diff --git a/wellness/self-care/backend/__tests__/self-care.service.spec.ts b/wellness/self-care/backend/__tests__/self-care.service.spec.ts
new file mode 100644
index 0000000..e605366
--- /dev/null
+++ b/wellness/self-care/backend/__tests__/self-care.service.spec.ts
@@ -0,0 +1,621 @@
+import { NotFoundException } from '@nestjs/common';
+import { Test, TestingModule } from '@nestjs/testing';
+import { getRepositoryToken } from '@nestjs/typeorm';
+import { EventEmitter2 } from '@nestjs/event-emitter';
+import { SelfCareService } from '../self-care.service';
+import { SelfCareBaselineService } from '../self-care-baseline.service';
+import { SelfCareCategory } from '../entities/self-care-category.entity';
+import { SelfCareLog } from '../entities/self-care-log.entity';
+import { SelfCareBaseline, BaselineSnapshotEntry } from '../entities/self-care-baseline.entity';
+import { mockRepository, MockRepository } from '@test-helpers/mock-repository';
+import { SelfCareCondition } from '@life-platform/shared';
+
+jest.mock('@common/resolve-short-id', () => ({
+  resolveShortId: jest.fn(async (_repo: unknown, id: string) => id),
+}));
+
+const UUID_1 = 'a1b2c3d4-1111-2222-3333-444455556666';
+const UUID_2 = 'b2c3d4e5-2222-3333-4444-555566667777';
+const UUID_3 = 'c3d4e5f6-3333-4444-5555-666677778888';
+const UUID_CAT1 = 'd4e5f6a7-4444-5555-6666-777788889999';
+const UUID_CAT2 = 'e5f6a7b8-5555-6666-7777-888899990000';
+const UUID_LOG1 = 'f6a7b8c9-6666-7777-8888-999900001111';
+
+function makeCategory(overrides: Partial<SelfCareCategory> = {}): SelfCareCategory {
+  return {
+    id: UUID_CAT1,
+    name: 'Haircut',
+    slug: 'haircut',
+    description: null,
+    cadenceDays: 30,
+    cadenceWarningDays: 24,
+    isActive: true,
+    sortOrder: 0,
+    icon: null,
+    tags: [],
+    createdAt: new Date(),
+    updatedAt: new Date(),
+    ...overrides,
+  } as SelfCareCategory;
+}
+
+function makeLog(overrides: Partial<SelfCareLog> = {}): SelfCareLog {
+  return {
+    id: UUID_LOG1,
+    categoryId: UUID_CAT1,
+    loggedAt: new Date(),
+    condition: SelfCareCondition.Good,
+    notes: null,
+    photoUrl: null,
+    isBackdated: false,
+    metadata: null,
+    createdAt: new Date(),
+    updatedAt: new Date(),
+    ...overrides,
+  } as SelfCareLog;
+}
+
+function makeBaseline(overrides: Partial<SelfCareBaseline> = {}): SelfCareBaseline {
+  return {
+    id: UUID_1,
+    name: 'Baseline #1',
+    takenAt: new Date(),
+    notes: null,
+    snapshot: [],
+    tags: [],
+    createdAt: new Date(),
+    updatedAt: new Date(),
+    ...overrides,
+  } as SelfCareBaseline;
+}
+
+describe('SelfCareService', () => {
+  let service: SelfCareService;
+  let categoryRepo: MockRepository;
+  let logRepo: MockRepository;
+  let eventEmitter: { emit: jest.Mock };
+
+  beforeEach(async () => {
+    categoryRepo = mockRepository();
+    logRepo = mockRepository();
+    eventEmitter = { emit: jest.fn() };
+
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        SelfCareService,
+        { provide: getRepositoryToken(SelfCareCategory), useValue: categoryRepo },
+        { provide: getRepositoryToken(SelfCareLog), useValue: logRepo },
+        { provide: EventEmitter2, useValue: eventEmitter },
+      ],
+    }).compile();
+
+    service = module.get(SelfCareService);
+  });
+
+  describe('createCategory', () => {
+    it('should create a category with auto-generated slug and warning days', async () => {
