Simplify status interface

config.example.toml

@@ -3,7 +3,7 @@ source_id = "home-gen24"
 archive = "data/archive"            # Parquet directory, relative to this configuration file.
 timezone = "Europe/Zurich"          # Used for date-only export/replay arguments.
 poll_interval_seconds = 300
-retention_days = 30                 # Days AFTER acknowledgement; pending records never expire.
+retention_days = 30                 # Full local days after acknowledgement; pending days never expire.
 
 [inverter]
 base_url = "http://fronius.local"
@@ -32,6 +32,7 @@ enabled = false
 pv_system_id = "" # Your Solar.web PV system UUID; required when enabled.
 username = "" # Account email; enter real credentials only in private config.toml.
 password = ""
+# Recover from local midnight collector.retention_days ago, including empty days.
 lag_seconds = 7200 # Allow the inverter to upload its hourly historical data.
 check_interval_seconds = 3600
 request_timeout_seconds = 45