Kostenstellenhierarchie und Auswertung mit Unterkostenstellen ergänzt

backend/db/migrations/0033_costcentres_parent.sql

@@ -0,0 +1,2 @@
+ALTER TABLE "costcentres" ADD COLUMN "parent_costcentre" uuid;
+ALTER TABLE "costcentres" ADD CONSTRAINT "costcentres_parent_costcentre_costcentres_id_fk" FOREIGN KEY ("parent_costcentre") REFERENCES "public"."costcentres"("id") ON DELETE no action ON UPDATE no action;

backend/db/migrations/meta/_journal.json

@@ -232,6 +232,13 @@
       "when": 1776298800000,
       "tag": "0032_manual_statementallocations_invoice_side",
       "breakpoints": true
+    },
+    {
+      "idx": 33,
+      "version": "7",
+      "when": 1777003200000,
+      "tag": "0033_costcentres_parent",
+      "breakpoints": true
     }
   ]
 }

backend/db/schema/costcentres.ts

@@ -29,6 +29,8 @@ export const costcentres = pgTable("costcentres", {
     number: text("number").notNull(),
     name: text("name").notNull(),
 
+    parentCostcentre: uuid("parent_costcentre").references(() => costcentres.id),
+
     vehicle: bigint("vehicle", { mode: "number" }).references(() => vehicles.id),
 
     project: bigint("project", { mode: "number" }).references(() => projects.id),