feat: Provide basic barcode handling support

44 files changed, 1409 insertions, 130 deletions

diff --git a/crates/rocie-cli/src/cli.rs b/crates/rocie-cli/src/cli.rs
index ac220d5..3f2662b 100644
--- a/crates/rocie-cli/src/cli.rs
+++ b/crates/rocie-cli/src/cli.rs
@@ -14,21 +14,62 @@ pub(crate) enum Command {
         #[command(subcommand)]
         command: ProductCommand,
     },
+
+    /// Deal with products
+    Unit {
+        #[command(subcommand)]
+        command: UnitCommand,
+    },
+}
+
+#[derive(Subcommand)]
+pub(crate) enum UnitCommand {
+    /// Register a new unit
+    Register {
+        /// The full singular name of the new unit
+        /// E.g.: 1 kilogram
+        #[arg(short = 's', long)]
+        full_name_singular: String,
+
+        /// The full plural name of the new unit
+        /// E.g.: 5 kilograms
+        #[arg(short = 'p', long)]
+        full_name_plural: String,
+
+        /// The short name of the new unit (short names have no plural)
+        /// E.g.: 1 kg or 5 kg
+        #[arg(short = 'n', long)]
+        short_name: String,
+
+        /// Optional description of the new unit
+        #[arg(short, long)]
+        description: Option<String>,
+    },
+
+    /// Fetch an unit based on id
+    GetById {
+        /// The id of the unit
+        #[arg(short, long)]
+        id: Uuid,
+    },
+
+    /// List all available units
+    List {},
 }
 
 #[derive(Subcommand)]
 pub(crate) enum ProductCommand {
     /// Register a new product
     Register {
-        /// The name of new the product
+        /// The name of the new product
         #[arg(short, long)]
         name: String,
 
-        /// Optional description of the new the product
+        /// Optional description of the new product
         #[arg(short, long)]
         description: Option<String>,
 
-        /// Optional parent of the new the product
+        /// Optional parent of the new product
         #[arg(short, long)]
         parent: Option<Uuid>,
     },
@@ -48,7 +89,7 @@ pub(crate) enum ProductCommand {
 
         /// The unit the amount value is in
         #[arg(short = 'u', long)]
-        amount_unit: String,
+        amount_unit_id: Uuid,
     },
 
     /// Get a already registered product by id
diff --git a/crates/rocie-cli/src/handle/mod.rs b/crates/rocie-cli/src/handle/mod.rs
new file mode 100644
index 0000000..1d322f8
--- /dev/null
+++ b/crates/rocie-cli/src/handle/mod.rs
@@ -0,0 +1,148 @@
+use crate::cli::{ProductCommand, UnitCommand};
+
+use anyhow::{Context, Result};
+use rocie_client::{
+    apis::{
+        api_get_product_api::{product_by_id, products},
+        api_get_unit_api::{unit_by_id, units},
+        api_set_product_api::{associate_barcode, register_product},
+        api_set_unit_api::register_unit,
+        configuration::Configuration,
+    },
+    models::{Barcode, UnitAmount, UnitStub},
+};
+
+pub(crate) async fn product(config: &Configuration, command: ProductCommand) -> Result<()> {
+    match command {
+        ProductCommand::Register {
+            name,
+            description,
+            parent,
+        } => {
+            let new_id = register_product(
+                config,
+                rocie_client::models::ProductStub {
+                    description: Some(description), // TODO: Fix the duplicate option
+                    name,
+                    parent,
+                },
+            )
+            .await
+            .context("Failed to register new product")?;
+
+            println!("Registered new product with id: {new_id}");
+        }
+
+        ProductCommand::Get { id } => {
+            let product = product_by_id(config, id.to_string().as_str())
+                .await
+                .with_context(|| format!("Failed to get product with id: {id}"))?;
+
+            println!("{product:#?}");
+        }
+
+        ProductCommand::AssociateBarcode {
+            product_id,
+            barcode_number,
+            amount_value,
+            amount_unit_id,
+        } => associate_barcode(
+            config,
+            product_id.to_string().as_str(),
+            Barcode {
+                id: i64::from(barcode_number),
+                amount: Box::new(UnitAmount {
+                    unit: amount_unit_id,
+                    value: i64::from(amount_value),
+                }),
+            },
+        )
+        .await
+        .context("Failed to associated barcode")?,
+
+        ProductCommand::List {} => {
+            let all = products(config)
+                .await
+                .context("Failed to get all products")?;
+
+            for product in all {
+                print!("{}: {}", product.name, product.id);
+
+                if let Some(description) = product
+                    .description
+                    .expect("Superflous Option wrapping in api")
+                {
+                    println!(" ({description})");
+                } else {
+                    println!();
+                }
+
+                for barcode in product.associated_bar_codes {
+                    let unit = unit_by_id(config, barcode.amount.unit.to_string().as_str()).await?;
+
+                    println!(
+                        "  - {}: {} {}",
+                        barcode.id,
+                        barcode.amount.value,
+                        if barcode.amount.value == 1 {
+                            unit.full_name_singular
+                        } else {
+                            unit.full_name_plural
+                        }
+                    );
+                }
+            }
+        }
+    }
+    Ok(())
+}
+
+pub(crate) async fn unit(config: &Configuration, command: UnitCommand) -> Result<()> {
+    match command {
+        UnitCommand::Register {
+            full_name_singular,
+            full_name_plural,
+            short_name,
+            description,
+        } => {
+            let new_id = register_unit(
+                config,
+                UnitStub {
+                    description: Some(description),
+                    full_name_plural,
+                    full_name_singular,
+                    short_name,
+                },
+            )
+            .await
+            .context("Failed to register unit")?;
+            println!("Registered new unit with id: {new_id}");
+        }
+        UnitCommand::List {} => {
+            let all = units(config).await.context("Failed to get all products")?;
+
+            for unit in all {
+                print!("{}: {}", unit.full_name_singular, unit.id);
+
+                if let Some(description) =
+                    unit.description.expect("Superflous Option wrapping in api")
+                {
+                    println!(" ({description})");
+                } else {
+                    println!();
+                }
+            }
+        }
+        UnitCommand::GetById { id } => {
+            let unit = unit_by_id(config, id.to_string().as_str())
+                .await
+                .context("Failed to find unit")?;
+            println!(
+                "Unit: {} ({},{},{})",
+                unit.id, unit.full_name_singular, unit.full_name_plural, unit.short_name
+            );
+        }
+    }
+
+    Ok(())
+}
diff --git a/crates/rocie-cli/src/main.rs b/crates/rocie-cli/src/main.rs
index f0192d4..ef81ad9 100644
--- a/crates/rocie-cli/src/main.rs
+++ b/crates/rocie-cli/src/main.rs
@@ -1,17 +1,11 @@
-use anyhow::{Context, Result};
+use anyhow::Result;
 use clap::Parser;
-use rocie_client::{
-    apis::{
-        api_get_api::{product_by_id, products},
-        api_set_api::{associate_barcode, register_product},
-        configuration::Configuration,
-    },
-    models::{Barcode, UnitAmount},
-};
+use rocie_client::apis::configuration::Configuration;
 
-use crate::cli::{CliArgs, Command, ProductCommand};
+use crate::cli::{CliArgs, Command};
 
 mod cli;
+mod handle;
 
