diff --git a/server/db/patches/004_fix_up_column_name_for_monitoring.sql b/server/db/patches/004_fix_up_column_name_for_monitoring.sql
new file mode 100644
index 0000000..ef36218
--- /dev/null
+++ b/server/db/patches/004_fix_up_column_name_for_monitoring.sql
@@ -0,0 +1,45 @@
+-- sqlite only supports a limited subset of ALTER TABLE, thus this workaround
+
+ALTER TABLE node_state RENAME TO tmp_node_state;
+
+CREATE TABLE node_state (
+    id INTEGER PRIMARY KEY,
+
+    mac VARCHAR(17) NOT NULL UNIQUE,
+
+    state VARCHAR(10) NOT NULL,
+    last_seen DATETIME NOT NULL,
+
+    import_timestamp DATETIME NOT NULL,
+
+    last_status_mail_sent DATETIME,
+    last_status_mail_type VARCHAR(20),
+
+    created_at DATETIME DEFAULT (strftime('%s','now')) NOT NULL,
+    modified_at DATETIME DEFAULT (strftime('%s','now')) NOT NULL
+);
+
+INSERT INTO node_state(
+    id,
+    mac,
+    state,
+    last_seen,
+    import_timestamp,
+    last_status_mail_sent,
+    last_status_mail_type,
+    created_at,
+    modified_at
+)
+SELECT
+    id,
+    mac,
+    state,
+    last_seen,
+    import_timestamp,
+    last_status_mail_send,
+    last_status_mail_type,
+    created_at,
+    modified_at
+FROM tmp_node_state;
+
+DROP TABLE tmp_node_state;
diff --git a/server/services/monitoringService.js b/server/services/monitoringService.js
index cfdd5e0..d2be71c 100644
--- a/server/services/monitoringService.js
+++ b/server/services/monitoringService.js
@@ -34,7 +34,7 @@ angular.module('ffffng')
 
         return Database.run(
             'INSERT INTO node_state ' +
-            '(mac, state, last_seen, import_timestamp, last_status_mail_send, last_status_mail_type) ' +
+            '(mac, state, last_seen, import_timestamp, last_status_mail_sent, last_status_mail_type) ' +
             'VALUES (?, ?, ?, ?, ?, ?)',
             [
                 node.mac,
@@ -267,7 +267,7 @@ angular.module('ffffng')
                                         var now = moment().unix();
                                         Database.run(
                                             'UPDATE node_state ' +
-                                            'SET modified_at = ?, last_status_mail_send = ?, last_status_mail_type = ?' +
+                                            'SET modified_at = ?, last_status_mail_sent = ?, last_status_mail_type = ?' +
                                             'WHERE id = ?',
                                             [
                                                 now, now, mailType,
@@ -330,19 +330,19 @@ angular.module('ffffng')
                 var allowNull = mailNumber === 1 ? ' OR last_status_mail_type IS NULL' : '';
 
                 var schedule = MONITORING_OFFLINE_MAILS_SCHEDULE[mailNumber];
-                var scheduleTimeBefore = moment().subtract(schedule.amount, schedule.unit);
+                var scheduledTimeBefore = moment().subtract(schedule.amount, schedule.unit);
 
                 Database.all(
                     'SELECT * FROM node_state ' +
                     'WHERE modified_at < ? AND state = ? AND (last_status_mail_type = ?' + allowNull + ') AND ' +
-                    'last_seen <= ? AND last_status_mail_send <= ? ' +
+                    'last_seen <= ? AND last_status_mail_sent <= ? ' +
                     'ORDER BY id ASC LIMIT ?',
                     [
                         startTime.unix(),
                         'OFFLINE',
                         previousType,
-                        scheduleTimeBefore.unix(),
-                        scheduleTimeBefore.unix(),
+                        scheduledTimeBefore.unix(),
+                        scheduledTimeBefore.unix(),
 
                         MONITORING_MAILS_DB_BATCH_SIZE
                     ],