apps/api/drizzle/0015_oem_votes.sql

@@ -0,0 +1,37 @@
+-- OEM community voting + gamification ledger.
+-- oem_votes: one row per (user, oem_code) uyumlu/uyumsuz verdict cast from the
+-- catalog part rows. Votes pool globally per code; part/vehicle/category are
+-- analytics breadcrumbs only (catalog routes pass catalog_vehicles ids → no FK,
+-- mirrors oem_code_copies). Re-votes update the row in place.
+-- oem_vote_points: append-only, exactly one row per vote (vote_id unique),
+-- written in the same transaction. points = 1 (vote) + 2 (agreed with strict
+-- majority at cast time; first voter always 3). Never retro-adjusted.
+CREATE TABLE "oem_votes" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"user_id" uuid NOT NULL,
+	"oem_code" varchar(100) NOT NULL,
+	"vote" varchar(12) NOT NULL,
+	"part_id" uuid,
+	"vehicle_id" uuid,
+	"category_id" uuid,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL,
+	"updated_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE "oem_vote_points" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"user_id" uuid NOT NULL,
+	"vote_id" uuid NOT NULL,
+	"oem_code" varchar(100) NOT NULL,
+	"points" integer NOT NULL,
+	"correct" boolean DEFAULT false NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "oem_votes" ADD CONSTRAINT "oem_votes_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "oem_vote_points" ADD CONSTRAINT "oem_vote_points_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+ALTER TABLE "oem_vote_points" ADD CONSTRAINT "oem_vote_points_vote_id_oem_votes_id_fk" FOREIGN KEY ("vote_id") REFERENCES "public"."oem_votes"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE UNIQUE INDEX "oem_votes_user_oem_idx" ON "oem_votes" USING btree ("user_id","oem_code");--> statement-breakpoint
+CREATE INDEX "oem_votes_oem_code_idx" ON "oem_votes" USING btree ("oem_code");--> statement-breakpoint
+CREATE UNIQUE INDEX "oem_vote_points_vote_id_idx" ON "oem_vote_points" USING btree ("vote_id");--> statement-breakpoint
+CREATE INDEX "oem_vote_points_user_id_idx" ON "oem_vote_points" USING btree ("user_id");

apps/api/drizzle/0016_oem_suggestions.sql

@@ -0,0 +1,18 @@
+-- Community OEM cross-reference suggestions, collected on the OEM detail page
+-- ("muadil parça öner": brand + code). Primarily for codes the P snapshot has
+-- no match for. suggested_code_norm (upper alphanumerics) powers grouping and
+-- the per-user dedup; status is a moderation hook (active|hidden).
+CREATE TABLE "oem_suggestions" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"user_id" uuid NOT NULL,
+	"oem_code" varchar(100) NOT NULL,
+	"brand" varchar(80) NOT NULL,
+	"suggested_code" varchar(100) NOT NULL,
+	"suggested_code_norm" varchar(100) NOT NULL,
+	"status" varchar(16) DEFAULT 'active' NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "oem_suggestions" ADD CONSTRAINT "oem_suggestions_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE UNIQUE INDEX "oem_suggestions_user_oem_code_idx" ON "oem_suggestions" USING btree ("user_id","oem_code","suggested_code_norm");--> statement-breakpoint
+CREATE INDEX "oem_suggestions_oem_code_idx" ON "oem_suggestions" USING btree ("oem_code");

apps/api/drizzle/0017_oem_expert_rewards.sql

@@ -0,0 +1,18 @@
+-- Monthly Parça Uzmanları prizes: one row per (TR-month, rank). Written by the
+-- expert-rewards cron (1st of month 00:00 Europe/Istanbul) when it closes the
+-- finished season and grants the top 3 voters a subscription extension
+-- (30/15/7 days). The unique index is the run-once guard — a re-run for the
+-- same period inserts nothing, so days are never granted twice.
+CREATE TABLE "oem_expert_rewards" (
+	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
+	"period_start" timestamp with time zone NOT NULL,
+	"user_id" uuid NOT NULL,
+	"rank" integer NOT NULL,
+	"points" integer NOT NULL,
+	"reward_days" integer NOT NULL,
+	"granted_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "oem_expert_rewards" ADD CONSTRAINT "oem_expert_rewards_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE UNIQUE INDEX "oem_expert_rewards_period_rank_idx" ON "oem_expert_rewards" USING btree ("period_start","rank");--> statement-breakpoint
+CREATE INDEX "oem_expert_rewards_user_id_idx" ON "oem_expert_rewards" USING btree ("user_id");

apps/api/drizzle/meta/_journal.json

@@ -106,6 +106,27 @@
       "when": 1781136000000,
       "tag": "0014_proxy_logs",
       "breakpoints": true
+    },
+    {
+      "idx": 15,
+      "version": "7",
+      "when": 1781222400000,
+      "tag": "0015_oem_votes",
+      "breakpoints": true
+    },
+    {
+      "idx": 16,
+      "version": "7",
+      "when": 1781308800000,
+      "tag": "0016_oem_suggestions",
+      "breakpoints": true
+    },
+    {
+      "idx": 17,
+      "version": "7",
+      "when": 1781395200000,
+      "tag": "0017_oem_expert_rewards",
+      "breakpoints": true
     }
   ]
 }

apps/api/src/app.module.ts

@@ -34,6 +34,8 @@ import { InternalAdminModule } from "./internal-admin/internal-admin.module";
 import { JobsModule } from "./jobs/jobs.module";
 import { MetaCapiModule } from "./meta-capi/meta-capi.module";
 import { NotificationsModule } from "./notifications/notifications.module";
+import { OemSuggestionsModule } from "./oem-suggestions/oem-suggestions.module";
+import { OemVotesModule } from "./oem-votes/oem-votes.module";
 import { PartsModule } from "./parts/parts.module";
 import { PaymentsModule } from "./payments/payments.module";
 import { PlansModule } from "./plans/plans.module";
@@ -93,6 +95,8 @@ import { VehiclesModule } from "./vehicles/vehicles.module";
     TranslationsModule,
     AdminModule,
     AnalyticsModule,
+    OemVotesModule,
+    OemSuggestionsModule,
     CatalogModule,
     ChangelogModule,
     ChatwootModule,

apps/api/src/categories/categories.service.spec.ts

@@ -320,6 +320,84 @@ describe("CategoriesService", () => {
         "drill-load-error",
       );
     });
+
+    it("routes a P4 Ford VIN node (json-vin-sub-group.action, positional link_wid) to children, not an empty leaf", async () => {
+      // link_wid "1" is a positional code (not a *Group* table) so the link_wid
+      // group-drill branch misses it; the path is …group.action (not /psa/, not
+      // vin-group.action) so the PSA / Volvo branches miss it too. Before the
+      // dedicated gate these fell through to the leaf parts path → silent empty
+      // panel (Ford/Nissan/Opel analog of the PSA-parent-gate gap).
+      const category = {
+        id: "ford1",
+        name: "elektrik sistemi",
+        nameOriginal: "elektrik sistemi",
+        parentId: null,
+        vehicleId: "v1",
+        source: "pl24",
+        linkPath: "/ford/fordp_parts/json-vin-sub-group.action?mainGroupId=CAP1&vin=WF0FXX",
+        linkWid: "1",
+        hasSubgroups: null,
+        hasParts: null,
+      };
+      let selectCall = 0;
+      const db = {
+        select: vi.fn().mockImplementation(() => {
+          selectCall++;
+          const captured = selectCall;
+          const c: Record<string, any> = {};
+          c.from = vi.fn().mockReturnValue(c);
+          c.where = vi.fn().mockImplementation(() => (captured === 2 ? [] : c));
+          c.limit = vi.fn().mockReturnValue([category]);
+          return c;
+        }),
+        execute: vi.fn().mockResolvedValue([]),
+      };
+      const { service } = createService(db);
+      const discovered = [{ id: "sg1", name: "kablolar", children: undefined }];
+      vi.spyOn(service, "getChildren").mockResolvedValue(discovered as any);
+
+      const result = await service.getCategoryWithParts("ford1");
+
+      expect(service.getChildren).toHaveBeenCalledWith("ford1");
+      expect(result.parts).toEqual([]);
+      expect((result as { children?: unknown }).children).toEqual(discovered);
+    });
+
+    it("surfaces loadError when a P4 group.action drill comes back empty (not a silent leaf)", async () => {
+      const category = {
+        id: "ford2",
+        name: "kaporta",
+        nameOriginal: "kaporta",
+        parentId: null,
+        vehicleId: "v1",
+        source: "pl24",
+        linkPath: "/ford/fordp_parts/json-vin-sub-group.action?mainGroupId=GDB&vin=WF0FXX",
+        linkWid: "2",
+        hasSubgroups: null,
+        hasParts: null,
+      };
+      let selectCall = 0;
+      const db = {
+        select: vi.fn().mockImplementation(() => {
+          selectCall++;
+          const captured = selectCall;
+          const c: Record<string, any> = {};
+          c.from = vi.fn().mockReturnValue(c);
+          c.where = vi.fn().mockImplementation(() => (captured === 2 ? [] : c));
+          c.limit = vi.fn().mockReturnValue([category]);
+          return c;
+        }),
+        execute: vi.fn().mockResolvedValue([]),
+      };
+      const { service } = createService(db);
+      vi.spyOn(service, "getChildren").mockResolvedValue([] as any);
+
+      const result = await service.getCategoryWithParts("ford2");
+
+      expect(service.getChildren).toHaveBeenCalledWith("ford2");
+      expect((result as { loadError?: boolean }).loadError).toBe(true);
+      expect((result as { children?: unknown }).children).toBeUndefined();
+    });
   });
 
   describe("getAncestors", () => {

apps/api/src/categories/categories.service.ts

@@ -120,6 +120,10 @@ export class CategoriesService {
               externalId: s.code,
               linkPath: s.linkPath || null,
               linkWid: null as string | null,
+              // PSA scopes are always parents (they hold main-groups, never direct
+              // parts) — flag them so the tree UI signposts them as folders and the
+              // prefetch worker pre-drills them instead of treating them as leaves.
+              hasSubgroups: true,
               source: "pl24" as const,
             }));
             dbCategories = await this.db
@@ -181,6 +185,10 @@ export class CategoriesService {
               externalId: c.code,
               linkPath: c.linkPath || null,
               linkWid: c.linkWid || null,
+              // Mark P4 VIN/legacy group-drill nodes (…group.action) as parents so
+              // the tree UI shows them as folders and prefetch pre-drills them. Leaf
+              // pages (image-board.action/bom) stay null (unknown→leaf downstream).
+              hasSubgroups: c.linkPath?.includes("group.action") ? true : null,
               source: "pl24" as const,
             }));
 
@@ -1123,6 +1131,39 @@ export class CategoriesService {
       // No subgroups → leaf; fall through to the parts path below.
     }
 
+    // PL24 P4 VIN / legacy group node whose link_wid is a positional code
+    // ("1","2","CAP1"…) rather than a *Group* table, so the link_wid branch above
+    // misses it, and which is neither PSA- nor Volvo-special. Its linkPath is a
+    // sub-group / main-group drill action (…group.action — never a parts leaf like
+    // image-board.action). This is the Ford / Nissan / Opel / Hyundai-Kia analog of
+    // the PSA-parent-gate gap: without it these VIN scopes ("mekanik", "kaporta",
+    // "Elektrikli aksam"…) fell through every parent branch to the leaf parts path,
+    // fetched no parts and rendered a silent empty panel — confirmed the dominant
+    // current "0 parça" cluster. Volvo's vin-group.action keeps its own branch above
+    // (it may legitimately bottom out in parts), so exclude it here. Drill on demand:
+    // subgroups → parent; an empty drill is a transient upstream failure → retryable
+    // load error (a group node is never legitimately a parts leaf).
+    if (
+      category.source === "pl24" &&
+      category.linkPath?.includes("group.action") &&
+      !category.linkPath.includes("vin-group.action") &&
+      category.vehicleId
+    ) {
+      const p4Children = await this.getChildren(categoryId);
+      const base = {
+        id: category.id,
+        name: category.name,
+        description: category.nameOriginal || null,
+        parentId: category.parentId || null,
+        parts: [],
+        schemaPics: [],
+        hotspots: [],
+      };
+      return p4Children.length > 0
+        ? { ...base, children: p4Children }
+        : { ...base, loadError: true };
+    }
+
     // EMEX Vehicle.aspx group node (linkWid="emex-group") — a parent, never a
     // parts leaf. Return its children (seeded sub-groups, or Unit leaves drilled
     // on demand by getChildren). Mirrors the pl24 group-node branch above; an

apps/api/src/database/schema/core.ts

@@ -655,3 +655,118 @@ export const proxyLogs = pgTable(
     index("proxy_logs_banned_created_at_idx").on(table.banned, table.createdAt),
   ],
 );
+
+// ─── OEM Votes (community compatibility verdicts) ─────
+// One row per (user, oemCode): a parts seller's uyumlu/uyumsuz verdict on an
+// OEM code, cast from the catalog part rows. Votes pool globally per code —
+// the part/vehicle/category columns are analytics breadcrumbs only (mirrors
+// oem_code_copies: catalog routes pass catalog_vehicles ids here, so no FK).
+// Re-voting updates `vote` in place; points are only ever granted on the
+// first insert (see oem_vote_points).
+export const oemVotes = pgTable(
+  "oem_votes",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    userId: uuid("user_id")
+      .notNull()
+      .references(() => users.id, { onDelete: "cascade" }),
+    oemCode: varchar("oem_code", { length: 100 }).notNull(),
+    // compatible | incompatible
+    vote: varchar("vote", { length: 12 }).notNull(),
+    partId: uuid("part_id"),
+    vehicleId: uuid("vehicle_id"),
+    categoryId: uuid("category_id"),
+    createdAt: timestamp("created_at", { withTimezone: true }).defaultNow().notNull(),
+    updatedAt: timestamp("updated_at", { withTimezone: true }).defaultNow().notNull(),
+  },
+  (table) => [
+    uniqueIndex("oem_votes_user_oem_idx").on(table.userId, table.oemCode),
+    index("oem_votes_oem_code_idx").on(table.oemCode),
+  ],
+);
+
+// ─── OEM Vote Points (gamification ledger) ────────────
+// Append-only: exactly one row per oem_votes row (vote_id unique), written in
+// the same transaction as the vote insert. `points` = 1 for voting +2 when
+// the vote agreed with the strict majority at cast time (first voter on a
+// code always agrees with themselves → 3). Awards are never retro-adjusted
+// when the majority later flips. Leaderboard = SUM(points) per user.
+export const oemVotePoints = pgTable(
+  "oem_vote_points",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    userId: uuid("user_id")
+      .notNull()
+      .references(() => users.id, { onDelete: "cascade" }),
+    voteId: uuid("vote_id")
+      .notNull()
+      .references(() => oemVotes.id, { onDelete: "cascade" }),
+    oemCode: varchar("oem_code", { length: 100 }).notNull(),
+    points: integer("points").notNull(),
+    correct: boolean("correct").default(false).notNull(),
+    createdAt: timestamp("created_at", { withTimezone: true }).defaultNow().notNull(),
+  },
+  (table) => [
+    uniqueIndex("oem_vote_points_vote_id_idx").on(table.voteId),
+    index("oem_vote_points_user_id_idx").on(table.userId),
+  ],
+);
+
+// ─── OEM Suggestions (community cross-references) ─────
+// Crowd-sourced equivalents for an OEM code: "this code's compatible part is
+// <brand> <suggestedCode>", collected on the OEM detail page — primarily for
+// codes the P snapshot can't match. suggestedCodeNorm (upper, alphanumerics
+// only) powers grouping and the per-user dedup constraint; display keeps the
+// submitted casing. `status` is a moderation hook (active|hidden) — no rows
+// are hidden automatically today.
+export const oemSuggestions = pgTable(
+  "oem_suggestions",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    userId: uuid("user_id")
+      .notNull()
+      .references(() => users.id, { onDelete: "cascade" }),
+    oemCode: varchar("oem_code", { length: 100 }).notNull(),
+    brand: varchar("brand", { length: 80 }).notNull(),
+    suggestedCode: varchar("suggested_code", { length: 100 }).notNull(),
+    suggestedCodeNorm: varchar("suggested_code_norm", { length: 100 }).notNull(),
+    status: varchar("status", { length: 16 }).default("active").notNull(),
+    createdAt: timestamp("created_at", { withTimezone: true }).defaultNow().notNull(),
+  },
+  (table) => [
+    uniqueIndex("oem_suggestions_user_oem_code_idx").on(
+      table.userId,
+      table.oemCode,
+      table.suggestedCodeNorm,
+    ),
+    index("oem_suggestions_oem_code_idx").on(table.oemCode),
+  ],
+);
+
+// ─── OEM Expert Rewards (monthly leaderboard prizes) ──
+// One row per (TR-month, rank): the expert-rewards cron (1st of month 00:00
+// Europe/Istanbul) closes the finished season and grants the top 3 voters a
+// subscription extension (30/15/7 days — EXPERT_REWARD_LADDER). The unique
+// index doubles as the run-once guard: a second run for the same period
+// inserts nothing, so days are never granted twice. Granting mirrors the
+// referral mechanic: extend a live active/trial sub, else bank the days in
+// users.referral_credit_days (consumed at next trial/activation).
+export const oemExpertRewards = pgTable(
+  "oem_expert_rewards",
+  {
+    id: uuid("id").primaryKey().defaultRandom(),
+    // TR-ayının başlangıcı (UTC timestamptz) — ödüllendirilen sezon.
+    periodStart: timestamp("period_start", { withTimezone: true }).notNull(),
+    userId: uuid("user_id")
+      .notNull()
+      .references(() => users.id, { onDelete: "cascade" }),
+    rank: integer("rank").notNull(),
+    points: integer("points").notNull(),
+    rewardDays: integer("reward_days").notNull(),
+    grantedAt: timestamp("granted_at", { withTimezone: true }).defaultNow().notNull(),
+  },
+  (table) => [
+    uniqueIndex("oem_expert_rewards_period_rank_idx").on(table.periodStart, table.rank),
+    index("oem_expert_rewards_user_id_idx").on(table.userId),
+  ],
+);