 #[tokio::main]
 async fn main() -> Result<()> {
@@ -21,62 +15,8 @@ async fn main() -> Result<()> {
     "http://127.0.0.1:8080".clone_into(&mut config.base_path);
 
     match args.command {
-        Command::Product { command } => {
-            match command {
-                ProductCommand::Register {
-                    name,
-                    description,
-                    parent,
-                } => {
-                    let new_id = register_product(
-                        &config,
-                        rocie_client::models::ProductStub {
-                            description: Some(description), // TODO: Fix
-                            name,
-                            parent,
-                        },
-                    )
-                    .await
-                    .context("Failed to register new product")?;
-
-                    println!("Registered new product with id: {new_id}");
-                }
-                ProductCommand::Get { id } => {
-                    let product = product_by_id(&config, id.to_string().as_str())
-                        .await
-                        .with_context(|| format!("Failed to get product with id: {id}"))?;
-
-                    println!("{product:#?}");
-                }
-                ProductCommand::AssociateBarcode {
-                    product_id,
-                    barcode_number,
-                    amount_value,
-                    amount_unit,
-                } => associate_barcode(
-                    &config,
-                    product_id.to_string().as_str(),
-                    Barcode {
-                        amount: Box::new(UnitAmount {
-                            unit: amount_unit,
-                            value: amount_value as i32,
-                        }),
-                        id: barcode_number as i32,
-                    },
-                )
-                .await
-                .context("Failed to associated barcode")?,
-                ProductCommand::List {} => {
-                    let all = products(&config)
-                        .await
-                        .context("Failed to get all products")?;
-
-                    for product in all {
-                        println!("{}: {}", product.name, product.id);
-                    }
-                }
-            }
-        }
+        Command::Product { command } => handle::product(&config, command).await?,
+        Command::Unit { command } => handle::unit(&config, command).await?,
     }
 
     Ok(())
diff --git a/crates/rocie-client/.openapi-generator/FILES b/crates/rocie-client/.openapi-generator/FILES
index f9b70e6..01b279c 100644
--- a/crates/rocie-client/.openapi-generator/FILES
+++ b/crates/rocie-client/.openapi-generator/FILES
@@ -1,15 +1,21 @@
 .gitignore
 .travis.yml
 README.md
-docs/ApiGetApi.md
-docs/ApiSetApi.md
+docs/ApiGetProductApi.md
+docs/ApiGetUnitApi.md
+docs/ApiSetProductApi.md
+docs/ApiSetUnitApi.md
 docs/Barcode.md
 docs/Product.md
 docs/ProductStub.md
+docs/Unit.md
 docs/UnitAmount.md
+docs/UnitStub.md
 git_push.sh
-src/apis/api_get_api.rs
-src/apis/api_set_api.rs
+src/apis/api_get_product_api.rs
+src/apis/api_get_unit_api.rs
+src/apis/api_set_product_api.rs
+src/apis/api_set_unit_api.rs
 src/apis/configuration.rs
 src/apis/mod.rs
 src/lib.rs
@@ -17,4 +23,6 @@ src/models/barcode.rs
 src/models/mod.rs
 src/models/product.rs
 src/models/product_stub.rs
+src/models/unit.rs
 src/models/unit_amount.rs
+src/models/unit_stub.rs
diff --git a/crates/rocie-client/README.md b/crates/rocie-client/README.md
index 7649325..26bacb1 100644
--- a/crates/rocie-client/README.md
+++ b/crates/rocie-client/README.md
@@ -26,10 +26,13 @@ All URIs are relative to *http://localhost*
 
 Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
-*ApiGetApi* | [**product_by_id**](docs/ApiGetApi.md#product_by_id) | **GET** /product/{id} | Get Product by id
-*ApiGetApi* | [**products**](docs/ApiGetApi.md#products) | **GET** /products/ | Return all registered products
-*ApiSetApi* | [**associate_barcode**](docs/ApiSetApi.md#associate_barcode) | **POST** /product/{id}/associate | Associate a barcode with a product
-*ApiSetApi* | [**register_product**](docs/ApiSetApi.md#register_product) | **POST** /product/new | Register a product
+*ApiGetProductApi* | [**product_by_id**](docs/ApiGetProductApi.md#product_by_id) | **GET** /product/{id} | Get Product by id
+*ApiGetProductApi* | [**products**](docs/ApiGetProductApi.md#products) | **GET** /products/ | Return all registered products
+*ApiGetUnitApi* | [**unit_by_id**](docs/ApiGetUnitApi.md#unit_by_id) | **GET** /unit/{id} | Get Unit by id
+*ApiGetUnitApi* | [**units**](docs/ApiGetUnitApi.md#units) | **GET** /units/ | Return all registered units
+*ApiSetProductApi* | [**associate_barcode**](docs/ApiSetProductApi.md#associate_barcode) | **POST** /product/{id}/associate | Associate a barcode with a product
+*ApiSetProductApi* | [**register_product**](docs/ApiSetProductApi.md#register_product) | **POST** /product/new | Register a product
+*ApiSetUnitApi* | [**register_unit**](docs/ApiSetUnitApi.md#register_unit) | **POST** /unit/new | Register an Unit
 
 
 ## Documentation For Models
@@ -37,7 +40,9 @@ Class | Method | HTTP request | Description
  - [Barcode](docs/Barcode.md)
  - [Product](docs/Product.md)
  - [ProductStub](docs/ProductStub.md)
+ - [Unit](docs/Unit.md)
  - [UnitAmount](docs/UnitAmount.md)
+ - [UnitStub](docs/UnitStub.md)
 
 
 To get access to the crate's generated documentation, use:
diff --git a/crates/rocie-client/docs/ApiGetApi.md b/crates/rocie-client/docs/ApiGetApi.md
index f2df94c..1ecfb75 100644
--- a/crates/rocie-client/docs/ApiGetApi.md
+++ b/crates/rocie-client/docs/ApiGetApi.md
@@ -32,7 +32,7 @@ No authorization required
 ### HTTP request headers
 
 - **Content-Type**: Not defined
-- **Accept**: application/json
+- **Accept**: application/json, text/plain
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
@@ -57,7 +57,7 @@ No authorization required
 ### HTTP request headers
 
 - **Content-Type**: Not defined
-- **Accept**: application/json
+- **Accept**: application/json, text/plain
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
diff --git a/crates/rocie-client/docs/ApiGetProductApi.md b/crates/rocie-client/docs/ApiGetProductApi.md
new file mode 100644
index 0000000..58955c6
--- /dev/null
+++ b/crates/rocie-client/docs/ApiGetProductApi.md
@@ -0,0 +1,63 @@
+# \ApiGetProductApi
+
+All URIs are relative to *http://localhost*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**product_by_id**](ApiGetProductApi.md#product_by_id) | **GET** /product/{id} | Get Product by id
+[**products**](ApiGetProductApi.md#products) | **GET** /products/ | Return all registered products
+
+
+
+## product_by_id
+
+> models::Product product_by_id(id)
+Get Product by id
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**id** | **uuid::Uuid** | Product id | [required] |
+
+### Return type
+
+[**models::Product**](Product.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: application/json, text/plain
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
+## products
+
+> Vec<models::Product> products()
+Return all registered products
+
+### Parameters
+
+This endpoint does not need any parameter.
+
+### Return type
+
+[**Vec<models::Product>**](Product.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: application/json, text/plain
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
diff --git a/crates/rocie-client/docs/ApiGetUnitApi.md b/crates/rocie-client/docs/ApiGetUnitApi.md
new file mode 100644
index 0000000..3ac44c0
--- /dev/null
+++ b/crates/rocie-client/docs/ApiGetUnitApi.md
@@ -0,0 +1,63 @@
+# \ApiGetUnitApi
+
+All URIs are relative to *http://localhost*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**unit_by_id**](ApiGetUnitApi.md#unit_by_id) | **GET** /unit/{id} | Get Unit by id
+[**units**](ApiGetUnitApi.md#units) | **GET** /units/ | Return all registered units
+
+
+
+## unit_by_id
+
+> models::Unit unit_by_id(id)
+Get Unit by id
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**id** | **uuid::Uuid** | Unit id | [required] |
+
+### Return type
+
+[**models::Unit**](Unit.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: application/json, text/plain
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
+## units
+
+> Vec<models::Unit> units()
+Return all registered units
+
+### Parameters
+
+This endpoint does not need any parameter.
+
+### Return type
+
+[**Vec<models::Unit>**](Unit.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: application/json, text/plain
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
diff --git a/crates/rocie-client/docs/ApiSetApi.md b/crates/rocie-client/docs/ApiSetApi.md
index 87f88b8..6129e50 100644
--- a/crates/rocie-client/docs/ApiSetApi.md
+++ b/crates/rocie-client/docs/ApiSetApi.md
@@ -33,7 +33,7 @@ No authorization required
 ### HTTP request headers
 
