test(versions): ingest linking, listings, endpoints, tag binding, lifecycle

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/database/mod.rs

@@ -307,6 +307,14 @@ impl SqliteFavoriteDao {
     }
 }
 
+#[cfg(test)]
+impl SqliteFavoriteDao {
+    /// Test-only constructor sharing an already-wrapped connection.
+    pub fn from_shared(connection: Arc<Mutex<SqliteConnection>>) -> Self {
+        SqliteFavoriteDao { connection }
+    }
+}
+
 impl FavoriteDao for SqliteFavoriteDao {
     fn add_favorite(&mut self, user_id: i32, favorite_path: &str) -> Result<usize, DbError> {
         use schema::favorites::dsl::*;