Currently, taking a snapshot of the metadata database with sqlite creates
a sqlite file without extension with the following format:

    snapshots/2025-01-26T15:29:17Z

This makes it hard to understand what kind of data this is, and is not
consistent with LMDB:

    snapshots/2025-01-26T15:29:17Z/data.mdb

With this change, we now get a directory with a single sqlite file:

    snapshots/2025-01-26T15:29:17Z/data.sqlite

@@ -146,1 +146,4 @@
 		}
+		std::fs::create_dir_all(to)?;
+		let mut path = to.clone();
+		path.push("data.sqlite");