"""ORM 模型: leagues / teams / matches / match_stats / standings / predictions。

数据源统一为 bzzoiro(单一数据源),伤停(injuries)与 Understat 已移除。
"""
from __future__ import annotations

from datetime import date, datetime, timezone

from sqlalchemy import (
    BigInteger,
    Boolean,
    CheckConstraint,
    Date,
    DateTime,
    Float,
    ForeignKey,
    Index,
    Integer,
    String,
    Text,
    UniqueConstraint,
    column,
    func,
)
from sqlalchemy.dialects.postgresql import JSONB
from sqlalchemy.orm import Mapped, mapped_column, relationship

from src.db.base import Base


def _utcnow() -> datetime:
    return datetime.now(timezone.utc)


class League(Base):
    __tablename__ = "leagues"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    code: Mapped[str] = mapped_column(String(20), unique=True, nullable=False)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    country: Mapped[str | None] = mapped_column(String(50))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow)

    matches: Mapped[list["Match"]] = relationship(back_populates="league")


class Team(Base):
    __tablename__ = "teams"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    name: Mapped[str] = mapped_column(String(120), unique=True, nullable=False)
    name_zh: Mapped[str | None] = mapped_column(String(60))
    team_type: Mapped[str] = mapped_column(String(20), default="club")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow)

    home_matches: Mapped[list["Match"]] = relationship(foreign_keys="Match.home_team_id", back_populates="home_team")
    away_matches: Mapped[list["Match"]] = relationship(foreign_keys="Match.away_team_id", back_populates="away_team")


class TeamAlias(Base):
    """球队别名:同一球队的不同写法(大小写/译名/缩写)映射到归一后的 teams.id。

    入库流程(get_or_create):normalize(name) → 查 teams.name → 查 team_aliases
    → 都没有再 insert 新 Team。别名不自动合并历史重复队,需显式添加。
    alias_normalized 为 normalize(别名)后的稳定幂等键,用作 PK 避免重复插入。
    """
    __tablename__ = "team_aliases"

    # normalize(别名)后的值,稳定幂等,用作主键
    alias_normalized: Mapped[str] = mapped_column(String(120), primary_key=True)
    team_id: Mapped[int] = mapped_column(ForeignKey("teams.id", ondelete="CASCADE"), nullable=False)
    original_alias: Mapped[str] = mapped_column(String(120), nullable=False)  # 原始写法(保留供参考)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow)


class Match(Base):
    __tablename__ = "matches"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    league_id: Mapped[int] = mapped_column(ForeignKey("leagues.id"), nullable=False)
    season: Mapped[str | None] = mapped_column(String(12))
    home_team_id: Mapped[int] = mapped_column(ForeignKey("teams.id"), nullable=False)
    away_team_id: Mapped[int] = mapped_column(ForeignKey("teams.id"), nullable=False)
    match_date: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
    match_date_date: Mapped[date] = mapped_column(
        "match_date_date",
        Date,
        nullable=False,
        index=True,
    )
    match_status: Mapped[str] = mapped_column(String(20), default="scheduled")
    # P0-01:比分可信度标记。known=有可靠比分;missing=完赛但缺分(保留 NULL 不伪造 0:0);
    # unknown=待定(无比分且未确认完赛)。禁止把缺分写成 0:0。
    score_status: Mapped[str] = mapped_column(String(20), server_default="unknown", nullable=False)
    home_goals: Mapped[int | None] = mapped_column(Integer)
    away_goals: Mapped[int | None] = mapped_column(Integer)
    home_ht_goals: Mapped[int | None] = mapped_column(Integer)
    away_ht_goals: Mapped[int | None] = mapped_column(Integer)
    match_stage: Mapped[str | None] = mapped_column(String(100))
    # 数据血缘:bzzoiro 上游事件 ID,用于 /events/{id}/stats/ 统计回填
    source_event_id: Mapped[int | None] = mapped_column(BigInteger, index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow, onupdate=_utcnow)

    league: Mapped[League] = relationship(back_populates="matches", lazy="selectin")
    # lazy="selectin": 这些关系在业务里几乎总是一起读取(切片/回测/展示)。
    # 默认的 lazy="select" 在 async SQLAlchemy 下,于 session 之外或未显式
    # eager-load 时访问会抛 MissingGreenlet —— 已因此导致 form/stats/h2h
    # 三个专家切片静默失败。统一改为预加载,从根上消除这类问题。
    home_team: Mapped[Team] = relationship(
        foreign_keys=[home_team_id], back_populates="home_matches", lazy="selectin"
    )
    away_team: Mapped[Team] = relationship(
        foreign_keys=[away_team_id], back_populates="away_matches", lazy="selectin"
    )
    stats: Mapped["MatchStats | None"] = relationship(
        back_populates="match", cascade="all, delete-orphan", lazy="select"
    )
    predictions: Mapped[list["Prediction"]] = relationship(back_populates="match", cascade="all, delete-orphan")

