diff --git a/backend/src/lib/outbound/postgres.rs b/backend/src/lib/outbound/postgres/auth.rs
similarity index 80%
rename from backend/src/lib/outbound/postgres.rs
rename to backend/src/lib/outbound/postgres/auth.rs
index 71cc8dd..e79bc2c 100644
--- a/backend/src/lib/outbound/postgres.rs
+++ b/backend/src/lib/outbound/postgres/auth.rs
@@ -1,18 +1,13 @@
-use std::str::FromStr;
-
-use anyhow::{Context, anyhow};
+use anyhow::{Context as _, anyhow};
 use argon2::{
-    Argon2, PasswordHash, PasswordVerifier,
+    Argon2, PasswordHash, PasswordVerifier as _,
     password_hash::{
-        PasswordHasher, SaltString,
+        PasswordHasher as _, SaltString,
         rand_core::{OsRng, RngCore as _},
     },
 };
 use chrono::Utc;
-use sqlx::{
-    ConnectOptions as _, Connection as _, PgConnection, PgPool,
-    postgres::{PgConnectOptions, PgPoolOptions},
-};
+use sqlx::{Acquire as _, PgConnection};
 use uuid::Uuid;
 
 use crate::domain::warren::{
@@ -39,128 +34,312 @@ use crate::domain::warren::{
                 FetchUserWarrensRequest, ListUserWarrensError, ListUserWarrensRequest,
             },
         },
-        warren::{
-            FetchWarrenError, FetchWarrenRequest, FetchWarrensError, FetchWarrensRequest,
-            ListWarrensError, ListWarrensRequest, Warren,
-        },
+        warren::ListWarrensRequest,
     },
-    ports::{AuthRepository, WarrenRepository, WarrenService},
+    ports::{AuthRepository, WarrenService},
 };
 
-#[derive(Debug, Clone)]
-pub struct PostgresConfig {
-    database_url: String,
-    database_name: String,
-}
+use super::{Postgres, is_not_found_error};
 
-impl PostgresConfig {
-    pub fn new(database_url: String, database_name: String) -> Self {
-        Self {
-            database_url,
-            database_name,
-        }
+impl AuthRepository for Postgres {
+    async fn create_user(&self, request: CreateUserRequest) -> Result<User, CreateUserError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let user = self
+            .create_user(
+                &mut connection,
+                request.name(),
+                request.email(),
+                request.password(),
+                request.admin(),
+            )
+            .await
+            .context(format!("Failed to create user"))?;
+
+        Ok(user)
     }
-}
 
-#[derive(Debug, Clone)]
-pub struct Postgres {
-    pool: PgPool,
+    async fn edit_user(&self, request: EditUserRequest) -> Result<User, EditUserError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let user = self
+            .edit_user(
+                &mut connection,
+                request.user_id(),
+                request.name(),
+                request.email(),
+                request.password(),
+                request.admin(),
+            )
+            .await
+            .context(format!("Failed to edit user"))?;
+
+        Ok(user)
+    }
+
+    async fn delete_user(&self, request: DeleteUserRequest) -> Result<User, DeleteUserError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        self.delete_user_from_database(&mut connection, request.user_id())
+            .await
+            .map_err(|e| {
+                if is_not_found_error(&e) {
+                    DeleteUserError::NotFound
+                } else {
+                    DeleteUserError::Unknown(anyhow!(e))
+                }
+            })
+    }
+
+    async fn verify_user_password(
+        &self,
+        request: VerifyUserPasswordRequest,
+    ) -> Result<User, VerifyUserPasswordError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let user = self
+            .get_user_from_email(&mut connection, request.email())
+            .await
+            .map_err(|e| {
+                if is_not_found_error(&e) {
+                    VerifyUserPasswordError::NotFound(request.email().clone())
+                } else {
+                    VerifyUserPasswordError::Unknown(anyhow!(e))
+                }
+            })?;
+
+        self.check_user_password_against_hash(request.password(), user.password_hash())?;
+
+        Ok(user)
+    }
+
+    async fn create_auth_session(
+        &self,
+        request: CreateAuthSessionRequest,
+    ) -> Result<AuthSession, CreateAuthSessionError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let session = self
+            .create_session(&mut connection, request.user(), request.expiration())
+            .await
+            .context("Failed to create session")?;
+
