basic workspace model and repository implementation

atst/models/__init__.py

@@ -10,3 +10,4 @@ from .user import User
 from .workspace_role import WorkspaceRole
 from .pe_number import PENumber
 from .task_order import TaskOrder
+from .workspace import Workspace

atst/models/workspace.py

@@ -0,0 +1,19 @@
+from sqlalchemy import Column, ForeignKey, String
+from sqlalchemy.orm import relationship
+
+from atst.models import Base
+from atst.models.types import Id
+
+
+class Workspace(Base):
+    __tablename__ = "workspaces"
+
+    id = Id()
+
+    request_id = Column(ForeignKey("requests.id"), nullable=False)
+    request = relationship("Request")
+
+    task_order_id = Column(ForeignKey("task_order.id"), nullable=False)
+    task_order = relationship("TaskOrder")
+
+    name = Column(String, unique=True)