+      const dto = { name: 'Hair Color', cadenceDays: 60 };
+      const created = makeCategory({ name: 'Hair Color', slug: 'hair-color', cadenceDays: 60, cadenceWarningDays: 48 });
+      categoryRepo.create.mockReturnValue(created);
+      categoryRepo.save.mockResolvedValue(created);
+
+      const result = await service.createCategory(dto as never);
+
+      expect(categoryRepo.create).toHaveBeenCalledWith(expect.objectContaining({
+        name: 'Hair Color',
+        slug: 'hair-color',
+        cadenceDays: 60,
+        cadenceWarningDays: 48,
+        isActive: true,
+      }));
+      expect(result).toEqual(created);
+    });
+
+    it('should use provided slug when given', async () => {
+      const dto = { name: 'Nails', slug: 'custom-slug', cadenceDays: 14 };
+      categoryRepo.create.mockImplementation((d) => d);
+      categoryRepo.save.mockImplementation((e) => Promise.resolve(e));
+
+      await service.createCategory(dto as never);
+
+      expect(categoryRepo.create).toHaveBeenCalledWith(expect.objectContaining({
+        slug: 'custom-slug',
+      }));
+    });
+
+    it('should use provided cadenceWarningDays', async () => {
+      const dto = { name: 'Skin', cadenceDays: 7, cadenceWarningDays: 5 };
+      categoryRepo.create.mockImplementation((d) => d);
+      categoryRepo.save.mockImplementation((e) => Promise.resolve(e));
+
+      await service.createCategory(dto as never);
+
+      expect(categoryRepo.create).toHaveBeenCalledWith(expect.objectContaining({
+        cadenceWarningDays: 5,
+      }));
+    });
+  });
+
+  describe('logCategory', () => {
+    it('should log a category entry', async () => {
+      categoryRepo.findOne.mockResolvedValue(makeCategory());
+      const savedLog = makeLog({ condition: SelfCareCondition.Excellent });
+      logRepo.create.mockReturnValue(savedLog);
+      logRepo.save.mockResolvedValue(savedLog);
+
+      const result = await service.logCategory(UUID_CAT1, { condition: SelfCareCondition.Excellent } as never);
+
+      expect(logRepo.create).toHaveBeenCalledWith(expect.objectContaining({
+        categoryId: UUID_CAT1,
+        condition: SelfCareCondition.Excellent,
+      }));
+      expect(result).toEqual(savedLog);
+    });
+
+    it('should emit self-care.logged and activity events', async () => {
+      categoryRepo.findOne.mockResolvedValue(makeCategory({ name: 'Haircut' }));
+      const savedLog = makeLog();
+      logRepo.create.mockReturnValue(savedLog);
+      logRepo.save.mockResolvedValue(savedLog);
+
+      await service.logCategory(UUID_CAT1, { condition: SelfCareCondition.Good } as never);
+
+      expect(eventEmitter.emit).toHaveBeenCalledWith(
+        'self-care.logged',
+        expect.objectContaining({ categoryId: UUID_CAT1 }),
+      );
+      expect(eventEmitter.emit).toHaveBeenCalledWith(
+        'activity',
+        expect.objectContaining({ content: expect.stringContaining('Haircut') }),
+      );
+    });
+
+    it('should mark entry as backdated when loggedAt is more than 1 hour ago', async () => {
+      categoryRepo.findOne.mockResolvedValue(makeCategory());
+      logRepo.create.mockImplementation((d) => d);
+      logRepo.save.mockImplementation((e) => Promise.resolve(e));
+
+      const twoHoursAgo = new Date(Date.now() - 2 * 60 * 60 * 1000).toISOString();
+
+      await service.logCategory(UUID_CAT1, {
+        condition: SelfCareCondition.Good,
+        loggedAt: twoHoursAgo,