+        Ok(session)
+    }
+
+    async fn fetch_auth_session(
+        &self,
+        request: FetchAuthSessionRequest,
+    ) -> Result<FetchAuthSessionResponse, FetchAuthSessionError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let session = self
+            .get_auth_session(&mut connection, request.session_id())
+            .await
+            .map_err(|e| {
+                if is_not_found_error(&e) {
+                    FetchAuthSessionError::NotFound
+                } else {
+                    anyhow!("Failed to get auth session: {e:?}").into()
+                }
+            })?;
+        let user = self
+            .get_user_from_id(&mut connection, session.user_id())
+            .await
+            .context("Failed to get user")?;
+
+        Ok(FetchAuthSessionResponse::new(session, user))
+    }
+
+    async fn create_user_warren(
+        &self,
+        request: CreateUserWarrenRequest,
+    ) -> Result<UserWarren, CreateUserWarrenError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let user_warren = self
+            .add_user_to_warren(&mut connection, request.user_warren())
+            .await
+            .context("Failed to create user warren")?;
+
+        Ok(user_warren)
+    }
+
+    async fn edit_user_warren(
+        &self,
+        request: EditUserWarrenRequest,
+    ) -> Result<UserWarren, EditUserWarrenError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let user_warren = self
+            .update_user_warren(&mut connection, request.user_warren())
+            .await
+            .context("Failed to edit user warren")?;
+
+        Ok(user_warren)
+    }
+
+    async fn delete_user_warren(
+        &self,
+        request: DeleteUserWarrenRequest,
+    ) -> Result<UserWarren, DeleteUserWarrenError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let user_warren = self
+            .remove_user_from_warren(&mut connection, request.user_id(), request.warren_id())
+            .await
+            .map_err(|e| {
+                if is_not_found_error(&e) {
+                    DeleteUserWarrenError::NotFound
+                } else {
+                    anyhow!("Failed to delete user warren: {e:?}").into()
+                }
+            })?;
+
+        Ok(user_warren)
+    }
+
+    async fn fetch_user_warrens(
+        &self,
+        request: FetchUserWarrensRequest,
+    ) -> Result<Vec<UserWarren>, FetchUserWarrensError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let user_warrens = self
+            .get_user_warrens(&mut connection, request.user_id())
+            .await
+            .context("Failed to get user warrens")?;
+
+        Ok(user_warrens)
+    }
+
+    async fn list_user_warrens(
+        &self,
+        _request: ListUserWarrensRequest,
+    ) -> Result<Vec<UserWarren>, ListUserWarrensError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let user_warrens = self
+            .get_all_user_warrens(&mut connection)
+            .await
+            .context("Failed to get all user warrens")?;
+
+        Ok(user_warrens)
+    }
+
+    async fn fetch_user_warren(
+        &self,
+        request: FetchUserWarrenRequest,
+    ) -> Result<UserWarren, FetchUserWarrenError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        self.get_user_warren(&mut connection, request.user_id(), request.warren_id())
+            .await
+            .map_err(|e| {
+                if is_not_found_error(&e) {
+                    FetchUserWarrenError::NotFound
+                } else {
+                    FetchUserWarrenError::Unknown(anyhow!(e))
+                }
+            })
+    }
+
+    async fn list_users(&self, _request: ListUsersRequest) -> Result<Vec<User>, ListUsersError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let users = self
+            .fetch_users(&mut connection)
+            .await
+            .map_err(|e| anyhow!(e))?;
+
+        Ok(users)
+    }
+
+    async fn list_all_users_and_warrens<WS: WarrenService>(
+        &self,
+        _request: ListAllUsersAndWarrensRequest,
+        warren_service: &WS,
+    ) -> Result<ListAllUsersAndWarrensResponse, ListAllUsersAndWarrensError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let users = self
+            .fetch_users(&mut connection)
+            .await
+            .context("Failed to fetch all users")?;
+        let user_warrens = self
+            .get_all_user_warrens(&mut connection)
+            .await
