# TODO

- Delete this file and create more GitHub issues instead?
- Missing Testcases:
    - Port at least all blackbox tests from the "old" `MemoryStore` to the new implementation
    - Check for corner cases that should fail gracefully
    - Write a more realistic `ToArchive`/`FromArchive` tests
    - Test edgecases for horizontal aggregations
- Release Data
    - Implement API endpoint for releasing old data
    - Make sure data is written to disk before it is released
    - Automatically free up old buffers periodically?
- Implement basic support for aggregations over time (stats like min/max/avg)
    - Optimization: Once a buffer is full, calculate min, max and avg
        - Calculate averages buffer-wise, average weighted by length of buffer
- Implement basic support for query of most recent value for every metric on every host
- Optimize horizontal aggregations
- Optimize locking of levels in the tree structure
    - In 99.9% of cases, no new level will need to be created, so all lookups into `level.children` will be read only
    - `level.metrics` will be modified more often and will accesses will need to be serialized here
    - Suggestion: Use a proper Mutex for `level.metrics`, but something read-optimized and possibly lock-free for `level.children`
- ...