
--- a/src/domain/typ/model/typ.rs
+++ b/src/domain/typ/model/typ.rs
@@ -2,8 +2,15 @@ use async_graphql::{ComplexObject, SimpleObject};
 
 use crate::scalar::{Time, Ulid};
 
-#[derive(sqlx::FromRow, SimpleObject, Clone, Debug)]
-#[graphql(complex)]
+// #[derive(Debug, sqlx::FromRow)]
+// pub struct TypDb {
+//     pub id: String,
+//     pub typname: String,
+//     pub erstellt_am: Time,
+//     pub geaendert_am: Time,
+// }
+
+#[derive(SimpleObject, Clone, sqlx::FromRow)]
 pub struct Typ {
     /// Die Ulid eines Gerätetypen
     pub id: Ulid,
@@ -18,5 +25,16 @@ pub struct Typ {
     pub geaendert_am: Time,
 }
 
+// impl From<TypDb> for Typ {
+//     fn from(db: TypDb) -> Self {
+//         Self {
+//             id: Ulid(ulid::Ulid::from_string(&db.id).expect("stored ULID is valid")),
+//             typname: db.typname,
+//             erstellt_am: db.erstellt_am,
+//             geaendert_am: db.geaendert_am,
+//         }
+//     }
+// }
+
 #[ComplexObject]
 impl Typ {}
diff --git a/src/domain/typ/repository/typ_alle.rs b/src/domain/typ/repository/typ_alle.rs
index 6bd68fb..b9c872d 100644
--- a/src/domain/typ/repository/typ_alle.rs
+++ b/src/domain/typ/repository/typ_alle.rs
@@ -11,6 +11,8 @@ impl Repository {
 
         let typen = sqlx::query_as::<_, model::Typ>(QUERY).fetch_all(db).await?;
 
+        // let typen: Vec<model::Typ> = typen.into_iter().map(model::Typ::from).collect();
+
         Ok(typen)
     }
 }
diff --git a/src/domain/typ/repository/typ_einen_zeigen.rs b/src/domain/typ/repository/typ_einen_zeigen.rs
index fe30230..92acc24 100644
--- a/src/domain/typ/repository/typ_einen_zeigen.rs
+++ b/src/domain/typ/repository/typ_einen_zeigen.rs
@@ -19,6 +19,7 @@ impl Repository {
             .bind(id)
             .fetch_one(db)
             .await?;
+        // .map(model::Typ::from)?;
 
         Ok(row)
     }
diff --git a/src/domain/typ/repository/typ_erstelle_viele.rs b/src/domain/typ/repository/typ_erstelle_viele.rs
index ab321b0..e18097b 100644
--- a/src/domain/typ/repository/typ_erstelle_viele.rs
+++ b/src/domain/typ/repository/typ_erstelle_viele.rs
@@ -13,7 +13,7 @@ impl Repository {
         typen: &[entity::TypErstellen], // input: &[Typ],
     ) -> Result<Vec<model::Typ>, Error> {
         let typ_id: Vec<Id> = typen.iter().map(|t| t.typ_id).collect();
-        let id: Vec<Ulid> = typen.iter().map(|t| t.id.to_string()).collect();
+        let id: Vec<Ulid> = typen.iter().map(|t| t.id).collect();
         let typnamen: Vec<String> = typen.iter().map(|t| t.typname.clone()).collect();
         let erstellt_am: Vec<Time> = typen.iter().map(|t| t.erstellt_am).collect();
         let geaendert_am: Vec<Time> = typen.iter().map(|t| t.geaendert_am).collect();
@@ -38,6 +38,8 @@ impl Repository {
             .fetch_all(db)
             .await?;
 
+        // let rows: Vec<model::Typ> = rows.into_iter().map(model::Typ::from).collect();
+
         Ok(rows)
     }
 }
diff --git a/src/domain/typ/repository/typ_erstellen.rs b/src/domain/typ/repository/typ_erstellen.rs
index 80cd926..1351ab5 100644
--- a/src/domain/typ/repository/typ_erstellen.rs
+++ b/src/domain/typ/repository/typ_erstellen.rs
@@ -18,12 +18,13 @@ impl Repository {
 
         let typ = sqlx::query_as::<_, model::Typ>(QUERY)
             .bind(typ.typ_id)
-            .bind(typ.id.to_string())
+            .bind(typ.id)
             .bind(typ.erstellt_am)
             .bind(typ.geaendert_am)
             .bind(&typ.typname)
             .fetch_one(db)
             .await?;
+        // .map(model::Typ::from)?;
 