    __table_args__ = (
        Index("ix_matches_league_date", "league_id", match_date.desc()),
        Index("ix_matches_home_date", "home_team_id", match_date.desc()),
        Index("ix_matches_away_date", "away_team_id", match_date.desc()),
        Index("ix_matches_status_date", "match_status", match_date.desc()),
        Index(
            "ix_matches_unique",
            "league_id",
            "home_team_id",
            "away_team_id",
            "match_date_date",
            unique=True,
        ),
        # P0-01:比分可信度约束(替代原 ck_matches_finished_has_score):
        #   - score_status=known → 必须有比分(非 NULL)
        #   - score_status=missing → 必须 NULL(完赛缺分,禁止伪造 0:0)
        #   - score_status=unknown → 必须 NULL
        CheckConstraint(
            "score_status IN ('known', 'missing', 'unknown')",
            name="ck_matches_score_status_enum",
        ),
        CheckConstraint(
            "match_status <> 'finished'"
            " OR (score_status = 'known' AND home_goals IS NOT NULL AND away_goals IS NOT NULL)"
            " OR (score_status IN ('missing', 'unknown') AND home_goals IS NULL AND away_goals IS NULL)",
            name="ck_matches_score_integrity",
        ),
        CheckConstraint(
            "match_status IN ('finished', 'scheduled', 'in_play', 'paused', 'postponed', 'cancelled', 'suspended')",
            name="ck_matches_status_enum",
        ),
        # 半场进球 ≤ 全场进球
        CheckConstraint(
            "home_ht_goals IS NULL OR home_goals IS NULL OR home_ht_goals <= home_goals",
            name="ck_matches_home_ht_le_full",
        ),
        CheckConstraint(
            "away_ht_goals IS NULL OR away_goals IS NULL OR away_ht_goals <= away_goals",
            name="ck_matches_away_ht_le_full",
        ),
    )


class MatchStats(Base):
    __tablename__ = "match_stats"

    match_id: Mapped[int] = mapped_column(ForeignKey("matches.id", ondelete="CASCADE"), primary_key=True)
    home_xg: Mapped[float | None] = mapped_column(Float)
    away_xg: Mapped[float | None] = mapped_column(Float)
    home_shots: Mapped[int | None] = mapped_column(Integer)
    away_shots: Mapped[int | None] = mapped_column(Integer)
    home_shots_on_target: Mapped[int | None] = mapped_column(Integer)
    away_shots_on_target: Mapped[int | None] = mapped_column(Integer)
    home_corners: Mapped[int | None] = mapped_column(Integer)
    away_corners: Mapped[int | None] = mapped_column(Integer)
    home_possession: Mapped[float | None] = mapped_column(Float)
    home_yellow_cards: Mapped[int | None] = mapped_column(Integer)
    away_yellow_cards: Mapped[int | None] = mapped_column(Integer)
    home_red_cards: Mapped[int | None] = mapped_column(Integer)
    away_red_cards: Mapped[int | None] = mapped_column(Integer)
    # bzzoiro /events/{id}/stats/ 扩展字段
    home_big_chances: Mapped[int | None] = mapped_column(Integer)
    away_big_chances: Mapped[int | None] = mapped_column(Integer)
    home_fouls: Mapped[int | None] = mapped_column(Integer)
    away_fouls: Mapped[int | None] = mapped_column(Integer)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow, onupdate=_utcnow)
    # 数据血缘:追踪统计数据的来源和可用时间
    source: Mapped[str | None] = mapped_column(String(30))  # bzzoiro / understat
    source_record_id: Mapped[str | None] = mapped_column(String(100))
    retrieved_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    available_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    # xG 数据血缘:单独追踪 xG 字段的来源与更新时间(xG 可能独立于其他统计被更新)
    xg_source: Mapped[str | None] = mapped_column(String(30))
    xg_updated_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    xg_source_record_id: Mapped[str | None] = mapped_column(String(100))

    match: Mapped[Match] = relationship(back_populates="stats")