 - **Content-Type**: application/json
-- **Accept**: Not defined
+- **Accept**: text/plain
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
@@ -61,7 +61,7 @@ No authorization required
 ### HTTP request headers
 
 - **Content-Type**: application/json
-- **Accept**: application/json
+- **Accept**: application/json, text/plain
 
 [[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
 
diff --git a/crates/rocie-client/docs/ApiSetProductApi.md b/crates/rocie-client/docs/ApiSetProductApi.md
new file mode 100644
index 0000000..6166887
--- /dev/null
+++ b/crates/rocie-client/docs/ApiSetProductApi.md
@@ -0,0 +1,67 @@
+# \ApiSetProductApi
+
+All URIs are relative to *http://localhost*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**associate_barcode**](ApiSetProductApi.md#associate_barcode) | **POST** /product/{id}/associate | Associate a barcode with a product
+[**register_product**](ApiSetProductApi.md#register_product) | **POST** /product/new | Register a product
+
+
+
+## associate_barcode
+
+> associate_barcode(id, barcode)
+Associate a barcode with a product
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**id** | **uuid::Uuid** | The id of the product to associated the barcode with | [required] |
+**barcode** | [**Barcode**](Barcode.md) |  | [required] |
+
+### Return type
+
+ (empty response body)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: text/plain
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
+
+## register_product
+
+> uuid::Uuid register_product(product_stub)
+Register a product
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**product_stub** | [**ProductStub**](ProductStub.md) |  | [required] |
+
+### Return type
+
+[**uuid::Uuid**](uuid::Uuid.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json, text/plain
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
diff --git a/crates/rocie-client/docs/ApiSetUnitApi.md b/crates/rocie-client/docs/ApiSetUnitApi.md
new file mode 100644
index 0000000..6d6d397
--- /dev/null
+++ b/crates/rocie-client/docs/ApiSetUnitApi.md
@@ -0,0 +1,37 @@
+# \ApiSetUnitApi
+
+All URIs are relative to *http://localhost*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**register_unit**](ApiSetUnitApi.md#register_unit) | **POST** /unit/new | Register an Unit
+
+
+
+## register_unit
+
+> uuid::Uuid register_unit(unit_stub)
+Register an Unit
+
+### Parameters
+
+
+Name | Type | Description  | Required | Notes
+------------- | ------------- | ------------- | ------------- | -------------
+**unit_stub** | [**UnitStub**](UnitStub.md) |  | [required] |
+
+### Return type
+
+[**uuid::Uuid**](uuid::Uuid.md)
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+- **Content-Type**: application/json
+- **Accept**: application/json, text/plain
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
diff --git a/crates/rocie-client/docs/Barcode.md b/crates/rocie-client/docs/Barcode.md
index 7e6f4fb..d9734fa 100644
--- a/crates/rocie-client/docs/Barcode.md
+++ b/crates/rocie-client/docs/Barcode.md
@@ -5,7 +5,7 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **amount** | [**models::UnitAmount**](UnitAmount.md) |  | 
-**id** | **i32** |  | 
+**id** | **i64** |  | 
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
 
diff --git a/crates/rocie-client/docs/Unit.md b/crates/rocie-client/docs/Unit.md
new file mode 100644
index 0000000..9fb95a5
--- /dev/null
+++ b/crates/rocie-client/docs/Unit.md
@@ -0,0 +1,15 @@
+# Unit
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**description** | Option<**String**> |  | [optional]
+**full_name_plural** | **String** |  | 
+**full_name_singular** | **String** |  | 
+**id** | [**uuid::Uuid**](uuid::Uuid.md) |  | 
+**short_name** | **String** |  | 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
diff --git a/crates/rocie-client/docs/UnitAmount.md b/crates/rocie-client/docs/UnitAmount.md
index 39b2264..f0c1b5f 100644
--- a/crates/rocie-client/docs/UnitAmount.md
+++ b/crates/rocie-client/docs/UnitAmount.md
@@ -4,8 +4,8 @@
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**unit** | **String** |  | 
-**value** | **i32** |  | 
+**unit** | [**uuid::Uuid**](uuid::Uuid.md) |  | 
+**value** | **i64** |  | 
 
 [[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
 
diff --git a/crates/rocie-client/docs/UnitStub.md b/crates/rocie-client/docs/UnitStub.md
new file mode 100644
index 0000000..62ab220
--- /dev/null
+++ b/crates/rocie-client/docs/UnitStub.md
@@ -0,0 +1,14 @@
+# UnitStub
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**description** | Option<**String**> |  | [optional]
+**full_name_plural** | **String** |  | 
+**full_name_singular** | **String** |  | 
+**short_name** | **String** |  | 
+
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+
diff --git a/crates/rocie-client/src/apis/api_get_api.rs b/crates/rocie-client/src/apis/api_get_api.rs
index 3217717..a8f4c17 100644
--- a/crates/rocie-client/src/apis/api_get_api.rs
+++ b/crates/rocie-client/src/apis/api_get_api.rs
@@ -20,6 +20,7 @@ use super::{Error, configuration, ContentType};
 #[serde(untagged)]
 pub enum ProductByIdError {
     Status404(),
+    Status500(String),
     UnknownValue(serde_json::Value),
 }
 
@@ -27,6 +28,7 @@ pub enum ProductByIdError {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
 pub enum ProductsError {
+    Status500(String),
     UnknownValue(serde_json::Value),
 }
 
