Write SqlDbLayer

src/data_provider/sqlite.rs

@@ -65,4 +65,10 @@ pub fn default_connection() -> Connection {
         .execute("PRAGMA foreign_keys = ON;", [])
         .expect("Failed to set PRAGMA");
     connection
+        .execute("PRAGMA journal_mode = WAL;", [])
+        .expect("Failed to set PRAGMA");
+    connection
+        .execute("PRAGMA synchronous = NORMAL;", [])
+        .expect("Failed to set PRAGMA");
+    connection
 }