Add initial (#1)

src/db.rs

@@ -0,0 +1,23 @@
+pub fn hash_exists(hash: &str) -> bool {
+    let tree = sled::open("./deals_db").expect("open");
+    let result = tree.get(hash);
+    if result.is_err() {
+        error!("{:?}", &result);
+    }
+    if result == Ok(None) {
+        return false;
+    }
+    true
+}
+
+pub fn insert(hash: &str) {
+    let tree = sled::open("./deals_db").expect("open");
+    let result = tree.insert(&hash, "");
+    if result.is_err() {
+        error!("{:?}", &result);
+    }
+    let result = tree.flush();
+    if result.is_err() {
+        error!("{:?}", &result);
+    }
+}