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feat(l1): FlowProposal l1_session_id source linkage (nullable source_session_id + exactly-one check)

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Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Michael Chihlas
2026-05-29 15:34:05 -04:00
parent 9a5cbc35ae
commit 0796874376
5 changed files with 113 additions and 7 deletions
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31
backend/app/models/flow_proposal.py
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@@ -19,6 +19,7 @@ if TYPE_CHECKING:
from app.models.account import Account
from app.models.tree import Tree
from app.models.ai_session import AISession
from app.models.l1_walk_session import L1WalkSession
class FlowProposal(Base):
@@ -56,6 +57,10 @@ class FlowProposal(Base):
"linked_ticket_kind IS NULL OR linked_ticket_kind IN ('psa', 'internal')",
name="ck_flow_proposals_linked_ticket_kind",
),
CheckConstraint(
"(source_session_id IS NOT NULL) <> (l1_session_id IS NOT NULL)",
name="ck_flow_proposals_exactly_one_source",
),
)
id: Mapped[uuid.UUID] = mapped_column(
@@ -73,10 +78,16 @@ class FlowProposal(Base):
nullable=True,
index=True,
)
source_session_id: Mapped[uuid.UUID] = mapped_column(
source_session_id: Mapped[Optional[uuid.UUID]] = mapped_column(
UUID(as_uuid=True),
ForeignKey("ai_sessions.id", ondelete="CASCADE"),
nullable=False,
nullable=True,
index=True,
)
l1_session_id: Mapped[Optional[uuid.UUID]] = mapped_column(
UUID(as_uuid=True),
ForeignKey("l1_walk_sessions.id", ondelete="SET NULL"),
nullable=True,
index=True,
)
@@ -164,7 +175,17 @@ class FlowProposal(Base):
# ── Relationships ──
account: Mapped["Account"] = relationship("Account")
team: Mapped[Optional["Team"]] = relationship("Team")
source_session: Mapped["AISession"] = relationship("AISession")
target_flow: Mapped[Optional["Tree"]] = relationship("Tree", foreign_keys=[target_flow_id])
published_flow: Mapped[Optional["Tree"]] = relationship("Tree", foreign_keys=[published_flow_id])
source_session: Mapped[Optional["AISession"]] = relationship("AISession")
# Two FK paths exist between FlowProposal and L1WalkSession
# (FlowProposal.l1_session_id here, L1WalkSession.flow_proposal_id there),
# so each relationship must name its foreign_keys explicitly.
l1_session: Mapped[Optional["L1WalkSession"]] = relationship(
"L1WalkSession", foreign_keys="[FlowProposal.l1_session_id]"
)
target_flow: Mapped[Optional["Tree"]] = relationship(
"Tree", foreign_keys=[target_flow_id]
)
published_flow: Mapped[Optional["Tree"]] = relationship(
"Tree", foreign_keys=[published_flow_id]
)
reviewer: Mapped[Optional["User"]] = relationship("User")