         Ok(typ)
     }
diff --git a/src/domain/typ/repository/typ_loeschen.rs b/src/domain/typ/repository/typ_loeschen.rs
index a582166..aaca52a 100644
--- a/src/domain/typ/repository/typ_loeschen.rs
+++ b/src/domain/typ/repository/typ_loeschen.rs
@@ -15,9 +15,10 @@ impl Repository {
         "#;
 
         let typ = sqlx::query_as::<_, model::Typ>(QUERY)
-            .bind(typ.id.to_string())
+            .bind(typ.id)
             .fetch_one(db)
             .await?;
+        // .map(model::Typ::from)?;
 
         Ok(typ)
     }
diff --git a/src/domain/typ/repository/typ_update.rs b/src/domain/typ/repository/typ_update.rs
index 0bb62da..5491a3c 100644
--- a/src/domain/typ/repository/typ_update.rs
+++ b/src/domain/typ/repository/typ_update.rs
@@ -17,11 +17,12 @@ impl Repository {
         "#;
 
         let typ = sqlx::query_as::<_, model::Typ>(QUERY)
-            .bind(typ.id.to_string())
+            .bind(typ.id)
             .bind(typ.geaendert_am)
             .bind(&typ.typname)
             .fetch_one(db)
             .await?;
+        // .map(model::Typ::from)?;
 
         Ok(typ)
     }
diff --git a/src/domain/typ/service/typ_erstellen.rs b/src/domain/typ/service/typ_erstellen.rs
index 1d66c62..84995e7 100644
--- a/src/domain/typ/service/typ_erstellen.rs
+++ b/src/domain/typ/service/typ_erstellen.rs
@@ -1,18 +1,18 @@
 use anyhow::Error;
 use chrono::Utc;
-use ulid::Ulid;
 
 use super::Service;
 use crate::domain::typ::{
     entity,
     model::{self, TypErstelleInput},
 };
+use crate::scalar::Ulid;
 
 impl Service {
     pub async fn typ_erstellen(&self, input: TypErstelleInput) -> Result<model::Typ, Error> {
         let typ_erstellen = entity::TypErstellen {
-            typ_id: Ulid::new().into(),
-            id: Ulid::new().to_string(),
+            typ_id: ulid::Ulid::new().into(),
+            id: Ulid(ulid::Ulid::new()),
             typname: input.typname,
             erstellt_am: Utc::now(),
             geaendert_am: Utc::now(),
diff --git a/src/domain/typ/service/typ_erstellen_viele.rs b/src/domain/typ/service/typ_erstellen_viele.rs
index b9c335e..53040f7 100644
--- a/src/domain/typ/service/typ_erstellen_viele.rs
+++ b/src/domain/typ/service/typ_erstellen_viele.rs
@@ -1,11 +1,13 @@
 use anyhow::Error;
 use chrono::Utc;
-use ulid::Ulid;
 
 use super::Service;
-use crate::domain::typ::{
-    entity,
-    model::{self, TypErstelleInput},
+use crate::{
+    domain::typ::{
+        entity,
+        model::{self, TypErstelleInput},
+    },
+    scalar::Ulid,
 };
 
 impl Service {
@@ -16,8 +18,8 @@ impl Service {
         let typen_erstellen: Vec<entity::TypErstellen> = input
             .iter()
             .map(|t| entity::TypErstellen {
-                typ_id: Ulid::new().into(),
-                id: Ulid::new().to_string(),
+                typ_id: ulid::Ulid::new().into(),
+                id: Ulid(ulid::Ulid::new()),
                 typname: t.typname.clone(),
                 erstellt_am: Utc::now(),
                 geaendert_am: Utc::now(),
diff --git a/src/scalar.rs b/src/scalar.rs
index 6793fc4..461bb79 100644
--- a/src/scalar.rs
+++ b/src/scalar.rs
@@ -1,3 +1,4 @@
+use async_graphql::*;
 /// It is easier to track each type alias if this file is located on the top-level directory (here)
 /// than in each domain. Also, separating them will create a lot of duplicate code.
 use uuid::Uuid;
@@ -9,7 +10,95 @@ pub type Time = chrono::DateTime<chrono::Utc>;
 /// When expected as an input type, any string (such as "4") or integer (such as 4) input value will be accepted as an ID.
 pub type Id = Uuid;
 
