Maidenhead grid module converts grid squares to lat/lon coordinates. Submission form validates grids, bands, modes, and email, computes positions and distance, then triggers the weather/HRRR/terrain processing pipeline via Oban.
- Radio context with QSO schema and CSV import script (58K contacts) - Solar index schema, GFZ client, and daily Oban cron worker - LiveView dashboard with QSO table and weather correlation views - Parallelize weather import script using Task.async_stream (10 concurrent workers) - Replace sequential rate_limit sleeps with concurrency-based backpressure - Atomic progress counter for interleave-safe reporting