apps/api/src/jobs/bull.config.ts

@@ -27,4 +27,5 @@ export const QUEUE_NAMES = {
   CATALOG_PREFETCH: "catalog-prefetch",
   TRANSLATION: "translation",
   LIFECYCLE_EMAIL: "lifecycle-email",
+  EXPERT_REWARDS: "expert-rewards",
 } as const;

apps/api/src/jobs/jobs.module.ts

@@ -8,6 +8,7 @@ import {
   CatalogPrefetchQueueProvider,
 } from "./queues/catalog-prefetch.queue";
 import { EMEX_SCRAPE_QUEUE, EmexScrapeQueueProvider } from "./queues/emex-scrape.queue";
+import { EXPERT_REWARDS_QUEUE, ExpertRewardsQueueProvider } from "./queues/expert-rewards.queue";
 import { LIFECYCLE_EMAIL_QUEUE, LifecycleEmailQueueProvider } from "./queues/lifecycle-email.queue";
 import { QUERY_CLEANUP_QUEUE, QueryCleanupQueueProvider } from "./queues/query-cleanup.queue";
 import {
@@ -23,6 +24,7 @@ import {
     QueryCleanupQueueProvider,
     CatalogPrefetchQueueProvider,
     LifecycleEmailQueueProvider,
+    ExpertRewardsQueueProvider,
     PrefetchWorkerService,
   ],
   exports: [
@@ -31,6 +33,7 @@ import {
     QUERY_CLEANUP_QUEUE,
     CATALOG_PREFETCH_QUEUE,
     LIFECYCLE_EMAIL_QUEUE,
+    EXPERT_REWARDS_QUEUE,
   ],
 })
 export class JobsModule implements OnModuleInit, OnModuleDestroy {
@@ -39,6 +42,7 @@ export class JobsModule implements OnModuleInit, OnModuleDestroy {
     @Inject(QUERY_CLEANUP_QUEUE) private queryCleanupQueue: Queue,
     @Inject(CATALOG_PREFETCH_QUEUE) private catalogPrefetchQueue: Queue,
     @Inject(LIFECYCLE_EMAIL_QUEUE) private lifecycleEmailQueue: Queue,
+    @Inject(EXPERT_REWARDS_QUEUE) private expertRewardsQueue: Queue,
   ) {}
 
   async onModuleInit() {
@@ -124,6 +128,24 @@ export class JobsModule implements OnModuleInit, OnModuleDestroy {
       await this.catalogPrefetchQueue.removeJobScheduler("catalog-backfill-hourly").catch(() => {});
       console.log("[jobs] Skipped catalog-backfill cron (not prod host)");
     }
+
+    // Parça Uzmanları sezon kapanışı: her ayın 1'i 00:00 Türkiye saati —
+    // biten ayın ilk 3 oylayıcısına üyelik uzatması (30/15/7 gün). Ödül
+    // yalnız DB'ye yazar (dış yan etki yok), o yüzden dev'de de çalışır;
+    // (period, rank) unique index'i çift vermeyi zaten engeller.
+    await this.expertRewardsQueue.upsertJobScheduler(
+      "expert-rewards-monthly",
+      { pattern: "0 0 1 * *", tz: "Europe/Istanbul" },
+      {
+        name: "expert-rewards-grant",
+        data: {},
+        opts: {
+          removeOnComplete: { count: 24 },
+          removeOnFail: { count: 50 },
+        },
+      },
+    );
+    console.log("[jobs] Registered expert-rewards cron: 0 0 1 * * (Europe/Istanbul)");
   }
 
   async onModuleDestroy() {
@@ -132,6 +154,7 @@ export class JobsModule implements OnModuleInit, OnModuleDestroy {
       this.queryCleanupQueue.close(),
       this.catalogPrefetchQueue.close(),
       this.lifecycleEmailQueue.close(),
+      this.expertRewardsQueue.close(),
     ]);
   }
 }

apps/api/src/jobs/processors/expert-rewards.processor.ts

@@ -0,0 +1,114 @@
+import { Job } from "bullmq";
+import { and, asc, desc, eq, gte, lt, or, sql } from "drizzle-orm";
+import { PostgresJsDatabase } from "drizzle-orm/postgres-js";
+import {
+  oemExpertRewards,
+  oemVotePoints,
+  userSubscriptions,
+  users,
+} from "../../database/schema/core";
+import { EXPERT_REWARD_LADDER, previousTrMonthWindow } from "../../oem-votes/expert-period";
+
+type Database = PostgresJsDatabase<Record<string, unknown>>;
+
+// Parça Uzmanları sezon kapanışı: her ayın 1'i 00:00 TR'de biten ayın ilk 3
+// oylayıcısına üyelik uzatması (30/15/7 gün). oem_expert_rewards'taki
+// (period, rank) unique index run-once garantisidir — yeniden çalıştırma
+// (retry, elle tetik) hiçbir şeyi ikinci kez vermez.
+export async function processExpertRewards(
+  job: Job,
+  db: Database,
+): Promise<{ period: string; granted: number; skipped: boolean }> {
+  const { start, end } = previousTrMonthWindow(new Date());
+  const periodLabel = start.toISOString();
+  console.log(`[expert-rewards] Processing job ${job.id} for period ${periodLabel}`);
+
+  const [alreadyGranted] = await db
+    .select({ id: oemExpertRewards.id })
+    .from(oemExpertRewards)
+    .where(eq(oemExpertRewards.periodStart, start))
+    .limit(1);
+  if (alreadyGranted) {
+    console.log(`[expert-rewards] Period ${periodLabel} already granted — skipping`);
+    return { period: periodLabel, granted: 0, skipped: true };
+  }
+
+  // Biten sezonun ilk 3'ü — liderlik tablosuyla aynı sıralama: puan desc,
+  // eşitlikte puana daha erken ulaşan önde.
+  const totalPoints = sql<number>`sum(${oemVotePoints.points})::int`;
+  const top = await db
+    .select({ userId: oemVotePoints.userId, points: totalPoints })
+    .from(oemVotePoints)
+    .where(and(gte(oemVotePoints.createdAt, start), lt(oemVotePoints.createdAt, end)))
+    .groupBy(oemVotePoints.userId)
+    .orderBy(desc(totalPoints), asc(sql`min(${oemVotePoints.createdAt})`))
+    .limit(EXPERT_REWARD_LADDER.length);
+
+  if (top.length === 0) {
+    console.log(`[expert-rewards] No votes in period ${periodLabel} — nothing to grant`);
+    return { period: periodLabel, granted: 0, skipped: false };
+  }
+
+  let granted = 0;
+  for (let i = 0; i < top.length; i++) {
+    const winner = top[i];
+    const { rank, days } = EXPERT_REWARD_LADDER[i];
+
+    await db.transaction(async (tx) => {
+      const inserted = await tx
+        .insert(oemExpertRewards)
+        .values({
+          periodStart: start,
+          userId: winner.userId,
+          rank,
+          points: winner.points,
+          rewardDays: days,
+        })
+        .onConflictDoNothing()
+        .returning({ id: oemExpertRewards.id });
+      // Yarış/yeniden-deneme: kayıt zaten varsa gün de verilmiş demektir.
+      if (inserted.length === 0) return;
+
+      // Referral ödül mekaniğinin birebir kopyası (worker Nest DI'sız çalıştığı
+      // için ReferralsService.grantRewardDays buradan çağrılamıyor): canlı
+      // active/trial aboneliği uzat, yoksa günleri krediye banka et — kredi bir
+      // sonraki trial/aktivasyonda otomatik tüketilir.
+      const [sub] = await tx
+        .select({ id: userSubscriptions.id, endDate: userSubscriptions.endDate })
+        .from(userSubscriptions)
+        .where(
+          and(
+            eq(userSubscriptions.userId, winner.userId),
+            or(eq(userSubscriptions.status, "active"), eq(userSubscriptions.status, "trial")),
+          ),
+        )
+        .orderBy(desc(userSubscriptions.endDate))
+        .limit(1);
+
+      if (sub?.endDate) {
+        const newEnd = new Date(sub.endDate);
+        newEnd.setDate(newEnd.getDate() + days);
+        await tx
+          .update(userSubscriptions)
+          .set({ endDate: newEnd, updatedAt: new Date() })
+          .where(eq(userSubscriptions.id, sub.id));
+      } else {
+        await tx
+          .update(users)
+          .set({
+            referralCreditDays: sql`${users.referralCreditDays} + ${days}`,
+            updatedAt: new Date(),
+          })
+          .where(eq(users.id, winner.userId));
+      }
+
+      granted++;
+      console.log(
+        `[expert-rewards] rank=${rank} user=${winner.userId} points=${winner.points} +${days}d`,
+      );
+    });
+  }
+
+  console.log(`[expert-rewards] Period ${periodLabel}: granted ${granted} reward(s)`);
+  return { period: periodLabel, granted, skipped: false };
+}

apps/api/src/jobs/processors/lifecycle-email.processor.ts

@@ -67,17 +67,11 @@ async function sendTrialEnding(db: Database, now: Date): Promise<number> {
     .innerJoin(users, eq(userSubscriptions.userId, users.id))
     .leftJoin(
       emailPreferences,
-      and(
-        eq(emailPreferences.userId, users.id),
-        eq(emailPreferences.workflow, "trial-ending"),
-      ),
+      and(eq(emailPreferences.userId, users.id), eq(emailPreferences.workflow, "trial-ending")),
     )
     .leftJoin(
       lifecycleEmailSent,
-      and(
-        eq(lifecycleEmailSent.userId, users.id),
-        eq(lifecycleEmailSent.workflow, "trial-ending"),
-      ),
+      and(eq(lifecycleEmailSent.userId, users.id), eq(lifecycleEmailSent.workflow, "trial-ending")),
     )
     .where(
       and(
@@ -96,11 +90,7 @@ async function sendTrialEnding(db: Database, now: Date): Promise<number> {
       { subscriberId: r.userId, email: r.email, firstName: firstNameOf(r.name) },
       {
         daysLeft: 3,
-        ctaUrl: buildTrackedUrl(
-          "trial-ending",
-          r.email,
-          webUrl("/dashboard/subscription"),
-        ),
+        ctaUrl: buildTrackedUrl("trial-ending", r.email, webUrl("/dashboard/subscription")),
         ...(trackPixel ? { trackPixel } : {}),
       },
     );
@@ -134,17 +124,11 @@ async function sendWinBack(db: Database, now: Date): Promise<number> {
     .innerJoin(users, eq(userSubscriptions.userId, users.id))
     .leftJoin(
       emailPreferences,
-      and(
-        eq(emailPreferences.userId, users.id),
-        eq(emailPreferences.workflow, "win-back"),
-      ),
+      and(eq(emailPreferences.userId, users.id), eq(emailPreferences.workflow, "win-back")),
     )
     .leftJoin(
       lifecycleEmailSent,
-      and(
-        eq(lifecycleEmailSent.userId, users.id),
-        eq(lifecycleEmailSent.workflow, "win-back"),
-      ),
+      and(eq(lifecycleEmailSent.userId, users.id), eq(lifecycleEmailSent.workflow, "win-back")),
     )
     .where(
       and(

apps/api/src/jobs/queues/expert-rewards.queue.ts

@@ -0,0 +1,25 @@
+import { Provider } from "@nestjs/common";
+import { Queue } from "bullmq";
+import { QUEUE_NAMES, getBullConnection, getBullTelemetry } from "../bull.config";
+
+export const EXPERT_REWARDS_QUEUE = "EXPERT_REWARDS_QUEUE";
+
+export const ExpertRewardsQueueProvider: Provider = {
+  provide: EXPERT_REWARDS_QUEUE,
+  useFactory: () => {
+    const telemetry = getBullTelemetry();
+    return new Queue(QUEUE_NAMES.EXPERT_REWARDS, {
+      connection: getBullConnection(),
+      ...(telemetry ? { telemetry } : {}),
+      defaultJobOptions: {
+        attempts: 3,
+        backoff: {
+          type: "exponential",
+          delay: 10000,
+        },
+        removeOnComplete: { count: 100 },
+        removeOnFail: { count: 200 },
+      },
+    });
+  },
+};

apps/api/src/oem-suggestions/oem-suggestions.controller.ts

@@ -0,0 +1,35 @@
+import { BadRequestException, Body, Controller, Get, Post, Query } from "@nestjs/common";
+import { Throttle } from "@nestjs/throttler";
+import { CurrentUser } from "../common/decorators/current-user.decorator";
+import { ExpertAccessService } from "../oem-votes/expert-access.service";
+import { createOemSuggestionSchema } from "./oem-suggestions.dto";
+import { OemSuggestionsService } from "./oem-suggestions.service";
+
+@Controller("oem-suggestions")
+export class OemSuggestionsController {
+  constructor(
+    private readonly oemSuggestionsService: OemSuggestionsService,
+    private readonly expertAccess: ExpertAccessService,
+  ) {}
+
+  // Spam koruması: dakikada en fazla 10 öneri.
+  @Post()
+  @Throttle({ default: { limit: 10, ttl: 60_000 } })
+  async create(@CurrentUser("id") userId: string, @Body() body: unknown) {
+    await this.expertAccess.assert(userId);
+    const parsed = createOemSuggestionSchema.safeParse(body);
+    if (!parsed.success) {
+      throw new BadRequestException(parsed.error.issues[0]?.message ?? "Geçersiz öneri");
+    }
+    return this.oemSuggestionsService.create(userId, parsed.data);
+  }
+
+  @Get()
+  async list(@CurrentUser("id") userId: string, @Query("code") code: string) {
+    const oemCode = (code ?? "").trim();
+    if (oemCode.length < 2 || oemCode.length > 100) {
+      throw new BadRequestException("OEM kodu geçersiz");
+    }
+    return { suggestions: await this.oemSuggestionsService.list(userId, oemCode) };
+  }
+}

apps/api/src/oem-suggestions/oem-suggestions.dto.ts

@@ -0,0 +1,13 @@
+import { z } from "zod";
+
+export const createOemSuggestionSchema = z.object({
+  oemCode: z.string().trim().min(2, "OEM kodu geçersiz").max(100, "OEM kodu çok uzun"),
+  brand: z.string().trim().min(2, "Marka en az 2 karakter olmalı").max(80, "Marka çok uzun"),
+  suggestedCode: z
+    .string()
+    .trim()
+    .min(2, "Parça kodu en az 2 karakter olmalı")
+    .max(100, "Parça kodu çok uzun")
+    .refine((value) => /[a-zA-Z0-9]{2,}/.test(value), "Parça kodu geçersiz"),
+});
+export type CreateOemSuggestionInput = z.infer<typeof createOemSuggestionSchema>;

apps/api/src/oem-suggestions/oem-suggestions.logic.spec.ts

@@ -0,0 +1,45 @@
+import { describe, expect, it } from "vitest";
+import { aggregateSuggestions, normalizeSuggestedCode } from "./oem-suggestions.logic";
+
+describe("normalizeSuggestedCode", () => {
+  it("boşluk/tire söker, büyütür", () => {
+    expect(normalizeSuggestedCode("1j0 973-702")).toBe("1J0973702");
+    expect(normalizeSuggestedCode("8V0 615 423 E")).toBe("8V0615423E");
+  });
+});
+
+describe("aggregateSuggestions", () => {
+  const row = (userId: string, brand: string, code: string) => ({
+    userId,
+    brand,
+    suggestedCode: code,
+    suggestedCodeNorm: normalizeSuggestedCode(code),
+  });
+
+  it("aynı marka+normalize kodu tek satırda toplar, çok önerilen üste çıkar", () => {
+    const rows = [
+      row("u1", "Bosch", "0 986 478 123"),
+      row("u2", "bosch", "0986478123"),
+      row("u3", "TRW", "DF4823"),
+    ];
+    const out = aggregateSuggestions(rows, "u3");
+    expect(out).toHaveLength(2);
+    expect(out[0]).toMatchObject({ brand: "Bosch", code: "0 986 478 123", count: 2, mine: false });
+    expect(out[1]).toMatchObject({ brand: "TRW", count: 1, mine: true });
+  });
+
+  it("görünen yazım ilk gönderenin yazımıdır", () => {
+    const out = aggregateSuggestions(
+      [row("u1", "VALEO", "PHC123"), row("u2", "Valeo", "phc-123")],
+      "x",
+    );
+    expect(out[0].brand).toBe("VALEO");
+    expect(out[0].code).toBe("PHC123");
+    expect(out[0].count).toBe(2);
+  });
+
+  it("farklı marka aynı kod ayrı satırdır", () => {
+    const out = aggregateSuggestions([row("u1", "Bosch", "X1"), row("u2", "TRW", "X1")], "u1");
+    expect(out).toHaveLength(2);
+  });
+});