+            .context("Failed to fetch all user warrens")?;
+        let warrens = warren_service
+            .list_warrens(ListWarrensRequest::new())
+            .await
+            .context("Failed to get all warrens")?;
+
+        Ok(ListAllUsersAndWarrensResponse::new(
+            users,
+            user_warrens,
+            warrens,
+        ))
+    }
 }
 
 impl Postgres {
-    pub async fn new(config: PostgresConfig) -> anyhow::Result<Self> {
-        let opts = PgConnectOptions::from_str(&config.database_url)?.disable_statement_logging();
-
-        let mut connection = PgConnection::connect_with(&opts)
-            .await
-            .context("Failed to connect to the PostgreSQL database")?;
-
-        match sqlx::query("SELECT datname FROM pg_database WHERE datname = $1")
-            .bind(&config.database_name)
-            .fetch_one(&mut connection)
-            .await
-        {
-            Ok(_) => (),
-            Err(sqlx::Error::RowNotFound) => {
-                sqlx::query(&format!("CREATE DATABASE {}", config.database_name))
-                    .execute(&mut connection)
-                    .await?;
-            }
-            Err(e) => return Err(e.into()),
-        };
-
-        connection.close().await?;
-
-        let pool = PgPoolOptions::new()
-            .connect_with(opts.database(&config.database_name))
-            .await?;
-        sqlx::migrate!("./migrations").run(&pool).await?;
-
-        Ok(Self { pool })
-    }
-
-    async fn get_warren(
-        &self,
-        connection: &mut PgConnection,
-        id: &Uuid,
-    ) -> Result<Warren, sqlx::Error> {
-        let warren: Warren = sqlx::query_as(
-            "
-            SELECT
-                *
-            FROM
-                warrens
-            WHERE
-                id = $1
-            ",
-        )
-        .bind(id)
-        .fetch_one(connection)
-        .await?;
-
-        Ok(warren)
-    }
-
-    async fn fetch_warrens(
-        &self,
-        connection: &mut PgConnection,
-        ids: &[Uuid],
-    ) -> Result<Vec<Warren>, sqlx::Error> {
-        let warrens: Vec<Warren> = sqlx::query_as::<sqlx::Postgres, Warren>(
-            "
-            SELECT
-                *
-            FROM
-                warrens
-            WHERE
-                id = ANY($1)
-            ",
-        )
-        .bind(ids)
-        .fetch_all(&mut *connection)
-        .await?;
-
-        Ok(warrens)
-    }
-
-    async fn fetch_all_warrens(
-        &self,
-        connection: &mut PgConnection,
-    ) -> Result<Vec<Warren>, sqlx::Error> {
-        let warrens: Vec<Warren> = sqlx::query_as::<sqlx::Postgres, Warren>(
-            "
-            SELECT
-                *
-            FROM
-                warrens
-            ",
-        )
-        .fetch_all(&mut *connection)
-        .await?;
-
-        Ok(warrens)
-    }
-
     async fn create_user(
         &self,
         connection: &mut PgConnection,
@@ -602,369 +781,6 @@ impl Postgres {
     }
 }
 
-impl WarrenRepository for Postgres {
-    async fn fetch_warrens(
-        &self,
-        request: FetchWarrensRequest,
-    ) -> Result<Vec<Warren>, FetchWarrensError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let warrens = self
-            .fetch_warrens(&mut connection, request.ids())
-            .await
-            .map_err(|err| anyhow!(err).context("Failed to fetch warrens"))?;
-
-        Ok(warrens)
-    }
-
-    async fn list_warrens(
-        &self,
-        _request: ListWarrensRequest,
-    ) -> Result<Vec<Warren>, ListWarrensError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let warrens = self
-            .fetch_all_warrens(&mut connection)
-            .await
-            .map_err(|err| anyhow!(err).context("Failed to list all warrens"))?;
-
-        Ok(warrens)
-    }
-
-    async fn fetch_warren(&self, request: FetchWarrenRequest) -> Result<Warren, FetchWarrenError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let warren = self
-            .get_warren(&mut connection, request.id())
-            .await
-            .map_err(|err| {
-                if is_not_found_error(&err) {
-                    return FetchWarrenError::NotFound(request.id().clone());
-                }
-
-                anyhow!(err)
-                    .context(format!("Failed to fetch warren with id {:?}", request.id()))
-                    .into()
-            })?;
-
-        Ok(warren)
-    }
-}
-
-impl AuthRepository for Postgres {
