fix: use earlier realtime tick for arrival ETA

station_broadcast.lua

@@ -2,7 +2,7 @@
 -- ============================================================================
 -- 1. Configuration & Constants
 -- ============================================================================
-local APP_VERSION_TEXT = "v1.0.33"
+local APP_VERSION_TEXT = "v1.0.34"
 
 local CONFIG = {
     CLOUD_URL = "ws://stabadmin.fse-media.group",
@@ -2427,6 +2427,15 @@ local function normalizeUpcomingKey(trainName, destination)
     return clean(trainName) .. "_" .. clean(destination)
 end
 
+local function pickEarlierTick(a, b)
+    local ta = tonumber(a)
+    local tb = tonumber(b)
+    if ta and tb then
+        return math.min(ta, tb)
+    end
+    return ta or tb or 0
+end
+
 function Main.loop()
     while true do
         local now = os.epoch("utc")
@@ -2560,8 +2569,8 @@ function Main.loop()
                         end
                         
                         -- Calculate ETA in seconds using interpolated currentTick
-                        local scheduledArrival = st.ScheduledArrival or 0
-                        local realArrival = st.RealTimeArrival or 0
+                        local scheduledArrival = pickEarlierTick(st.ScheduledArrival, st.ScheduledDeparture)
+                        local realArrival = pickEarlierTick(st.RealTimeArrival, st.RealTimeDeparture)
                         local etaTicks = realArrival - currentTick
                         local etaSeconds = math.floor(etaTicks / (State.tickRate or 20))
                         if etaSeconds < 0 then etaSeconds = 0 end