Add workplan execution queue

api/models/workplan_launch_request.py

@@ -0,0 +1,39 @@
+import uuid
+
+from sqlalchemy import Boolean, ForeignKey, String, Text
+from sqlalchemy.dialects.postgresql import JSONB, UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from api.models.base import Base, TimestampMixin, new_uuid
+
+
+class WorkplanLaunchRequest(Base, TimestampMixin):
+    __tablename__ = "workplan_launch_requests"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=new_uuid
+    )
+    workstream_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("workstreams.id", ondelete="CASCADE"),
+        nullable=False,
+        index=True,
+    )
+    requested_by: Mapped[str] = mapped_column(String(100), nullable=False, default="dashboard")
+    requested_actor: Mapped[str | None] = mapped_column(String(100), nullable=True)
+    launch_mode: Mapped[str] = mapped_column(String(20), nullable=False, default="queued", index=True)
+    concurrency_mode: Mapped[str] = mapped_column(String(20), nullable=False, default="sequential", index=True)
+    priority: Mapped[str | None] = mapped_column(String(20), nullable=True, index=True)
+    repo_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True),
+        ForeignKey("managed_repos.id", ondelete="SET NULL"),
+        nullable=True,
+        index=True,
+    )
+    branch_preference: Mapped[str | None] = mapped_column(Text, nullable=True)
+    immediate_pickup: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default="false")
+    status: Mapped[str] = mapped_column(String(20), nullable=False, default="requested", server_default="requested", index=True)
+    notes: Mapped[str | None] = mapped_column(Text, nullable=True)
+    request_metadata: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict, server_default="{}")
+
+    workstream: Mapped["Workstream"] = relationship("Workstream", back_populates="launch_requests")  # noqa: F821