Add component persistence foundation

src/db/schema/circuit-list-equipment-identifiers.ts

@@ -0,0 +1,26 @@
+import { sqliteTable, text, unique } from "drizzle-orm/sqlite-core";
+import { circuitLists } from "./circuit-lists.js";
+
+export const circuitListEquipmentIdentifiers = sqliteTable(
+  "circuit_list_equipment_identifiers",
+  {
+    ownerType: text("owner_type")
+      .$type<"circuit" | "distribution_board_component">()
+      .notNull(),
+    ownerId: text("owner_id").notNull(),
+    circuitListId: text("circuit_list_id")
+      .notNull()
+      .references(() => circuitLists.id, { onDelete: "cascade" }),
+    equipmentIdentifier: text("equipment_identifier").notNull(),
+  },
+  (table) => [
+    unique("circuit_list_equipment_identifiers_owner_unique").on(
+      table.ownerType,
+      table.ownerId
+    ),
+    unique("circuit_list_equipment_identifiers_list_identifier_unique").on(
+      table.circuitListId,
+      table.equipmentIdentifier
+    ),
+  ]
+);