    __table_args__ = (
        # 数据血缘时间过滤查询用(按 available_at 取「赛前已可得」的统计)
        Index("ix_match_stats_available_at", "available_at"),
    )


class Standing(Base):
    """联赛积分榜快照(bzzoiro /leagues/{id}/standings/)。

    P0-02: 改为追加快照(append-only)。每次采集 INSERT 新行,available_at=now;
    查询取 available_at<=cutoff 的每队最新快照(DISTINCT ON team_id ORDER available_at DESC)。
    回测时可还原任意历史时刻的榜单,不再只是"最新快照、忽略 cutoff"。
    同一 (league_id, season, team_id, available_at) 唯一,ON CONFLICT DO NOTHING。
    zone 来自 bzzoiro 分区(如 champions_league / europa_league / relegation)。
    """
    __tablename__ = "standings"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    league_id: Mapped[int] = mapped_column(ForeignKey("leagues.id"), nullable=False)
    season: Mapped[str] = mapped_column(String(12), nullable=False)
    team_id: Mapped[int] = mapped_column(ForeignKey("teams.id"), nullable=False)
    position: Mapped[int] = mapped_column(Integer, nullable=False)
    played: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    won: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    drawn: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    lost: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    goals_for: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    goals_against: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    goal_diff: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    points: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
    xg_for: Mapped[float | None] = mapped_column(Float)
    xg_against: Mapped[float | None] = mapped_column(Float)
    form: Mapped[str | None] = mapped_column(String(20))  # 近期赛果串,如 "WWDLW"
    zone: Mapped[str | None] = mapped_column(String(50))  # champions_league / relegation 等
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow, onupdate=_utcnow)
    retrieved_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow)
    # P0-02: 快照可用时间(采集时间),唯一键组成部分 + cutoff 过滤依据
    available_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False, default=_utcnow)

    league: Mapped[League] = relationship()
    team: Mapped[Team] = relationship(lazy="selectin")

    __table_args__ = (
        # P0-02: (league, season, team, available_at) 唯一,支持追加快照 + ON CONFLICT DO NOTHING
        UniqueConstraint("league_id", "season", "team_id", "available_at", name="uq_standings_league_season_team_available"),
        Index("ix_standings_league_season_pos", "league_id", "season", "position"),
        Index("ix_standings_league_season_team_available", "league_id", "season", "team_id", "available_at"),
    )


class Prediction(Base):
    __tablename__ = "predictions"

    id: Mapped[int] = mapped_column(Integer, primary_key=True)
    match_id: Mapped[int] = mapped_column(ForeignKey("matches.id", ondelete="CASCADE"), nullable=False)
    provider: Mapped[str] = mapped_column(String(30), nullable=False)
    model: Mapped[str] = mapped_column(String(80), nullable=False)
    prompt_version: Mapped[str] = mapped_column(String(20), nullable=False, default="v1")
    prompt_tokens: Mapped[int | None] = mapped_column(Integer)
    completion_tokens: Mapped[int | None] = mapped_column(Integer)
    latency_ms: Mapped[int | None] = mapped_column(Integer)
    pred_home_goals: Mapped[float | None] = mapped_column(Float)
    pred_away_goals: Mapped[float | None] = mapped_column(Float)
    # 备选比分(次可能比分,可空)
    alt_pred_home_goals: Mapped[int | None] = mapped_column(Integer)
    alt_pred_away_goals: Mapped[int | None] = mapped_column(Integer)
    pred_1x2: Mapped[str | None] = mapped_column(String(3))
    subjective_confidence: Mapped[float | None] = mapped_column(Float)  # LLM 主观置信度,非概率
    reasoning: Mapped[str | None] = mapped_column(Text)
    raw_response: Mapped[dict | None] = mapped_column(JSONB)
    # multi-agent 模式: 各专家报告
    mode: Mapped[str] = mapped_column(String(20), nullable=False, default="single")
    # D5: multi-agent 模式存各专家报告列表(list[dict]);历史数据/兼容路径可能存 dict。
    # 仅修正类型标注与真实 JSON 形状一致,列类型(JSONB)与数据不变。
    agent_outputs: Mapped[list[dict] | dict | None] = mapped_column(JSONB)
    # Fix: agent_weights 独立持久化到列(原本只在 raw_response 中)
    agent_weights: Mapped[dict | None] = mapped_column(JSONB)
    # 预测状态: success / failed / degraded
    status: Mapped[str] = mapped_column(String(20), nullable=False, default="success")
    # Fix: run_type 区分实盘(live)与回测(backtest),避免回测覆盖实盘预测
    run_type: Mapped[str] = mapped_column(String(10), nullable=False, default="live")
    # 时间语义:区分比赛时间、预测创建时间、数据截止时间
    match_kickoff_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    prediction_created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow)
    prediction_cutoff_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    input_hash: Mapped[str | None] = mapped_column(String(64))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow)
    actual_home_goals: Mapped[int | None] = mapped_column(Integer)
    actual_away_goals: Mapped[int | None] = mapped_column(Integer)
    settled: Mapped[bool] = mapped_column(Boolean, default=False)

