feat(jobs): 增加后台任务运行时

apps/server/prisma/migrations/20260708040000_v26_background_jobs/migration.sql

@@ -0,0 +1,32 @@
+CREATE TABLE "background_jobs" (
+    "id" TEXT NOT NULL,
+    "type" TEXT NOT NULL,
+    "status" TEXT NOT NULL DEFAULT 'queued',
+    "dedupe_key" TEXT,
+    "payload" JSONB NOT NULL DEFAULT '{}',
+    "attempts" INTEGER NOT NULL DEFAULT 0,
+    "max_attempts" INTEGER NOT NULL DEFAULT 3,
+    "available_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "locked_by" TEXT,
+    "locked_until" TIMESTAMP(3),
+    "last_error" TEXT,
+    "completed_at" TIMESTAMP(3),
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updated_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "background_jobs_pkey" PRIMARY KEY ("id")
+);
+
+CREATE INDEX "background_jobs_status_available_at_idx"
+  ON "background_jobs"("status", "available_at" ASC, "created_at" ASC);
+
+CREATE INDEX "background_jobs_type_status_available_at_idx"
+  ON "background_jobs"("type", "status", "available_at" ASC);
+
+CREATE INDEX "background_jobs_lease_idx"
+  ON "background_jobs"("status", "locked_until" ASC)
+  WHERE "locked_until" IS NOT NULL;
+
+CREATE UNIQUE INDEX "background_jobs_active_dedupe_key_idx"
+  ON "background_jobs"("type", "dedupe_key")
+  WHERE "dedupe_key" IS NOT NULL AND "status" IN ('queued', 'running');

apps/server/prisma/schema.prisma

@@ -423,6 +423,25 @@ model AiLog {
   @@map("ai_logs")
 }
 
+model BackgroundJob {
+  id          String   @id @default(cuid())
+  type        String
+  status      String   @default("queued")
+  dedupeKey   String?  @map("dedupe_key")
+  payload     Json     @default("{}")
+  attempts    Int      @default(0)
+  maxAttempts Int      @default(3) @map("max_attempts")
+  availableAt DateTime @default(now()) @map("available_at")
+  lockedBy    String?  @map("locked_by")
+  lockedUntil DateTime? @map("locked_until")
+  lastError   String?  @map("last_error")
+  completedAt DateTime? @map("completed_at")
+  createdAt   DateTime @default(now()) @map("created_at")
+  updatedAt   DateTime @updatedAt @map("updated_at")
+
+  @@map("background_jobs")
+}
+
 model XiaobaoRiskSummary {
   versionId           String   @id @map("version_id")
   riskLevel           String   @map("risk_level")