新增PDF生成并发设置

backend/app/models/__init__.py

@@ -3,6 +3,7 @@ from app.models.certificate import Certificate, CertificateAccessToken, ProjectC
 from app.models.import_batch import ImportBatch, ImportBatchRow
 from app.models.learner import Learner, LearnerNameHistory, LearnerPhoneHistory
 from app.models.log import OperationLog
+from app.models.setting import SystemSetting
 
 __all__ = [
     "AdminUser",
@@ -16,4 +17,5 @@ __all__ = [
     "OperationLog",
     "ProjectCourse",
     "Role",
+    "SystemSetting",
 ]

backend/app/models/setting.py

@@ -0,0 +1,15 @@
+from datetime import datetime
+
+from sqlalchemy import DateTime, String, Text
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db.base import Base
+
+
+class SystemSetting(Base):
+    __tablename__ = "system_settings"
+
+    key: Mapped[str] = mapped_column(String(128), primary_key=True)
+    value: Mapped[str] = mapped_column(Text)
+    description: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)