    match: Mapped[Match] = relationship(back_populates="predictions")

    __table_args__ = (
        # P0-03: 幂等指纹——input_hash 非空时唯一(同指纹→返回已有行,不 UPDATE/INSERT);
        # 兼容旧数据 NULL input_hash(不强制回填)。
        Index(
            "ix_predictions_input_hash_unique", "input_hash", unique=True,
            postgresql_where=column("input_hash").isnot(None),
        ),
        Index("ix_predictions_match", "match_id"),
        # 数据截止时间过滤查询用(按 prediction_cutoff_at 取「赛前已生成」的预测)
        Index("ix_predictions_cutoff_at", "prediction_cutoff_at"),
        # 数据库级约束:最后一道防线
        CheckConstraint("pred_home_goals >= 0", name="ck_pred_home_goals_nonneg"),
        CheckConstraint("pred_away_goals >= 0", name="ck_pred_away_goals_nonneg"),
        CheckConstraint("subjective_confidence >= 0 AND subjective_confidence <= 1", name="ck_confidence_range"),
        CheckConstraint("pred_1x2 IN ('1', 'X', '2')", name="ck_pred_1x2_enum"),
        CheckConstraint("mode IN ('single', 'multi', 'baseline')", name="ck_mode_enum"),
        CheckConstraint("status IN ('success', 'failed', 'degraded')", name="ck_status_enum"),
        CheckConstraint("run_type IN ('live', 'backtest')", name="ck_run_type_enum"),
    )


class AppSetting(Base):
    """后台管理的运行时设置(如数据源 API Key),读取时优先于 .env 默认值。"""
    __tablename__ = "app_settings"

    key: Mapped[str] = mapped_column(String(100), primary_key=True)
    value: Mapped[str] = mapped_column(Text, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow, onupdate=_utcnow)


class Schedule(Base):
    """定时采集任务配置。"""
    __tablename__ = "schedules"

    id: Mapped[str] = mapped_column(String(50), primary_key=True)
    task: Mapped[str] = mapped_column(String(20), nullable=False)  # events / standings / stats / all
    cron: Mapped[str] = mapped_column(String(100), nullable=False)  # cron 表达式
    leagues: Mapped[str | None] = mapped_column(Text)  # 逗号分隔的联赛代码,空=全部
    enabled: Mapped[bool] = mapped_column(Boolean, default=True)
    last_run_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    last_status: Mapped[str | None] = mapped_column(String(20))  # success / failed
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=_utcnow, onupdate=_utcnow)


# ── 数据管线基础设施(对应迁移 0008) ──────────────────────────────────
# Bronze 层、死信、质量监控、血缘追踪 4 张表。


class RawEvent(Base):
    """Bronze 层:采集到的原始事件存档,便于重放与审计。

    ⚠️ 预留未启用:当前 bzzoiro 管线不写入此表。
    未来接线计划:events 采集成功后写入 raw_payload,支持重放与审计。
    """
    __tablename__ = "raw_events"

    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
    source_system: Mapped[str] = mapped_column(String(50), nullable=False)
    source_record_id: Mapped[str] = mapped_column(String(100), nullable=False)
    raw_payload: Mapped[dict] = mapped_column(JSONB, nullable=False)
    ingested_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    ingest_batch_id: Mapped[str | None] = mapped_column(String(36))