apps/api/src/oem-suggestions/oem-suggestions.logic.ts

@@ -0,0 +1,45 @@
+// Kod normalizasyonu: gruplama ve kullanıcı-başına dedup anahtarı. Görselde
+// kullanıcının yazdığı hâl korunur ("1J0 973 702" ↔ "1j0973702" aynı öneri).
+export function normalizeSuggestedCode(code: string): string {
+  return code.toUpperCase().replace(/[^A-Z0-9]/g, "");
+}
+
+export interface SuggestionRow {
+  userId: string;
+  brand: string;
+  suggestedCode: string;
+  suggestedCodeNorm: string;
+}
+
+export interface AggregatedSuggestion {
+  brand: string;
+  code: string;
+  count: number;
+  mine: boolean;
+}
+
+// Aynı (marka, normalize kod) önerisini tek satırda toplar: en çok önerilen
+// üstte, eşitlikte ilk gönderilen önde (rows createdAt sıralı gelir). Görünen
+// marka/kod ilk gönderenin yazımıdır.
+export function aggregateSuggestions(
+  rows: SuggestionRow[],
+  userId: string,
+): AggregatedSuggestion[] {
+  const groups = new Map<string, AggregatedSuggestion>();
+  for (const row of rows) {
+    const key = `${row.brand.trim().toLocaleLowerCase("tr-TR")}|${row.suggestedCodeNorm}`;
+    const existing = groups.get(key);
+    if (existing) {
+      existing.count += 1;
+      existing.mine ||= row.userId === userId;
+    } else {
+      groups.set(key, {
+        brand: row.brand.trim(),
+        code: row.suggestedCode.trim(),
+        count: 1,
+        mine: row.userId === userId,
+      });
+    }
+  }
+  return [...groups.values()].sort((a, b) => b.count - a.count);
+}

apps/api/src/oem-suggestions/oem-suggestions.module.ts

@@ -0,0 +1,12 @@
+import { Module } from "@nestjs/common";
+import { OemVotesModule } from "../oem-votes/oem-votes.module";
+import { OemSuggestionsController } from "./oem-suggestions.controller";
+import { OemSuggestionsService } from "./oem-suggestions.service";
+
+@Module({
+  imports: [OemVotesModule],
+  controllers: [OemSuggestionsController],
+  providers: [OemSuggestionsService],
+  exports: [OemSuggestionsService],
+})
+export class OemSuggestionsModule {}

apps/api/src/oem-suggestions/oem-suggestions.service.ts

@@ -0,0 +1,60 @@
+import { Inject, Injectable } from "@nestjs/common";
+import { and, asc, eq } from "drizzle-orm";
+import { DATABASE, type Database } from "../database/database.provider";
+import { oemSuggestions } from "../database/schema/core";
+import {
+  type AggregatedSuggestion,
+  aggregateSuggestions,
+  normalizeSuggestedCode,
+} from "./oem-suggestions.logic";
+
+export interface CreateSuggestionResult {
+  created: boolean; // false = bu kullanıcı aynı öneriyi zaten göndermiş
+  suggestions: AggregatedSuggestion[];
+}
+
+@Injectable()
+export class OemSuggestionsService {
+  constructor(@Inject(DATABASE) private db: Database) {}
+
+  async create(
+    userId: string,
+    input: { oemCode: string; brand: string; suggestedCode: string },
+  ): Promise<CreateSuggestionResult> {
+    const oemCode = input.oemCode.trim();
+    // Aynı kullanıcının aynı (kod, normalize öneri) tekrarı sessizce yutulur —
+    // sayaç şişirme yok; farklı kullanıcılar aynı öneriyi destekleyerek büyütür.
+    const inserted = await this.db
+      .insert(oemSuggestions)
+      .values({
+        userId,
+        oemCode,
+        brand: input.brand.trim(),
+        suggestedCode: input.suggestedCode.trim(),
+        suggestedCodeNorm: normalizeSuggestedCode(input.suggestedCode),
+      })
+      .onConflictDoNothing()
+      .returning({ id: oemSuggestions.id });
+
+    return {
+      created: inserted.length > 0,
+      suggestions: await this.list(userId, oemCode),
+    };
+  }
+
+  async list(userId: string, oemCode: string): Promise<AggregatedSuggestion[]> {
+    const rows = await this.db
+      .select({
+        userId: oemSuggestions.userId,
+        brand: oemSuggestions.brand,
+        suggestedCode: oemSuggestions.suggestedCode,
+        suggestedCodeNorm: oemSuggestions.suggestedCodeNorm,
+      })
+      .from(oemSuggestions)
+      .where(and(eq(oemSuggestions.oemCode, oemCode.trim()), eq(oemSuggestions.status, "active")))
+      .orderBy(asc(oemSuggestions.createdAt))
+      .limit(500);
+
+    return aggregateSuggestions(rows, userId);
+  }
+}

apps/api/src/oem-votes/expert-access.service.ts

@@ -0,0 +1,49 @@
+import { ForbiddenException, Inject, Injectable } from "@nestjs/common";
+import { and, countDistinct, eq } from "drizzle-orm";
+import { DATABASE, type Database } from "../database/database.provider";
+import { oemCodeCopies, queryLogs } from "../database/schema/core";
+import { PostHogService } from "../posthog/posthog.service";
+import { meetsExpertCriteria } from "./oem-votes.logic";
+
+// Parça Uzmanları programının ana şalteri (PostHog, local-eval). Kapatınca
+// program herkesten gizlenir; yüzdeli rollout gerekirse oradan daraltılır.
+export const EXPERT_PROGRAM_FLAG = "oem-expert-program";
+
+@Injectable()
+export class ExpertAccessService {
+  constructor(
+    @Inject(DATABASE) private db: Database,
+    private readonly posthog: PostHogService,
+  ) {}
+
+  // Erişim = flag AÇIK VE kullanım kriteri: en az 5 FARKLI başarılı VIN
+  // decode + en az 5 FARKLI OEM kodu kopyası (kayıtlı, kataloğu gerçekten
+  // kullanan üyeler — eşikler oem-votes.logic.ts'te). Flag local-eval
+  // edilemezse fail-open — kitleyi kriter zaten daraltır, PostHog kesintisi
+  // programı söndürmesin.
+  async check(userId: string): Promise<{ enabled: boolean }> {
+    const flagOn = await this.posthog.isEnabled(EXPERT_PROGRAM_FLAG, userId, true);
+    if (!flagOn) return { enabled: false };
+
+    const [vinRows, copyRows] = await Promise.all([
+      this.db
+        .select({ n: countDistinct(queryLogs.vin) })
+        .from(queryLogs)
+        .where(and(eq(queryLogs.userId, userId), eq(queryLogs.success, true))),
+      this.db
+        .select({ n: countDistinct(oemCodeCopies.oemCode) })
+        .from(oemCodeCopies)
+        .where(eq(oemCodeCopies.userId, userId)),
+    ]);
+
+    return { enabled: meetsExpertCriteria(vinRows[0]?.n ?? 0, copyRows[0]?.n ?? 0) };
+  }
+
+  // Yazma uçları (oy, öneri) UI gizlense bile doğrudan istekle delinemesin.
+  async assert(userId: string): Promise<void> {
+    const { enabled } = await this.check(userId);
+    if (!enabled) {
+      throw new ForbiddenException("Parça Uzmanları programı hesabınızda henüz aktif değil");
+    }
+  }
+}

apps/api/src/oem-votes/expert-period.spec.ts

@@ -0,0 +1,37 @@
+import { describe, expect, it } from "vitest";
+import { EXPERT_REWARD_LADDER, previousTrMonthWindow, trMonthStart } from "./expert-period";
+
+describe("trMonthStart", () => {
+  it("ay ortasında TR-ayının başını UTC olarak verir (TR 00:00 = UTC 21:00 önceki gün)", () => {
+    const now = new Date("2026-06-15T10:00:00Z");
+    expect(trMonthStart(now).toISOString()).toBe("2026-05-31T21:00:00.000Z");
+  });
+
+  it("UTC gece TR'de yeni aya geçmişse TR gününü baz alır", () => {
+    // UTC 30 Haziran 22:30 = TR 1 Temmuz 01:30 → içinde bulunulan TR-ayı Temmuz
+    const now = new Date("2026-06-30T22:30:00Z");
+    expect(trMonthStart(now).toISOString()).toBe("2026-06-30T21:00:00.000Z");
+    expect(trMonthStart(now, 1).toISOString()).toBe("2026-05-31T21:00:00.000Z");
+  });
+
+  it("yıl devrini doğru çözer (TR ocak → geriye aralık)", () => {
+    const now = new Date("2026-01-10T12:00:00Z");
+    expect(trMonthStart(now, 1).toISOString()).toBe("2025-11-30T21:00:00.000Z");
+  });
+});
+
+describe("previousTrMonthWindow", () => {
+  it("cron anında (TR 1'i 00:00) biten ayı kapsar", () => {
+    // TR 1 Temmuz 00:00 = UTC 30 Haziran 21:00
+    const cronMoment = new Date("2026-06-30T21:00:00Z");
+    const { start, end } = previousTrMonthWindow(cronMoment);
+    expect(start.toISOString()).toBe("2026-05-31T21:00:00.000Z"); // TR 1 Haziran 00:00
+    expect(end.toISOString()).toBe("2026-06-30T21:00:00.000Z"); // TR 1 Temmuz 00:00
+  });
+});
+
+describe("EXPERT_REWARD_LADDER", () => {
+  it("1. → 30 gün, 2. → 15 gün, 3. → 7 gün", () => {
+    expect(EXPERT_REWARD_LADDER.map((r) => r.days)).toEqual([30, 15, 7]);
+  });
+});

apps/api/src/oem-votes/expert-period.ts

@@ -0,0 +1,23 @@
+// Parça Uzmanları aylık sezon takvimi. Sınırlar Türkiye saatine göredir
+// (Europe/Istanbul, 2016'dan beri sabit UTC+3 — DST yok); sıralama her ayın
+// 1'i 00:00 TR'de sıfırlanır, biten ayın ilk 3'üne üyelik uzatması verilir.
+const TR_OFFSET_MS = 3 * 60 * 60 * 1000;
+
+// Ödül merdiveni: 1. → 1 ay (30 gün), 2. → 15 gün, 3. → 7 gün üyelik.
+export const EXPERT_REWARD_LADDER = [
+  { rank: 1, days: 30 },
+  { rank: 2, days: 15 },
+  { rank: 3, days: 7 },
+] as const;
+
+// `monthsBack` ay geriden TR-ayının başlangıcını UTC Date olarak döndürür
+// (0 = içinde bulunulan ay). Date.UTC ay taşmalarını (ocak-1 → aralık) çözer.
+export function trMonthStart(now: Date, monthsBack = 0): Date {
+  const tr = new Date(now.getTime() + TR_OFFSET_MS);
+  return new Date(Date.UTC(tr.getUTCFullYear(), tr.getUTCMonth() - monthsBack, 1) - TR_OFFSET_MS);
+}
+
+// Biten sezonun penceresi: [önceki TR-ay başı, bu TR-ay başı).
+export function previousTrMonthWindow(now: Date): { start: Date; end: Date } {
+  return { start: trMonthStart(now, 1), end: trMonthStart(now, 0) };
+}

apps/api/src/oem-votes/oem-votes.controller.ts

@@ -0,0 +1,47 @@
+import { BadRequestException, Body, Controller, Get, Post } from "@nestjs/common";
+import { Throttle } from "@nestjs/throttler";
+import { CurrentUser } from "../common/decorators/current-user.decorator";
+import { ExpertAccessService } from "./expert-access.service";
+import { castOemVoteSchema, lookupOemVotesSchema } from "./oem-votes.dto";
+import { OemVotesService } from "./oem-votes.service";
+
+@Controller("oem-votes")
+export class OemVotesController {
+  constructor(
+    private readonly oemVotesService: OemVotesService,
+    private readonly expertAccess: ExpertAccessService,
+  ) {}
+
+  // Program kapısı: flag + kullanım kriteri (web açılışta bir kez sorar).
+  @Get("access")
+  async access(@CurrentUser("id") userId: string) {
+    return this.expertAccess.check(userId);
+  }
+
+  // Puan çiftliğine karşı insan-hızı sınırı: dakikada en fazla 30 oy.
+  @Post()
+  @Throttle({ default: { limit: 30, ttl: 60_000 } })
+  async cast(@CurrentUser("id") userId: string, @Body() body: unknown) {
+    await this.expertAccess.assert(userId);
+    const parsed = castOemVoteSchema.safeParse(body);
+    if (!parsed.success) {
+      throw new BadRequestException(parsed.error.issues[0]?.message ?? "Geçersiz oy verisi");
+    }
+    return this.oemVotesService.castVote(userId, parsed.data);
+  }
+
+  // Kod listesi URL sınırına sığmayacak kadar uzayabildiği için POST (bkz. /p/matched).
+  @Post("lookup")
+  async lookup(@CurrentUser("id") userId: string, @Body() body: unknown) {
+    const parsed = lookupOemVotesSchema.safeParse(body);
+    if (!parsed.success) {
+      throw new BadRequestException(parsed.error.issues[0]?.message ?? "Geçersiz kod listesi");
+    }
+    return { votes: await this.oemVotesService.lookup(userId, parsed.data.codes) };
+  }
+
+  @Get("leaderboard")
+  async leaderboard(@CurrentUser("id") userId: string) {
+    return this.oemVotesService.leaderboard(userId);
+  }
+}

apps/api/src/oem-votes/oem-votes.dto.ts

@@ -0,0 +1,17 @@
+import { z } from "zod";
+
+export const castOemVoteSchema = z.object({
+  oemCode: z.string().trim().min(2, "OEM kodu geçersiz").max(100, "OEM kodu çok uzun"),
+  vote: z.enum(["compatible", "incompatible"]),
+  // Analitik bağlamı — katalog rotaları catalog_vehicles id'si yollayabilir,
+  // UUID olmayan değerler serviste sessizce düşürülür (oy yine kaydedilir).
+  partId: z.string().max(100).optional(),
+  vehicleId: z.string().max(100).optional(),
+  categoryId: z.string().max(100).optional(),
+});
+export type CastOemVoteInput = z.infer<typeof castOemVoteSchema>;
+
+export const lookupOemVotesSchema = z.object({
+  codes: z.array(z.string().trim().min(1).max(100)).min(1).max(400),
+});
+export type LookupOemVotesInput = z.infer<typeof lookupOemVotesSchema>;

apps/api/src/oem-votes/oem-votes.logic.spec.ts

@@ -0,0 +1,79 @@
+import { describe, expect, it } from "vitest";
+import { computeVoteAward, maskExpertName, meetsExpertCriteria } from "./oem-votes.logic";
+
+describe("computeVoteAward", () => {
+  it("ilk oy: kimse oylamamışsa 3 puan (1 oy + 2 doğru)", () => {
+    expect(computeVoteAward({ compatible: 0, incompatible: 0 }, "compatible")).toEqual({
+      points: 3,
+      correct: true,
+    });
+    expect(computeVoteAward({ compatible: 0, incompatible: 0 }, "incompatible")).toEqual({
+      points: 3,
+      correct: true,
+    });
+  });
+
+  it("1 kişi uyumlu demişken uyumsuz diyen 1 puan, uyumlu diyen 3 puan alır", () => {
+    const prior = { compatible: 1, incompatible: 0 };
+    expect(computeVoteAward(prior, "incompatible")).toEqual({ points: 1, correct: false });
+    expect(computeVoteAward(prior, "compatible")).toEqual({ points: 3, correct: true });
+  });
+
+  it("beraberliği bozan oy çoğunluğu kendi tarafına çevirdiği için 3 puan alır", () => {
+    expect(computeVoteAward({ compatible: 1, incompatible: 1 }, "compatible")).toEqual({
+      points: 3,
+      correct: true,
+    });
+  });
+
+  it("açık çoğunluğa karşı oy yalnız taban puanı alır", () => {
+    expect(computeVoteAward({ compatible: 5, incompatible: 1 }, "incompatible")).toEqual({
+      points: 1,
+      correct: false,
+    });
+    expect(computeVoteAward({ compatible: 5, incompatible: 1 }, "compatible")).toEqual({
+      points: 3,
+      correct: true,
+    });
+  });
+
+  it("oyumla beraberlik oluşuyorsa çoğunluk sağlanmaz, 1 puan", () => {
+    // 2-1 iken uyumsuz oyu → 2-2: kesin çoğunluk yok.
+    expect(computeVoteAward({ compatible: 2, incompatible: 1 }, "incompatible")).toEqual({
+      points: 1,
+      correct: false,
+    });
+  });
+});
+
+describe("maskExpertName", () => {
+  it("ad ve soyadın yalnız ilk harfini açık bırakır", () => {
+    expect(maskExpertName("Semih Yılmaz")).toBe("S*** Y***");
+  });
+
+  it("ara adları düşürür, soyad olarak son kelimeyi alır", () => {
+    expect(maskExpertName("Ali Rıza Demir")).toBe("A*** D***");
+  });
+
+  it("tek kelimelik adı maskeler", () => {
+    expect(maskExpertName("Semih")).toBe("S***");
+  });
+
+  it("Türkçe karakterleri doğru büyütür", () => {
+    expect(maskExpertName("ismail çelik")).toBe("İ*** Ç***");
+  });
+
+  it("boş ada güvenli düşer", () => {
+    expect(maskExpertName("   ")).toBe("Üye");
+  });
+});
+
+describe("meetsExpertCriteria", () => {
+  it("en az 5 farklı VIN VE en az 5 farklı OEM kopyası ister", () => {
+    expect(meetsExpertCriteria(5, 5)).toBe(true);
+    expect(meetsExpertCriteria(12, 7)).toBe(true);
+    expect(meetsExpertCriteria(4, 5)).toBe(false);
+    expect(meetsExpertCriteria(5, 4)).toBe(false);
+    expect(meetsExpertCriteria(0, 0)).toBe(false);
+  });
+});