-/// ödsklfjsdf
-/// debug_assert_eq!(ödsklfjsdfasdfas
-/// ödsklfjsdfasdfasdfsa,
-pub type Ulid = String;
+// pub type Ulid = String;
+
+// pub type Ulid = ulid::Ulid;
+
+// #[derive(Clone, Copy, Eq, PartialEq)]
+// pub struct Ulid(pub ulid::Ulid);
+//
+// /// The ULID scalar type represents a Universally Unique Lexicographically Sortable Identifier as defined by the ULID specification.
+// /// ULIDs are 26-character strings that are URL-safe, case-insensitive, and lexicographically sortable,
+// /// making them ideal for distributed systems requiring time-ordered unique identifiers.
+// #[Scalar]
+// impl ScalarType for Ulid {
+//     fn parse(value: Value) -> InputValueResult<Self> {
+//         match value {
+//             Value::String(s) => {
+//                 let ulid = ulid::Ulid::from_string(&s).map_err(InputValueError::custom)?;
+//                 Ok(Ulid(ulid))
+//             }
+//             _ => Err(InputValueError::expected_type(value)),
+//         }
+//     }
+//
+//     fn to_value(&self) -> Value {
+//         Value::String(self.0.to_string())
+//     }
+// }
+//
+// impl fmt::Display for Ulid {
+//     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+//         write!(f, "{}", self.0) // delegiert an Ulid::to_string()
+//     }
+// }
+//
+//
+//
+use sqlx::{
+    postgres::{PgArgumentBuffer, PgHasArrayType, PgTypeInfo, PgValueRef},
+    Decode, Encode, Postgres, Type,
+};
+
+// #[derive(sqlx::Type)]
+// #[sqlx(type_name = "ULID")]
+// #[sqlx(no_pg_array)]
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub struct Ulid(pub ulid::Ulid);
+
+#[Scalar]
+impl ScalarType for Ulid {
+    fn parse(value: Value) -> InputValueResult<Self> {
+        match value {
+            Value::String(s) => {
+                let ulid = ulid::Ulid::from_string(&s).map_err(InputValueError::custom)?;
+                Ok(Ulid(ulid))
+            }
+            _ => Err(InputValueError::expected_type(value)),
+        }
+    }
+
+    fn to_value(&self) -> Value {
+        Value::String(self.0.to_string())
+    }
+}
+
+impl Type<Postgres> for Ulid {
+    fn type_info() -> PgTypeInfo {
+        PgTypeInfo::with_name("ULID")
+    }
+    fn compatible(ty: &PgTypeInfo) -> bool {
+        <String as Type<Postgres>>::compatible(ty)
+    }
+}
+impl<'r> Decode<'r, Postgres> for Ulid {
+    fn decode(value: PgValueRef<'r>) -> Result<Self, Box<dyn std::error::Error + Send + Sync>> {
+        let s = <String as Decode<Postgres>>::decode(value)?;
+
+        Ok(Ulid(ulid::Ulid::from_string(s.trim())?))
+    }
+}
+
+impl<'q> Encode<'q, Postgres> for Ulid {
+    fn encode_by_ref(
+        &self,
+        buf: &mut PgArgumentBuffer,
+    ) -> Result<sqlx::encode::IsNull, Box<dyn std::error::Error + Send + Sync>> {
+        <String as Encode<Postgres>>::encode(self.0.to_string(), buf)
+    }
+}
+impl PgHasArrayType for Ulid {
+    fn array_type_info() -> PgTypeInfo {
+        PgTypeInfo::with_name("_ULID")
+    }
+}
diff --git a/src/sqlx_datatype.rs b/src/sqlx_datatype.rs
new file mode 100644
index 0000000..c4a3579
--- /dev/null
+++ b/src/sqlx_datatype.rs
@@ -0,0 +1,23 @@
+// // SQLx sieht den Typ als Text (PostgreSQL: CHAR, VARCHAR, TEXT) impl Type<Postgres> for Ulid {
+//     fn type_info() -> sqlx::postgres::PgTypeInfo {
+//         // CHAR(26) ist in PostgreSQL intern ein Text-Typ
+//         <String as Type<Postgres>>::type_info()
+//     }
+// }
+//
+// impl<'r> Decode<'r, Postgres> for MyUlid {
+//     fn decode(
+//         value: sqlx::postgres::PgValueRef<'r>,
+//     ) -> Result<Self, Box<dyn std::error::Error + 'static + Send + Sync>> {
+//         let s = <String as Decode<Postgres>>::decode(value)?;
+//         Ulid::from_string(&s)
+//             .map(MyUlid)
+//             .map_err(|e| format!("Invalid ULID: {}", e).into())
+//     }
+// }
+//
+// impl<'q> Encode<'q, Postgres> for MyUlid {
+//     fn encode_by_ref(&self, buf: &mut sqlx::postgres::PgArgumentBuffer) -> sqlx::encode::IsNull {
+//         <String as Encode<Postgres>>::encode(self.0.to_string(), buf)
+//     }
+// }