-    async fn create_user(&self, request: CreateUserRequest) -> Result<User, CreateUserError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let user = self
-            .create_user(
-                &mut connection,
-                request.name(),
-                request.email(),
-                request.password(),
-                request.admin(),
-            )
-            .await
-            .context(format!("Failed to create user"))?;
-
-        Ok(user)
-    }
-
-    async fn edit_user(&self, request: EditUserRequest) -> Result<User, EditUserError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let user = self
-            .edit_user(
-                &mut connection,
-                request.user_id(),
-                request.name(),
-                request.email(),
-                request.password(),
-                request.admin(),
-            )
-            .await
-            .context(format!("Failed to edit user"))?;
-
-        Ok(user)
-    }
-
-    async fn delete_user(&self, request: DeleteUserRequest) -> Result<User, DeleteUserError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        self.delete_user_from_database(&mut connection, request.user_id())
-            .await
-            .map_err(|e| {
-                if is_not_found_error(&e) {
-                    DeleteUserError::NotFound
-                } else {
-                    DeleteUserError::Unknown(anyhow!(e))
-                }
-            })
-    }
-
-    async fn verify_user_password(
-        &self,
-        request: VerifyUserPasswordRequest,
-    ) -> Result<User, VerifyUserPasswordError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let user = self
-            .get_user_from_email(&mut connection, request.email())
-            .await
-            .map_err(|e| {
-                if is_not_found_error(&e) {
-                    VerifyUserPasswordError::NotFound(request.email().clone())
-                } else {
-                    VerifyUserPasswordError::Unknown(anyhow!(e))
-                }
-            })?;
-
-        self.check_user_password_against_hash(request.password(), user.password_hash())?;
-
-        Ok(user)
-    }
-
-    async fn create_auth_session(
-        &self,
-        request: CreateAuthSessionRequest,
-    ) -> Result<AuthSession, CreateAuthSessionError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let session = self
-            .create_session(&mut connection, request.user(), request.expiration())
-            .await
-            .context("Failed to create session")?;
-
-        Ok(session)
-    }
-
-    async fn fetch_auth_session(
-        &self,
-        request: FetchAuthSessionRequest,
-    ) -> Result<FetchAuthSessionResponse, FetchAuthSessionError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let session = self
-            .get_auth_session(&mut connection, request.session_id())
-            .await
-            .map_err(|e| {
-                if is_not_found_error(&e) {
-                    FetchAuthSessionError::NotFound
-                } else {
-                    anyhow!("Failed to get auth session: {e:?}").into()
-                }
-            })?;
-        let user = self
-            .get_user_from_id(&mut connection, session.user_id())
-            .await
-            .context("Failed to get user")?;
-
-        Ok(FetchAuthSessionResponse::new(session, user))
-    }
-
-    async fn create_user_warren(
-        &self,
-        request: CreateUserWarrenRequest,
-    ) -> Result<UserWarren, CreateUserWarrenError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let user_warren = self
-            .add_user_to_warren(&mut connection, request.user_warren())
-            .await
-            .context("Failed to create user warren")?;
-
-        Ok(user_warren)
-    }
-
-    async fn edit_user_warren(
-        &self,
-        request: EditUserWarrenRequest,
-    ) -> Result<UserWarren, EditUserWarrenError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let user_warren = self
-            .update_user_warren(&mut connection, request.user_warren())
-            .await
-            .context("Failed to edit user warren")?;
-
-        Ok(user_warren)
-    }
-
-    async fn delete_user_warren(
-        &self,
-        request: DeleteUserWarrenRequest,
-    ) -> Result<UserWarren, DeleteUserWarrenError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let user_warren = self
-            .remove_user_from_warren(&mut connection, request.user_id(), request.warren_id())
