Expose protected tree structure

src/db/repositories/circuit-protection-device.repository.ts

@@ -0,0 +1,17 @@
+import { inArray } from "drizzle-orm";
+import type { AppDatabase } from "../database-context.js";
+import { circuitProtectionDevices } from "../schema/circuit-protection-devices.js";
+
+export class CircuitProtectionDeviceRepository {
+  constructor(private readonly database: AppDatabase) {}
+
+  async listByCircuitIds(circuitIds: string[]) {
+    if (circuitIds.length === 0) {
+      return [];
+    }
+    return this.database
+      .select()
+      .from(circuitProtectionDevices)
+      .where(inArray(circuitProtectionDevices.circuitId, circuitIds));
+  }
+}