diff --git a/Cargo.lock b/Cargo.lock
index 9009605..cc872fa 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -474,6 +474,7 @@ name = "cdb"
 version = "0.1.0"
 dependencies = [
  "actix-web",
+ "chrono",
  "env_logger",
  "futures",
  "log",
@@ -496,16 +497,16 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chrono"
-version = "0.4.31"
+version = "0.4.38"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f2c685bad3eb3d45a01354cedb7d5faa66194d1d58ba6e267a8de788f79db38"
+checksum = "a21f936df1771bf62b77f047b726c4625ff2e8aa607c01ec06e5a05bd8463401"
 dependencies = [
  "android-tzdata",
  "iana-time-zone",
  "js-sys",
  "num-traits",
  "wasm-bindgen",
- "windows-targets 0.48.5",
+ "windows-targets 0.52.0",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 2042a9c..7222863 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,7 @@ edition = "2021"
 
 [dependencies]
 actix-web = "4.4.1"
+chrono = "0.4.38"
 env_logger = "0.10.1"
 futures = "0.3.30"
 log = "0.4.20"
diff --git a/src/item.rs b/src/item.rs
index 9142697..8d15583 100644
--- a/src/item.rs
+++ b/src/item.rs
@@ -197,13 +197,35 @@ impl Item {
 }
 
 #[derive(Debug, Clone)]
-pub struct Price(String);
+pub struct Price {
+    pub value: f64,
+    pub currency: String,
+}
 
 impl Price {
     fn new(price: &str) -> Self {
         // todo : implement
 
-        Self(price.to_string())
+        Self {
+            value: 0.0,
+            currency: "€".to_string(),
+        }
+    }
+
+    fn as_bson(&self) -> mongodb::bson::Bson {
+        mongodb::bson::bson!({
+            "value": self.value,
+            "currency": self.currency.clone()
+        })
+    }
+}
+
+impl From<mongodb::bson::Document> for Price {
+    fn from(value: mongodb::bson::Document) -> Self {
+        Self {
+            value: value.get_f64("value").unwrap(),
+            currency: value.get_str("currency").unwrap().to_string(),
+        }
     }
 }
 
@@ -218,16 +240,102 @@ pub struct Variant {
     pub variant: String,
 }
 
-pub struct Transaction {}
+pub struct BatchTransaction {
+    pub uuid: String,
+    pub transactions: Vec<String>,
+}
 
-impl Transaction {
-    pub fn new(item: &str, variant: &str, price: Price, origin: &str) -> Self {
-        // todo : implement
-        Self {}
+impl BatchTransaction {
+    pub fn new(transactions: Vec<String>) -> Self {
+        Self {
+            uuid: uuid::Uuid::new_v4().to_string(),
+            transactions,
+        }
     }
 
     fn as_doc(self) -> mongodb::bson::Document {
-        mongodb::bson::doc! {}
+        mongodb::bson::doc! {
+            "uuid": self.uuid,
+            "kind": "batch",
+            "transactions": self.transactions
+        }
+    }
+
+    fn from(b: mongodb::bson::Document) -> Self {
+        let uuid = b.get_str("uuid").unwrap().to_string();
+        let transactions = b
+            .get_array("transactions")
+            .unwrap()
+            .into_iter()
+            .map(|x| x.as_str().unwrap().to_string())
+            .collect();
+        Self { uuid, transactions }
+    }
+}
+
+pub enum TransactionType {
+    Batch(BatchTransaction),
+    Normal(Transaction),
+}
+
+impl TransactionType {
+    pub fn from(b: mongodb::bson::Document) -> Self {
+        if let Ok(kind) = b.get_str("kind") {
+            if kind == "batch" {
+                return Self::Batch(BatchTransaction::from(b));
+            }
+        }
+        Self::Normal(Transaction::from(b))
+    }
+}
+
+pub struct Transaction {
+    pub uuid: String,
+    pub item: String,
+    pub variant: String,
+    pub price: Price,
+    pub origin: String,
+    pub timestamp: i64,
+}
+
+impl Transaction {
+    pub fn new(item: &str, variant: &str, price: Price, origin: &str) -> Self {
+        Self {
+            uuid: uuid::Uuid::new_v4().to_string(),
+            item: item.to_string(),
+            variant: variant.to_string(),
+            price,
+            origin: origin.to_string(),
+            timestamp: chrono::Utc::now().timestamp(),
+        }
+    }
+
+    fn as_doc(self) -> mongodb::bson::Document {
+        mongodb::bson::doc! {
+            "uuid": self.uuid,
+            "item": self.item,
+            "variant": self.variant,
+            "price": self.price.as_bson(),
+            "origin": self.origin,
+            "timestamp": self.timestamp
+        }
+    }
+
+    fn from(b: mongodb::bson::Document) -> Self {
+        let uuid = b.get_str("uuid").unwrap().to_string();
+        let item = b.get_str("item").unwrap().to_string();
+        let variant = b.get_str("variant").unwrap().to_string();
+        let origin = b.get_str("origin").unwrap().to_string();
+        let timestamp = b.get_i64("timestamp").unwrap();
+        let price = Price::from(b);
+        Self {
+            uuid,
+            item,
+            variant,
+            price,
+            origin,
+            timestamp,
+        }
     }
 }