+      } as never);
+
+      expect(logRepo.create).toHaveBeenCalledWith(expect.objectContaining({
+        isBackdated: true,
+      }));
+    });
+
+    it('should not mark as backdated when loggedAt is recent', async () => {
+      categoryRepo.findOne.mockResolvedValue(makeCategory());
+      logRepo.create.mockImplementation((d) => d);
+      logRepo.save.mockImplementation((e) => Promise.resolve(e));
+
+      await service.logCategory(UUID_CAT1, {
+        condition: SelfCareCondition.Baseline,
+      } as never);
+
+      expect(logRepo.create).toHaveBeenCalledWith(expect.objectContaining({
+        isBackdated: false,
+      }));
+    });
+
+    it('should throw NotFoundException for non-existent category', async () => {
+      categoryRepo.findOne.mockResolvedValue(null);
+
+      await expect(service.logCategory('nonexistent', { condition: 'good' } as never)).rejects.toThrow(NotFoundException);
+    });
+  });
+
+  describe('getCategoryLogs', () => {
+    it('should return paginated logs for a category', async () => {
+      categoryRepo.findOne.mockResolvedValue(makeCategory());
+      const logs = [makeLog(), makeLog({ id: UUID_2 })];
+      const qb = logRepo.createQueryBuilder();
+      qb.getManyAndCount.mockResolvedValue([logs, 2]);
+
+      const result = await service.getCategoryLogs(UUID_CAT1, {});
+
+      expect(qb.where).toHaveBeenCalledWith('log.categoryId = :categoryId', { categoryId: UUID_CAT1 });
+      expect(result.data).toHaveLength(2);
+      expect(result.meta).toEqual({ page: 1, limit: 20, total: 2, totalPages: 1 });
+    });
+
+    it('should apply date range and condition filters', async () => {
+      categoryRepo.findOne.mockResolvedValue(makeCategory());
+      const qb = logRepo.createQueryBuilder();
+      qb.getManyAndCount.mockResolvedValue([[], 0]);
+
+      await service.getCategoryLogs(UUID_CAT1, {
+        dateStart: '2026-01-01',
+        dateEnd: '2026-03-31',
+        condition: SelfCareCondition.Good,
+      });
+
+      expect(qb.andWhere).toHaveBeenCalledWith('log.loggedAt >= :dateStart', { dateStart: '2026-01-01' });
+      expect(qb.andWhere).toHaveBeenCalledWith('log.loggedAt <= :dateEnd', { dateEnd: '2026-03-31' });
+      expect(qb.andWhere).toHaveBeenCalledWith('log.condition = :condition', { condition: SelfCareCondition.Good });
+    });
+
+    it('should throw NotFoundException for non-existent category', async () => {
+      categoryRepo.findOne.mockResolvedValue(null);
+
+      await expect(service.getCategoryLogs('nonexistent', {})).rejects.toThrow(NotFoundException);
+    });
+  });
+
+  describe('getStatusBoard', () => {
+    it('should return empty array when no active categories', async () => {
+      categoryRepo.find.mockResolvedValue([]);
+
+      const result = await service.getStatusBoard();
+
+      expect(result).toEqual([]);
+    });
+
+    it('should mark overdue categories', async () => {
+      const cat = makeCategory({ cadenceDays: 7, cadenceWarningDays: 5 });
+      categoryRepo.find.mockResolvedValue([cat]);
+
+      // Last log was 10 days ago
+      const tenDaysAgo = new Date(Date.now() - 10 * 24 * 60 * 60 * 1000);
+      logRepo.findOne.mockResolvedValue(makeLog({ loggedAt: tenDaysAgo }));
+
+      // computeStreak needs these
+      categoryRepo.findOne.mockResolvedValue(cat);
+      logRepo.find.mockResolvedValue([makeLog({ loggedAt: tenDaysAgo })]);
+
+      const result = await service.getStatusBoard();
