rebuild file structur + simple sqlite db endpoint

src/utils/db_pool.rs

@@ -0,0 +1,35 @@
+use std::sync::Arc;
+use dashmap::DashMap;
+use r2d2::{Pool};
+use r2d2_sqlite::SqliteConnectionManager;
+
+type HotelId = i32; // or i32 if you want numeric ids
+
+#[derive(Clone)]
+pub struct HotelPools {
+    pools: Arc<DashMap<HotelId, Pool<SqliteConnectionManager>>>,
+}
+
+impl HotelPools {
+    pub fn new() -> Self {
+        Self {
+            pools: Arc::new(DashMap::new()),
+        }
+    }
+
+    pub fn get_pool(&self, hotel_id: i32) -> Pool<SqliteConnectionManager> {
+        if let Some(pool) = self.pools.get(&hotel_id) {
+            return pool.clone();
+        }
+
+        let db_path = format!("db/{}.sqlite", hotel_id);
+        let manager = SqliteConnectionManager::file(db_path);
+        let pool = Pool::builder()
+            .max_size(5) // adjust based on load
+            .build(manager)
+            .expect("Failed to build pool");
+
+        self.pools.insert(hotel_id, pool.clone());
+        pool
+    }
+}