-            .await
-            .map_err(|e| {
-                if is_not_found_error(&e) {
-                    DeleteUserWarrenError::NotFound
-                } else {
-                    anyhow!("Failed to delete user warren: {e:?}").into()
-                }
-            })?;
-
-        Ok(user_warren)
-    }
-
-    async fn fetch_user_warrens(
-        &self,
-        request: FetchUserWarrensRequest,
-    ) -> Result<Vec<UserWarren>, FetchUserWarrensError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let user_warrens = self
-            .get_user_warrens(&mut connection, request.user_id())
-            .await
-            .context("Failed to get user warrens")?;
-
-        Ok(user_warrens)
-    }
-
-    async fn list_user_warrens(
-        &self,
-        _request: ListUserWarrensRequest,
-    ) -> Result<Vec<UserWarren>, ListUserWarrensError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let user_warrens = self
-            .get_all_user_warrens(&mut connection)
-            .await
-            .context("Failed to get all user warrens")?;
-
-        Ok(user_warrens)
-    }
-
-    async fn fetch_user_warren(
-        &self,
-        request: FetchUserWarrenRequest,
-    ) -> Result<UserWarren, FetchUserWarrenError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        self.get_user_warren(&mut connection, request.user_id(), request.warren_id())
-            .await
-            .map_err(|e| {
-                if is_not_found_error(&e) {
-                    FetchUserWarrenError::NotFound
-                } else {
-                    FetchUserWarrenError::Unknown(anyhow!(e))
-                }
-            })
-    }
-
-    async fn list_users(&self, _request: ListUsersRequest) -> Result<Vec<User>, ListUsersError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let users = self
-            .fetch_users(&mut connection)
-            .await
-            .map_err(|e| anyhow!(e))?;
-
-        Ok(users)
-    }
-
-    async fn list_all_users_and_warrens<WS: WarrenService>(
-        &self,
-        _request: ListAllUsersAndWarrensRequest,
-        warren_service: &WS,
-    ) -> Result<ListAllUsersAndWarrensResponse, ListAllUsersAndWarrensError> {
-        let mut connection = self
-            .pool
-            .acquire()
-            .await
-            .context("Failed to get a PostgreSQL connection")?;
-
-        let users = self
-            .fetch_users(&mut connection)
-            .await
-            .context("Failed to fetch all users")?;
-        let user_warrens = self
-            .get_all_user_warrens(&mut connection)
-            .await
-            .context("Failed to fetch all user warrens")?;
-        let warrens = warren_service
-            .list_warrens(ListWarrensRequest::new())
-            .await
-            .context("Failed to get all warrens")?;
-
-        Ok(ListAllUsersAndWarrensResponse::new(
-            users,
-            user_warrens,
-            warrens,
-        ))
-    }
-}
-
-fn is_not_found_error(err: &sqlx::Error) -> bool {
-    matches!(err, sqlx::Error::RowNotFound)
-}
-
 fn hash_password(password: &UserPassword) -> Result<String, argon2::password_hash::Error> {
     let salt = SaltString::generate(&mut OsRng);
     let argon2 = Argon2::default();
diff --git a/backend/src/lib/outbound/postgres/mod.rs b/backend/src/lib/outbound/postgres/mod.rs
new file mode 100644
index 0000000..f1f2d59
--- /dev/null
+++ b/backend/src/lib/outbound/postgres/mod.rs
@@ -0,0 +1,67 @@
+use std::str::FromStr as _;
+
+use anyhow::Context as _;
+use sqlx::{
+    ConnectOptions as _, Connection as _, PgConnection, PgPool,
+    postgres::{PgConnectOptions, PgPoolOptions},
+};
+
+pub mod auth;
+pub mod warrens;
+
+#[derive(Debug, Clone)]
+pub struct PostgresConfig {
+    database_url: String,
+    database_name: String,
+}
+
+impl PostgresConfig {
+    pub fn new(database_url: String, database_name: String) -> Self {
+        Self {
+            database_url,
+            database_name,
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct Postgres {
+    pool: PgPool,
+}
+
+impl Postgres {
+    pub async fn new(config: PostgresConfig) -> anyhow::Result<Self> {
+        let opts = PgConnectOptions::from_str(&config.database_url)?.disable_statement_logging();
+
+        let mut connection = PgConnection::connect_with(&opts)
+            .await
+            .context("Failed to connect to the PostgreSQL database")?;