+
+      expect(result).toHaveLength(1);
+      expect(result[0].isOverdue).toBe(true);
+      expect(result[0].isWarning).toBe(false);
+    });
+
+    it('should mark warning categories', async () => {
+      const cat = makeCategory({ cadenceDays: 10, cadenceWarningDays: 7 });
+      categoryRepo.find.mockResolvedValue([cat]);
+
+      // Last log was 8 days ago (within cadence but past warning)
+      const eightDaysAgo = new Date(Date.now() - 8 * 24 * 60 * 60 * 1000);
+      logRepo.findOne.mockResolvedValue(makeLog({ loggedAt: eightDaysAgo }));
+
+      categoryRepo.findOne.mockResolvedValue(cat);
+      logRepo.find.mockResolvedValue([makeLog({ loggedAt: eightDaysAgo })]);
+
+      const result = await service.getStatusBoard();
+
+      expect(result).toHaveLength(1);
+      expect(result[0].isOverdue).toBe(false);
+      expect(result[0].isWarning).toBe(true);
+    });
+
+    it('should handle never-logged categories', async () => {
+      const cat = makeCategory();
+      categoryRepo.find.mockResolvedValue([cat]);
+      logRepo.findOne.mockResolvedValue(null);
+
+      categoryRepo.findOne.mockResolvedValue(cat);
+      logRepo.find.mockResolvedValue([]);
+
+      const result = await service.getStatusBoard();
+
+      expect(result).toHaveLength(1);
+      expect(result[0].daysSince).toBeNull();
+      expect(result[0].lastLog).toBeNull();
+    });
+
+    it('should sort: overdue first, then warning, then ok, then never-logged', async () => {
+      const catOverdue = makeCategory({ id: UUID_1, name: 'Overdue', cadenceDays: 5, cadenceWarningDays: 3 });
+      const catWarning = makeCategory({ id: UUID_2, name: 'Warning', cadenceDays: 10, cadenceWarningDays: 5 });
+      const catNeverLogged = makeCategory({ id: UUID_3, name: 'Never' });
+      categoryRepo.find.mockResolvedValue([catNeverLogged, catWarning, catOverdue]);
+
+      const tenDaysAgo = new Date(Date.now() - 10 * 24 * 60 * 60 * 1000);
+      const sixDaysAgo = new Date(Date.now() - 6 * 24 * 60 * 60 * 1000);
+
+      logRepo.findOne.mockImplementation(({ where }: { where: { categoryId: string } }) => {
+        if (where.categoryId === UUID_1) return Promise.resolve(makeLog({ loggedAt: tenDaysAgo }));
+        if (where.categoryId === UUID_2) return Promise.resolve(makeLog({ loggedAt: sixDaysAgo }));
+        return Promise.resolve(null);
+      });
+
+      categoryRepo.findOne.mockImplementation(({ where }: { where: { id: string } }) => {
+        if (where.id === UUID_1) return Promise.resolve(catOverdue);
+        if (where.id === UUID_2) return Promise.resolve(catWarning);
+        if (where.id === UUID_3) return Promise.resolve(catNeverLogged);
+        return Promise.resolve(null);
+      });
+
+      logRepo.find.mockImplementation(({ where }: { where: { categoryId: string } }) => {
+        if (where.categoryId === UUID_1) return Promise.resolve([makeLog({ loggedAt: tenDaysAgo })]);
+        if (where.categoryId === UUID_2) return Promise.resolve([makeLog({ loggedAt: sixDaysAgo })]);
+        return Promise.resolve([]);
+      });
+
+      const result = await service.getStatusBoard();
+
+      expect(result).toHaveLength(3);
+      expect(result[0].isOverdue).toBe(true);
+      expect(result[1].isWarning).toBe(true);
+      expect(result[2].daysSince).toBeNull();
+    });
+  });
+
+  describe('getCategoryStats', () => {
+    it('should return stats with zero values when no logs', async () => {