diff --git a/crates/rocie-client/src/apis/api_get_product_api.rs b/crates/rocie-client/src/apis/api_get_product_api.rs
new file mode 100644
index 0000000..a8f4c17
--- /dev/null
+++ b/crates/rocie-client/src/apis/api_get_product_api.rs
@@ -0,0 +1,105 @@
+/*
+ * rocie-server
+ *
+ * An enterprise grocery management system
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * Contact: benedikt.peetz@b-peetz.de
+ * Generated by: https://openapi-generator.tech
+ */
+
+
+use reqwest;
+use serde::{Deserialize, Serialize, de::Error as _};
+use crate::{apis::ResponseContent, models};
+use super::{Error, configuration, ContentType};
+
+
+/// struct for typed errors of method [`product_by_id`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum ProductByIdError {
+    Status404(),
+    Status500(String),
+    UnknownValue(serde_json::Value),
+}
+
+/// struct for typed errors of method [`products`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum ProductsError {
+    Status500(String),
+    UnknownValue(serde_json::Value),
+}
+
+
+pub async fn product_by_id(configuration: &configuration::Configuration, id: &str) -> Result<models::Product, Error<ProductByIdError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_id = id;
+
+    let uri_str = format!("{}/product/{id}", configuration.base_path, id=crate::apis::urlencode(p_id));
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+    let content_type = resp
+        .headers()
+        .get("content-type")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("application/octet-stream");
+    let content_type = super::ContentType::from(content_type);
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        match content_type {
+            ContentType::Json => serde_json::from_str(&content).map_err(Error::from),
+            ContentType::Text => return Err(Error::from(serde_json::Error::custom("Received `text/plain` content type response that cannot be converted to `models::Product`"))),
+            ContentType::Unsupported(unknown_type) => return Err(Error::from(serde_json::Error::custom(format!("Received `{unknown_type}` content type response that cannot be converted to `models::Product`")))),
+        }
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<ProductByIdError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
+pub async fn products(configuration: &configuration::Configuration, ) -> Result<Vec<models::Product>, Error<ProductsError>> {
+
+    let uri_str = format!("{}/products/", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+    let content_type = resp
+        .headers()
+        .get("content-type")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("application/octet-stream");
+    let content_type = super::ContentType::from(content_type);
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        match content_type {
+            ContentType::Json => serde_json::from_str(&content).map_err(Error::from),
+            ContentType::Text => return Err(Error::from(serde_json::Error::custom("Received `text/plain` content type response that cannot be converted to `Vec&lt;models::Product&gt;`"))),
+            ContentType::Unsupported(unknown_type) => return Err(Error::from(serde_json::Error::custom(format!("Received `{unknown_type}` content type response that cannot be converted to `Vec&lt;models::Product&gt;`")))),
+        }
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<ProductsError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
diff --git a/crates/rocie-client/src/apis/api_get_unit_api.rs b/crates/rocie-client/src/apis/api_get_unit_api.rs
new file mode 100644
index 0000000..5895652
--- /dev/null
+++ b/crates/rocie-client/src/apis/api_get_unit_api.rs
@@ -0,0 +1,105 @@
+/*
+ * rocie-server
+ *
+ * An enterprise grocery management system
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * Contact: benedikt.peetz@b-peetz.de
+ * Generated by: https://openapi-generator.tech
+ */
+
+
+use reqwest;
+use serde::{Deserialize, Serialize, de::Error as _};
+use crate::{apis::ResponseContent, models};
+use super::{Error, configuration, ContentType};
+
+
+/// struct for typed errors of method [`unit_by_id`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum UnitByIdError {
+    Status404(),
+    Status500(String),
+    UnknownValue(serde_json::Value),
+}
+
+/// struct for typed errors of method [`units`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum UnitsError {
+    Status500(String),
+    UnknownValue(serde_json::Value),
+}
+
+
+pub async fn unit_by_id(configuration: &configuration::Configuration, id: &str) -> Result<models::Unit, Error<UnitByIdError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_id = id;
+
+    let uri_str = format!("{}/unit/{id}", configuration.base_path, id=crate::apis::urlencode(p_id));
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+    let content_type = resp
+        .headers()
+        .get("content-type")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("application/octet-stream");
+    let content_type = super::ContentType::from(content_type);
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        match content_type {
+            ContentType::Json => serde_json::from_str(&content).map_err(Error::from),
+            ContentType::Text => return Err(Error::from(serde_json::Error::custom("Received `text/plain` content type response that cannot be converted to `models::Unit`"))),
+            ContentType::Unsupported(unknown_type) => return Err(Error::from(serde_json::Error::custom(format!("Received `{unknown_type}` content type response that cannot be converted to `models::Unit`")))),
+        }
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<UnitByIdError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
+pub async fn units(configuration: &configuration::Configuration, ) -> Result<Vec<models::Unit>, Error<UnitsError>> {
+
+    let uri_str = format!("{}/units/", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::GET, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+    let content_type = resp
+        .headers()
+        .get("content-type")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("application/octet-stream");
+    let content_type = super::ContentType::from(content_type);
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        match content_type {
+            ContentType::Json => serde_json::from_str(&content).map_err(Error::from),
+            ContentType::Text => return Err(Error::from(serde_json::Error::custom("Received `text/plain` content type response that cannot be converted to `Vec&lt;models::Unit&gt;`"))),
+            ContentType::Unsupported(unknown_type) => return Err(Error::from(serde_json::Error::custom(format!("Received `{unknown_type}` content type response that cannot be converted to `Vec&lt;models::Unit&gt;`")))),
+        }
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<UnitsError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
diff --git a/crates/rocie-client/src/apis/api_set_api.rs b/crates/rocie-client/src/apis/api_set_api.rs
index 7c0c414..81f029e 100644
--- a/crates/rocie-client/src/apis/api_set_api.rs
+++ b/crates/rocie-client/src/apis/api_set_api.rs
@@ -19,6 +19,9 @@ use super::{Error, configuration, ContentType};
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
 pub enum AssociateBarcodeError {
+    Status403(),
+    Status404(),
+    Status500(String),
     UnknownValue(serde_json::Value),
 }
 
@@ -26,6 +29,7 @@ pub enum AssociateBarcodeError {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
 pub enum RegisterProductError {
+    Status500(String),
     UnknownValue(serde_json::Value),
 }
 
diff --git a/crates/rocie-client/src/apis/api_set_product_api.rs b/crates/rocie-client/src/apis/api_set_product_api.rs
new file mode 100644
index 0000000..0d2679b
--- /dev/null
+++ b/crates/rocie-client/src/apis/api_set_product_api.rs
@@ -0,0 +1,100 @@
+/*
+ * rocie-server
+ *
+ * An enterprise grocery management system
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * Contact: benedikt.peetz@b-peetz.de
+ * Generated by: https://openapi-generator.tech
+ */
+
+
+use reqwest;
+use serde::{Deserialize, Serialize, de::Error as _};
+use crate::{apis::ResponseContent, models};
+use super::{Error, configuration, ContentType};
+
+
+/// struct for typed errors of method [`associate_barcode`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum AssociateBarcodeError {
+    Status403(String),
+    Status404(),
+    Status500(String),
+    UnknownValue(serde_json::Value),
+}
+
+/// struct for typed errors of method [`register_product`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum RegisterProductError {
+    Status500(String),
+    UnknownValue(serde_json::Value),
+}
+
+
+pub async fn associate_barcode(configuration: &configuration::Configuration, id: &str, barcode: models::Barcode) -> Result<(), Error<AssociateBarcodeError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_id = id;
+    let p_barcode = barcode;
+
+    let uri_str = format!("{}/product/{id}/associate", configuration.base_path, id=crate::apis::urlencode(p_id));
+    let mut req_builder = configuration.client.request(reqwest::Method::POST, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+    req_builder = req_builder.json(&p_barcode);
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+
+    if !status.is_client_error() && !status.is_server_error() {
+        Ok(())
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<AssociateBarcodeError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
+pub async fn register_product(configuration: &configuration::Configuration, product_stub: models::ProductStub) -> Result<uuid::Uuid, Error<RegisterProductError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_product_stub = product_stub;
+
+    let uri_str = format!("{}/product/new", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::POST, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+    req_builder = req_builder.json(&p_product_stub);
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+    let content_type = resp
+        .headers()
+        .get("content-type")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("application/octet-stream");
+    let content_type = super::ContentType::from(content_type);
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        match content_type {
+            ContentType::Json => serde_json::from_str(&content).map_err(Error::from),
+            ContentType::Text => return Err(Error::from(serde_json::Error::custom("Received `text/plain` content type response that cannot be converted to `uuid::Uuid`"))),
+            ContentType::Unsupported(unknown_type) => return Err(Error::from(serde_json::Error::custom(format!("Received `{unknown_type}` content type response that cannot be converted to `uuid::Uuid`")))),
+        }
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<RegisterProductError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
diff --git a/crates/rocie-client/src/apis/api_set_unit_api.rs b/crates/rocie-client/src/apis/api_set_unit_api.rs
new file mode 100644
index 0000000..e894fc3
--- /dev/null
+++ b/crates/rocie-client/src/apis/api_set_unit_api.rs
@@ -0,0 +1,63 @@
+/*
+ * rocie-server
+ *
+ * An enterprise grocery management system
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * Contact: benedikt.peetz@b-peetz.de
+ * Generated by: https://openapi-generator.tech
+ */
+
+
+use reqwest;
+use serde::{Deserialize, Serialize, de::Error as _};
+use crate::{apis::ResponseContent, models};
+use super::{Error, configuration, ContentType};
+
+
+/// struct for typed errors of method [`register_unit`]
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum RegisterUnitError {
+    Status500(String),
+    UnknownValue(serde_json::Value),
+}
+
+
+pub async fn register_unit(configuration: &configuration::Configuration, unit_stub: models::UnitStub) -> Result<uuid::Uuid, Error<RegisterUnitError>> {
+    // add a prefix to parameters to efficiently prevent name collisions
+    let p_unit_stub = unit_stub;
+
+    let uri_str = format!("{}/unit/new", configuration.base_path);
+    let mut req_builder = configuration.client.request(reqwest::Method::POST, &uri_str);
+
+    if let Some(ref user_agent) = configuration.user_agent {
+        req_builder = req_builder.header(reqwest::header::USER_AGENT, user_agent.clone());
+    }
+    req_builder = req_builder.json(&p_unit_stub);
+
+    let req = req_builder.build()?;
+    let resp = configuration.client.execute(req).await?;
+
+    let status = resp.status();
+    let content_type = resp
+        .headers()
+        .get("content-type")
+        .and_then(|v| v.to_str().ok())
+        .unwrap_or("application/octet-stream");
+    let content_type = super::ContentType::from(content_type);
+
+    if !status.is_client_error() && !status.is_server_error() {
+        let content = resp.text().await?;
+        match content_type {
+            ContentType::Json => serde_json::from_str(&content).map_err(Error::from),
+            ContentType::Text => return Err(Error::from(serde_json::Error::custom("Received `text/plain` content type response that cannot be converted to `uuid::Uuid`"))),
+            ContentType::Unsupported(unknown_type) => return Err(Error::from(serde_json::Error::custom(format!("Received `{unknown_type}` content type response that cannot be converted to `uuid::Uuid`")))),
+        }
+    } else {
+        let content = resp.text().await?;
+        let entity: Option<RegisterUnitError> = serde_json::from_str(&content).ok();
+        Err(Error::ResponseError(ResponseContent { status, content, entity }))
+    }
+}
+
diff --git a/crates/rocie-client/src/apis/mod.rs b/crates/rocie-client/src/apis/mod.rs
index c3f990f..7daca17 100644
--- a/crates/rocie-client/src/apis/mod.rs
+++ b/crates/rocie-client/src/apis/mod.rs
@@ -111,7 +111,9 @@ impl From<&str> for ContentType {
     }
 }
 
