feat: seed demo character and first locations

apps/api/src/database/seeds/run-seed.ts

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+import { AppDataSource } from '../data-source';
+import { seedVisibleVerticalSlice } from './vertical-slice.seed';
+
+async function runSeed(): Promise<void> {
+  await AppDataSource.initialize();
+
+  try {
+    await seedVisibleVerticalSlice(AppDataSource);
+  } finally {
+    await AppDataSource.destroy();
+  }
+}
+
+void runSeed().catch((error: unknown) => {
+  console.error('Demo seed failed:', error);
+  process.exitCode = 1;
+});

apps/api/src/database/seeds/vertical-slice.constants.ts

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+export const SOUTH_GATE_ID = '20000000-0000-4000-8000-000000000001';
+export const BURNED_ROAD_ID = '20000000-0000-4000-8000-000000000002';

apps/api/src/database/seeds/vertical-slice.seed.spec.ts

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+import { DataSource } from 'typeorm';
+import { seedVisibleVerticalSlice } from './vertical-slice.seed';
+
+type Row = Record<string, unknown>;
+
+const DEMO_CHARACTER_ID = '10000000-0000-4000-8000-000000000001';
+const SOUTH_GATE_ID = '20000000-0000-4000-8000-000000000001';
+const BURNED_ROAD_ID = '20000000-0000-4000-8000-000000000002';
+
+class InMemoryRepository {
+  readonly rows: Row[] = [];
+  readonly upsert = jest.fn(
+    async (
+      values: Row | Row[],
+      conflictPaths: string[] | { conflictPaths: string[] },
+    ) => {
+      const conflictKeys = Array.isArray(conflictPaths)
+        ? conflictPaths
+        : conflictPaths.conflictPaths;
+
+      for (const value of Array.isArray(values) ? values : [values]) {
+        const existing = this.rows.find((row) =>
+          conflictKeys.every((key) => row[key] === value[key]),
+        );
+
+        if (existing) {
+          Object.assign(existing, value);
+        } else {
+          this.rows.push({ ...value });
+        }
+      }
+    },
+  );
+  readonly findOneBy = jest.fn(async (criteria: Row) =>
+    this.rows.find((row) =>
+      Object.entries(criteria).every(([key, value]) => row[key] === value),
+    ),
+  );
+  readonly insert = jest.fn(async (value: Row) => {
+    this.rows.push({ ...value });
+  });
+}
+
+describe('seedVisibleVerticalSlice', () => {
+  it('upserts the two locations and directed connections while inserting one stable demo character', async () => {
+    const locationRepository = new InMemoryRepository();
+    const connectionRepository = new InMemoryRepository();
+    const characterRepository = new InMemoryRepository();
+    const dataSource = {
+      getRepository: jest
+        .fn()
+        .mockReturnValueOnce(locationRepository)
+        .mockReturnValueOnce(connectionRepository)
+        .mockReturnValueOnce(characterRepository)
+        .mockReturnValueOnce(locationRepository)
+        .mockReturnValueOnce(connectionRepository)
+        .mockReturnValueOnce(characterRepository),
+    } as unknown as DataSource;
+
+    await seedVisibleVerticalSlice(dataSource);
+    await seedVisibleVerticalSlice(dataSource);
+
+    expect(locationRepository.upsert).toHaveBeenCalledWith(
+      expect.arrayContaining([
+        expect.objectContaining({ id: SOUTH_GATE_ID, key: 'south-gate' }),
+        expect.objectContaining({ id: BURNED_ROAD_ID, key: 'burned-road' }),
+      ]),
+      ['key'],
+    );
+    expect(connectionRepository.upsert).toHaveBeenCalledWith(
+      expect.arrayContaining([
+        expect.objectContaining({
+          fromLocationId: SOUTH_GATE_ID,
+          toLocationId: BURNED_ROAD_ID,
+        }),
+        expect.objectContaining({
+          fromLocationId: BURNED_ROAD_ID,
+          toLocationId: SOUTH_GATE_ID,
+        }),
+      ]),
+      ['fromLocationId', 'toLocationId'],
+    );
+    expect(characterRepository.insert).toHaveBeenCalledWith(
+      expect.objectContaining({ id: DEMO_CHARACTER_ID }),
+    );
+    expect(locationRepository.rows).toHaveLength(2);
+    expect(connectionRepository.rows).toHaveLength(2);
+    expect(characterRepository.rows).toHaveLength(1);
+  });
+});

