router: require jq for route-health.sh, add fatal() to functions

router/functions

@@ -2,6 +2,7 @@
 # --- Shared helpers (used by route-update.sh, route-health.sh) ---
 
 log() { echo "$(date '+%H:%M:%S') $*" ; }
+fatal() { log "FATAL: $*" >&2 ; exit 1 ; }
 
 # Read first non-comment non-empty line from a config file
 read_value() { grep -v '^#' "$1" 2>/dev/null | grep -m1 . ; }

router/route-health.sh

@@ -35,12 +35,8 @@ if [ -z "$response" ] ; then
 fi
 
 # Parse JSON → "gateway packet_loss" lines
-if command -v jq >/dev/null 2>&1 ; then
-    echo "$response" | jq -r '.results[0].series[]? | "\(.tags.gateway) \(.values[0][1])"' > "$HEALTH_DATA"
-else
-    echo "$response" | sed 's/},/}\n/g' | \
-        sed -n 's/.*"gateway":"\([^"]*\)".*\[\["[^"]*",\([0-9.]*\)\].*/\1 \2/p' > "$HEALTH_DATA"
-fi
+epm -y assure jq || fatal "jq is required"
+echo "$response" | jq -r '.results[0].series[]? | "\(.tags.gateway) \(.values[0][1])"' > "$HEALTH_DATA"
 
 if [ ! -s "$HEALTH_DATA" ] ; then
     log "ERROR: No health data from InfluxDB"