46 lines
1.6 KiB
Python
46 lines
1.6 KiB
Python
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import uuid
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from sqlalchemy import ForeignKey, Text, UniqueConstraint
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from sqlalchemy.dialects.postgresql import UUID
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from sqlalchemy.orm import Mapped, mapped_column, relationship
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from api.models.base import Base, TimestampMixin, new_uuid
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class WorkstreamDependency(Base, TimestampMixin):
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"""Directed dependency edge: `from_workstream` depends on `to_workstream`.
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Semantics: `to_workstream` must reach a satisfactory state before
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`from_workstream` can fully proceed. Hard deletes are intentional —
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removing an edge removes a constraint, not information.
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"""
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__tablename__ = "workstream_dependencies"
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__table_args__ = (
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UniqueConstraint("from_workstream_id", "to_workstream_id", name="uq_ws_dep_pair"),
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)
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id: Mapped[uuid.UUID] = mapped_column(
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UUID(as_uuid=True), primary_key=True, default=new_uuid
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)
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from_workstream_id: Mapped[uuid.UUID] = mapped_column(
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UUID(as_uuid=True),
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ForeignKey("workstreams.id", ondelete="CASCADE"),
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nullable=False,
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index=True,
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)
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to_workstream_id: Mapped[uuid.UUID] = mapped_column(
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UUID(as_uuid=True),
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ForeignKey("workstreams.id", ondelete="CASCADE"),
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nullable=False,
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index=True,
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)
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description: Mapped[str | None] = mapped_column(Text, nullable=True)
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from_workstream: Mapped["Workstream"] = relationship( # noqa: F821
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"Workstream", foreign_keys=[from_workstream_id]
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)
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to_workstream: Mapped["Workstream"] = relationship( # noqa: F821
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"Workstream", foreign_keys=[to_workstream_id]
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)
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