apps/api/src/database/seeds/vertical-slice.seed.ts

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+import { DataSource } from 'typeorm';
+import { DEMO_CHARACTER_ID } from '../../demo/demo-character.constants';
+import { Character } from '../../characters/entities/character.entity';
+import { LocationConnection } from '../../world/entities/location-connection.entity';
+import { LocationDefinition } from '../../world/entities/location-definition.entity';
+import { BURNED_ROAD_ID, SOUTH_GATE_ID } from './vertical-slice.constants';
+
+export async function seedVisibleVerticalSlice(
+  dataSource: DataSource,
+): Promise<void> {
+  const locationRepository = dataSource.getRepository(LocationDefinition);
+  const connectionRepository = dataSource.getRepository(LocationConnection);
+  const characterRepository = dataSource.getRepository(Character);
+
+  await locationRepository.upsert(
+    [
+      {
+        id: SOUTH_GATE_ID,
+        key: 'south-gate',
+        name: 'Südtor von Graufurt',
+        description:
+          'Am schwarzen Südtor endet der Schutz Graufurts. Hinter den Wachtfeuern beginnt die stille Weite der Aschenfelder.',
+        regionKey: 'ashen-fields',
+        minRecommendedLevel: 1,
+        maxRecommendedLevel: 1,
+        dangerLevel: 0,
+        isSafe: true,
+        huntingEnabled: false,
+        artworkPath: '/assets/locations/south-gate.webp',
+      },
+      {
+        id: BURNED_ROAD_ID,
+        key: 'burned-road',
+        name: 'Verbrannte Straße',
+        description:
+          'Die alte Handelsstraße führt durch verkohlte Felder. Zwischen Asche und zerbrochenen Wagen warten die ersten Gefahren.',
+        regionKey: 'ashen-fields',
+        minRecommendedLevel: 1,
+        maxRecommendedLevel: 2,
+        dangerLevel: 1,
+        isSafe: false,
+        huntingEnabled: true,
+        artworkPath: '/assets/locations/burned-road.webp',
+      },
+    ],
+    ['key'],
+  );
+
+  await connectionRepository.upsert(
+    [
+      {
+        fromLocationId: SOUTH_GATE_ID,
+        toLocationId: BURNED_ROAD_ID,
+        travelDurationSeconds: 10,
+        ambushChance: '0.0500',
+        enabled: true,
+      },
+      {
+        fromLocationId: BURNED_ROAD_ID,
+        toLocationId: SOUTH_GATE_ID,
+        travelDurationSeconds: 10,
+        ambushChance: '0.0500',
+        enabled: true,
+      },
+    ],
+    ['fromLocationId', 'toLocationId'],
+  );
+
+  const existing = await characterRepository.findOneBy({
+    id: DEMO_CHARACTER_ID,
+  });
+
+  if (!existing) {
+    await characterRepository.insert({
+      id: DEMO_CHARACTER_ID,
+      name: 'Aric Duskwalker',
+      level: 1,
+      experience: 0,
+      baseHp: 100,
+      baseAttack: 6,
+      currentHp: 100,
+      currentLocationId: SOUTH_GATE_ID,
+    });
+  }
+}

apps/api/src/demo/demo-character.constants.ts

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+export const DEMO_CHARACTER_ID = '10000000-0000-4000-8000-000000000001';