+      categoryRepo.findOne.mockResolvedValue(makeCategory({ cadenceDays: 14 }));
+      logRepo.find.mockResolvedValue([]);
+
+      const result = await service.getCategoryStats(UUID_CAT1);
+
+      expect(result.totalLogs).toBe(0);
+      expect(result.streakCount).toBe(0);
+      expect(result.avgDaysBetweenLogs).toBeNull();
+      expect(result.targetCadence).toBe(14);
+      expect(result.conditionBreakdown).toEqual({});
+    });
+
+    it('should calculate condition breakdown and average gap', async () => {
+      const cat = makeCategory({ cadenceDays: 7 });
+      categoryRepo.findOne.mockResolvedValue(cat);
+
+      const now = new Date();
+      const logs = [
+        makeLog({ loggedAt: new Date(now.getTime() - 1 * 24 * 60 * 60 * 1000), condition: SelfCareCondition.Good }),
+        makeLog({ loggedAt: new Date(now.getTime() - 4 * 24 * 60 * 60 * 1000), condition: SelfCareCondition.Excellent }),
+        makeLog({ loggedAt: new Date(now.getTime() - 10 * 24 * 60 * 60 * 1000), condition: SelfCareCondition.Good }),
+      ];
+      logRepo.find.mockResolvedValue(logs);
+
+      const result = await service.getCategoryStats(UUID_CAT1);
+
+      expect(result.totalLogs).toBe(3);
+      expect(result.conditionBreakdown).toEqual({
+        [SelfCareCondition.Good]: 2,
+        [SelfCareCondition.Excellent]: 1,
+      });
+      expect(result.avgDaysBetweenLogs).toBeGreaterThan(0);
+    });
+
+    it('should throw NotFoundException for non-existent category', async () => {
+      categoryRepo.findOne.mockResolvedValue(null);
+
+      await expect(service.getCategoryStats('nonexistent')).rejects.toThrow(NotFoundException);
+    });
+  });
+
+  describe('computeStreak', () => {
+    it('should return 0 when no logs', async () => {
+      categoryRepo.findOne.mockResolvedValue(makeCategory());
+      logRepo.find.mockResolvedValue([]);
+
+      const result = await service.computeStreak(UUID_CAT1);
+
+      expect(result).toBe(0);
+    });
+
+    it('should return 0 for non-existent category', async () => {
+      categoryRepo.findOne.mockResolvedValue(null);
+
+      const result = await service.computeStreak('nonexistent');
+
+      expect(result).toBe(0);
+    });
+
+    it('should count consecutive logs within cadence', async () => {
+      const cat = makeCategory({ cadenceDays: 7 });
+      categoryRepo.findOne.mockResolvedValue(cat);
+
+      const now = new Date();
+      const logs = [
+        makeLog({ loggedAt: new Date(now.getTime() - 1 * 24 * 60 * 60 * 1000) }),
+        makeLog({ loggedAt: new Date(now.getTime() - 5 * 24 * 60 * 60 * 1000) }),
+        makeLog({ loggedAt: new Date(now.getTime() - 12 * 24 * 60 * 60 * 1000) }),
+      ];
+      logRepo.find.mockResolvedValue(logs);
+
+      const result = await service.computeStreak(UUID_CAT1);
+
+      // All gaps are within cadenceDays+1 = 8 days
+      expect(result).toBe(3);
+    });
+
+    it('should break streak when gap exceeds cadence', async () => {
+      const cat = makeCategory({ cadenceDays: 3 });
+      categoryRepo.findOne.mockResolvedValue(cat);
+
+      const now = new Date();
+      const logs = [
+        makeLog({ loggedAt: new Date(now.getTime() - 1 * 24 * 60 * 60 * 1000) }),
+        makeLog({ loggedAt: new Date(now.getTime() - 3 * 24 * 60 * 60 * 1000) }),
+        makeLog({ loggedAt: new Date(now.getTime() - 20 * 24 * 60 * 60 * 1000) }),
+      ];
+      logRepo.find.mockResolvedValue(logs);