apps/api/src/oem-votes/oem-votes.logic.ts

@@ -0,0 +1,46 @@
+export type OemVoteChoice = "compatible" | "incompatible";
+
+export interface VoteCounts {
+  compatible: number;
+  incompatible: number;
+}
+
+export interface VoteAward {
+  points: number;
+  correct: boolean;
+}
+
+export const VOTE_BASE_POINTS = 1;
+export const VOTE_MAJORITY_BONUS = 2;
+
+// "Doğru oy" = kendi oyu da sayıldığında kesin çoğunlukla aynı tarafta olmak.
+// İlk oy (0-0 → 1-0) ve beraberliği bozan oy çoğunluğu kendi tarafına
+// çevirdiği için doğrudur (3 puan); mevcut çoğunluğa karşı oy yalnız taban
+// puanı alır (1). Ödül oy anında kesinleşir, çoğunluk sonradan dönse bile
+// geriye dönük düzeltilmez.
+export function computeVoteAward(prior: VoteCounts, vote: OemVoteChoice): VoteAward {
+  const mine = (vote === "compatible" ? prior.compatible : prior.incompatible) + 1;
+  const other = vote === "compatible" ? prior.incompatible : prior.compatible;
+  const correct = mine > other;
+  return { points: VOTE_BASE_POINTS + (correct ? VOTE_MAJORITY_BONUS : 0), correct };
+}
+
+// Program kitle kriteri: kataloğu gerçekten kullanan kayıtlı üyeler —
+// en az 5 FARKLI başarılı VIN decode VE en az 5 FARKLI OEM kodu kopyası.
+export const MIN_DISTINCT_VINS = 5;
+export const MIN_DISTINCT_OEM_COPIES = 5;
+
+export function meetsExpertCriteria(distinctVins: number, distinctOemCopies: number): boolean {
+  return distinctVins >= MIN_DISTINCT_VINS && distinctOemCopies >= MIN_DISTINCT_OEM_COPIES;
+}
+
+// Liderlik listesi adları KVKK-dostu: yalnız ad ve soyadın ilk harfi açık
+// ("Semih Yılmaz" → "S*** Y***"). Ara adlar tamamen düşer; tek kelimelik
+// adlarda o kelimenin ilk harfi kalır.
+export function maskExpertName(fullName: string): string {
+  const words = fullName.trim().split(/\s+/).filter(Boolean);
+  if (words.length === 0) return "Üye";
+  const maskWord = (w: string) => `${w.charAt(0).toLocaleUpperCase("tr-TR")}***`;
+  if (words.length === 1) return maskWord(words[0]);
+  return `${maskWord(words[0])} ${maskWord(words[words.length - 1])}`;
+}

apps/api/src/oem-votes/oem-votes.module.ts

@@ -0,0 +1,11 @@
+import { Module } from "@nestjs/common";
+import { ExpertAccessService } from "./expert-access.service";
+import { OemVotesController } from "./oem-votes.controller";
+import { OemVotesService } from "./oem-votes.service";
+
+@Module({
+  controllers: [OemVotesController],
+  providers: [OemVotesService, ExpertAccessService],
+  exports: [OemVotesService, ExpertAccessService],
+})
+export class OemVotesModule {}

apps/api/src/oem-votes/oem-votes.service.ts

@@ -0,0 +1,209 @@
+import { Inject, Injectable } from "@nestjs/common";
+import { and, count, desc, eq, gte, inArray, sql } from "drizzle-orm";
+import { DATABASE, type Database } from "../database/database.provider";
+import { oemVotePoints, oemVotes, users } from "../database/schema/core";
+import { trMonthStart } from "./expert-period";
+import {
+  type OemVoteChoice,
+  type VoteCounts,
+  computeVoteAward,
+  maskExpertName,
+} from "./oem-votes.logic";
+
+type Tx = Parameters<Parameters<Database["transaction"]>[0]>[0];
+
+const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
+const uuidOrNull = (value?: string) => (value && UUID_RE.test(value) ? value : null);
+
+export interface CastVoteResult {
+  oemCode: string;
+  myVote: OemVoteChoice;
+  counts: VoteCounts;
+  pointsAwarded: number;
+  correct: boolean | null;
+  isNew: boolean;
+}
+
+export interface OemVoteSummary extends VoteCounts {
+  myVote: OemVoteChoice | null;
+}
+
+export interface LeaderboardEntry {
+  rank: number;
+  name: string;
+  points: number;
+  votes: number;
+  isMe: boolean;
+}
+
+@Injectable()
+export class OemVotesService {
+  constructor(@Inject(DATABASE) private db: Database) {}
+
+  async castVote(
+    userId: string,
+    input: {
+      oemCode: string;
+      vote: OemVoteChoice;
+      partId?: string;
+      vehicleId?: string;
+      categoryId?: string;
+    },
+  ): Promise<CastVoteResult> {
+    const oemCode = input.oemCode.trim();
+    const context = {
+      partId: uuidOrNull(input.partId),
+      vehicleId: uuidOrNull(input.vehicleId),
+      categoryId: uuidOrNull(input.categoryId),
+    };
+
+    return this.db.transaction(async (tx) => {
+      // Aynı kod üzerindeki eşzamanlı oyları sıraya sok: ilk-oy bonusu ve
+      // çoğunluk hesabı yarışsız, deterministik kalır. Kod bazlı kilit —
+      // farklı kodlar birbirini bekletmez, tx sonunda otomatik bırakılır.
+      await tx.execute(sql`SELECT pg_advisory_xact_lock(hashtext(${`oem-vote:${oemCode}`}))`);
+
+      const [existing] = await tx
+        .select({ id: oemVotes.id, vote: oemVotes.vote })
+        .from(oemVotes)
+        .where(and(eq(oemVotes.userId, userId), eq(oemVotes.oemCode, oemCode)))
+        .limit(1);
+
+      if (existing) {
+        // Fikir değişikliği oyu günceller ama puan üretmez (puan çiftliği yok).
+        if (existing.vote !== input.vote) {
+          await tx
+            .update(oemVotes)
+            .set({ vote: input.vote, ...context, updatedAt: new Date() })
+            .where(eq(oemVotes.id, existing.id));
+        }
+        return {
+          oemCode,
+          myVote: input.vote,
+          counts: await this.countVotes(tx, oemCode),
+          pointsAwarded: 0,
+          correct: null,
+          isNew: false,
+        };
+      }
+
+      const prior = await this.countVotes(tx, oemCode);
+      const award = computeVoteAward(prior, input.vote);
+
+      const [inserted] = await tx
+        .insert(oemVotes)
+        .values({ userId, oemCode, vote: input.vote, ...context })
+        .returning({ id: oemVotes.id });
+
+      await tx.insert(oemVotePoints).values({
+        userId,
+        voteId: inserted.id,
+        oemCode,
+        points: award.points,
+        correct: award.correct,
+      });
+
+      return {
+        oemCode,
+        myVote: input.vote,
+        counts: {
+          compatible: prior.compatible + (input.vote === "compatible" ? 1 : 0),
+          incompatible: prior.incompatible + (input.vote === "incompatible" ? 1 : 0),
+        },
+        pointsAwarded: award.points,
+        correct: award.correct,
+        isNew: true,
+      };
+    });
+  }
+
+  // Parça listesi açılırken görünen kodların oy özetleri — tek toplu sorgu.
+  async lookup(userId: string, codes: string[]): Promise<Record<string, OemVoteSummary>> {
+    const unique = [...new Set(codes.map((c) => c.trim()).filter(Boolean))];
+    if (unique.length === 0) return {};
+
+    const [tallies, mine] = await Promise.all([
+      this.db
+        .select({ oemCode: oemVotes.oemCode, vote: oemVotes.vote, total: count() })
+        .from(oemVotes)
+        .where(inArray(oemVotes.oemCode, unique))
+        .groupBy(oemVotes.oemCode, oemVotes.vote),
+      this.db
+        .select({ oemCode: oemVotes.oemCode, vote: oemVotes.vote })
+        .from(oemVotes)
+        .where(and(eq(oemVotes.userId, userId), inArray(oemVotes.oemCode, unique))),
+    ]);
+
+    const result: Record<string, OemVoteSummary> = {};
+    const entry = (code: string) => {
+      result[code] ??= { compatible: 0, incompatible: 0, myVote: null };
+      return result[code];
+    };
+    for (const row of tallies) {
+      const summary = entry(row.oemCode);
+      if (row.vote === "compatible") summary.compatible = row.total;
+      else summary.incompatible = row.total;
+    }
+    for (const row of mine) {
+      entry(row.oemCode).myVote = row.vote as OemVoteChoice;
+    }
+    return result;
+  }
+
+  // Parça Uzmanları: içinde bulunulan TR-ayının (sezonun) sıralaması — her
+  // ayın 1'i 00:00 TR'de sıfırlanır, biten ayın ilk 3'üne expert-rewards
+  // cron'u üyelik uzatması verir. Puana göre herkes, adlar maskeli
+  // ("S*** Y***"); yanıt userId sızdırmaz, istek sahibi kendi satırını isMe
+  // ile bulur. Sıralama ödül job'ıyla birebir aynı: puan desc, eşitlikte
+  // puana daha erken ulaşan önde.
+  async leaderboard(userId: string): Promise<{
+    entries: LeaderboardEntry[];
+    me: { rank: number | null; points: number; votes: number };
+    periodStart: string;
+  }> {
+    const periodStart = trMonthStart(new Date());
+    const totalPoints = sql<number>`sum(${oemVotePoints.points})::int`;
+    const rows = await this.db
+      .select({
+        userId: oemVotePoints.userId,
+        name: users.name,
+        points: totalPoints,
+        votes: count(),
+      })
+      .from(oemVotePoints)
+      .innerJoin(users, eq(users.id, oemVotePoints.userId))
+      .where(gte(oemVotePoints.createdAt, periodStart))
+      .groupBy(oemVotePoints.userId, users.name)
+      .orderBy(desc(totalPoints), sql`min(${oemVotePoints.createdAt}) asc`)
+      .limit(500);
+
+    const entries = rows.map((row, i) => ({
+      rank: i + 1,
+      name: maskExpertName(row.name),
+      points: row.points,
+      votes: row.votes,
+      isMe: row.userId === userId,
+    }));
+    const my = entries.find((e) => e.isMe);
+    return {
+      entries,
+      me: { rank: my?.rank ?? null, points: my?.points ?? 0, votes: my?.votes ?? 0 },
+      periodStart: periodStart.toISOString(),
+    };
+  }
+
+  private async countVotes(tx: Tx, oemCode: string): Promise<VoteCounts> {
+    const rows = await tx
+      .select({ vote: oemVotes.vote, total: count() })
+      .from(oemVotes)
+      .where(eq(oemVotes.oemCode, oemCode))
+      .groupBy(oemVotes.vote);
+
+    const counts: VoteCounts = { compatible: 0, incompatible: 0 };
+    for (const row of rows) {
+      if (row.vote === "compatible") counts.compatible = row.total;
+      else counts.incompatible = row.total;
+    }
+    return counts;
+  }
+}

apps/api/src/worker.ts

@@ -9,6 +9,7 @@ import OpenAI from "openai";
 import postgres from "postgres";
 import { QUEUE_NAMES, getBullConnection, getBullTelemetry } from "./jobs/bull.config";
 import { processEmexScrape } from "./jobs/processors/emex-scrape.processor";
+import { processExpertRewards } from "./jobs/processors/expert-rewards.processor";
 import { processLifecycleEmails } from "./jobs/processors/lifecycle-email.processor";
 import { processQueryCleanup } from "./jobs/processors/query-cleanup.processor";
 import { processSubscriptionExpiry } from "./jobs/processors/subscription-expiry.processor";
@@ -159,6 +160,32 @@ lifecycleEmailWorker.on("failed", (job, err) => {
 
 workers.push(lifecycleEmailWorker);
 
+// Expert Rewards Worker (monthly Parça Uzmanları top-3 subscription prizes)
+const expertRewardsWorker = new Worker(
+  QUEUE_NAMES.EXPERT_REWARDS,
+  async (job) => {
+    return processExpertRewards(job, db);
+  },
+  {
+    connection,
+    concurrency: 1,
+    ...(telemetry ? { telemetry } : {}),
+  },
+);
+
+expertRewardsWorker.on("completed", (job) => {
+  console.log(`[worker] expert-rewards job ${job.id} completed`);
+});
+
+expertRewardsWorker.on("failed", (job, err) => {
+  console.error(`[worker] expert-rewards job ${job?.id} failed: ${err.message}`);
+  Sentry.captureException(err, {
+    tags: { queue: QUEUE_NAMES.EXPERT_REWARDS, jobId: job?.id },
+  });
+});
+
+workers.push(expertRewardsWorker);
+
 // Translation Worker (async LLM translation for new EMEX/PCAT terms)
 const openrouterApiKey = process.env.OPENROUTER_API_KEY;
 if (openrouterApiKey) {

apps/web/src/components/catalog/__tests__/oem-suggestions-section.test.tsx

@@ -0,0 +1,102 @@
+import { cleanup, fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+const captureMock = vi.fn();
+const toastSuccessMock = vi.fn();
+
+vi.mock("@/lib/posthog", () => ({
+  capture: (...args: unknown[]) => captureMock(...args),
+}));
+
+vi.mock("@/lib/api-client", () => ({
+  api: {
+    post: vi.fn().mockResolvedValue({}),
+    get: vi.fn().mockResolvedValue({}),
+  },
+}));
+
+vi.mock("@/lib/toast", () => ({
+  toast: {
+    success: (...args: unknown[]) => toastSuccessMock(...args),
+    error: vi.fn(),
+    info: vi.fn(),
+    warning: vi.fn(),
+  },
+}));
+
+vi.mock("@tanstack/react-router", () => ({
+  Link: ({
+    children,
+    to,
+    params,
+  }: { children: React.ReactNode; to: string; params?: { code: string } }) => (
+    <a href={params ? to.replace("$code", params.code) : to}>{children}</a>
+  ),
+}));
+
+import { api } from "@/lib/api-client";
+import { OemSuggestionsSection } from "../oem-suggestions-section";
+
+beforeEach(() => {
+  captureMock.mockClear();
+  toastSuccessMock.mockClear();
+  vi.mocked(api.get).mockReset().mockResolvedValue({ suggestions: [] });
+  vi.mocked(api.post).mockReset().mockResolvedValue({});
+});
+
+afterEach(() => {
+  cleanup();
+});
+
+describe("OemSuggestionsSection", () => {
+  it("lists aggregated suggestions with supporter counts", async () => {
+    vi.mocked(api.get).mockResolvedValue({
+      suggestions: [
+        { brand: "Bosch", code: "0 986 478 123", count: 3, mine: true },
+        { brand: "TRW", code: "DF4823", count: 1, mine: false },
+      ],
+    });
+
+    render(<OemSuggestionsSection oemCode="8V0615423E" />);
+
+    await waitFor(() => {
+      expect(api.get).toHaveBeenCalledWith("/oem-suggestions?code=8V0615423E");
+      expect(screen.getByText("Bosch")).toBeInTheDocument();
+    });
+    expect(screen.getByRole("link", { name: "0 986 478 123" })).toBeInTheDocument();
+    expect(screen.getByText("sizin öneriniz")).toBeInTheDocument();
+  });
+
+  it("submits a brand + code suggestion and refreshes the list", async () => {
+    vi.mocked(api.post).mockResolvedValue({
+      created: true,
+      suggestions: [{ brand: "Valeo", code: "PHC123", count: 1, mine: true }],
+    });
+
+    render(<OemSuggestionsSection oemCode="X1" />);
+    await waitFor(() => expect(api.get).toHaveBeenCalled());
+
+    fireEvent.click(screen.getByRole("button", { name: /Muadil öner/ }));
+    fireEvent.change(screen.getByPlaceholderText("Marka (ör. Bosch)"), {
+      target: { value: "Valeo" },
+    });
+    fireEvent.change(screen.getByPlaceholderText("Parça kodu"), {
+      target: { value: "PHC123" },
+    });
+    fireEvent.click(screen.getByRole("button", { name: "Gönder" }));
+
+    await waitFor(() => {
+      expect(api.post).toHaveBeenCalledWith("/oem-suggestions", {
+        oemCode: "X1",
+        brand: "Valeo",
+        suggestedCode: "PHC123",
+      });
+      expect(toastSuccessMock).toHaveBeenCalled();
+      expect(captureMock).toHaveBeenCalledWith(
+        "oem_suggestion_submitted",
+        expect.objectContaining({ oem_code: "X1", brand: "Valeo", created: true }),
+      );
+      expect(screen.getByText("Valeo")).toBeInTheDocument();
+    });
+  });
+});

