add db migrations

models/script.py

@@ -0,0 +1,57 @@
+from datetime import datetime
+from sqlalchemy.orm import Mapped, mapped_column
+from sqlalchemy import String, Text, Integer, DateTime, Index, func
+from models.base import Base
+
+
+class Script(Base):
+    __tablename__ = "t_script"
+
+    id: Mapped[int] = mapped_column(
+        Integer,
+        primary_key=True,
+        autoincrement=True,
+        comment="自动递增的唯一内容ID"
+    )
+
+    project: Mapped[str] = mapped_column(
+        String(64),
+        nullable=False,
+        index=True,
+        comment="项目名称"
+    )
+
+    subject: Mapped[str] = mapped_column(
+        String(256),
+        nullable=False,
+        comment="主题"
+    )
+
+    content: Mapped[str | None] = mapped_column(
+        Text,
+        nullable=True,
+        comment="内容"
+    )
+
+    create_time: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        nullable=False,
+        comment="创建时间"
+    )
+
+    update_time: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        onupdate=func.now(),
+        nullable=False,
+        comment="更新时间"
+    )
+
+    # ——可选优化：添加 项目 + 主题 联合唯一索引——
+    __table_args__ = (
+        Index("ux_project_subject", "project", "subject", unique=True),
+    )
+
+    def __repr__(self):
+        return f"<Script id={self.id} project={self.project!r} subject={self.subject!r}>"