-pub mod api_get_api;
-pub mod api_set_api;
+pub mod api_get_product_api;
+pub mod api_get_unit_api;
+pub mod api_set_product_api;
+pub mod api_set_unit_api;
 
 pub mod configuration;
diff --git a/crates/rocie-client/src/models/barcode.rs b/crates/rocie-client/src/models/barcode.rs
index 7690be2..2b1759a 100644
--- a/crates/rocie-client/src/models/barcode.rs
+++ b/crates/rocie-client/src/models/barcode.rs
@@ -16,11 +16,11 @@ pub struct Barcode {
     #[serde(rename = "amount")]
     pub amount: Box<models::UnitAmount>,
     #[serde(rename = "id")]
-    pub id: i32,
+    pub id: i64,
 }
 
 impl Barcode {
-    pub fn new(amount: models::UnitAmount, id: i32) -> Barcode {
+    pub fn new(amount: models::UnitAmount, id: i64) -> Barcode {
         Barcode {
             amount: Box::new(amount),
             id,
diff --git a/crates/rocie-client/src/models/mod.rs b/crates/rocie-client/src/models/mod.rs
index 6c96c01..42fecc5 100644
--- a/crates/rocie-client/src/models/mod.rs
+++ b/crates/rocie-client/src/models/mod.rs
@@ -4,5 +4,9 @@ pub mod product;
 pub use self::product::Product;
 pub mod product_stub;
 pub use self::product_stub::ProductStub;
+pub mod unit;
+pub use self::unit::Unit;
 pub mod unit_amount;
 pub use self::unit_amount::UnitAmount;
+pub mod unit_stub;
+pub use self::unit_stub::UnitStub;
diff --git a/crates/rocie-client/src/models/unit.rs b/crates/rocie-client/src/models/unit.rs
new file mode 100644
index 0000000..95ec588
--- /dev/null
+++ b/crates/rocie-client/src/models/unit.rs
@@ -0,0 +1,39 @@
+/*
+ * rocie-server
+ *
+ * An enterprise grocery management system
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * Contact: benedikt.peetz@b-peetz.de
+ * Generated by: https://openapi-generator.tech
+ */
+
+use crate::models;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Default, Debug, PartialEq, Serialize, Deserialize)]
+pub struct Unit {
+    #[serde(rename = "description", default, with = "::serde_with::rust::double_option", skip_serializing_if = "Option::is_none")]
+    pub description: Option<Option<String>>,
+    #[serde(rename = "full_name_plural")]
+    pub full_name_plural: String,
+    #[serde(rename = "full_name_singular")]
+    pub full_name_singular: String,
+    #[serde(rename = "id")]
+    pub id: uuid::Uuid,
+    #[serde(rename = "short_name")]
+    pub short_name: String,
+}
+
+impl Unit {
+    pub fn new(full_name_plural: String, full_name_singular: String, id: uuid::Uuid, short_name: String) -> Unit {
+        Unit {
+            description: None,
+            full_name_plural,
+            full_name_singular,
+            id,
+            short_name,
+        }
+    }
+}
+
diff --git a/crates/rocie-client/src/models/unit_amount.rs b/crates/rocie-client/src/models/unit_amount.rs
index 038adb0..3ab482c 100644
--- a/crates/rocie-client/src/models/unit_amount.rs
+++ b/crates/rocie-client/src/models/unit_amount.rs
@@ -14,13 +14,13 @@ use serde::{Deserialize, Serialize};
 #[derive(Clone, Default, Debug, PartialEq, Serialize, Deserialize)]
 pub struct UnitAmount {
     #[serde(rename = "unit")]
-    pub unit: String,
+    pub unit: uuid::Uuid,
     #[serde(rename = "value")]
-    pub value: i32,
+    pub value: i64,
 }
 
 impl UnitAmount {
-    pub fn new(unit: String, value: i32) -> UnitAmount {
+    pub fn new(unit: uuid::Uuid, value: i64) -> UnitAmount {
         UnitAmount {
             unit,
             value,
diff --git a/crates/rocie-client/src/models/unit_stub.rs b/crates/rocie-client/src/models/unit_stub.rs
new file mode 100644
index 0000000..03f81fd
--- /dev/null
+++ b/crates/rocie-client/src/models/unit_stub.rs
@@ -0,0 +1,36 @@
+/*
+ * rocie-server
+ *
+ * An enterprise grocery management system
+ *
+ * The version of the OpenAPI document: 0.1.0
+ * Contact: benedikt.peetz@b-peetz.de
+ * Generated by: https://openapi-generator.tech
+ */
+
+use crate::models;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Default, Debug, PartialEq, Serialize, Deserialize)]
+pub struct UnitStub {
+    #[serde(rename = "description", default, with = "::serde_with::rust::double_option", skip_serializing_if = "Option::is_none")]
+    pub description: Option<Option<String>>,
+    #[serde(rename = "full_name_plural")]
+    pub full_name_plural: String,
+    #[serde(rename = "full_name_singular")]
+    pub full_name_singular: String,
+    #[serde(rename = "short_name")]
+    pub short_name: String,
+}
+
+impl UnitStub {
+    pub fn new(full_name_plural: String, full_name_singular: String, short_name: String) -> UnitStub {
+        UnitStub {
+            description: None,
+            full_name_plural,
+            full_name_singular,
+            short_name,
+        }
+    }
+}
+
diff --git a/crates/rocie-server/src/api/get/mod.rs b/crates/rocie-server/src/api/get/mod.rs
new file mode 100644
index 0000000..ce39076
--- /dev/null
+++ b/crates/rocie-server/src/api/get/mod.rs
@@ -0,0 +1,11 @@
+use actix_web::web;
+
+pub(crate) mod product;
+pub(crate) mod unit;
+
+pub(crate) fn register_paths(cfg: &mut web::ServiceConfig) {
+    cfg.service(product::product_by_id)
+        .service(product::products)
+        .service(unit::units)
+        .service(unit::unit_by_id);
+}
diff --git a/crates/rocie-server/src/api/get.rs b/crates/rocie-server/src/api/get/product.rs
index 94015cf..c496777 100644
--- a/crates/rocie-server/src/api/get.rs
+++ b/crates/rocie-server/src/api/get/product.rs
@@ -5,10 +5,6 @@ use crate::{
     storage::sql::product::{Product, ProductId},
 };
 
