diff --git a/src/main/kotlin/com/restapi/domain/models.kt b/src/main/kotlin/com/restapi/domain/models.kt
index 7df1dc5..8c60201 100644
--- a/src/main/kotlin/com/restapi/domain/models.kt
+++ b/src/main/kotlin/com/restapi/domain/models.kt
@@ -289,6 +289,10 @@ open class Plant : BaseModel() {
             this.clear()
             this.putAll(p.print ?: emptyMap())
         }
+        this.limits?.apply {
+            this.clear()
+            this.putAll(p.limits ?: emptyMap())
+        }
         this.save()
     }
 
diff --git a/src/main/resources/scripts/expense.kts b/src/main/resources/scripts/expense.kts
new file mode 100644
index 0000000..c37b836
--- /dev/null
+++ b/src/main/resources/scripts/expense.kts
@@ -0,0 +1,35 @@
+import com.restapi.domain.DataModel
+import com.restapi.domain.EntityModel
+import io.ebean.Database
+import org.slf4j.Logger
+import java.time.LocalDate
+
+fun execute(d: Map<String, Any>, entityModel: EntityModel?, db: Database, logger: Logger, user: String, tenant: String): Map<String, Any> {
+    println("execute on $d")
+    //check if the limits have exceeded in the given month
+
+    //language=PostgreSQL
+    val q = db.sqlQuery(
+        """
+        select sum(cast(data->>'amount' as float)) as amount from data_model
+        where entity_name = 'expense' 
+        and cast(data->>'date' as timestamp) between :f and :t
+        and data->>'plantId' = :p
+    """.trimIndent()
+    )
+    q.setParameter("f", LocalDate.parse(d["fromDate"] as String))
+    q.setParameter("t", LocalDate.parse(d["toDate"] as String))
+    q.setParameter("p", d["plantId"] as String)
+    val sum = q.findOne()?.getLong("amount") ?: 0
+
+    return mapOf("sum" to sum)
+}
+
+fun preSave(d: DataModel, entityModel: EntityModel?, db: Database, logger: Logger, user: String, tenant: String): Boolean {
+    logger.warn("PreSave $d")
+    return true
+}
+
+fun postSave(d: DataModel, entityModel: EntityModel?, db: Database, logger: Logger, user: String, tenant: String) {
+    println("PostSave $d")
+}
\ No newline at end of file