apps/web/src/components/catalog/__tests__/oem-vote-card.test.tsx

@@ -0,0 +1,105 @@
+import { cleanup, fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+const captureMock = vi.fn();
+const toastSuccessMock = vi.fn();
+
+vi.mock("@/lib/posthog", () => ({
+  capture: (...args: unknown[]) => captureMock(...args),
+}));
+
+vi.mock("@/lib/api-client", () => ({
+  api: {
+    post: vi.fn().mockResolvedValue({}),
+    get: vi.fn().mockResolvedValue({}),
+  },
+}));
+
+vi.mock("@/lib/toast", () => ({
+  toast: {
+    success: (...args: unknown[]) => toastSuccessMock(...args),
+    error: vi.fn(),
+    info: vi.fn(),
+    warning: vi.fn(),
+  },
+}));
+
+vi.mock("@tanstack/react-router", () => ({
+  Link: ({ children, to }: { children: React.ReactNode; to: string }) => (
+    <a href={to}>{children}</a>
+  ),
+}));
+
+import { api } from "@/lib/api-client";
+import { OemVoteCard } from "../oem-vote-card";
+
+beforeEach(() => {
+  captureMock.mockClear();
+  toastSuccessMock.mockClear();
+  vi.mocked(api.post).mockReset().mockResolvedValue({});
+});
+
+afterEach(() => {
+  cleanup();
+});
+
+describe("OemVoteCard", () => {
+  it("loads the summary, marks my vote and hides the tallies", async () => {
+    vi.mocked(api.post).mockResolvedValue({
+      votes: { "8V0615423E": { compatible: 4, incompatible: 1, myVote: "compatible" } },
+    });
+
+    render(
+      <OemVoteCard oemCode="8V0615423E" vehicleLabel="Audi A4 (2018)" partName="Fren balatası" />,
+    );
+
+    // bağlam satırı: neyle neyin uyumlu olduğu tek alanda
+    expect(screen.getByText("Audi A4 (2018) · Fren balatası")).toBeInTheDocument();
+
+    const upButton = screen.getByRole("button", { name: /Uyumlu/ });
+    const downButton = screen.getByRole("button", { name: /Uyumsuz/ });
+    await waitFor(() => {
+      expect(api.post).toHaveBeenCalledWith("/oem-votes/lookup", { codes: ["8V0615423E"] });
+      expect(upButton).toHaveAttribute("aria-pressed", "true");
+    });
+    // sayaçlar butonlarda görünmez (çoğunluk oyu yönlendirmesin)
+    expect(upButton.textContent).not.toContain("4");
+    expect(downButton.textContent).not.toContain("1");
+  });
+
+  it("casts a vote, updates the counts and reports the points", async () => {
+    const postMock = vi.mocked(api.post);
+    postMock.mockImplementation((path: string) => {
+      if (path === "/oem-votes") {
+        return Promise.resolve({
+          oemCode: "X1",
+          myVote: "incompatible",
+          counts: { compatible: 0, incompatible: 1 },
+          pointsAwarded: 3,
+          correct: true,
+          isNew: true,
+        });
+      }
+      return Promise.resolve({ votes: {} });
+    });
+
+    render(<OemVoteCard oemCode="X1" />);
+
+    const downButton = screen.getByRole("button", { name: /Uyumsuz/ });
+    await waitFor(() => expect(downButton).toBeEnabled());
+    fireEvent.click(downButton);
+
+    await waitFor(() => {
+      expect(postMock).toHaveBeenCalledWith(
+        "/oem-votes",
+        expect.objectContaining({ oemCode: "X1", vote: "incompatible" }),
+      );
+      expect(toastSuccessMock).toHaveBeenCalledWith("+3 puan kazandınız!", expect.anything());
+      expect(captureMock).toHaveBeenCalledWith(
+        "oem_vote_cast",
+        expect.objectContaining({ oem_code: "X1", vote: "incompatible", surface: "oem_detail" }),
+      );
+    });
+    expect(downButton).toHaveAttribute("aria-pressed", "true");
+  });
+});

apps/web/src/components/catalog/oem-suggestions-section.tsx

@@ -0,0 +1,158 @@
+import { api } from "@/lib/api-client";
+import { capture } from "@/lib/posthog";
+import { toast } from "@/lib/toast";
+import { Badge, Button, Input, Skeleton } from "@sase/ui";
+import { Link } from "@tanstack/react-router";
+import { Plus, Users } from "lucide-react";
+import { useEffect, useState } from "react";
+
+export interface AggregatedSuggestion {
+  brand: string;
+  code: string;
+  count: number;
+  mine: boolean;
+}
+
+// Topluluk muadil önerileri: P kataloğunda eşleşmesi olmayan (ya da eksik
+// kalan) OEM kodları için parça satıcılarından marka + kod toplar. Aynı
+// öneriyi veren kullanıcı sayısı rozetle gösterilir; önerilen kod kendi OEM
+// detay sayfasına linklenir.
+export function OemSuggestionsSection({ oemCode }: { oemCode: string }) {
+  const [suggestions, setSuggestions] = useState<AggregatedSuggestion[] | null>(null);
+  const [formOpen, setFormOpen] = useState(false);
+  const [brand, setBrand] = useState("");
+  const [code, setCode] = useState("");
+  const [submitting, setSubmitting] = useState(false);
+
+  useEffect(() => {
+    let cancelled = false;
+    setSuggestions(null);
+    api
+      .get<{ suggestions: AggregatedSuggestion[] }>(
+        `/oem-suggestions?code=${encodeURIComponent(oemCode)}`,
+      )
+      .then((res) => {
+        if (!cancelled) setSuggestions(res?.suggestions ?? []);
+      })
+      .catch(() => {
+        if (!cancelled) setSuggestions([]);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [oemCode]);
+
+  const submit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setSubmitting(true);
+    try {
+      const res = await api.post<{ created: boolean; suggestions: AggregatedSuggestion[] }>(
+        "/oem-suggestions",
+        { oemCode, brand, suggestedCode: code },
+      );
+      setSuggestions(res.suggestions);
+      if (res.created) {
+        toast.success("Öneriniz eklendi, teşekkürler!", {
+          description: "Aynı öneriyi veren satıcı arttıkça öneri güçlenir.",
+        });
+      } else {
+        toast.info("Bu öneriyi zaten eklemişsiniz.");
+      }
+      capture("oem_suggestion_submitted", {
+        oem_code: oemCode,
+        brand,
+        created: res.created,
+      });
+      setBrand("");
+      setCode("");
+      setFormOpen(false);
+    } catch {
+      toast.error("Öneri kaydedilemedi", { description: "Lütfen tekrar deneyin." });
+    } finally {
+      setSubmitting(false);
+    }
+  };
+
+  return (
+    <section className="space-y-3">
+      <div className="flex flex-wrap items-center justify-between gap-2">
+        <div>
+          <h2 className="text-sm font-semibold">Topluluk muadil önerileri</h2>
+          <p className="mt-0.5 text-xs text-muted-foreground">
+            Bu kodun muadilini biliyorsanız marka + parça kodu olarak ekleyin.
+          </p>
+        </div>
+        <Button type="button" variant="outline" size="sm" onClick={() => setFormOpen((o) => !o)}>
+          <Plus className="mr-1.5 size-4" />
+          Muadil öner
+        </Button>
+      </div>
+
+      {formOpen && (
+        <form
+          onSubmit={submit}
+          className="flex flex-col gap-2 rounded-xl border border-border bg-background p-3 sm:flex-row"
+        >
+          <Input
+            value={brand}
+            onChange={(e) => setBrand(e.target.value)}
+            placeholder="Marka (ör. Bosch)"
+            required
+            minLength={2}
+            maxLength={80}
+            className="sm:max-w-48"
+          />
+          <Input
+            value={code}
+            onChange={(e) => setCode(e.target.value)}
+            placeholder="Parça kodu"
+            required
+            minLength={2}
+            maxLength={100}
+            className="font-mono"
+          />
+          <Button type="submit" disabled={submitting}>
+            {submitting ? "Gönderiliyor…" : "Gönder"}
+          </Button>
+        </form>
+      )}
+
+      {suggestions === null ? (
+        <Skeleton className="h-14 w-full rounded-xl" />
+      ) : suggestions.length === 0 ? (
+        <p className="rounded-xl border border-dashed border-border px-4 py-6 text-center text-sm text-muted-foreground">
+          Henüz öneri yok — muadilini biliyorsanız ilk öneriyi siz ekleyin.
+        </p>
+      ) : (
+        <ul className="divide-y divide-border overflow-hidden rounded-xl border border-border">
+          {suggestions.map((s) => (
+            <li
+              key={`${s.brand.toLocaleLowerCase("tr-TR")}|${s.code}`}
+              className="flex items-center justify-between gap-3 bg-background px-4 py-2.5"
+            >
+              <span className="min-w-0">
+                <span className="text-sm font-medium">{s.brand}</span>{" "}
+                <Link
+                  to="/dashboard/oem/$code"
+                  params={{ code: s.code }}
+                  className="font-mono text-xs underline decoration-dotted underline-offset-2 hover:decoration-solid"
+                >
+                  {s.code}
+                </Link>
+                {s.mine && (
+                  <span className="ml-2 text-[10px] font-semibold uppercase tracking-wide text-primary">
+                    sizin öneriniz
+                  </span>
+                )}
+              </span>
+              <Badge variant="secondary" title="Bu muadili öneren kullanıcı sayısı">
+                <Users className="mr-1 size-3" />
+                {s.count}
+              </Badge>
+            </li>
+          ))}
+        </ul>
+      )}
+    </section>
+  );
+}

apps/web/src/components/catalog/oem-vote-card.tsx

@@ -0,0 +1,170 @@
+import { api } from "@/lib/api-client";
+import { capture } from "@/lib/posthog";
+import { toast } from "@/lib/toast";
+import { cn } from "@sase/ui";
+import { Link } from "@tanstack/react-router";
+import { Car, ThumbsDown, ThumbsUp } from "lucide-react";
+import { useEffect, useState } from "react";
+
+export type OemVoteChoice = "compatible" | "incompatible";
+
+export interface OemVoteSummary {
+  compatible: number;
+  incompatible: number;
+  myVote: OemVoteChoice | null;
+}
+
+export interface CastOemVoteResult {
+  oemCode: string;
+  myVote: OemVoteChoice;
+  counts: { compatible: number; incompatible: number };
+  pointsAwarded: number;
+  correct: boolean | null;
+  isNew: boolean;
+}
+
+interface OemVoteCardProps {
+  oemCode: string;
+  // Katalogdan gelişte taşınan bağlam: "neyle neyin uyumlu olduğu" tek alanda
+  // görünsün diye butonların üstünde araç + parça adı gösterilir. Doğrudan
+  // ziyarette (bağlam yok) genel soru metnine düşülür.
+  vehicleLabel?: string;
+  partName?: string;
+  vehicleId?: string;
+  className?: string;
+}
+
+const EMPTY_SUMMARY: OemVoteSummary = { compatible: 0, incompatible: 0, myVote: null };
+
+// OEM detay başlığındaki topluluk oyu kartı: uyumlu/uyumsuz + sayaçlar.
+// Arkaplanı sayfayla aynı (dolgu yok, yalnız çerçeve). Puan kuralı yalnız
+// Parça Uzmanları sayfasında yazılıdır; burada toast geri bildirimi yeter.
+export function OemVoteCard({
+  oemCode,
+  vehicleLabel,
+  partName,
+  vehicleId,
+  className,
+}: OemVoteCardProps) {
+  const [summary, setSummary] = useState<OemVoteSummary | null>(null);
+  const [pending, setPending] = useState(false);
+
+  const context = [vehicleLabel, partName].filter(Boolean).join(" · ");
+
+  useEffect(() => {
+    let cancelled = false;
+    setSummary(null);
+    api
+      .post<{ votes: Record<string, OemVoteSummary> }>("/oem-votes/lookup", { codes: [oemCode] })
+      .then((res) => {
+        if (!cancelled) setSummary(res?.votes?.[oemCode] ?? EMPTY_SUMMARY);
+      })
+      .catch(() => {
+        if (!cancelled) setSummary(EMPTY_SUMMARY);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [oemCode]);
+
+  const cast = async (vote: OemVoteChoice) => {
+    setPending(true);
+    try {
+      const result = await api.post<CastOemVoteResult>("/oem-votes", {
+        oemCode,
+        vote,
+        vehicleId,
+      });
+      setSummary({ ...result.counts, myVote: result.myVote });
+      if (result.isNew) {
+        const isFirstVote = result.counts.compatible + result.counts.incompatible === 1;
+        toast.success(`+${result.pointsAwarded} puan kazandınız!`, {
+          description: isFirstVote
+            ? "Bu OEM kodunu ilk değerlendiren sizsiniz."
+            : result.correct
+              ? "Çoğunluk görüşüyle aynı yöndesiniz."
+              : "Oyunuz kaydedildi — çoğunluk şimdilik farklı görüşte.",
+        });
+      } else {
+        toast.info("Oyunuz güncellendi.");
+      }
+      capture("oem_vote_cast", {
+        oem_code: oemCode,
+        vote,
+        points_awarded: result.pointsAwarded,
+        correct: result.correct,
+        is_new: result.isNew,
+        vehicle_id: vehicleId,
+        surface: "oem_detail",
+      });
+    } catch {
+      toast.error("Oy kaydedilemedi", { description: "Lütfen tekrar deneyin." });
+    } finally {
+      setPending(false);
+    }
+  };
+
+  // Sayaçlar bilinçli olarak gösterilmiyor (çoğunluğu ele vermek oyu yönlendirir);
+  // özet yine de çekilir — kullanıcının kendi oyu butonda işaretli kalır.
+  const options = [
+    {
+      vote: "compatible" as const,
+      icon: ThumbsUp,
+      label: "Uyumlu",
+      activeClass: "border-green-500/50 bg-green-500/10 text-green-500",
+    },
+    {
+      vote: "incompatible" as const,
+      icon: ThumbsDown,
+      label: "Uyumsuz",
+      activeClass: "border-red-500/50 bg-red-500/10 text-red-500",
+    },
+  ];
+
+  return (
+    <section className={cn("rounded-xl border border-border p-4", className)}>
+      <h2 className="text-sm font-semibold">Topluluk uyumluluk oyu</h2>
+      {context ? (
+        <p className="mt-1 flex items-center gap-1.5 text-xs text-muted-foreground">
+          <Car className="size-3.5 shrink-0" />
+          <span className="truncate" title={context}>
+            {context}
+          </span>
+        </p>
+      ) : (
+        <p className="mt-1 text-xs text-muted-foreground">
+          Bu OEM kodu sizce doğru mu? Oyunuz diğer parça satıcılarına yol gösterir.
+        </p>
+      )}
+      <div className="mt-3 flex gap-2">
+        {options.map(({ vote, icon: Icon, label, activeClass }) => {
+          const isActive = summary?.myVote === vote;
+          return (
+            <button
+              key={vote}
+              type="button"
+              disabled={pending || summary === null}
+              aria-pressed={isActive}
+              onClick={() => cast(vote)}
+              className={cn(
+                "inline-flex flex-1 items-center justify-center gap-2 rounded-lg border px-3 py-2 text-sm font-medium transition-colors disabled:opacity-50",
+                isActive
+                  ? activeClass
+                  : "border-border text-muted-foreground hover:bg-accent hover:text-foreground",
+              )}
+            >
+              <Icon className="size-4 shrink-0" fill={isActive ? "currentColor" : "none"} />
+              {label}
+            </button>
+          );
+        })}
+      </div>
+      <p className="mt-3 text-xs text-muted-foreground">
+        Her oy puan kazandırır ·{" "}
+        <Link to="/dashboard/uzmanlar" className="font-medium text-primary hover:underline">
+          Parça Uzmanları sıralaması
+        </Link>
+      </p>
+    </section>
+  );
+}

