feat(workbench): persist topbar notification state

server/src/app/models/notification_state.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+import uuid
+from datetime import datetime
+from typing import Any
+
+from sqlalchemy import DateTime, Index, String, UniqueConstraint, func
+from sqlalchemy.orm import Mapped, mapped_column
+from sqlalchemy.types import JSON
+
+from app.db.base_class import Base
+
+
+class NotificationState(Base):
+    __tablename__ = "notification_states"
+    __table_args__ = (
+        UniqueConstraint("user_id", "notification_id", name="uq_notification_states_user_notification"),
+        Index("ix_notification_states_user_updated", "user_id", "updated_at"),
+    )
+
+    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
+    user_id: Mapped[str] = mapped_column(String(100), index=True)
+    notification_id: Mapped[str] = mapped_column(String(180), index=True)
+    read_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    hidden_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
+    context_json: Mapped[dict[str, Any]] = mapped_column(JSON, default=dict)
+    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True),
+        server_default=func.now(),
+        onupdate=func.now(),
+    )