Add PostgreSQL-backed background worker

apps/web/drizzle/0029_background_jobs.sql

@@ -0,0 +1,21 @@
+CREATE TABLE IF NOT EXISTS "beenvoice_background_job" (
+	"id" varchar(255) PRIMARY KEY NOT NULL,
+	"type" varchar(100) NOT NULL,
+	"payload" jsonb DEFAULT '{}'::jsonb NOT NULL,
+	"status" varchar(20) DEFAULT 'pending' NOT NULL,
+	"idempotencyKey" varchar(500) NOT NULL,
+	"runAt" timestamp DEFAULT now() NOT NULL,
+	"attempts" integer DEFAULT 0 NOT NULL,
+	"maxAttempts" integer DEFAULT 5 NOT NULL,
+	"lockedAt" timestamp,
+	"lockedBy" varchar(255),
+	"lastError" text,
+	"completedAt" timestamp,
+	"createdAt" timestamp DEFAULT now() NOT NULL,
+	"updatedAt" timestamp DEFAULT now() NOT NULL,
+	CONSTRAINT "beenvoice_background_job_idempotencyKey_unique" UNIQUE("idempotencyKey")
+);
+--> statement-breakpoint
+CREATE INDEX IF NOT EXISTS "background_job_status_run_at_idx" ON "beenvoice_background_job" USING btree ("status", "runAt");
+--> statement-breakpoint
+CREATE INDEX IF NOT EXISTS "background_job_type_status_idx" ON "beenvoice_background_job" USING btree ("type", "status");

apps/web/drizzle/meta/_journal.json

@@ -204,6 +204,13 @@
       "when": 1786766968000,
       "tag": "0028_enable_public_demo_password",
       "breakpoints": true
+    },
+    {
+      "idx": 29,
+      "version": "7",
+      "when": 1786941568000,
+      "tag": "0029_background_jobs",
+      "breakpoints": true
     }
   ]
 }