9d037dc2c2
Introduces the session_branches table to represent diagnostic hypothesis paths within a FlowPilot session, supporting parent/child branch relationships, status lifecycle, and per-branch conversation history. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
59 lines
3.9 KiB
Python
59 lines
3.9 KiB
Python
"""Session branch model — represents a diagnostic hypothesis path within a FlowPilot session."""
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import uuid
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from datetime import datetime, timezone
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from typing import Optional, Any, TYPE_CHECKING
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from sqlalchemy import String, Text, DateTime, ForeignKey, Integer, CheckConstraint, Index
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from sqlalchemy.orm import Mapped, mapped_column, relationship
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from sqlalchemy.dialects.postgresql import UUID, JSONB
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from app.core.database import Base
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if TYPE_CHECKING:
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from app.models.ai_session import AISession
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from app.models.ai_session_step import AISessionStep
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from app.models.user import User
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class SessionBranch(Base):
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"""A diagnostic branch within a FlowPilot session."""
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__tablename__ = "session_branches"
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__table_args__ = (
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CheckConstraint(
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"status IN ('active', 'dead_end', 'solved', 'untried', 'revived')",
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name="ck_session_branches_status",
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),
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CheckConstraint(
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"branch_order > 0",
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name="ck_session_branches_branch_order_positive",
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),
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Index("ix_session_branches_session_id", "session_id"),
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Index("ix_session_branches_parent_branch_id", "parent_branch_id"),
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Index("ix_session_branches_session_status", "session_id", "status"),
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Index("ix_session_branches_session_order", "session_id", "branch_order"),
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)
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id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
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session_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("ai_sessions.id", ondelete="CASCADE"), nullable=False)
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parent_branch_id: Mapped[Optional[uuid.UUID]] = mapped_column(UUID(as_uuid=True), ForeignKey("session_branches.id", ondelete="CASCADE"), nullable=True)
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fork_point_step_id: Mapped[Optional[uuid.UUID]] = mapped_column(UUID(as_uuid=True), ForeignKey("ai_session_steps.id", ondelete="SET NULL"), nullable=True)
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branch_order: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
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label: Mapped[str] = mapped_column(String(200), nullable=False)
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status: Mapped[str] = mapped_column(String(20), nullable=False, default="active")
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status_reason: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
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status_changed_at: Mapped[Optional[datetime]] = mapped_column(DateTime(timezone=True), nullable=True)
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status_changed_by: Mapped[Optional[uuid.UUID]] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True)
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conversation_messages: Mapped[list[dict[str, Any]]] = mapped_column(JSONB, nullable=False, default=list, comment="LLM message history scoped to this branch")
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context_summary: Mapped[Optional[dict[str, Any]]] = mapped_column(JSONB, nullable=True, comment="{tried: [], concluded: str, artifacts: []}")
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evidence_from_branch_id: Mapped[Optional[uuid.UUID]] = mapped_column(UUID(as_uuid=True), ForeignKey("session_branches.id", ondelete="SET NULL"), nullable=True)
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evidence_description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
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created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))
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updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
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# Relationships
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session: Mapped["AISession"] = relationship("AISession", foreign_keys=[session_id])
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parent_branch: Mapped[Optional["SessionBranch"]] = relationship("SessionBranch", remote_side="SessionBranch.id", foreign_keys=[parent_branch_id])
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fork_point_step: Mapped[Optional["AISessionStep"]] = relationship("AISessionStep", foreign_keys=[fork_point_step_id])
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status_changed_by_user: Mapped[Optional["User"]] = relationship("User", foreign_keys=[status_changed_by])
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evidence_source: Mapped[Optional["SessionBranch"]] = relationship("SessionBranch", remote_side="SessionBranch.id", foreign_keys=[evidence_from_branch_id])
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