v0.9.8

0.9.8 Improvements and stability updates

This release continues the stabilization work and improves statistics compatibility, power-based cost calculation reliability, and interval naming clarity.

Included

• clarify the quarter-hour interval naming in sensor labels so the old quarterly reset behavior is shown as 15-Minute Energy Cost
• improve power-based cost calculation accuracy by integrating elapsed time using the previous realtime cost rate, making restart/restore handling safer, and keeping more internal precision for low-load scenarios
• add last_reset metadata to cost sensors
• change PowerCostSensor.state_class to TOTAL so interval cost sensors better match Home Assistant statistics semantics

Why this matters

• power-based (W) tracking is now more resistant to spikes and restart-related jumps, especially for sparse updates and low loads
• cost sensors provide better metadata for statistics consumers and cards that rely on reset-aware totals
• quarter-hour sensors are now named more clearly without changing their existing 15-minute behavior

Recommendation

• if you have a cumulative energy (kWh) sensor, prefer that over a power (W) sensor
• the W sensor path remains supported, but it is still an approximation that depends on reporting cadence and source sensor quality

Validation

• ruff check .
• ruff format --check .
• pytest

Notes

• manifest.json version is 0.9.8 and matches this release tag
• PowerCostSensor.state_class changed from MEASUREMENT to TOTAL; this should improve statistics semantics, but it may slightly change how Home Assistant interprets existing recorder/statistics history for those entities