+
+      const result = await service.computeStreak(UUID_CAT1);
+
+      // First gap is 2 days (within cadence+1=4), second gap is 17 days (exceeds)
+      expect(result).toBe(2);
+    });
+  });
+
+  describe('findBySlug', () => {
+    it('should return a category by slug', async () => {
+      const cat = makeCategory({ slug: 'haircut' });
+      categoryRepo.findOne.mockResolvedValue(cat);
+
+      const result = await service.findBySlug('haircut');
+
+      expect(categoryRepo.findOne).toHaveBeenCalledWith({ where: { slug: 'haircut' } });
+      expect(result).toEqual(cat);
+    });
+
+    it('should throw NotFoundException for non-existent slug', async () => {
+      categoryRepo.findOne.mockResolvedValue(null);
+
+      await expect(service.findBySlug('nonexistent')).rejects.toThrow(NotFoundException);
+    });
+  });
+});
+
+describe('SelfCareBaselineService', () => {
+  let service: SelfCareBaselineService;
+  let baselineRepo: MockRepository;
+  let selfCareService: {
+    getStatusBoard: jest.Mock;
+    findOne: jest.Mock;
+  };
+
+  beforeEach(async () => {
+    baselineRepo = mockRepository();
+    selfCareService = {
+      getStatusBoard: jest.fn(),
+      findOne: jest.fn(),
+    };
+
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        SelfCareBaselineService,
+        { provide: getRepositoryToken(SelfCareBaseline), useValue: baselineRepo },
+        { provide: SelfCareService, useValue: selfCareService },
+      ],
+    }).compile();
+
+    service = module.get(SelfCareBaselineService);
+  });
+
+  describe('capture', () => {
+    it('should capture a baseline snapshot from status board', async () => {
+      selfCareService.getStatusBoard.mockResolvedValue([
+        {
+          category: makeCategory({ id: UUID_CAT1, name: 'Haircut' }),
+          daysSince: 5,
+          isOverdue: false,
+          isWarning: false,
+          lastLog: makeLog({ condition: SelfCareCondition.Good, loggedAt: new Date('2026-03-17') }),
+          streakCount: 3,
+        },
+      ]);
+      const created = makeBaseline({ name: 'March Baseline' });
+      baselineRepo.create.mockReturnValue(created);
+      baselineRepo.save.mockResolvedValue(created);
+
+      const result = await service.capture({ name: 'March Baseline' } as never);
+
+      expect(baselineRepo.create).toHaveBeenCalledWith(expect.objectContaining({
+        name: 'March Baseline',
+        snapshot: expect.arrayContaining([
+          expect.objectContaining({
+            categoryId: UUID_CAT1,
+            categoryName: 'Haircut',
+            condition: SelfCareCondition.Good,
+          }),
+        ]),
+      }));
+      expect(result).toEqual(created);
+    });
+  });
+
+  describe('findAll', () => {
+    it('should return all baselines ordered by takenAt DESC', async () => {
+      const baselines = [makeBaseline(), makeBaseline({ id: UUID_2 })];
+      baselineRepo.find.mockResolvedValue(baselines);
+
+      const result = await service.findAll();
+
+      expect(baselineRepo.find).toHaveBeenCalledWith({ order: { takenAt: 'DESC' } });
+      expect(result).toHaveLength(2);
+    });
+  });
+
+  describe('findOne', () => {
+    it('should return a baseline by id', async () => {
+      const baseline = makeBaseline();
+      baselineRepo.findOne.mockResolvedValue(baseline);
+
+      const result = await service.findOne(UUID_1);
+
+      expect(result).toEqual(baseline);
+    });
+
