diff --git a/server/sql/tables.sql b/server/sql/tables.sql
index e416098..1841326 100644
--- a/server/sql/tables.sql
+++ b/server/sql/tables.sql
@@ -5,7 +5,7 @@ CREATE TABLE IF NOT EXISTS lp_ttn_end_device_uplinks (
     dev_eui VARCHAR(255),
     join_eui VARCHAR(255),
     dev_addr VARCHAR(255),
-    received_at_utc DATE,
+    received_at_utc DATE NOT NULL,
     battery NUMERIC,
     created_at_utc TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     updated_at_utc TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
@@ -16,6 +16,7 @@ CREATE TABLE IF NOT EXISTS wifi_scan (
     lp_ttn_end_device_uplinks_id UUID,
     mac VARCHAR(255),
     rssi NUMERIC,
+    scanned_at_utc DATE NOT NULL;
     created_at_utc TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     updated_at_utc TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
     FOREIGN KEY (lp_ttn_end_device_uplinks_id) REFERENCES lp_ttn_end_device_uplinks(lp_ttn_end_device_uplinks_id)
@@ -63,6 +64,7 @@ CREATE TABLE IF NOT EXISTS location (
     gnss_longitude DOUBLE,
     ttn_gw_latitude DOUBLE,
     ttn_gw_longitude DOUBLE,
+    gnss_location_at_utc DATE;
     created_at_utc TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     updated_at_utc TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
     FOREIGN KEY (lp_ttn_end_device_uplinks_id) REFERENCES lp_ttn_end_device_uplinks(lp_ttn_end_device_uplinks_id)