feat: add pricing observation API

Add seller-owned pricing observation persistence, median market valuation calculation, admin routes, contracts, validation, migration, and focused tests.

apps/api/src/app/build-app.js

@@ -17,6 +17,7 @@ import { registerPublicSellerRoutes } from '../modules/sellers/routes/public-sel
 import { registerAdminSaleRoutes } from '../modules/sales/routes/admin-sale-routes.js';
 import { registerAdminAcquisitionRoutes } from '../modules/acquisitions/routes/admin-acquisition-routes.js';
 import { registerAdminDashboardRoutes } from '../modules/dashboard/routes/admin-dashboard-routes.js';
+import { registerAdminPricingRoutes } from '../modules/pricing/routes/admin-pricing-routes.js';
 
 export function buildApp(dependencies) {
   const app = Fastify();
@@ -76,6 +77,10 @@ export function buildApp(dependencies) {
     ...dependencies,
     prefix: '/api/v1/admin',
   });
+  app.register(registerAdminPricingRoutes, {
+    ...dependencies,
+    prefix: '/api/v1/admin',
+  });
   app.register(registerPublicSearchRoutes, {
     ...dependencies,
     prefix: '/api/v1',

apps/api/src/app/server.js

@@ -42,6 +42,8 @@ import { createSaleService } from '../modules/sales/services/sale-service.js';
 import { createAcquisitionRepository } from '../modules/acquisitions/repositories/acquisition-repository.js';
 import { createAcquisitionService } from '../modules/acquisitions/services/acquisition-service.js';
 import { createDashboardService } from '../modules/dashboard/services/dashboard-service.js';
+import { createPricingRepository } from '../modules/pricing/repositories/pricing-repository.js';
+import { createPricingService } from '../modules/pricing/services/pricing-service.js';
 
 function parsePort(value) {
   const port = Number.parseInt(value ?? '3000', 10);
@@ -67,6 +69,7 @@ async function startServer() {
   const conditionRepository = createConditionRepository(database.db);
   const saleRepository = createSaleRepository(database.db);
   const acquisitionRepository = createAcquisitionRepository(database.db);
+  const pricingRepository = createPricingRepository(database.db);
   const userRepository = createUserRepository(database.db);
   const sessionRepository = createSessionRepository(database.db);
   const passwordResetRepository = createPasswordResetRepository(database.db);
@@ -131,6 +134,7 @@ async function startServer() {
       saleService: createSaleService({ saleRepository }),
       acquisitionService: createAcquisitionService({ acquisitionRepository }),
     }),
+    pricingService: createPricingService({ pricingRepository }),
     publicListingService: createPublicListingService({ listingRepository, publicImageService }),
     productService: createProductService({ productRepository }),
     publicProductService: createPublicProductService({ productRepository }),

apps/api/src/infrastructure/database/schema.js

@@ -261,6 +261,34 @@ export const acquisitions = pgTable('acquisitions', {
   ...timestamps,
 });
 
+export const pricingObservations = pgTable('pricing_observations', {
+  id: uuid('id').defaultRandom().primaryKey(),
+  productId: uuid('product_id').notNull().references(() => products.id),
+  inventoryItemId: uuid('inventory_item_id').notNull().references(() => inventoryItems.id),
+  providerId: text('provider_id').notNull(),
+  priceMinor: integer('price_minor').notNull(),
+  currency: text('currency').notNull(),
+  sourceIdentifier: text('source_identifier').notNull(),
+  conditionId: uuid('condition_id').notNull().references(() => conditions.id),
+  sourceUrl: text('source_url'),
+  qualityScore: integer('quality_score'),
+  isOutlier: boolean('is_outlier').default(false).notNull(),
+  outlierReason: text('outlier_reason'),
+  observedAt: timestamp('observed_at', { withTimezone: true }).defaultNow().notNull(),
+  ...timestamps,
+}, (table) => [index('pricing_observations_inventory_item_id_index').on(table.inventoryItemId)]);
+
+export const marketValuations = pgTable('market_valuations', {
+  id: uuid('id').defaultRandom().primaryKey(),
+  inventoryItemId: uuid('inventory_item_id').notNull().references(() => inventoryItems.id),
+  valueMinor: integer('value_minor').notNull(),
+  currency: text('currency').notNull(),
+  strategy: text('strategy').notNull(),
+  confidence: text('confidence').notNull(),
+  sourceCount: integer('source_count').notNull(),
+  calculatedAt: timestamp('calculated_at', { withTimezone: true }).defaultNow().notNull(),
+});
+
 export const inventoryImages = pgTable(
   'inventory_images',
   {

