fix(db): add ON CONFLICT DO NOTHING rules for sensor table duplicate inserts

src/database/migrations/2026_05_28_000001_add_duplicate_ignore_rules.php

@@ -0,0 +1,54 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        DB::statement("
+            CREATE OR REPLACE RULE rainfall_ignore_dups AS
+                ON INSERT TO rainfall
+                WHERE EXISTS (SELECT 1 FROM rainfall WHERE id = NEW.id)
+                DO INSTEAD NOTHING
+        ");
+
+        DB::statement("
+            CREATE OR REPLACE RULE waterlevel_ignore_dups AS
+                ON INSERT TO waterlevel
+                WHERE EXISTS (SELECT 1 FROM waterlevel WHERE id = NEW.id)
+                DO INSTEAD NOTHING
+        ");
+
+        DB::statement("
+            CREATE OR REPLACE RULE notification_ignore_dups AS
+                ON INSERT TO notification
+                WHERE EXISTS (SELECT 1 FROM notification WHERE id = NEW.id)
+                DO INSTEAD NOTHING
+        ");
+
+        DB::statement("
+            CREATE OR REPLACE RULE siren_ignore_dups AS
+                ON INSERT TO siren
+                WHERE EXISTS (SELECT 1 FROM siren WHERE id = NEW.id)
+                DO INSTEAD NOTHING
+        ");
+
+        DB::statement("
+            CREATE OR REPLACE RULE station_ignore_dups AS
+                ON INSERT TO station
+                WHERE EXISTS (SELECT 1 FROM station WHERE stationid = NEW.stationid)
+                DO INSTEAD NOTHING
+        ");
+    }
+
+    public function down(): void
+    {
+        DB::statement("DROP RULE IF EXISTS rainfall_ignore_dups ON rainfall");
+        DB::statement("DROP RULE IF EXISTS waterlevel_ignore_dups ON waterlevel");
+        DB::statement("DROP RULE IF EXISTS notification_ignore_dups ON notification");
+        DB::statement("DROP RULE IF EXISTS siren_ignore_dups ON siren");
+        DB::statement("DROP RULE IF EXISTS station_ignore_dups ON station");
+    }
+};