apps/web/src/components/gamification/leaderboard-podium.tsx

@@ -0,0 +1,96 @@
+// Trophy Gamification UI Kit'in leaderboard-podium bileşeni (MIT, ui.trophy.so)
+// sase'ye uyarlandı: shadcn yerine @sase/ui, cva bağımlılığı söküldü, rank
+// renk token'ları somut Tailwind renklerine bağlandı, avatar servisi yerine
+// maskeli adın ilk harfi gösteriliyor (liderlik listesi KVKK-maskeli).
+import { cn } from "@sase/ui";
+import { Crown } from "lucide-react";
+
+export interface PodiumRanking {
+  userId: string;
+  userName: string | null;
+  rank: number;
+  value: number;
+}
+
+const PODIUM_CONFIG = {
+  1: { color: "text-amber-400", bg: "bg-amber-400/50", height: "h-32" },
+  2: { color: "text-zinc-400", bg: "bg-zinc-400/30", height: "h-24" },
+  3: { color: "text-orange-700", bg: "bg-orange-700/40", height: "h-20" },
+} as const;
+
+interface LeaderboardPodiumProps {
+  /** İlk 3 sıra (rank 1-3 beklenir) */
+  rankings: PodiumRanking[];
+  showValue?: boolean;
+  className?: string;
+}
+
+export function LeaderboardPodium({
+  rankings,
+  showValue = true,
+  className,
+}: LeaderboardPodiumProps) {
+  // Kürsü dizilimi: 2. — 1. — 3.
+  const top3 = rankings.slice(0, 3);
+  const podiumOrder = [
+    top3.find((r) => r.rank === 2),
+    top3.find((r) => r.rank === 1),
+    top3.find((r) => r.rank === 3),
+  ].filter((r): r is PodiumRanking => Boolean(r));
+
+  if (podiumOrder.length === 0) return null;
+
+  return (
+    <ul
+      className={cn("flex items-end justify-center gap-4", className)}
+      aria-label="İlk 3 sıralama"
+    >
+      {podiumOrder.map((ranking) => {
+        const config = PODIUM_CONFIG[ranking.rank as 1 | 2 | 3];
+        if (!config) return null;
+        const displayName = ranking.userName || "Üye";
+
+        return (
+          <li
+            key={ranking.userId}
+            aria-label={`Sıra ${ranking.rank}: ${displayName}${showValue ? `, ${ranking.value.toLocaleString("tr-TR")} puan` : ""}`}
+            className="flex flex-col items-center"
+          >
+            <div className="relative mb-2" aria-hidden="true">
+              <div
+                className={cn(
+                  "flex h-14 w-14 items-center justify-center rounded-full text-lg font-semibold",
+                  config.bg,
+                )}
+              >
+                {displayName.charAt(0)}
+              </div>
+              <div className="absolute -bottom-1 -right-1 flex h-6 w-6 items-center justify-center rounded-full bg-background shadow-sm">
+                <Crown className={cn("h-4 w-4", config.color)} />
+              </div>
+            </div>
+
+            <span className="max-w-20 truncate text-center text-sm font-medium" title={displayName}>
+              {displayName}
+            </span>
+
+            {showValue && (
+              <span className="text-sm tabular-nums text-muted-foreground">
+                {ranking.value.toLocaleString("tr-TR")}
+              </span>
+            )}
+
+            <div
+              className={cn("mt-2 w-22 rounded-t-lg", config.height, config.bg)}
+              aria-hidden="true"
+            >
+              <div className={cn("flex h-8 items-center justify-center font-bold", config.color)}>
+                {ranking.rank}
+              </div>
+            </div>
+          </li>
+        );
+      })}
+    </ul>
+  );
+}

apps/web/src/components/gamification/leaderboard-rankings.tsx

@@ -0,0 +1,166 @@
+// Trophy Gamification UI Kit'in leaderboard-rankings bileşeni (MIT, ui.trophy.so)
+// sase'ye uyarlandı: @sase/ui importları, Türkçe metinler, avatar yerine
+// maskeli adın ilk harfi, currentUserId karşılaştırması yerine isCurrentUser
+// bayrağı (liderlik cevabı kullanıcı id'si sızdırmaz).
+import { Button, cn } from "@sase/ui";
+import { ChevronLeft, ChevronRight, Crown } from "lucide-react";
+import { useEffect, useMemo, useState } from "react";
+
+export interface LeaderboardRankingItem {
+  userId: string;
+  userName: string | null;
+  rank: number;
+  value: number;
+  byline?: string | null;
+  isCurrentUser?: boolean;
+}
+
+interface LeaderboardRankingsProps {
+  rankings: LeaderboardRankingItem[];
+  showPagination?: boolean;
+  defaultPageSize?: 10 | 25 | 50 | 100;
+  className?: string;
+}
+
+const crownColorMap = {
+  1: "text-amber-400",
+  2: "text-zinc-400",
+  3: "text-orange-700",
+} as const;
+
+const pageSizeOptions = [10, 25, 50, 100] as const;
+
+function formatLeaderboardValue(value: number) {
+  if (value >= 1_000_000) return `${(value / 1_000_000).toFixed(1)}m`;
+  if (value >= 1_000) return `${(value / 1_000).toFixed(1)}k`;
+  return value.toLocaleString("tr-TR");
+}
+
+export function LeaderboardRankings({
+  rankings,
+  showPagination = false,
+  defaultPageSize = 25,
+  className,
+}: LeaderboardRankingsProps) {
+  const [pageSize, setPageSize] = useState<10 | 25 | 50 | 100>(defaultPageSize);
+  const [currentPage, setCurrentPage] = useState(1);
+
+  const totalPages = Math.max(1, Math.ceil(rankings.length / pageSize));
+
+  useEffect(() => {
+    setCurrentPage(1);
+  }, []);
+
+  useEffect(() => {
+    if (currentPage > totalPages) setCurrentPage(totalPages);
+  }, [currentPage, totalPages]);
+
+  const pagedRankings = useMemo(
+    () =>
+      showPagination
+        ? rankings.slice((currentPage - 1) * pageSize, currentPage * pageSize)
+        : rankings,
+    [rankings, showPagination, currentPage, pageSize],
+  );
+
+  return (
+    <div className={cn("w-full rounded-xl border bg-card", className)}>
+      <ul aria-label="Parça uzmanları sıralaması" className="divide-y divide-border">
+        {pagedRankings.map((ranking) => {
+          const displayName = ranking.userName || "Üye";
+          const showCrown = ranking.rank <= 3;
+          const crownColor = crownColorMap[ranking.rank as 1 | 2 | 3];
+
+          return (
+            <li
+              key={ranking.userId}
+              className={cn(
+                "flex items-center gap-2 px-4 py-2",
+                ranking.isCurrentUser && "rounded-md border-2 border-primary bg-muted",
+              )}
+            >
+              <div className="flex w-12 items-center gap-1">
+                <span className="w-4 text-sm font-semibold tabular-nums">{ranking.rank}</span>
+                {showCrown ? (
+                  <Crown className={cn("h-5 w-5", crownColor)} aria-hidden="true" />
+                ) : null}
+              </div>
+
+              <div className="flex h-10 w-10 items-center justify-center rounded-full bg-muted text-sm font-medium text-muted-foreground">
+                {displayName.charAt(0).toLocaleUpperCase("tr-TR")}
+              </div>
+
+              <div className="min-w-0 flex-1">
+                <p className="truncate font-medium text-foreground">
+                  {displayName}
+                  {ranking.isCurrentUser && (
+                    <span className="ml-2 text-xs font-semibold text-primary">(Siz)</span>
+                  )}
+                </p>
+                {ranking.byline ? (
+                  <p className="truncate text-sm text-muted-foreground">{ranking.byline}</p>
+                ) : null}
+              </div>
+
+              <p className="font-semibold leading-none tabular-nums">
+                {formatLeaderboardValue(ranking.value)}
+              </p>
+            </li>
+          );
+        })}
+      </ul>
+
+      {showPagination ? (
+        <div className="flex items-center justify-between gap-3 border-t px-4 py-2">
+          <div className="flex items-center gap-2">
+            <label htmlFor="leaderboard-page-size" className="text-sm text-muted-foreground">
+              Göster
+            </label>
+            <select
+              id="leaderboard-page-size"
+              value={pageSize}
+              onChange={(e) => {
+                setPageSize(Number(e.target.value) as 10 | 25 | 50 | 100);
+                setCurrentPage(1);
+              }}
+              className="rounded-md border bg-background px-2 py-1 text-sm text-muted-foreground"
+            >
+              {pageSizeOptions.map((option) => (
+                <option key={option} value={option}>
+                  {option}
+                </option>
+              ))}
+            </select>
+          </div>
+
+          <div className="flex items-center gap-2">
+            <Button
+              variant="ghost"
+              size="icon"
+              aria-label="Önceki sayfa"
+              onClick={() => setCurrentPage((p) => Math.max(1, p - 1))}
+              disabled={currentPage === 1}
+              className="rounded-md border p-1.5 transition-colors hover:bg-muted disabled:cursor-not-allowed disabled:opacity-50"
+            >
+              <ChevronLeft className="h-4 w-4" />
+            </Button>
+
+            <span className="text-sm text-muted-foreground">
+              Sayfa {currentPage} / {totalPages}
+            </span>
+            <Button
+              variant="ghost"
+              size="icon"
+              aria-label="Sonraki sayfa"
+              onClick={() => setCurrentPage((p) => Math.min(totalPages, p + 1))}
+              disabled={currentPage === totalPages}
+              className="rounded-md border p-1.5 transition-colors hover:bg-muted disabled:cursor-not-allowed disabled:opacity-50"
+            >
+              <ChevronRight className="h-4 w-4" />
+            </Button>
+          </div>
+        </div>
+      ) : null}
+    </div>
+  );
+}

apps/web/src/components/gamification/points-badge.tsx

@@ -0,0 +1,44 @@
+// Trophy Gamification UI Kit'in points-badge bileşeni (MIT, ui.trophy.so)
+// sase'ye uyarlandı: @sase/ui importları, cva bağımlılığı söküldü.
+import { cn } from "@sase/ui";
+import { Sparkle } from "lucide-react";
+
+interface PointsBadgeProps {
+  name: string;
+  total: number;
+  icon?: React.ComponentType<{ className?: string }>;
+  formatValue?: (value: number) => string;
+  className?: string;
+}
+
+export function PointsBadge({
+  name,
+  total,
+  icon: CustomIcon,
+  formatValue,
+  className,
+}: PointsBadgeProps) {
+  const Icon = CustomIcon ?? Sparkle;
+  const displayValue = formatValue ? formatValue(total) : total.toLocaleString("tr-TR");
+
+  return (
+    <output
+      aria-label={`${displayValue} ${name}`}
+      className={cn(
+        "flex items-center gap-3 rounded-lg border bg-card p-4 transition-colors",
+        className,
+      )}
+    >
+      <div className="flex items-center gap-2">
+        <div
+          aria-hidden="true"
+          className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-primary/10"
+        >
+          <Icon className="h-5 w-5 text-primary" />
+        </div>
+        <span className="text-xl font-bold tabular-nums">{displayValue}</span>
+      </div>
+      <span className="truncate text-muted-foreground">{name}</span>
+    </output>
+  );
+}

apps/web/src/components/schema/__tests__/parts-panel.test.tsx

@@ -27,6 +27,7 @@ vi.mock("@/stores/schema.store", () => ({
   }),
 }));
 
+import { api } from "@/lib/api-client";
 import { PartsPanel } from "../parts-panel";
 
 const buildPart = (overrides: Partial<Part> = {}): Part => ({
@@ -49,6 +50,7 @@ beforeEach(() => {
   captureMock.mockClear();
   setSelectedGroupMock.mockClear();
   setHighlightedGroupMock.mockClear();
+  vi.mocked(api.post).mockReset().mockResolvedValue({});
 });
 
 afterEach(() => {
@@ -148,4 +150,27 @@ describe("PartsPanel", () => {
       parts_count: parts.length,
     });
   });
+
+  it("links every OEM code to the detail page without a /p/matched gate", () => {
+    const postMock = vi.mocked(api.post);
+
+    render(<PartsPanel parts={[buildPart()]} vehicleId="v1" categoryId="c1" />);
+
+    const link = screen.getByRole("link", { name: "OEM-1" });
+    // href bağlam taşır: parça adı + vehicleId (oy kartındaki "araç · parça" satırı)
+    expect(link.getAttribute("href")).toContain("/dashboard/oem/OEM-1");
+    expect(link.getAttribute("href")).toContain("vid=v1");
+    // Liste açılışı artık toplu istek atmaz (/p/matched ve oy lookup'ı kalktı);
+    // tek istisna kopyalama anındaki fire-and-forget analytics POST'udur.
+    expect(postMock).not.toHaveBeenCalled();
+  });
+
+  it("does not render Uyum or Adet columns", () => {
+    render(<PartsPanel parts={[buildPart({ quantity: 4 })]} />);
+
+    expect(screen.queryByText("Adet")).not.toBeInTheDocument();
+    expect(screen.queryByText("Uyum")).not.toBeInTheDocument();
+    const headers = screen.getAllByRole("columnheader").map((th) => th.textContent);
+    expect(headers).toEqual(["#", "Parça Adı", "OEM Kodu", "Pozisyon"]);
+  });
 });

apps/web/src/components/schema/parts-panel.tsx

@@ -22,6 +22,17 @@ interface PartsPanelProps {
 
 const SKELETON_ROW_KEYS = ["s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7"] as const;
 
+// OEM detay linki, oy kartının "araç · parça" bağlam satırı için görüntü
+// bağlamını search-param olarak taşır (v/p/vid; oem.$code validateSearch).
+function oemDetailHref(code: string, search: { v?: string; p?: string; vid?: string }) {
+  const qs = new URLSearchParams();
+  if (search.v) qs.set("v", search.v);
+  if (search.p) qs.set("p", search.p);
+  if (search.vid) qs.set("vid", search.vid);
+  const tail = qs.toString();
+  return `/dashboard/oem/${encodeURIComponent(code)}${tail ? `?${tail}` : ""}`;
+}
+
 export function PartsPanel({
   parts,
   vehicleId,
@@ -37,34 +48,6 @@ export function PartsPanel({
   const viewedKeyRef = useRef<string | null>(null);
   const [copiedId, setCopiedId] = useState<string | null>(null);
   const [resolvingCode, setResolvingCode] = useState<string | null>(null);
-  // OEM codes that resolve to a non-empty cross-reference page. Only these are
-  // rendered as links — unmatched codes stay plain text so a click never lands
-  // on an empty "no equivalents" page. One batch lookup per parts list.
-  const [matchedOemCodes, setMatchedOemCodes] = useState<Set<string>>(new Set());
-
-  const oemCodes = useMemo(
-    () => [...new Set(parts.map((p) => p.oemCode).filter((c) => c && c !== "N/A"))],
-    [parts],
-  );
-
-  useEffect(() => {
-    if (oemCodes.length === 0) {
-      setMatchedOemCodes(new Set());
-      return;
-    }
-    let cancelled = false;
-    api
-      .post<{ matched: string[] }>("/p/matched", { codes: oemCodes })
-      .then((res) => {
-        if (!cancelled) setMatchedOemCodes(new Set(res?.matched ?? []));
-      })
-      .catch(() => {
-        if (!cancelled) setMatchedOemCodes(new Set());
-      });
-    return () => {
-      cancelled = true;
-    };
-  }, [oemCodes]);
 
   // PL24 "bk. tablo:NNN-NNN" cross-reference jump. Resolved at load → open the
   // target illustration directly. Unresolved (target branch not seeded yet) →
@@ -265,7 +248,6 @@ export function PartsPanel({
                 <th className="px-3 py-2 w-10">#</th>
                 <th className="px-3 py-2">Parça Adı</th>
                 <th className="px-3 py-2">OEM Kodu</th>
-                <th className="px-3 py-2 w-14 text-center">Adet</th>
                 <th className="px-3 py-2">Pozisyon</th>
                 {hasPrices && <th className="px-3 py-2 text-right">Fiyat</th>}
               </tr>
@@ -290,7 +272,7 @@ export function PartsPanel({
                   return (
                     <tr key={part.id} className="border-b border-border/50 bg-muted/20">
                       <td className="px-3 py-2 text-muted-foreground">{part.hotspotIndex}</td>
-                      <td className="px-3 py-2" colSpan={hasPrices ? 5 : 4}>
+                      <td className="px-3 py-2" colSpan={hasPrices ? 4 : 3}>
                         {label && <span className="font-medium">{label}</span>}
                         <span className="mt-1 flex flex-wrap items-center gap-x-3 gap-y-1">
                           {refs.map((ref) => {
@@ -393,16 +375,19 @@ export function PartsPanel({
                             )}
                           </button>
                         )}
-                        {part.oemCode &&
-                        part.oemCode !== "N/A" &&
-                        matchedOemCodes.has(part.oemCode) ? (
-                          // Link ONLY codes with a real cross-reference. Plain
-                          // left-click → in-app client navigation (no full SPA
-                          // reload — the new-tab boot was the slow part). Real href
-                          // kept so ctrl/cmd/middle-click still opens a new tab.
-                          // Unmatched codes fall through to plain text.
+                        {part.oemCode && part.oemCode !== "N/A" ? (
+                          // Every code links to the OEM detail page — without a P
+                          // cross-reference the page still carries the community
+                          // vote, equivalent suggestions and the reverse catalog.
+                          // Plain left-click → in-app client navigation (no full
+                          // SPA reload); real href kept so ctrl/cmd/middle-click
+                          // still opens a new tab.
                           <a
-                            href={`/dashboard/oem/${encodeURIComponent(part.oemCode)}`}
+                            href={oemDetailHref(part.oemCode, {
+                              v: vehicleLabel,
+                              p: part.name,
+                              vid: vehicleId,
+                            })}
                             title="Uyumlu parça kodlarını gör"
                             className="underline decoration-dotted underline-offset-2 transition-colors hover:text-foreground hover:decoration-solid"
                             onClick={(e) => {
@@ -418,6 +403,7 @@ export function PartsPanel({
                               navigate({
                                 to: "/dashboard/oem/$code",
                                 params: { code: part.oemCode },
+                                search: { v: vehicleLabel, p: part.name, vid: vehicleId },
                               });
                             }}
                           >
@@ -428,7 +414,6 @@ export function PartsPanel({
                         )}
                       </span>
                     </td>
-                    <td className="px-3 py-2 text-center">{part.quantity}</td>
                     <td className="px-3 py-2 text-muted-foreground">{part.position}</td>
                     {hasPrices && (
                       <td className="px-3 py-2 text-right text-xs">