-pub(crate) fn register_paths(cfg: &mut web::ServiceConfig) {
-    cfg.service(product_by_id).service(products);
-}
-
 /// Get Product by id
 #[utoipa::path(
     responses(
diff --git a/crates/rocie-server/src/api/get/unit.rs b/crates/rocie-server/src/api/get/unit.rs
new file mode 100644
index 0000000..d006818
--- /dev/null
+++ b/crates/rocie-server/src/api/get/unit.rs
@@ -0,0 +1,41 @@
+use actix_web::{get, web, HttpResponse, Responder, Result};
+
+use crate::{app::App, storage::sql::unit::{Unit, UnitId}};
+
+/// Return all registered units
+#[utoipa::path(
+    responses(
+        (status = OK, description = "All units founds", body = Vec<Unit>),
+        (status = INTERNAL_SERVER_ERROR, description = "Server encountered error", body = String)
+    ),
+)]
+#[get("/units/")]
+pub(crate) async fn units(app: web::Data<App>) -> Result<impl Responder> {
+    let all = Unit::get_all(&app).await?;
+
+    Ok(HttpResponse::Ok().json(all))
+}
+
+/// Get Unit by id
+#[utoipa::path(
+    responses(
+        (status = OK, description = "Unit found from database", body = Unit),
+        (status = NOT_FOUND, description = "Unit not found in database"),
+        (status = INTERNAL_SERVER_ERROR, description = "Server encountered error", body = String)
+    ),
+    params(
+        ("id" = UnitId, description = "Unit id" ),
+    )
+)]
+#[get("/unit/{id}")]
+pub(crate) async fn unit_by_id(
+    app: web::Data<App>,
+    id: web::Path<UnitId>,
+) -> Result<impl Responder> {
+    let id = id.into_inner();
+
+    match Unit::from_id(&app, id).await? {
+        Some(product) => Ok(HttpResponse::Ok().json(product)),
+        None => Ok(HttpResponse::NotFound().finish()),
+    }
+}
diff --git a/crates/rocie-server/src/api/set/mod.rs b/crates/rocie-server/src/api/set/mod.rs
new file mode 100644
index 0000000..8a2a1df
--- /dev/null
+++ b/crates/rocie-server/src/api/set/mod.rs
@@ -0,0 +1,10 @@
+use actix_web::web;
+
+pub(crate) mod product;
+pub(crate) mod unit;
+
+pub(crate) fn register_paths(cfg: &mut web::ServiceConfig) {
+    cfg.service(product::register_product)
+        .service(product::associate_barcode)
+        .service(unit::register_unit);
+}
diff --git a/crates/rocie-server/src/api/set.rs b/crates/rocie-server/src/api/set/product.rs
index 0a6af1b..355f09a 100644
--- a/crates/rocie-server/src/api/set.rs
+++ b/crates/rocie-server/src/api/set/product.rs
@@ -7,6 +7,7 @@ use crate::{
     storage::sql::{
         insert::Operations,
         product::{Barcode, Product, ProductId},
+        unit::Unit,
     },
 };
 
@@ -17,10 +18,6 @@ struct ProductStub {
     parent: Option<ProductId>,
 }
 
-pub(crate) fn register_paths(cfg: &mut web::ServiceConfig) {
-    cfg.service(register_product).service(associate_barcode);
-}
-
 /// Register a product
 #[utoipa::path(
     responses(
@@ -68,6 +65,11 @@ pub(crate) async fn register_product(
             description = "Product id not found in database",
         ),
         (
+            status = FORBIDDEN,
+            description = "Unit used in request has not been registered yet",
+            body = String,
+        ),
+        (
             status = INTERNAL_SERVER_ERROR,
             description = "Server encountered error",
             body = String,
@@ -86,6 +88,14 @@ pub(crate) async fn associate_barcode(
 ) -> Result<impl Responder> {
     let mut ops = Operations::new("associated barcode with product");
 
+    {
+        let units = Unit::get_all(&app).await?;
+        if !units.into_iter().any(|unit| unit.id == barcode.amount.unit) {
+            return Ok(HttpResponse::Forbidden()
+                .body("The used unit has not been registered; it cannot be used.\n"));
+        }
+    }
+
     match Product::from_id(&app, id.into_inner()).await? {
         Some(product) => {
             product.associate_barcode(barcode.into_inner(), &mut ops);
diff --git a/crates/rocie-server/src/api/set/unit.rs b/crates/rocie-server/src/api/set/unit.rs
new file mode 100644
index 0000000..4281e05
--- /dev/null
+++ b/crates/rocie-server/src/api/set/unit.rs
@@ -0,0 +1,49 @@
+use actix_web::{HttpResponse, Responder, Result, post, web};
+use serde::Deserialize;
+use utoipa::ToSchema;
+
+use crate::{app::App, storage::sql::{insert::Operations, unit::{Unit, UnitId}}};
+
+#[derive(Deserialize, ToSchema)]
+struct UnitStub {
+    full_name_plural: String,
+    full_name_singular: String,
+    short_name: String,
+    description: Option<String>,
+}
+
+/// Register an Unit
+#[utoipa::path(
+    responses(
+        (
+            status = 200,
+            description = "Product successfully registered in database",
+            body = UnitId,
+        ),
+        (
+            status = INTERNAL_SERVER_ERROR,
+            description = "Server encountered error",
+            body = String,
+        )
+    ),
+    request_body = UnitStub,
+)]
+#[post("/unit/new")]
+pub(crate) async fn register_unit(
+    app: web::Data<App>,
+    unit: web::Json<UnitStub>,
+) -> Result<impl Responder> {
+    let mut ops = Operations::new("register unit");
+
+    let unit = Unit::register(
+        unit.full_name_singular.clone(),
+        unit.full_name_plural.clone(),
+        unit.short_name.clone(),
+        unit.description.clone(),
+        &mut ops,
+    );
+
+    ops.apply(&app).await?;
+
+    Ok(HttpResponse::Ok().json(unit.id))
+}
diff --git a/crates/rocie-server/src/main.rs b/crates/rocie-server/src/main.rs
index 453a2dc..c896c35 100644
--- a/crates/rocie-server/src/main.rs
+++ b/crates/rocie-server/src/main.rs
@@ -18,10 +18,13 @@ async fn main() -> Result<(), std::io::Error> {
     #[derive(OpenApi)]
     #[openapi(
     paths(
-            api::get::product_by_id,
-            api::get::products,
-            api::set::register_product,
-            api::set::associate_barcode
+            api::get::product::product_by_id,
+            api::get::product::products,
+            api::get::unit::units,
+            api::get::unit::unit_by_id,
+            api::set::product::register_product,
+            api::set::product::associate_barcode,
+            api::set::unit::register_unit,
         ),
     // security(
     //     (),
@@ -49,7 +52,7 @@ async fn main() -> Result<(), std::io::Error> {
 
             HttpServer::new(move || {
                 App::new()
-                    .wrap(Logger::default())
+                    .wrap(Logger::new(r#"%a "%r" -> %s %b ("%{Referer}i" "%{User-Agent}i" %T s)"#))
                     .app_data(Data::clone(&data))
                     .configure(api::get::register_paths)
                     .configure(api::set::register_paths)
diff --git a/crates/rocie-server/src/storage/migrate/sql/0->1.sql b/crates/rocie-server/src/storage/migrate/sql/0->1.sql
index 13bc1cb..5aa497d 100644
--- a/crates/rocie-server/src/storage/migrate/sql/0->1.sql
+++ b/crates/rocie-server/src/storage/migrate/sql/0->1.sql
@@ -37,11 +37,15 @@ CREATE TABLE barcodes (
     amount                      INTEGER        NOT NULL,
     unit                        TEXT           NOT NULL,
     FOREIGN KEY(product_id) REFERENCES products(id),
-    FOREIGN KEY(unit) REFERENCES units(name)
+    FOREIGN KEY(unit) REFERENCES units(id)
 ) STRICT;
 
 CREATE TABLE units (
-    name                        TEXT UNIQUE NOT NULL PRIMARY KEY
+    id                          TEXT UNIQUE NOT NULL PRIMARY KEY,
+    full_name_singular          TEXT UNIQUE NOT NULL,
+    full_name_plural            TEXT UNIQUE NOT NULL,
+    short_name                  TEXT UNIQUE NOT NULL,
+    description                 TEXT
 ) STRICT;
 
