diff --git a/src/db/app.rs b/src/db/app.rs
index 08c1dde..6b2766a 100644
--- a/src/db/app.rs
+++ b/src/db/app.rs
@@ -30,7 +30,8 @@ pub struct AppNode {
     pub avail_ports: u32,
     pub max_ports_per_app: u32,
     pub price: u64,
-    pub offline_minutes: u64,
+    pub connected_at: Datetime,
+    pub disconnected_at: Datetime,
 }
 
 impl AppNode {
@@ -40,6 +41,18 @@ impl AppNode {
         let app_node: Option<AppNode> = db.upsert(app_node_id.clone()).content(self).await?;
         app_node.ok_or(Error::FailedToCreateDBEntry(format!("{APP_NODE}:{app_node_id}")))
     }
+
+    pub async fn set_online(db: &Surreal<Client>, app_node_id: &str) -> Result<(), Error> {
+        db.query(format!("UPDATE {APP_NODE}:{app_node_id} SET connected_at = time::now();"))
+            .await?;
+        Ok(())
+    }
+
+    pub async fn set_offline(db: &Surreal<Client>, app_node_id: &str) -> Result<(), Error> {
+        db.query(format!("UPDATE {APP_NODE}:{app_node_id} SET disconnected_at = time::now();"))
+            .await?;
+        Ok(())
+    }
 }
 
 pub enum AppDaemonMsg {
@@ -217,7 +230,6 @@ pub struct AppNodeWithReports {
     pub avail_ports: u32,
     pub max_ports_per_app: u32,
     pub price: u64,
-    pub offline_minutes: u64,
     pub reports: Vec<Report>,
 }
 
@@ -255,6 +267,8 @@ impl AppNodeWithReports {
             filter_query += &format!("&& ip = '{}' ", filters.ip);
         }
 
+        filter_query += " && connected_at > disconnected_at ";
+
         if limit_one {
             filter_query += "limit 1";
         }
@@ -624,7 +638,8 @@ impl From<&old_brain::BrainData> for Vec<AppNode> {
                 avail_ports: old_node.avail_no_of_port,
                 max_ports_per_app: old_node.max_ports_per_app,
                 price: old_node.price,
-                offline_minutes: old_node.offline_minutes,
+                disconnected_at: Datetime::default(),
+                connected_at: Datetime::default(),
             });
         }
         nodes
diff --git a/src/grpc/app.rs b/src/grpc/app.rs
index b268cc4..fe44eeb 100644
--- a/src/grpc/app.rs
+++ b/src/grpc/app.rs
@@ -56,7 +56,8 @@ impl BrainAppDaemon for AppDaemonServer {
             avail_storage_mib: 0,
             avail_ports: 0,
             max_ports_per_app: 0,
-            offline_minutes: 0,
+            disconnected_at: surrealdb::sql::Datetime::default(),
+            connected_at: surrealdb::sql::Datetime::default(),
         };
 
         app_node.register(&self.db).await?;
@@ -88,6 +89,7 @@ impl BrainAppDaemon for AppDaemonServer {
         )?;
 
         info!("App Daemon {} connected to receive brain messages", pubkey);
+        let _ = db::AppNode::set_online(&self.db, &pubkey).await;
 
         let (tx, rx) = mpsc::channel(6);
         {
@@ -161,7 +163,8 @@ impl BrainAppDaemon for AppDaemonServer {
                 },
 
                 Err(e) => {
-                    log::warn!("App Daemon Disconnected: {e:?}")
+                    log::warn!("App Daemon Disconnected: {e:?}");
+                    let _ = db::AppNode::set_offline(&self.db, &pubkey).await;
                 }
             }
         }
diff --git a/surql/tables.sql b/surql/tables.sql
index 5ab6655..b1459c0 100644
--- a/surql/tables.sql
+++ b/surql/tables.sql
@@ -94,7 +94,8 @@ DEFINE FIELD avail_storage_mib ON TABLE app_node TYPE int;
 DEFINE FIELD avail_ports ON TABLE app_node TYPE int;
 DEFINE FIELD max_ports_per_app ON TABLE app_node TYPE int;
 DEFINE FIELD price ON TABLE app_node TYPE int;
-DEFINE FIELD offline_minutes ON TABLE app_node TYPE int;
+DEFINE FIELD connected_at ON TABLE app_node TYPE datetime;
+DEFINE FIELD disconnected_at ON TABLE app_node TYPE datetime;
 
 DEFINE TABLE new_app_req Type RELATION FROM account to app_node SCHEMAFULL;
 DEFINE FIELD app_name ON TABLE new_app_req TYPE string;
diff --git a/surql/timer.sql b/surql/timer.sql
index 7b40a59..2f0a4ad 100644
--- a/surql/timer.sql
+++ b/surql/timer.sql
@@ -31,4 +31,32 @@ FOR $contract IN (select * from active_vm fetch out) {
     };
 };
 
--- TODO: implement for active_app
+FOR $app_contract IN (select * from active_app fetch out) {
+    LET $operator = (select * from $app_contract.out.operator)[0];
+    LET $node_is_online = $app_contract.out.connected_at > $app_contract.out.disconnected_at;
+    LET $price_per_minute = fn::app_price_per_minute($app_contract.id);
+    LET $amount_due = (time::now() - $app_contract.collected_at).mins() * $price_per_minute;
+    LET $amount_paid = IF $amount_due > $app_contract.locked_nano {
+        $app_contract.locked_nano
+    } ELSE {
+        $amount_due
+    };
+    LET $escrow_multiplier = IF $operator.escrow < 5_000_000_000_000 { 1 } ELSE { 5 };
+    IF $node_is_online {
+        UPDATE $operator.id SET balance += $amount_paid * $escrow_multiplier;
+        UPDATE $app_contract.id SET
+            locked_nano -= $amount_paid,
+            collected_at = time::now();
+    } ELSE {
+        LET $compensation = IF $amount_due > $operator.escrow {
+            $operator.escrow
+        } ELSE {
+            $amount_due
+        };
+        UPDATE $operator.id SET escrow -= $compensation;
+        UPDATE $app_contract.in SET balance += $compensation;
+    };
+    IF $amount_paid >= $app_contract.locked_nano {
+        fn::delete_app($app_contract.id);
+    }
+}