add foreign keys and extend models

device-app/database/migrations/2023_03_20_114828_create_location_transactions_table.php

@@ -16,6 +16,7 @@ return new class extends Migration
             $table->string('room_code');
             $table->string('timestamp_located_since');
             $table->string('device_id');
+            $table->foreign('device_id')->references('device_id')->on('devices');
         });
     }
 

device-app/database/migrations/2023_03_20_114834_create_owner_transactions_table.php

@@ -16,6 +16,7 @@ return new class extends Migration
             $table->string('rz_username');
             $table->string('timestamp_owner_since');
             $table->string('device_id');
+            $table->foreign('device_id')->references('device_id')->on('devices');
         });
     }
 

device-app/database/migrations/2023_03_20_114945_create_purchasing_information_table.php

@@ -18,7 +18,8 @@ return new class extends Migration
             $table->string('timestamp_purchase');
             $table->string('cost_centre');
             $table->string('seller')->nullable();
-            $table->string('device_id')->unique();
+            $table->string('device_id');
+            $table->foreign('device_id')->references('device_id')->on('devices');
         });
     }