v2026.7.7-beta.1 (pre-release)

Pre-release for testing multi-entity (net energy) support. Not a final release.

Added

• Multi-entity support (hourly mode): optional secondary_entity + operation (difference or sum) renders the per-hour combination of two entities. Enables net-energy heatmaps such as grid import minus export without a template sensor. Entities are aligned by calendar day and hour; energy (total/total_increasing) gaps count as 0, measurement gaps yield no value.
• net energy diverging scale (blue-white-red) for signed results. With auto range, a difference centers zero on white by widening the range symmetrically. The visual editor suggests this scale automatically when a secondary entity is combined with difference.

Testing

Deploy heatmap-card.js to /config/www/, hard-refresh, and confirm the console shows HEATMAP-CARD 2026.7.7-beta.1. Configure entity + secondary_entity + operation: difference + scale: net energy on your import/export sensors.