apps/web/src/components/settings/changelog-tab.tsx

@@ -1,118 +0,0 @@
-import { useChangelog } from "@/hooks/use-changelog";
-import { useTranslation } from "@/lib/i18n";
-import type { ChangelogEntry } from "@sase/shared";
-import {
-  Accordion,
-  AccordionContent,
-  AccordionItem,
-  AccordionTrigger,
-  Badge,
-  Card,
-  CardContent,
-  CardDescription,
-  CardHeader,
-  CardTitle,
-  Skeleton,
-} from "@sase/ui";
-import { CalendarDays } from "lucide-react";
-
-function formatDate(iso: string, locale: "tr" | "en"): string {
-  const date = new Date(iso);
-  const options: Intl.DateTimeFormatOptions = {
-    day: "numeric",
-    month: "long",
-    year: "numeric",
-  };
-  return date.toLocaleDateString(locale === "tr" ? "tr-TR" : "en-US", options);
-}
-
-function changeTypeLabel(
-  changeType: ChangelogEntry["changeType"],
-  t: (key: string) => string,
-): string {
-  return t(`settings.changelog.changeType.${changeType}`);
-}
-
-function ChangelogSkeleton() {
-  return (
-    <div className="space-y-0">
-      {[1, 2, 3].map((i) => (
-        <div key={i} className="relative pb-6 pl-8">
-          <div className="absolute left-0 top-1.5 h-2.5 w-2.5 rounded-full bg-muted-foreground/20" />
-          <div className="space-y-2">
-            <div className="flex items-center gap-2">
-              <Skeleton className="h-5 w-16 rounded-md" />
-              <Skeleton className="h-5 w-48" />
-            </div>
-            <Skeleton className="h-4 w-28" />
-          </div>
-        </div>
-      ))}
-    </div>
-  );
-}
-
-function ChangelogEmpty({ t }: { t: (key: string) => string }) {
-  return (
-    <Card className="border-dashed">
-      <CardHeader className="text-center">
-        <CalendarDays className="mx-auto h-10 w-10 text-muted-foreground" />
-        <CardTitle>{t("settings.changelog.emptyTitle")}</CardTitle>
-        <CardDescription>{t("settings.changelog.emptyDescription")}</CardDescription>
-      </CardHeader>
-    </Card>
-  );
-}
-
-export function ChangelogTab() {
-  const { data: entries, isLoading } = useChangelog();
-  const { t, locale } = useTranslation();
-
-  if (isLoading) {
-    return <ChangelogSkeleton />;
-  }
-
-  if (!entries || entries.length === 0) {
-    return <ChangelogEmpty t={t} />;
-  }
-
-  return (
-    <Card>
-      <CardHeader>
-        <CardTitle>{t("settings.changelog.title")}</CardTitle>
-        <CardDescription>{t("settings.changelog.description")}</CardDescription>
-      </CardHeader>
-      <CardContent>
-        <Accordion
-          type="single"
-          collapsible
-          className="relative border-l-2 border-muted-foreground/20"
-        >
-          {entries.map((entry) => (
-            <AccordionItem key={entry.id} value={entry.id} className="border-b-0 pl-6">
-              <div className="absolute left-[-5px] mt-6 h-2.5 w-2.5 rounded-full border-2 border-background bg-foreground dark:bg-primary" />
-              <AccordionTrigger className="py-3 hover:no-underline">
-                <div className="flex flex-col items-start gap-1.5 text-left">
-                  <div className="flex flex-wrap items-center gap-2">
-                    <Badge changeType={entry.changeType}>
-                      {changeTypeLabel(entry.changeType, t)}
-                    </Badge>
-                    <span className="font-medium">{entry.title}</span>
-                  </div>
-                  <span className="text-xs text-muted-foreground">
-                    {formatDate(entry.publishedAt, locale)}
-                  </span>
-                </div>
-              </AccordionTrigger>
-              <AccordionContent>
-                <div className="text-sm text-muted-foreground leading-relaxed whitespace-pre-wrap">
-                  {entry.description}
-                </div>
-              </AccordionContent>
-            </AccordionItem>
-          ))}
-        </Accordion>
-      </CardContent>
-    </Card>
-  );
-}

apps/web/src/hooks/use-changelog.ts

@@ -1,11 +0,0 @@
-import { api } from "@/lib/api-client";
-import type { ChangelogEntry } from "@sase/shared";
-import { useQuery } from "@tanstack/react-query";
-
-export function useChangelog() {
-  return useQuery({
-    queryKey: ["changelog"],
-    queryFn: () => api.get<ChangelogEntry[]>("/changelog"),
-    staleTime: 30 * 60 * 1000, // 30 min — matches Redis cache TTL
-  });
-}

apps/web/src/hooks/use-expert-access.ts

@@ -0,0 +1,15 @@
+import { api } from "@/lib/api-client";
+import { useQuery } from "@tanstack/react-query";
+
+// Parça Uzmanları programı kapısı: PostHog ana şalteri + kullanım kriteri
+// sunucuda birlikte değerlendirilir; web yalnız sonucu sorar. Kapalıysa
+// program yüzeyleri (nav linki, oy kartı, öneri bölümü, uzmanlar sayfası)
+// hiç render edilmez — kriterler istemciye sızdırılmaz.
+export function useExpertAccess(enabled = true) {
+  return useQuery({
+    queryKey: ["expert-access"],
+    queryFn: () => api.get<{ enabled: boolean }>("/oem-votes/access"),
+    staleTime: 5 * 60_000,
+    enabled,
+  });
+}

apps/web/src/messages/en.json

@@ -74,6 +74,7 @@
     "dashboard": "Dashboard",
     "search": "Search",
     "history": "History",
+    "experts": "Parts Experts",
     "catalog": "Catalog",
     "subscription": "Subscription",
     "billing": "Payment",
@@ -82,7 +83,6 @@
     "logout": "Log Out",
     "contact": "Contact",
     "blog": "Blog",
-    "changelog": "What's New",
     "account": "Account",
     "sectionMain": "Main Menu",
     "sectionAccount": "Account",
@@ -522,7 +522,6 @@
       "connections": "Connections",
       "referral": "Referral",
       "account": "Account",
-      "changelog": "Changelog",
       "notifications": "Notifications"
     },
     "preferences": {
@@ -593,17 +592,6 @@
       "typeConfirm": "Type 'DELETE' to confirm",
       "confirmWord": "DELETE"
     },
-    "changelog": {
-      "title": "Changelog",
-      "description": "Latest platform updates, new features, and bug fixes.",
-      "emptyTitle": "No updates yet",
-      "emptyDescription": "Platform updates will appear here soon.",
-      "changeType": {
-        "fix": "Fix",
-        "feature": "New Feature",
-        "improvement": "Improvement"
-      }
-    },
     "notifications": {
       "title": "Notification preferences",
       "description": "Choose which lifecycle e-mails you want to receive. Account security and payment notifications keep coming."

apps/web/src/messages/tr.json

@@ -74,6 +74,7 @@
     "dashboard": "Gösterge Paneli",
     "search": "Arama",
     "history": "Geçmiş",
+    "experts": "Parça Uzmanları",
     "catalog": "Katalog",
     "subscription": "Abonelik",
     "billing": "Ödeme",
@@ -82,7 +83,6 @@
     "logout": "Çıkış Yap",
     "contact": "İletişim",
     "blog": "Blog",
-    "changelog": "Yenilikler",
     "account": "Hesap",
     "sectionMain": "Ana Menü",
     "sectionAccount": "Hesap",
@@ -522,7 +522,6 @@
       "connections": "Bağlantılar",
       "referral": "Referans",
       "account": "Hesap",
-      "changelog": "Değişiklik Günlüğü",
       "notifications": "Bildirimler"
     },
     "preferences": {
@@ -593,17 +592,6 @@
       "typeConfirm": "Onaylamak için 'SİL' yazın",
       "confirmWord": "SİL"
     },
-    "changelog": {
-      "title": "Değişiklik Günlüğü",
-      "description": "Platformdaki son güncellemeler, yeni özellikler ve hata düzeltmeleri.",
-      "emptyTitle": "Henüz güncelleme yok",
-      "emptyDescription": "Yakında platform güncellemeleri burada görünecek.",
-      "changeType": {
-        "fix": "Düzeltme",
-        "feature": "Yeni Özellik",
-        "improvement": "Geliştirme"
-      }
-    },
     "notifications": {
       "title": "Bildirim tercihleri",
       "description": "Hangi lifecycle maillerini almak istediğini seç. Hesap güvenliği ve ödeme bildirimleri her zaman gelmeye devam eder."

apps/web/src/routeTree.gen.ts

@@ -21,12 +21,12 @@ import { Route as AboutRouteImport } from './routes/about'
 import { Route as AuthRouteImport } from './routes/_auth'
 import { Route as IndexRouteImport } from './routes/index'
 import { Route as DashboardIndexRouteImport } from './routes/dashboard/index'
+import { Route as DashboardUzmanlarRouteImport } from './routes/dashboard/uzmanlar'
 import { Route as DashboardSettingsRouteImport } from './routes/dashboard/settings'
 import { Route as DashboardServiceTestRouteImport } from './routes/dashboard/service-test'
 import { Route as DashboardSearchRouteImport } from './routes/dashboard/search'
 import { Route as DashboardHistoryRouteImport } from './routes/dashboard/history'
 import { Route as DashboardContactRouteImport } from './routes/dashboard/contact'
-import { Route as DashboardChangelogRouteImport } from './routes/dashboard/changelog'
 import { Route as DashboardBlogRouteImport } from './routes/dashboard/blog'
 import { Route as DashboardBillingRouteImport } from './routes/dashboard/billing'
 import { Route as BlogSlugRouteImport } from './routes/blog_/$slug'
@@ -117,6 +117,11 @@ const DashboardIndexRoute = DashboardIndexRouteImport.update({
   path: '/',
   getParentRoute: () => DashboardRoute,
 } as any)
+const DashboardUzmanlarRoute = DashboardUzmanlarRouteImport.update({
+  id: '/uzmanlar',
+  path: '/uzmanlar',
+  getParentRoute: () => DashboardRoute,
+} as any)
 const DashboardSettingsRoute = DashboardSettingsRouteImport.update({
   id: '/settings',
   path: '/settings',
@@ -142,11 +147,6 @@ const DashboardContactRoute = DashboardContactRouteImport.update({
   path: '/contact',
   getParentRoute: () => DashboardRoute,
 } as any)
-const DashboardChangelogRoute = DashboardChangelogRouteImport.update({
-  id: '/changelog',
-  path: '/changelog',
-  getParentRoute: () => DashboardRoute,
-} as any)
 const DashboardBlogRoute = DashboardBlogRouteImport.update({
   id: '/blog',
   path: '/blog',
@@ -331,12 +331,12 @@ export interface FileRoutesByFullPath {
   '/blog/$slug': typeof BlogSlugRoute
   '/dashboard/billing': typeof DashboardBillingRoute
   '/dashboard/blog': typeof DashboardBlogRoute
-  '/dashboard/changelog': typeof DashboardChangelogRoute
   '/dashboard/contact': typeof DashboardContactRoute
   '/dashboard/history': typeof DashboardHistoryRoute
   '/dashboard/search': typeof DashboardSearchRoute
   '/dashboard/service-test': typeof DashboardServiceTestRoute
   '/dashboard/settings': typeof DashboardSettingsRoute
+  '/dashboard/uzmanlar': typeof DashboardUzmanlarRoute
   '/dashboard/': typeof DashboardIndexRoute
   '/dashboard/admin/analytics': typeof DashboardAdminAnalyticsRoute
   '/dashboard/admin/copy-logs': typeof DashboardAdminCopyLogsRoute
@@ -379,12 +379,12 @@ export interface FileRoutesByTo {
   '/blog/$slug': typeof BlogSlugRoute
   '/dashboard/billing': typeof DashboardBillingRoute
   '/dashboard/blog': typeof DashboardBlogRoute
-  '/dashboard/changelog': typeof DashboardChangelogRoute
   '/dashboard/contact': typeof DashboardContactRoute
   '/dashboard/history': typeof DashboardHistoryRoute
   '/dashboard/search': typeof DashboardSearchRoute
   '/dashboard/service-test': typeof DashboardServiceTestRoute
   '/dashboard/settings': typeof DashboardSettingsRoute
+  '/dashboard/uzmanlar': typeof DashboardUzmanlarRoute
   '/dashboard': typeof DashboardIndexRoute
   '/dashboard/admin/analytics': typeof DashboardAdminAnalyticsRoute
   '/dashboard/admin/copy-logs': typeof DashboardAdminCopyLogsRoute
@@ -430,12 +430,12 @@ export interface FileRoutesById {
   '/blog_/$slug': typeof BlogSlugRoute
   '/dashboard/billing': typeof DashboardBillingRoute
   '/dashboard/blog': typeof DashboardBlogRoute
-  '/dashboard/changelog': typeof DashboardChangelogRoute
   '/dashboard/contact': typeof DashboardContactRoute
   '/dashboard/history': typeof DashboardHistoryRoute
   '/dashboard/search': typeof DashboardSearchRoute
   '/dashboard/service-test': typeof DashboardServiceTestRoute
   '/dashboard/settings': typeof DashboardSettingsRoute
+  '/dashboard/uzmanlar': typeof DashboardUzmanlarRoute
   '/dashboard/': typeof DashboardIndexRoute
   '/dashboard/admin/analytics': typeof DashboardAdminAnalyticsRoute
   '/dashboard/admin/copy-logs': typeof DashboardAdminCopyLogsRoute
@@ -481,12 +481,12 @@ export interface FileRouteTypes {
     | '/blog/$slug'
     | '/dashboard/billing'
     | '/dashboard/blog'
-    | '/dashboard/changelog'
     | '/dashboard/contact'
     | '/dashboard/history'
     | '/dashboard/search'
     | '/dashboard/service-test'
     | '/dashboard/settings'
+    | '/dashboard/uzmanlar'
     | '/dashboard/'
     | '/dashboard/admin/analytics'
     | '/dashboard/admin/copy-logs'
@@ -529,12 +529,12 @@ export interface FileRouteTypes {
     | '/blog/$slug'
     | '/dashboard/billing'
     | '/dashboard/blog'
-    | '/dashboard/changelog'
     | '/dashboard/contact'
     | '/dashboard/history'
     | '/dashboard/search'
     | '/dashboard/service-test'
     | '/dashboard/settings'
+    | '/dashboard/uzmanlar'
     | '/dashboard'
     | '/dashboard/admin/analytics'
     | '/dashboard/admin/copy-logs'
@@ -579,12 +579,12 @@ export interface FileRouteTypes {
     | '/blog_/$slug'
     | '/dashboard/billing'
     | '/dashboard/blog'
-    | '/dashboard/changelog'
     | '/dashboard/contact'
     | '/dashboard/history'
     | '/dashboard/search'
     | '/dashboard/service-test'
     | '/dashboard/settings'
+    | '/dashboard/uzmanlar'
     | '/dashboard/'
     | '/dashboard/admin/analytics'
     | '/dashboard/admin/copy-logs'
@@ -712,6 +712,13 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof DashboardIndexRouteImport
       parentRoute: typeof DashboardRoute
     }
+    '/dashboard/uzmanlar': {
+      id: '/dashboard/uzmanlar'
+      path: '/uzmanlar'
+      fullPath: '/dashboard/uzmanlar'
+      preLoaderRoute: typeof DashboardUzmanlarRouteImport
+      parentRoute: typeof DashboardRoute
+    }
     '/dashboard/settings': {
       id: '/dashboard/settings'
       path: '/settings'
@@ -747,13 +754,6 @@ declare module '@tanstack/react-router' {
       preLoaderRoute: typeof DashboardContactRouteImport
       parentRoute: typeof DashboardRoute
     }
-    '/dashboard/changelog': {
-      id: '/dashboard/changelog'
-      path: '/changelog'
-      fullPath: '/dashboard/changelog'
-      preLoaderRoute: typeof DashboardChangelogRouteImport
-      parentRoute: typeof DashboardRoute
-    }
     '/dashboard/blog': {
       id: '/dashboard/blog'
       path: '/blog'
@@ -988,12 +988,12 @@ const AuthRouteWithChildren = AuthRoute._addFileChildren(AuthRouteChildren)
 interface DashboardRouteChildren {
   DashboardBillingRoute: typeof DashboardBillingRoute
   DashboardBlogRoute: typeof DashboardBlogRoute
-  DashboardChangelogRoute: typeof DashboardChangelogRoute
   DashboardContactRoute: typeof DashboardContactRoute
   DashboardHistoryRoute: typeof DashboardHistoryRoute
   DashboardSearchRoute: typeof DashboardSearchRoute
   DashboardServiceTestRoute: typeof DashboardServiceTestRoute
   DashboardSettingsRoute: typeof DashboardSettingsRoute
+  DashboardUzmanlarRoute: typeof DashboardUzmanlarRoute
   DashboardIndexRoute: typeof DashboardIndexRoute
   DashboardAdminAnalyticsRoute: typeof DashboardAdminAnalyticsRoute
   DashboardAdminCopyLogsRoute: typeof DashboardAdminCopyLogsRoute
@@ -1021,12 +1021,12 @@ interface DashboardRouteChildren {
 const DashboardRouteChildren: DashboardRouteChildren = {
   DashboardBillingRoute: DashboardBillingRoute,
   DashboardBlogRoute: DashboardBlogRoute,
-  DashboardChangelogRoute: DashboardChangelogRoute,
   DashboardContactRoute: DashboardContactRoute,
   DashboardHistoryRoute: DashboardHistoryRoute,
   DashboardSearchRoute: DashboardSearchRoute,
   DashboardServiceTestRoute: DashboardServiceTestRoute,
   DashboardSettingsRoute: DashboardSettingsRoute,
+  DashboardUzmanlarRoute: DashboardUzmanlarRoute,
   DashboardIndexRoute: DashboardIndexRoute,
   DashboardAdminAnalyticsRoute: DashboardAdminAnalyticsRoute,
   DashboardAdminCopyLogsRoute: DashboardAdminCopyLogsRoute,

apps/web/src/routes/dashboard.tsx

@@ -3,6 +3,7 @@ import { SiteFooter } from "@/components/site-footer";
 import { TrialUrgencyBanner } from "@/components/trial-urgency-banner";
 import { TrialValueUpsell } from "@/components/trial-value-upsell";
 import { useAuth } from "@/hooks/use-auth";
+import { useExpertAccess } from "@/hooks/use-expert-access";
 import { api } from "@/lib/api-client";
 import { useTranslation } from "@/lib/i18n";
 import { KEYS_5 } from "@/lib/keys";
@@ -31,7 +32,6 @@ import { Link, Outlet, createFileRoute, useNavigate, useRouterState } from "@tan
 import {
   BarChart3,
   BookOpen,
-  CalendarDays,
   ChevronsUpDown,
   Copy,
   CreditCard,
@@ -51,6 +51,7 @@ import {
   Shield,
   Sparkles,
   Sun,
+  Trophy,
   Users,
 } from "lucide-react";
 import { useEffect, useState } from "react";
@@ -72,6 +73,7 @@ const mainMenuItems: readonly NavItem[] = [
   { to: "/dashboard/search", labelKey: "nav.search", icon: Search },
   { to: "/dashboard/catalog", labelKey: "nav.catalog", icon: Library },
   { to: "/dashboard/history", labelKey: "nav.history", icon: History },
+  { to: "/dashboard/uzmanlar", labelKey: "nav.experts", icon: Trophy },
 ];
 
 const accountItems: readonly NavItem[] = [
@@ -81,7 +83,6 @@ const accountItems: readonly NavItem[] = [
 ];
 
 const supportItems: readonly NavItem[] = [
-  { to: "/dashboard/changelog", labelKey: "nav.changelog", icon: CalendarDays },
   { to: "/dashboard/contact", labelKey: "nav.contact", icon: Mail },
   { to: "/dashboard/blog", labelKey: "nav.blog", icon: BookOpen },
 ];
@@ -180,6 +181,13 @@ function DashboardLayout() {
   });
   const hasActivePlan = subData?.subscription?.status === "active";
 