+    it('should throw NotFoundException for non-existent baseline', async () => {
+      baselineRepo.findOne.mockResolvedValue(null);
+
+      await expect(service.findOne('nonexistent')).rejects.toThrow(NotFoundException);
+    });
+  });
+
+  describe('compare', () => {
+    it('should compare two baselines and detect improvements', async () => {
+      const snapshotA: BaselineSnapshotEntry[] = [
+        { categoryId: UUID_CAT1, categoryName: 'Haircut', daysSinceLog: 5, condition: SelfCareCondition.Baseline, lastLoggedAt: '2026-03-10' },
+      ];
+      const snapshotB: BaselineSnapshotEntry[] = [
+        { categoryId: UUID_CAT1, categoryName: 'Haircut', daysSinceLog: 2, condition: SelfCareCondition.Good, lastLoggedAt: '2026-03-20' },
+      ];
+
+      baselineRepo.findOne
+        .mockResolvedValueOnce(makeBaseline({ id: UUID_1, snapshot: snapshotA }))
+        .mockResolvedValueOnce(makeBaseline({ id: UUID_2, snapshot: snapshotB }));
+
+      const result = await service.compare(UUID_1, UUID_2);
+
+      expect(result).toHaveLength(1);
+      expect(result[0].change).toBe('improved');
+      expect(result[0].ordinalDiff).toBe(1);
+    });
+
+    it('should detect declines', async () => {
+      const snapshotA: BaselineSnapshotEntry[] = [
+        { categoryId: UUID_CAT1, categoryName: 'Haircut', daysSinceLog: 2, condition: SelfCareCondition.Excellent, lastLoggedAt: '2026-03-10' },
+      ];
+      const snapshotB: BaselineSnapshotEntry[] = [
+        { categoryId: UUID_CAT1, categoryName: 'Haircut', daysSinceLog: 10, condition: SelfCareCondition.Rough, lastLoggedAt: '2026-03-20' },
+      ];
+
+      baselineRepo.findOne
+        .mockResolvedValueOnce(makeBaseline({ id: UUID_1, snapshot: snapshotA }))
+        .mockResolvedValueOnce(makeBaseline({ id: UUID_2, snapshot: snapshotB }));
+
+      const result = await service.compare(UUID_1, UUID_2);
+
+      expect(result[0].change).toBe('declined');
+      expect(result[0].ordinalDiff).toBe(-3);
+    });
+
+    it('should detect unchanged conditions', async () => {
+      const snapshot: BaselineSnapshotEntry[] = [
+        { categoryId: UUID_CAT1, categoryName: 'Haircut', daysSinceLog: 3, condition: SelfCareCondition.Good, lastLoggedAt: '2026-03-10' },
+      ];
+
+      baselineRepo.findOne
+        .mockResolvedValueOnce(makeBaseline({ id: UUID_1, snapshot }))
+        .mockResolvedValueOnce(makeBaseline({ id: UUID_2, snapshot }));
+
+      const result = await service.compare(UUID_1, UUID_2);
+
+      expect(result[0].change).toBe('unchanged');
+      expect(result[0].ordinalDiff).toBe(0);
+    });
+
+    it('should return unknown when condition data is missing', async () => {
+      const snapshotA: BaselineSnapshotEntry[] = [
+        { categoryId: UUID_CAT1, categoryName: 'Haircut', daysSinceLog: null, condition: null, lastLoggedAt: null },
+      ];
+      const snapshotB: BaselineSnapshotEntry[] = [
+        { categoryId: UUID_CAT1, categoryName: 'Haircut', daysSinceLog: 5, condition: SelfCareCondition.Good, lastLoggedAt: '2026-03-20' },
+      ];
+
+      baselineRepo.findOne
+        .mockResolvedValueOnce(makeBaseline({ id: UUID_1, snapshot: snapshotA }))
+        .mockResolvedValueOnce(makeBaseline({ id: UUID_2, snapshot: snapshotB }));
+
+      const result = await service.compare(UUID_1, UUID_2);
+
+      expect(result[0].change).toBe('unknown');
+      expect(result[0].ordinalDiff).toBe(0);
+    });
+  });
+});