93 lines
3.9 KiB
Python
93 lines
3.9 KiB
Python
"""Flow engine domain models (SQLModel tables)."""
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from datetime import datetime, timezone
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from uuid import UUID, uuid4
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from sqlalchemy import JSON, Column, DateTime, UniqueConstraint
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from sqlmodel import Field, SQLModel
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def utcnow() -> datetime:
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return datetime.now(timezone.utc)
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def _ts_column() -> Column:
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return Column(DateTime(timezone=True))
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def _json_column() -> Column:
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# Generic JSON: JSONB on Postgres, JSON/TEXT elsewhere.
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return Column(JSON)
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class FlowDefinition(SQLModel, table=True):
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"""A named decision flow (e.g. 'Bauvorhaben pruefen'). Versions live separately."""
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__tablename__ = "flow_definitions"
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id: UUID = Field(default_factory=uuid4, primary_key=True)
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name: str = Field(index=True, unique=True, max_length=200)
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description: str = Field(default="", max_length=2000)
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status: str = Field(default="active", max_length=20) # active | archived
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# Filename under backend/flows/ this definition is synced from
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# (e.g. "simple_rule.json"). None for definitions created via the API.
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source_path: str | None = Field(default=None, max_length=255)
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# Flow to run after a human approval on this flow's runs (nullable).
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continuation_flow_id: UUID | None = Field(
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default=None, foreign_key="flow_definitions.id"
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)
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created_at: datetime = Field(default_factory=utcnow, sa_column=_ts_column())
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class FlowVersion(SQLModel, table=True):
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"""An immutable version of a flow: the exact Langflow JSON that runs."""
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__tablename__ = "flow_versions"
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__table_args__ = (UniqueConstraint("flow_id", "version_no"),)
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id: UUID = Field(default_factory=uuid4, primary_key=True)
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flow_id: UUID = Field(foreign_key="flow_definitions.id", index=True)
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version_no: int = Field(index=True)
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langflow_json: dict = Field(default_factory=dict, sa_column=_json_column())
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# Flow id under which LFX serves this version (set on deploy).
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lfx_flow_id: str | None = Field(default=None, max_length=200)
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deployed_at: datetime | None = Field(default=None, sa_column=_ts_column())
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author: str = Field(default="", max_length=200)
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created_at: datetime = Field(default_factory=utcnow, sa_column=_ts_column())
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class FlowRun(SQLModel, table=True):
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"""One execution of a flow version."""
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__tablename__ = "flow_runs"
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id: UUID = Field(default_factory=uuid4, primary_key=True)
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version_id: UUID = Field(foreign_key="flow_versions.id", index=True)
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tenant_id: str = Field(default="default", index=True, max_length=200)
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# running | completed | pending_approval | failed
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status: str = Field(default="running", index=True, max_length=30)
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input: dict | None = Field(default=None, sa_column=_json_column())
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output: dict | None = Field(default=None, sa_column=_json_column())
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session_id: str | None = Field(default=None, max_length=200)
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created_at: datetime = Field(default_factory=utcnow, sa_column=_ts_column())
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finished_at: datetime | None = Field(default=None, sa_column=_ts_column())
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class ApprovalTask(SQLModel, table=True):
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"""Human task created by a flow that reached a terminal approval state."""
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__tablename__ = "approval_tasks"
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id: UUID = Field(default_factory=uuid4, primary_key=True)
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run_id: UUID = Field(foreign_key="flow_runs.id", index=True)
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version_id: UUID = Field(foreign_key="flow_versions.id", index=True)
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tenant_id: str = Field(default="default", index=True, max_length=200)
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title: str = Field(default="", max_length=500)
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payload: dict = Field(default_factory=dict, sa_column=_json_column())
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continuation_flow_id: UUID | None = Field(default=None)
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approver: str | None = Field(default=None, max_length=200)
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# open | approved | rejected
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status: str = Field(default="open", index=True, max_length=20)
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decision_note: str = Field(default="", max_length=2000)
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created_at: datetime = Field(default_factory=utcnow, sa_column=_ts_column())
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decided_at: datetime | None = Field(default=None, sa_column=_ts_column())
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