 -- Encodes unit conversions:
@@ -51,8 +55,8 @@ CREATE TABLE unit_conversions (
     from_unit                  TEXT NOT NULL,
     to_unit                    TEXT NOT NULL,
     factor                     REAL NOT NULL,
-    FOREIGN KEY(from_unit)     REFERENCES units(name),
-    FOREIGN KEY(to_unit)       REFERENCES units(name)
+    FOREIGN KEY(from_unit)     REFERENCES units(id),
+    FOREIGN KEY(to_unit)       REFERENCES units(id)
 ) STRICT;
 
 -- Log of all the applied operations to this db.
diff --git a/crates/rocie-server/src/storage/sql/get/mod.rs b/crates/rocie-server/src/storage/sql/get/mod.rs
index 2268e85..fa22f81 100644
--- a/crates/rocie-server/src/storage/sql/get/mod.rs
+++ b/crates/rocie-server/src/storage/sql/get/mod.rs
@@ -1 +1,2 @@
 pub(crate) mod product;
+pub(crate) mod unit;
diff --git a/crates/rocie-server/src/storage/sql/get/product/mod.rs b/crates/rocie-server/src/storage/sql/get/product/mod.rs
index bcc3e32..d23297a 100644
--- a/crates/rocie-server/src/storage/sql/get/product/mod.rs
+++ b/crates/rocie-server/src/storage/sql/get/product/mod.rs
@@ -1,6 +1,9 @@
 use crate::{
     app::App,
-    storage::sql::product::{Product, ProductId},
+    storage::sql::{
+        product::{Barcode, Product, ProductId, UnitAmount},
+        unit::UnitId,
+    },
 };
 
 use sqlx::query;
@@ -40,17 +43,38 @@ impl Product {
         .fetch_all(&app.db)
         .await?;
 
-        Ok(records
-            .into_iter()
-            .map(|record| {
-                Self {
-                    id: ProductId::from_db(&record.id),
-                    name: record.name,
-                    description: record.description,
-                    associated_bar_codes: vec![], // todo
-                }
-            })
-            .collect())
+        let mut all = Vec::with_capacity(records.len());
+        for record in records {
+            let barcodes = query!(
+                "
+                SELECT id, amount, unit
+                FROM barcodes
+                WHERE product_id = ?
+",
+                record.id,
+            )
+            .fetch_all(&app.db)
+            .await?;
+
+            all.push(Self {
+                id: ProductId::from_db(&record.id),
+                name: record.name,
+                description: record.description,
+                associated_bar_codes: barcodes
+                    .into_iter()
+                    .map(|record| Barcode {
+                        id: u32::try_from(record.id).expect("Should be strictly positive"),
+                        amount: UnitAmount {
+                            value: u32::try_from(record.amount)
+                                .expect("Should be strictly positve"),
+                            unit: UnitId::from_db(&record.unit),
+                        },
+                    })
+                    .collect(),
+            });
+        }
+
+        Ok(all)
     }
 }
 
@@ -63,8 +87,7 @@ pub(crate) mod from_id {
         SqlError(#[from] sqlx::Error),
     }
 
-    impl ResponseError for Error {
-    }
+    impl ResponseError for Error {}
 }
 
 pub(crate) mod get_all {
@@ -76,6 +99,5 @@ pub(crate) mod get_all {
         SqlError(#[from] sqlx::Error),
     }
 
-    impl ResponseError for Error {
-    }
+    impl ResponseError for Error {}
 }
diff --git a/crates/rocie-server/src/storage/sql/get/unit/mod.rs b/crates/rocie-server/src/storage/sql/get/unit/mod.rs
new file mode 100644
index 0000000..6c2bbcc
--- /dev/null
+++ b/crates/rocie-server/src/storage/sql/get/unit/mod.rs
@@ -0,0 +1,79 @@
+use crate::{
+    app::App,
+    storage::sql::unit::{Unit, UnitId},
+};
+
+use sqlx::query;
+
+impl Unit {
+    pub(crate) async fn get_all(app: &App) -> Result<Vec<Self>, get_all::Error> {
+        let records = query!(
+            "
+        SELECT id, full_name_singular, full_name_plural, short_name, description
+        FROM units
+"
+        )
+        .fetch_all(&app.db)
+        .await?;
+
+        Ok(records
+            .into_iter()
+            .map(|record| Self {
+                id: UnitId::from_db(&record.id),
+                full_name_singular: record.full_name_singular,
+                full_name_plural: record.full_name_plural,
+                short_name: record.short_name,
+                description: record.description,
+            })
+            .collect())
+    }
+
+    pub(crate) async fn from_id(app: &App, id: UnitId) -> Result<Option<Self>, from_id::Error> {
+        let record = query!(
+            "
+        SELECT full_name_singular, full_name_plural, short_name, description
+        FROM units
+        WHERE id = ?
+",
+            id
+        )
+        .fetch_optional(&app.db)
+        .await?;
+
+        if let Some(record) = record {
+            Ok(Some(Self {
+                id,
+                full_name_singular: record.full_name_singular,
+                full_name_plural: record.full_name_plural,
+                short_name: record.short_name,
+                description: record.description,
+            }))
+        } else {
+            Ok(None)
+        }
+    }
+}
+
+pub(crate) mod get_all {
+    use actix_web::ResponseError;
+
+    #[derive(thiserror::Error, Debug)]
+    pub(crate) enum Error {
+        #[error("Failed to execute the sql query")]
+        SqlError(#[from] sqlx::Error),
+    }
+
+    impl ResponseError for Error {}
+}
+
+pub(crate) mod from_id {
+    use actix_web::ResponseError;
+
+    #[derive(thiserror::Error, Debug)]
+    pub(crate) enum Error {
+        #[error("Failed to execute the sql query")]
+        SqlError(#[from] sqlx::Error),
+    }
+
+    impl ResponseError for Error {}
+}
diff --git a/crates/rocie-server/src/storage/sql/insert/mod.rs b/crates/rocie-server/src/storage/sql/insert/mod.rs
index 99f1e71..eec6ad2 100644
--- a/crates/rocie-server/src/storage/sql/insert/mod.rs
+++ b/crates/rocie-server/src/storage/sql/insert/mod.rs
@@ -8,6 +8,7 @@ use serde::{Serialize, de::DeserializeOwned};
 use sqlx::{SqliteConnection, query};
 
 pub(crate) mod product;
+pub(crate) mod unit;
 
 pub(crate) trait Transactionable:
     Sized + std::fmt::Debug + Serialize + DeserializeOwned
@@ -77,7 +78,8 @@ impl<O: Transactionable> Operations<O> {
 }
 
 pub(crate) mod apply {
-    use actix_web::ResponseError;
+    use actix_web::{ResponseError, http::header::HeaderValue};
+    use log::error;
 
     use crate::storage::sql::insert::{Transactionable, add_operations_to_txn_log};
 
@@ -94,7 +96,23 @@ pub(crate) mod apply {
     }
 
     impl<O: Transactionable> ResponseError for Error<O> {
-        // TODO(@bpeetz): Actually do something with this. <2025-09-05>
+        fn status_code(&self) -> actix_web::http::StatusCode {
+            actix_web::http::StatusCode::INTERNAL_SERVER_ERROR
+        }
+
+        fn error_response(&self) -> actix_web::HttpResponse<actix_web::body::BoxBody> {
+            error!("Emmiting `INTERNAL_SERVER_ERROR`: {self}");
+            let mut res =
+                actix_web::HttpResponse::new(self.status_code()).set_body(self.to_string());
+
+            let mime = actix_web::mime::TEXT_PLAIN_UTF_8;
+            res.headers_mut().insert(
+                actix_web::http::header::CONTENT_TYPE,
+                HeaderValue::from_str(mime.to_string().as_str()).expect("Hard-coded conversion"),
+            );
+
+            res.set_body(actix_web::body::BoxBody::new(self.to_string()))
+        }
     }
 }
 