apps/api/src/modules/pricing/repositories/pricing-repository.js

@@ -0,0 +1,43 @@
+import { and, desc, eq } from 'drizzle-orm';
+
+import { inventoryItems, marketValuations, pricingObservations, products } from '../../../infrastructure/database/schema.js';
+
+export function createPricingRepository(db) {
+  return {
+    async addObservationForSeller({ observation, sellerId }) {
+      const [ownedItem] = await db
+        .select({ id: inventoryItems.id, productId: inventoryItems.productId })
+        .from(inventoryItems)
+        .innerJoin(products, eq(products.id, inventoryItems.productId))
+        .where(and(eq(inventoryItems.id, observation.inventoryItemId), eq(products.sellerId, sellerId)));
+      if (!ownedItem || ownedItem.productId !== observation.productId) return { status: 'NOT_FOUND' };
+      const [created] = await db.insert(pricingObservations).values(observation).returning();
+      return { status: 'CREATED', observation: created };
+    },
+
+    async calculateForSeller({ inventoryItemId, sellerId, strategy = 'MEDIAN' }) {
+      const [ownedItem] = await db
+        .select({ id: inventoryItems.id })
+        .from(inventoryItems)
+        .innerJoin(products, eq(products.id, inventoryItems.productId))
+        .where(and(eq(inventoryItems.id, inventoryItemId), eq(products.sellerId, sellerId)));
+      if (!ownedItem) return { status: 'NOT_FOUND' };
+      const observations = await db.select().from(pricingObservations)
+        .where(and(eq(pricingObservations.inventoryItemId, inventoryItemId), eq(pricingObservations.isOutlier, false)))
+        .orderBy(desc(pricingObservations.observedAt));
+      if (!observations.length) return { status: 'NO_DATA' };
+      const prices = observations.map(({ priceMinor }) => priceMinor).sort((left, right) => left - right);
+      const middle = Math.floor(prices.length / 2);
+      const valueMinor = prices.length % 2 ? prices[middle] : Math.round((prices[middle - 1] + prices[middle]) / 2);
+      const [valuation] = await db.insert(marketValuations).values({
+        inventoryItemId,
+        valueMinor,
+        currency: 'USD',
+        strategy,
+        confidence: observations.length === 1 ? 'LOW' : 'MEDIUM',
+        sourceCount: observations.length,
+      }).returning();
+      return { status: 'CALCULATED', valuation, observations };
+    },
+  };
+}

apps/api/src/modules/pricing/routes/admin-pricing-routes.js

@@ -0,0 +1,42 @@
+import { toAdminMarketValuationDto, toAdminPricingObservationDto } from '@pokemon-inventory/contracts/pricing';
+import { createPricingObservationSchema } from '@pokemon-inventory/validation/pricing';
+
+import { createApplicationError } from '../../../shared/errors/application-error.js';
+
+function validationError(reply, result) {
+  return reply.code(400).send({
+    error: {
+      code: 'VALIDATION_ERROR',
+      message: 'Request validation failed.',
+      details: result.error.issues.map(({ message, path }) => ({ message, path })),
+    },
+  });
+}
+
+export async function registerAdminPricingRoutes(app, options) {
+  const {
+    authenticateAdmin = async () => { throw createApplicationError('UNAUTHORIZED', 'Authentication is required.', 401); },
+    authorizeUnsafeRequest,
+    sessionCookieName = 'pokemon_inventory_session',
+    pricingService,
+  } = options;
+
+  app.addHook('preHandler', async (request) => {
+    const admin = await authenticateAdmin(request);
+    if (!admin?.sellerId) throw createApplicationError('UNAUTHORIZED', 'Authentication is required.', 401);
+    request.admin = admin;
+  });
+
+  app.post('/pricing/observations', async (request, reply) => {
+    await authorizeUnsafeRequest?.(request.cookies[sessionCookieName], request.headers['x-csrf-token']);
+    const result = createPricingObservationSchema.safeParse(request.body);
+    if (!result.success) return validationError(reply, result);
+    const observation = await pricingService.addObservation({ ...result.data, sellerId: request.admin.sellerId });
+    return reply.code(201).send({ data: toAdminPricingObservationDto(observation) });
+  });
+
+  app.post('/inventory/:id/valuation', async (request, reply) => {
+    const valuation = await pricingService.calculate({ sellerId: request.admin.sellerId, inventoryItemId: request.params.id });
+    return reply.code(200).send({ data: toAdminMarketValuationDto(valuation) });
+  });
+}

apps/api/src/modules/pricing/services/pricing-service.js

@@ -0,0 +1,20 @@
+import { createPricingObservation } from '../domain/pricing-observation.js';
+import { createApplicationError } from '../../../shared/errors/application-error.js';
+
+export function createPricingService({ pricingRepository }) {
+  return {
+    async addObservation({ sellerId, ...input }) {
+      const observation = createPricingObservation(input);
+      const result = await pricingRepository.addObservationForSeller({ observation, sellerId });
+      if (result.status === 'NOT_FOUND') throw createApplicationError('INVENTORY_NOT_FOUND', 'Inventory item was not found.', 404);
+      return result.observation;
+    },
+
+    async calculate({ sellerId, inventoryItemId }) {
+      const result = await pricingRepository.calculateForSeller({ sellerId, inventoryItemId });
+      if (result.status === 'NOT_FOUND') throw createApplicationError('INVENTORY_NOT_FOUND', 'Inventory item was not found.', 404);
+      if (result.status === 'NO_DATA') throw createApplicationError('PRICING_DATA_UNAVAILABLE', 'No pricing observations are available.', 404);
+      return result;
+    },
+  };
+}