    __table_args__ = (
        UniqueConstraint("source_system", "source_record_id", name="uq_raw_event"),
        Index("ix_raw_event_batch", "ingest_batch_id"),
    )


class IngestJob(Base):
    """采集任务状态:跟踪每次触后台采集任务的执行进度与结果。

    POST /api/v1/ingest/bzzoiro 触发时写入(pending→running→success/failed),
    前端 Collection 页据此轮询到终态,替代此前"30 秒后盲标完成"的模拟。
    分批 get_uow / BzzoiroSource / IngestFailure / Bronze/Lineage 均不受影响
    (本表仅作状态追踪,不介入采集事务)。
    """
    __tablename__ = "ingest_jobs"

    id: Mapped[str] = mapped_column(String(36), primary_key=True)  # uuid4
    task: Mapped[str] = mapped_column(String(20), nullable=False)
    params: Mapped[dict] = mapped_column(JSONB, nullable=False, default=dict)
    status: Mapped[str] = mapped_column(String(20), nullable=False, server_default="pending")
    result: Mapped[dict | None] = mapped_column(JSONB)
    error: Mapped[str | None] = mapped_column(Text)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    started_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    finished_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))

    __table_args__ = (
        Index("ix_ingest_job_status_created", "status", "created_at"),
        CheckConstraint(
            "status IN ('pending', 'running', 'success', 'failed')",
            name="ck_ingest_job_status",
        ),
    )


class IngestFailure(Base):
    """采集失败死信:记录失败原因、重试次数与下次重试时间。

    bzzoiro 三条管线(events / standings / stats)抓取失败时经由
    bzzoiro._safe_write_ingest_failure 写入本表(尽力而为,写入失败
    不影响采集主流程)。admin 可通过 /admin/schedules/ingest-failures
    查看与重试。
    """
    __tablename__ = "ingest_failures"

    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
    source_system: Mapped[str] = mapped_column(String(50), nullable=False)
    entity_type: Mapped[str] = mapped_column(String(50), nullable=False)
    source_record_id: Mapped[str | None] = mapped_column(String(100))
    error_type: Mapped[str] = mapped_column(String(50), nullable=False)
    error_detail: Mapped[str | None] = mapped_column(Text)
    raw_payload: Mapped[dict | None] = mapped_column(JSONB)
    retry_count: Mapped[int] = mapped_column(Integer, server_default="0")
    next_retry_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    status: Mapped[str] = mapped_column(String(20), server_default="pending")
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    resolved_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))

    __table_args__ = (
        Index("ix_ingest_failure_status", "status", "next_retry_at"),
        CheckConstraint(
            "status IN ('pending', 'retrying', 'resolved', 'abandoned')",
            name="ck_ingest_failure_status",
        ),
    )


class DataQualityCheck(Base):
    """数据质量监控:记录每次质量检查的结果。

    ⚠️ 预留未启用:当前 bzzoiro 管线不写入此表。
    未来接线计划:定时检查比赛/统计/积分榜完整性,写入检查结果。
    """
    __tablename__ = "data_quality_checks"

    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
    check_name: Mapped[str] = mapped_column(String(100), nullable=False)
    entity_type: Mapped[str] = mapped_column(String(50), nullable=False)
    entity_id: Mapped[int | None] = mapped_column(Integer)
    expected_value: Mapped[float | None] = mapped_column(Float)
    actual_value: Mapped[float] = mapped_column(Float, nullable=False)
    passed: Mapped[bool] = mapped_column(Boolean, nullable=False)
    severity: Mapped[str] = mapped_column(String(10), server_default="warning")
    detail: Mapped[dict | None] = mapped_column(JSONB)
    checked_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    __table_args__ = (
        Index("ix_dqc_checked_at", "checked_at"),
        Index("ix_dqc_entity", "entity_type", "entity_id"),
    )


class DataLineage(Base):
    """ETL 血缘追踪:记录从源到目标的转换过程。

    ⚠️ 预留未启用:当前 bzzoiro 管线不写入此表。
    未来接线计划:每次采集写入 source_record_id → target_table/id 映射。
    """
    __tablename__ = "data_lineage"

    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
    source_system: Mapped[str] = mapped_column(String(50), nullable=False)
    source_record_id: Mapped[str] = mapped_column(String(100), nullable=False)
    target_table: Mapped[str] = mapped_column(String(50), nullable=False)
    target_id: Mapped[int | None] = mapped_column(Integer)
    transform_name: Mapped[str] = mapped_column(String(50), nullable=False)
    transform_detail: Mapped[dict | None] = mapped_column(JSONB)
    batch_id: Mapped[str | None] = mapped_column(String(36))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    __table_args__ = (
        Index("ix_lineage_source", "source_system", "source_record_id"),
        Index("ix_lineage_target", "target_table", "target_id"),
        Index("ix_lineage_batch", "batch_id"),
    )