diff --git a/k-tv-backend/infra/src/app_settings_repository.rs b/k-tv-backend/infra/src/app_settings_repository.rs
new file mode 100644
index 0000000..20c2827
--- /dev/null
+++ b/k-tv-backend/infra/src/app_settings_repository.rs
@@ -0,0 +1,83 @@
+//! SQLite implementation of IAppSettingsRepository.
+
+use async_trait::async_trait;
+use sqlx::SqlitePool;
+use domain::{DomainError, DomainResult, IAppSettingsRepository};
+
+pub struct SqliteAppSettingsRepository {
+    pool: SqlitePool,
+}
+
+impl SqliteAppSettingsRepository {
+    pub fn new(pool: SqlitePool) -> Self {
+        Self { pool }
+    }
+}
+
+#[async_trait]
+impl IAppSettingsRepository for SqliteAppSettingsRepository {
+    async fn get(&self, key: &str) -> DomainResult<Option<String>> {
+        sqlx::query_scalar::<_, String>("SELECT value FROM app_settings WHERE key = ?")
+            .bind(key)
+            .fetch_optional(&self.pool)
+            .await
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))
+    }
+
+    async fn set(&self, key: &str, value: &str) -> DomainResult<()> {
+        sqlx::query("INSERT OR REPLACE INTO app_settings (key, value) VALUES (?, ?)")
+            .bind(key)
+            .bind(value)
+            .execute(&self.pool)
+            .await
+            .map(|_| ())
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))
+    }
+
+    async fn get_all(&self) -> DomainResult<Vec<(String, String)>> {
+        sqlx::query_as::<_, (String, String)>("SELECT key, value FROM app_settings ORDER BY key")
+            .fetch_all(&self.pool)
+            .await
+            .map_err(|e| DomainError::InfrastructureError(e.to_string()))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use sqlx::SqlitePool;
+    use domain::IAppSettingsRepository;
+
+    async fn setup() -> SqlitePool {
+        let pool = SqlitePool::connect(":memory:").await.unwrap();
+        sqlx::query(
+            "CREATE TABLE app_settings (key TEXT PRIMARY KEY, value TEXT NOT NULL)"
+        ).execute(&pool).await.unwrap();
+        sqlx::query("INSERT INTO app_settings VALUES ('library_sync_interval_hours', '6')")
+            .execute(&pool).await.unwrap();
+        pool
+    }
+
+    #[tokio::test]
+    async fn get_returns_seeded_value() {
+        let repo = SqliteAppSettingsRepository::new(setup().await);
+        let val = repo.get("library_sync_interval_hours").await.unwrap();
+        assert_eq!(val, Some("6".to_string()));
+    }
+
+    #[tokio::test]
+    async fn set_then_get() {
+        let repo = SqliteAppSettingsRepository::new(setup().await);
+        repo.set("library_sync_interval_hours", "12").await.unwrap();
+        let val = repo.get("library_sync_interval_hours").await.unwrap();
+        assert_eq!(val, Some("12".to_string()));
+    }
+
+    #[tokio::test]
+    async fn get_all_returns_all_keys() {
+        let repo = SqliteAppSettingsRepository::new(setup().await);
+        let all = repo.get_all().await.unwrap();
+        assert!(!all.is_empty());
+        assert!(all.iter().any(|(k, _)| k == "library_sync_interval_hours"));
+    }
+}
diff --git a/k-tv-backend/infra/src/lib.rs b/k-tv-backend/infra/src/lib.rs
index b915328..bb3202f 100644
--- a/k-tv-backend/infra/src/lib.rs
+++ b/k-tv-backend/infra/src/lib.rs
@@ -18,6 +18,7 @@ pub mod db;
 pub mod factory;
 pub mod jellyfin;
 pub mod provider_registry;
+mod app_settings_repository;
 mod activity_log_repository;
 mod channel_repository;
 mod library_repository;
@@ -33,6 +34,8 @@ pub mod local_files;
 pub use db::run_migrations;
 pub use provider_registry::ProviderRegistry;
 
+#[cfg(feature = "sqlite")]
+pub use app_settings_repository::SqliteAppSettingsRepository;
 #[cfg(feature = "sqlite")]
 pub use activity_log_repository::SqliteActivityLogRepository;
 #[cfg(feature = "sqlite")]