diff --git a/crates/rocie-server/src/storage/sql/insert/product/mod.rs b/crates/rocie-server/src/storage/sql/insert/product/mod.rs
index 562e809..b6dd604 100644
--- a/crates/rocie-server/src/storage/sql/insert/product/mod.rs
+++ b/crates/rocie-server/src/storage/sql/insert/product/mod.rs
@@ -115,14 +115,14 @@ impl Transactionable for Operation {
 pub(crate) mod undo {
     #[derive(thiserror::Error, Debug)]
     pub(crate) enum Error {
-        #[error("Failed to execute sql statments")]
+        #[error("Failed to execute undo sql statments: {0}")]
         SqlError(#[from] sqlx::Error),
     }
 }
 pub(crate) mod apply {
     #[derive(thiserror::Error, Debug)]
     pub(crate) enum Error {
-        #[error("Failed to execute sql statments")]
+        #[error("Failed to execute apply sql statments: {0}")]
         SqlError(#[from] sqlx::Error),
     }
 }
diff --git a/crates/rocie-server/src/storage/sql/insert/unit/mod.rs b/crates/rocie-server/src/storage/sql/insert/unit/mod.rs
new file mode 100644
index 0000000..ba08487
--- /dev/null
+++ b/crates/rocie-server/src/storage/sql/insert/unit/mod.rs
@@ -0,0 +1,110 @@
+use serde::{Deserialize, Serialize};
+use sqlx::query;
+use uuid::Uuid;
+
+use crate::storage::sql::{insert::{Operations, Transactionable}, unit::{Unit, UnitId}};
+
+#[derive(Debug, Deserialize, Serialize)]
+pub(crate) enum Operation {
+    RegisterUnit {
+        id: UnitId,
+        full_name_singular: String,
+        full_name_plural: String,
+        short_name: String,
+        description: Option<String>,
+    },
+}
+
+impl Transactionable for Operation {
+    type ApplyError = apply::Error;
+    type UndoError = undo::Error;
+
+    async fn apply(self, txn: &mut sqlx::SqliteConnection) -> Result<(), apply::Error> {
+        match self {
+            Operation::RegisterUnit {
+                id,
+                full_name_singular,
+                full_name_plural,
+                short_name,
+                description,
+            } => {
+                query!(
+                    "
+                    INSERT INTO units (id, full_name_singular, full_name_plural, short_name, description)
+                    VALUES (?,?,?,?,?)
+",
+                    id, full_name_singular, full_name_plural, short_name, description,
+                )
+                .execute(txn)
+                .await?;
+            }
+        }
+        Ok(())
+    }
+
+    async fn undo(self, txn: &mut sqlx::SqliteConnection) -> Result<(), undo::Error> {
+        match self {
+            Operation::RegisterUnit {
+                id,
+                full_name_singular,
+                full_name_plural,
+                short_name,
+                description,
+            } => {
+                query!(
+                    "
+                    DELETE FROM units
+                    WHERE id = ? AND full_name_singular = ? AND full_name_plural = ? AND short_name = ? AND description = ?;
+",
+                    id, full_name_singular, full_name_plural, short_name, description,
+                )
+                .execute(txn)
+                .await?;
+            }
+        }
+        Ok(())
+    }
+}
+
+pub(crate) mod undo {
+    #[derive(thiserror::Error, Debug)]
+    pub(crate) enum Error {
+        #[error("Failed to execute undo sql statments: {0}")]
+        SqlError(#[from] sqlx::Error),
+    }
+}
+pub(crate) mod apply {
+    #[derive(thiserror::Error, Debug)]
+    pub(crate) enum Error {
+        #[error("Failed to execute apply sql statments: {0}")]
+        SqlError(#[from] sqlx::Error),
+    }
+}
+
+impl Unit {
+    pub(crate) fn register(
+        full_name_singular: String,
+        full_name_plural: String,
+        short_name: String,
+        description: Option<String>,
+        ops: &mut Operations<Operation>,
+    ) -> Self {
+        let id = UnitId::from(Uuid::new_v4());
+
+        ops.push(Operation::RegisterUnit {
+            id,
+            full_name_singular: full_name_singular.clone(),
+            full_name_plural: full_name_plural.clone(),
+            short_name: short_name.clone(),
+            description: description.clone(),
+        });
+
+        Self {
+            id,
+            full_name_singular,
+            full_name_plural,
+            short_name,
+            description,
+        }
+    }
+}
diff --git a/crates/rocie-server/src/storage/sql/mod.rs b/crates/rocie-server/src/storage/sql/mod.rs
index 871ae3b..f5ad88a 100644
--- a/crates/rocie-server/src/storage/sql/mod.rs
+++ b/crates/rocie-server/src/storage/sql/mod.rs
@@ -3,3 +3,4 @@ pub(crate) mod insert;
 
 // Types
 pub(crate) mod product;
+pub(crate) mod unit;
diff --git a/crates/rocie-server/src/storage/sql/product.rs b/crates/rocie-server/src/storage/sql/product.rs
index e0216dd..e2a4f0d 100644
--- a/crates/rocie-server/src/storage/sql/product.rs
+++ b/crates/rocie-server/src/storage/sql/product.rs
@@ -5,6 +5,8 @@ use sqlx::{Database, Encode, Type};
 use utoipa::ToSchema;
 use uuid::Uuid;
 
+use crate::storage::sql::unit::{Unit, UnitId};
+
 #[derive(Clone, ToSchema, Serialize, Deserialize)]
 pub(crate) struct Product {
     pub(crate) id: ProductId,
@@ -59,12 +61,14 @@ where
 
 #[derive(ToSchema, Debug, Clone, Serialize, Deserialize)]
 pub(crate) struct Barcode {
+    #[schema(format = Int64, minimum = 0)]
     pub(crate) id: u32,
     pub(crate) amount: UnitAmount,
 }
 
 #[derive(ToSchema, Debug, Clone, Serialize, Deserialize)]
 pub(crate) struct UnitAmount {
+    #[schema(format = Int64, minimum = 0)]
     pub(crate) value: u32,
-    pub(crate) unit: String,
+    pub(crate) unit: UnitId,
 }
diff --git a/crates/rocie-server/src/storage/sql/unit.rs b/crates/rocie-server/src/storage/sql/unit.rs
new file mode 100644
index 0000000..fe00b1b
--- /dev/null
+++ b/crates/rocie-server/src/storage/sql/unit.rs
@@ -0,0 +1,59 @@
+use std::{fmt::Display, str::FromStr};
+
+use serde::{Deserialize, Serialize};
+use sqlx::{Database, Encode, Type};
+use utoipa::ToSchema;
+use uuid::Uuid;
+
+#[derive(ToSchema, Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Serialize, Deserialize)]
+pub(crate) struct Unit {
+    pub(crate) id: UnitId,
+    pub(crate) full_name_singular: String,
+    pub(crate) full_name_plural: String,
+    pub(crate) short_name: String,
+    pub(crate) description: Option<String>,
+}
+
+#[derive(
+    Deserialize, Serialize, Debug, Default, ToSchema, Clone, Copy, PartialEq, Eq, PartialOrd, Ord,
+)]
+pub(crate) struct UnitId(Uuid);
+
+impl UnitId {
+    pub(crate) fn from_db(id: &str) -> UnitId {
+        Self(Uuid::from_str(id).expect("We put an uuid into the db, it should also go out again"))
+    }
+}
+
+impl Display for UnitId {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+impl From<Uuid> for UnitId {
+    fn from(value: Uuid) -> Self {
+        Self(value)
+    }
+}
+
+impl<'q, DB: Database> Encode<'q, DB> for UnitId
+where
+    String: Encode<'q, DB>,
+{
+    fn encode_by_ref(
+        &self,
+        buf: &mut <DB as Database>::ArgumentBuffer<'q>,
+    ) -> Result<sqlx::encode::IsNull, sqlx::error::BoxDynError> {
+        let inner = self.0.to_string();
+        Encode::<DB>::encode_by_ref(&inner, buf)
+    }
+}
+impl<DB: Database> Type<DB> for UnitId
+where
+    String: Type<DB>,
+{
+    fn type_info() -> DB::TypeInfo {
+        <String as Type<DB>>::type_info()
+    }
+}