+
+        match sqlx::query("SELECT datname FROM pg_database WHERE datname = $1")
+            .bind(&config.database_name)
+            .fetch_one(&mut connection)
+            .await
+        {
+            Ok(_) => (),
+            Err(sqlx::Error::RowNotFound) => {
+                sqlx::query(&format!("CREATE DATABASE {}", config.database_name))
+                    .execute(&mut connection)
+                    .await?;
+            }
+            Err(e) => return Err(e.into()),
+        };
+
+        connection.close().await?;
+
+        let pool = PgPoolOptions::new()
+            .connect_with(opts.database(&config.database_name))
+            .await?;
+        sqlx::migrate!("./migrations").run(&pool).await?;
+
+        Ok(Self { pool })
+    }
+}
+
+pub(super) fn is_not_found_error(err: &sqlx::Error) -> bool {
+    matches!(err, sqlx::Error::RowNotFound)
+}
diff --git a/backend/src/lib/outbound/postgres/warrens.rs b/backend/src/lib/outbound/postgres/warrens.rs
new file mode 100644
index 0000000..26dfb7b
--- /dev/null
+++ b/backend/src/lib/outbound/postgres/warrens.rs
@@ -0,0 +1,138 @@
+use anyhow::{Context as _, anyhow};
+use sqlx::PgConnection;
+use uuid::Uuid;
+
+use crate::domain::warren::{
+    models::warren::{
+        FetchWarrenError, FetchWarrenRequest, FetchWarrensError, FetchWarrensRequest,
+        ListWarrensError, ListWarrensRequest, Warren,
+    },
+    ports::WarrenRepository,
+};
+
+use super::{Postgres, is_not_found_error};
+
+impl WarrenRepository for Postgres {
+    async fn fetch_warrens(
+        &self,
+        request: FetchWarrensRequest,
+    ) -> Result<Vec<Warren>, FetchWarrensError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let warrens = self
+            .fetch_warrens(&mut connection, request.ids())
+            .await
+            .map_err(|err| anyhow!(err).context("Failed to fetch warrens"))?;
+
+        Ok(warrens)
+    }
+
+    async fn list_warrens(
+        &self,
+        _request: ListWarrensRequest,
+    ) -> Result<Vec<Warren>, ListWarrensError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let warrens = self
+            .fetch_all_warrens(&mut connection)
+            .await
+            .map_err(|err| anyhow!(err).context("Failed to list all warrens"))?;
+
+        Ok(warrens)
+    }
+
+    async fn fetch_warren(&self, request: FetchWarrenRequest) -> Result<Warren, FetchWarrenError> {
+        let mut connection = self
+            .pool
+            .acquire()
+            .await
+            .context("Failed to get a PostgreSQL connection")?;
+
+        let warren = self
+            .get_warren(&mut connection, request.id())
+            .await
+            .map_err(|err| {
+                if is_not_found_error(&err) {
+                    return FetchWarrenError::NotFound(request.id().clone());
+                }
+
+                anyhow!(err)
+                    .context(format!("Failed to fetch warren with id {:?}", request.id()))
+                    .into()
+            })?;
+
+        Ok(warren)
+    }
+}
+
+impl Postgres {
+    async fn get_warren(
+        &self,
+        connection: &mut PgConnection,
+        id: &Uuid,
+    ) -> Result<Warren, sqlx::Error> {
+        let warren: Warren = sqlx::query_as(
+            "
+            SELECT
+                *
+            FROM
+                warrens
+            WHERE
+                id = $1
+            ",
+        )
+        .bind(id)
+        .fetch_one(connection)
+        .await?;
+
+        Ok(warren)
+    }
+
+    async fn fetch_warrens(
+        &self,
+        connection: &mut PgConnection,
+        ids: &[Uuid],
+    ) -> Result<Vec<Warren>, sqlx::Error> {
+        let warrens: Vec<Warren> = sqlx::query_as::<sqlx::Postgres, Warren>(
+            "
+            SELECT
+                *
+            FROM
+                warrens
+            WHERE
+                id = ANY($1)
+            ",
+        )
+        .bind(ids)
+        .fetch_all(&mut *connection)
+        .await?;
+
+        Ok(warrens)
+    }
+
+    async fn fetch_all_warrens(
+        &self,
+        connection: &mut PgConnection,
+    ) -> Result<Vec<Warren>, sqlx::Error> {
+        let warrens: Vec<Warren> = sqlx::query_as::<sqlx::Postgres, Warren>(
+            "
+            SELECT
+                *
+            FROM
+                warrens
+            ",
+        )
+        .fetch_all(&mut *connection)
+        .await?;
+
+        Ok(warrens)
+    }
+}