+  // Parça Uzmanları programı flag+kriter kapısı: kapalıyken nav linki hiç
+  // görünmez (program yüzeyleri sunucu tarafında da kapalıdır).
+  const { data: expertAccess } = useExpertAccess(!!user);
+  const visibleMainMenuItems = mainMenuItems.filter(
+    (item) => item.to !== "/dashboard/uzmanlar" || expertAccess?.enabled === true,
+  );
+
   // Redirect unauthenticated users without mutating router state during render.
   useEffect(() => {
     if (!isLoading && !user) {
@@ -355,7 +363,7 @@ function DashboardLayout() {
     return (
       <>
         <NavSection title={t("nav.sectionMain")} collapsed={isCollapsed} />
-        {mainMenuItems.map((item) => (
+        {visibleMainMenuItems.map((item) => (
           <NavLink
             key={item.to}
             to={item.to}

apps/web/src/routes/dashboard/changelog.tsx

@@ -1,14 +0,0 @@
-import { ChangelogTab } from "@/components/settings/changelog-tab";
-import { createFileRoute } from "@tanstack/react-router";
-
-export const Route = createFileRoute("/dashboard/changelog")({
-  component: ChangelogPage,
-});
-
-function ChangelogPage() {
-  return (
-    <div className="mx-auto max-w-3xl">
-      <ChangelogTab />
-    </div>
-  );
-}

apps/web/src/routes/dashboard/oem.$code.tsx

@@ -1,3 +1,6 @@
+import { OemSuggestionsSection } from "@/components/catalog/oem-suggestions-section";
+import { OemVoteCard } from "@/components/catalog/oem-vote-card";
+import { useExpertAccess } from "@/hooks/use-expert-access";
 import { api } from "@/lib/api-client";
 import { capture } from "@/lib/posthog";
 import { Badge, Button, Input, Skeleton } from "@sase/ui";
@@ -114,11 +117,24 @@ function PartThumb({ src, alt }: { src: string | null; alt: string }) {
 // ─── Route ───────────────────────────────────────────────────────────────────
 
 export const Route = createFileRoute("/dashboard/oem/$code")({
+  // Katalogdan gelişte taşınan görüntü bağlamı: v = araç etiketi, p = parça
+  // adı (oy kartında "neyle neyin uyumlu olduğu" satırı), vid = vehicleId
+  // (oy kaydına analitik bağlam). Doğrudan ziyarette üçü de boş.
+  validateSearch: (search: Record<string, unknown>): { v?: string; p?: string; vid?: string } => ({
+    v: typeof search.v === "string" && search.v ? search.v : undefined,
+    p: typeof search.p === "string" && search.p ? search.p : undefined,
+    vid: typeof search.vid === "string" && search.vid ? search.vid : undefined,
+  }),
   component: OemDetailPage,
 });
 
 function OemDetailPage() {
   const { code } = Route.useParams();
+  const { v: vehicleLabel, p: partName, vid: vehicleId } = Route.useSearch();
+  // Parça Uzmanları programı kapısı — kapalıyken oy kartı ve öneri bölümü
+  // hiç render edilmez (cross-ref içeriği herkese açık kalır).
+  const { data: expertAccess } = useExpertAccess();
+  const expertEnabled = expertAccess?.enabled === true;
 
   const { data, isLoading, error } = useQuery({
     queryKey: ["p-oem", code],
@@ -169,28 +185,40 @@ function OemDetailPage() {
 
   return (
     <div className="mx-auto max-w-4xl space-y-6">
-      {/* ─── Header ─────────────────────────────────────────────────────── */}
-      <header className="flex items-start gap-4">
-        <Button asChild variant="ghost" size="icon" className="mt-0.5 shrink-0">
-          <Link to="/dashboard/search" aria-label="Geri">
-            <ArrowLeft className="size-5" />
-          </Link>
-        </Button>
-        <div className="min-w-0 flex-1">
-          <p className="text-xs font-medium uppercase tracking-wide text-muted-foreground">
-            OEM kodu
-          </p>
-          <div className="mt-1 flex flex-wrap items-center gap-3">
-            <h1 className="font-mono text-2xl font-bold tracking-tight break-all">{code}</h1>
-            <CopyCode
-              code={code}
-              className="rounded-md border border-border px-2 py-1 hover:bg-accent"
-            />
+      {/* ─── Header: solda OEM kodu, desktop'ta sağ simetriğinde topluluk
+           oyu kartı; mobilde kart kodun altına iner ─────────────────────── */}
+      <header className="flex flex-col gap-4 lg:flex-row lg:items-start lg:justify-between">
+        <div className="flex min-w-0 flex-1 items-start gap-4">
+          <Button asChild variant="ghost" size="icon" className="mt-0.5 shrink-0">
+            <Link to="/dashboard/search" aria-label="Geri">
+              <ArrowLeft className="size-5" />
+            </Link>
+          </Button>
+          <div className="min-w-0 flex-1">
+            <p className="text-xs font-medium uppercase tracking-wide text-muted-foreground">
+              OEM kodu
+            </p>
+            <div className="mt-1 flex flex-wrap items-center gap-3">
+              <h1 className="font-mono text-2xl font-bold tracking-tight break-all">{code}</h1>
+              <CopyCode
+                code={code}
+                className="rounded-md border border-border px-2 py-1 hover:bg-accent"
+              />
+            </div>
+            <p className="mt-1 text-sm text-muted-foreground">
+              Uyumlu parça kodları ve muadil numaralar
+            </p>
           </div>
-          <p className="mt-1 text-sm text-muted-foreground">
-            Uyumlu parça kodları ve muadil numaralar
-          </p>
         </div>
+        {expertEnabled && (
+          <OemVoteCard
+            oemCode={code}
+            vehicleLabel={vehicleLabel}
+            partName={partName}
+            vehicleId={vehicleId}
+            className="w-full lg:w-96 lg:shrink-0"
+          />
+        )}
       </header>
 
       {/* ─── Loading ────────────────────────────────────────────────────── */}
@@ -221,7 +249,8 @@ function OemDetailPage() {
           <p className="font-medium">Bu OEM kodu için uyumlu parça bulunamadı</p>
           <p className="max-w-md text-sm text-muted-foreground">
             Bağlantı parçaları, klipsler ve bazı orijinal kodların muadili henüz kataloğumuzda
-            olmayabilir. Katalog büyüdükçe eşleşme oranı artar.
+            olmayabilir. Katalog büyüdükçe eşleşme oranı artar. Muadilini biliyorsanız aşağıdan
+            önerin — diğer parça satıcılarına yol gösterir.
           </p>
         </div>
       )}
@@ -339,6 +368,9 @@ function OemDetailPage() {
         </div>
       )}
 
+      {/* ─── Topluluk muadil önerileri (eşleşme olmasa da toplanır) ──────── */}
+      {!isLoading && expertEnabled && <OemSuggestionsSection oemCode={code} />}
+
       {/* ─── Reverse catalog: your vehicles that use this code ───────────── */}
       {catalogVehicles && catalogVehicles.length > 0 && (
         <section className="space-y-3">

apps/web/src/routes/dashboard/uzmanlar.tsx

@@ -0,0 +1,199 @@
+import { LeaderboardPodium } from "@/components/gamification/leaderboard-podium";
+import {
+  type LeaderboardRankingItem,
+  LeaderboardRankings,
+} from "@/components/gamification/leaderboard-rankings";
+import { PointsBadge } from "@/components/gamification/points-badge";
+import { useExpertAccess } from "@/hooks/use-expert-access";
+import { api } from "@/lib/api-client";
+import { capture } from "@/lib/posthog";
+import { Card, CardContent, Skeleton } from "@sase/ui";
+import { useQuery } from "@tanstack/react-query";
+import { Link, createFileRoute } from "@tanstack/react-router";
+import { Medal, ThumbsUp, Trophy } from "lucide-react";
+import { useEffect } from "react";
+
+interface LeaderboardEntry {
+  rank: number;
+  name: string;
+  points: number;
+  votes: number;
+  isMe: boolean;
+}
+
+interface LeaderboardResponse {
+  entries: LeaderboardEntry[];
+  me: { rank: number | null; points: number; votes: number };
+  // İçinde bulunulan TR-ayı sezonunun başlangıcı (ISO) — sezon etiketi bundan üretilir.
+  periodStart?: string;
+}
+
+// Aylık ödül merdiveni (API'deki EXPERT_REWARD_LADDER ile aynı).
+const SEASON_PRIZES = [
+  { key: "r1", medal: "🥇", label: "1 ay üyelik" },
+  { key: "r2", medal: "🥈", label: "15 gün" },
+  { key: "r3", medal: "🥉", label: "7 gün" },
+] as const;
+
+function seasonLabel(periodStart?: string): string {
+  const date = periodStart ? new Date(periodStart) : new Date();
+  return new Intl.DateTimeFormat("tr-TR", {
+    month: "long",
+    year: "numeric",
+    timeZone: "Europe/Istanbul",
+  }).format(date);
+}
+
+export const Route = createFileRoute("/dashboard/uzmanlar")({
+  component: ExpertsPage,
+});
+
+const SKELETON_KEYS = ["s0", "s1", "s2", "s3", "s4", "s5"] as const;
+
+function ExpertsPage() {
+  // Program kapısı: flag + kullanım kriteri. Kapalıyken liderlik sorgusu hiç
+  // atılmaz, sayfa kademeli-açılış mesajı gösterir (nav linki de gizlidir;
+  // burası yalnız doğrudan URL ile gelenler için).
+  const { data: access, isLoading: accessLoading } = useExpertAccess();
+  const expertEnabled = access?.enabled === true;
+
+  const { data, isLoading } = useQuery({
+    queryKey: ["oem-leaderboard"],
+    queryFn: () => api.get<LeaderboardResponse>("/oem-votes/leaderboard"),
+    enabled: expertEnabled,
+  });
+
+  useEffect(() => {
+    capture("experts_leaderboard_viewed");
+  }, []);
+
+  if (!accessLoading && !expertEnabled) {
+    return (
+      <div className="mx-auto max-w-5xl">
+        <Card>
+          <CardContent className="flex flex-col items-center gap-3 py-16 text-center">
+            <Trophy className="size-10 text-muted-foreground/50" />
+            <p className="text-sm font-medium">
+              Parça Uzmanları programı kademeli olarak açılıyor.
+            </p>
+            <p className="max-w-md text-sm text-muted-foreground">
+              Program, kataloğu aktif kullanan üyelere otomatik açılır — şase sorgulamaya ve OEM
+              kodlarıyla çalışmaya devam edin, sıranız geldiğinde burada olacak.
+            </p>
+          </CardContent>
+        </Card>
+      </div>
+    );
+  }
+
+  const entries = data?.entries ?? [];
+  const me = data?.me;
+
+  // Liderlik cevabı kullanıcı id'si taşımaz; satır anahtarı sıradan türetilir.
+  const podiumRankings = entries.slice(0, 3).map((e) => ({
+    userId: `rank-${e.rank}`,
+    userName: e.name,
+    rank: e.rank,
+    value: e.points,
+  }));
+
+  const rankingItems: LeaderboardRankingItem[] = entries.map((e) => ({
+    userId: `rank-${e.rank}`,
+    userName: e.name,
+    rank: e.rank,
+    value: e.points,
+    byline: `${e.votes} oy`,
+    isCurrentUser: e.isMe,
+  }));
+
+  return (
+    <div className="mx-auto max-w-5xl space-y-6">
+      <div>
+        <h1 className="flex items-center gap-2 text-2xl font-bold">
+          <Trophy className="size-6 text-amber-400" />
+          Parça Uzmanları
+        </h1>
+        <p className="mt-1 text-sm text-muted-foreground">
+          OEM kodlarını oyla, puan topla, sıralamada yüksel — doğru bilgi bütün parça satıcılarının
+          işini hızlandırır.
+        </p>
+      </div>
+
+      {/* Sezon şeridi: ayın ilk 3 uzmanı üyelik kazanır */}
+      <div className="flex flex-wrap items-center gap-x-3 gap-y-2 rounded-xl border border-amber-400/30 bg-amber-400/5 px-4 py-3 text-sm">
+        <span className="font-semibold capitalize">{seasonLabel(data?.periodStart)} sezonu</span>
+        <span className="text-muted-foreground">ayın ilk 3 uzmanına üyelik:</span>
+        <span className="flex flex-wrap items-center gap-2">
+          {SEASON_PRIZES.map(({ key, medal, label }) => (
+            <span
+              key={key}
+              className="inline-flex items-center gap-1 rounded-full border border-border bg-background px-2.5 py-0.5 text-xs font-medium"
+            >
+              <span aria-hidden="true">{medal}</span>
+              {label}
+            </span>
+          ))}
+        </span>
+      </div>
+
+      {isLoading || accessLoading ? (
+        <div className="space-y-3">
+          {SKELETON_KEYS.map((k) => (
+            <Skeleton key={k} className="h-14 w-full" />
+          ))}
+        </div>
+      ) : entries.length === 0 ? (
+        <Card>
+          <CardContent className="flex flex-col items-center gap-3 py-12 text-center">
+            <Trophy className="size-10 text-muted-foreground/50" />
+            <p className="text-sm font-medium">Sıralama henüz boş.</p>
+            <p className="max-w-md text-sm text-muted-foreground">
+              İlk uzman siz olun: katalogdan bir OEM kodunu değerlendirin, açılış puanlarını siz
+              kapın.
+            </p>
+            <Link to="/dashboard/search" className="text-sm font-semibold text-primary underline">
+              Şase sorgula ve oylamaya başla
+            </Link>
+          </CardContent>
+        </Card>
+      ) : (
+        <>
+          {/* Kendi durumum */}
+          {me && (
+            <div className="grid gap-3 sm:grid-cols-3">
+              <PointsBadge name="puanınız" total={me.points} />
+              <PointsBadge
+                name="sıralamanız"
+                total={me.rank ?? 0}
+                icon={Medal}
+                formatValue={(v) => (v > 0 ? `#${v}` : "—")}
+              />
+              <PointsBadge name="oyunuz" total={me.votes} icon={ThumbsUp} />
+            </div>
+          )}
+
+          {/* İlk 3 kürsüsü */}
+          {podiumRankings.length > 0 && (
+            <Card>
+              <CardContent className="pt-6">
+                <LeaderboardPodium rankings={podiumRankings} />
+              </CardContent>
+            </Card>
+          )}
+
+          {/* Tam sıralama */}
+          <LeaderboardRankings rankings={rankingItems} showPagination={entries.length > 25} />
+        </>
+      )}
+
+      {/* Puan kuralları yalnız burada yaşar — küçük punto (computeVoteAward ile aynı kural). */}
+      <p className="pt-2 text-center text-[11px] leading-relaxed text-muted-foreground/70">
+        Oy ver <span className="font-semibold text-muted-foreground">+1</span> · çoğunluğu tuttur{" "}
+        <span className="font-semibold text-muted-foreground">+2 bonus</span> · kodu ilk
+        değerlendiren <span className="font-semibold text-muted-foreground">3 puanı</span> kapar ·
+        sıralama her ayın 1'i 00:00'da sıfırlanır, biten ayın ilk 3'üne üyelik uzatması otomatik
+        tanımlanır
+      </p>
+    </div>
+  );
+}