Add selectStopProductClassCount

sandook/src/commonMain/kotlin/xyz/ksharma/krail/sandook/RealSandook.kt

@@ -102,6 +102,10 @@ internal class RealSandook(factory: SandookDriverFactory) : Sandook {
         return nswStopsQueries.selectStopsCount().executeAsOne().toInt()
     }
 
+    override fun productClassCount(): Int {
+        return nswStopsQueries.selectStopProductClassCount().executeAsOne().toInt()
+    }
+
     override fun insertNswStopProductClass(stopId: String, productClass: Int) {
         nswStopsQueries.insertStopProductClass(stopId, productClass.toLong())
     }

sandook/src/commonMain/kotlin/xyz/ksharma/krail/sandook/Sandook.kt

@@ -38,6 +38,8 @@ interface Sandook {
 
     fun stopsCount(): Int
 
+    fun productClassCount(): Int
+
     fun insertNswStopProductClass(stopId: String, productClass: Int)
 
     /**

sandook/src/commonMain/sqldelight/xyz/ksharma/krail/sandook/NswStops.sq

@@ -31,6 +31,11 @@ insertStopProductClass:
 INSERT INTO NswStopProductClass(stopId, productClass)
 VALUES (?, ?);
 
+-- Select count of items in NswStopProductClass
+selectStopProductClassCount:
+SELECT COUNT(*) AS totalItems
+FROM NswStopProductClass;
+
 clearNswStopsTable:
 DELETE FROM NswStops;