2026-09-10 21:36:23 +08:00
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"""画像组装:中期记忆 → 长期事实 → 画像 + 版本快照。
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这是"记忆系统为画像服务"的落地环节。三段职责:
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1. **事实提升(中期 → 长期)**:把 `memory_unit` 里证据足够的记忆提炼进 `user_facts`。
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门槛是 `evidence_count >= 2` **或** `confidence >= 0.90` —— 这条门槛就是
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"客户随口一说不能变成画像结论"的落地方式。
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2. **画像组装(长期 → 画像)**:把 `user_facts` 按**白名单**映射进 `fin_customer_profile`。
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未列入白名单的事实只进 `user_facts`,不进画像,避免画像被噪声撑大。
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3. **版本留痕**:每次重建写一条 `profile_snapshots`,并用 `generation_basis` 记录
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**每个字段分别来自哪里**——风控与合规复盘时要能回答"当时凭什么这么判断"。
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## 两条必须由代码保证的红线
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- **`investor_type` 只来自问卷测评**(`fin_risk_assessment` 最新一条)。下面的实现里
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它只从问卷查询取数,任何记忆路径都碰不到它。客户在对话里说"我是激进型"不会改变它
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——这是合规底线,不能只靠约定。
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- **按字段所有权写入**:交易侧的客观字段(`total_asset`/`trading_frequency`/`behavior_score`)
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本服务**不写**,留给交易模块,避免两个模块抢写同一列。
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"""
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import json as _json
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from datetime import UTC, datetime
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from hashlib import sha256
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from typing import Any
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from uuid import uuid4
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from sqlalchemy import or_, select, text
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from sqlalchemy.ext.asyncio import AsyncSession
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from app.model.fund import FundCustomerProfile
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from app.model.memory import MemoryUnit
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from app.model.profile import ProfileSnapshot, UserFact
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# 提升门槛
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MIN_EVIDENCE = 2
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HIGH_CONFIDENCE = 0.90
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# 事实键 → 画像字段的**白名单**映射。没列在这里的事实(如 profile:family)只进 user_facts,
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# 不进画像字段——画像要保持"能直接支撑决策"的信噪比。
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FACT_TO_PROFILE_FIELD: dict[str, str] = {
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"preference:asset_class": "preferred_asset_class",
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"preference:horizon": "investment_horizon",
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}
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# 自述类事实(客户自己说的偏好)统一进 risk_tags,并标注来源为"自述"。
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# 保留它们的价值在于:当出现「问卷 C4 / 自述稳健 / 行为买 R4」三方不一致时,
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# 这种矛盾本身就是风控信号——但绝不能与问卷等级混进同一个字段。
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SELF_REPORTED_PREFIXES = ("preference:risk_level", "preference:", "profile:")
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# 关键事实:参与决策,标记出来便于下游优先读取
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CRITICAL_FACTS = frozenset({
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"preference:risk_level", "preference:horizon", "preference:asset_class",
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})
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# 画像中允许本服务写入的字段(其余字段归交易/注册侧所有)
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PROFILE_OWNED_FIELDS = ("investor_type", "preferred_asset_class", "investment_horizon", "risk_tags")
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def _now() -> datetime:
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return datetime.now(UTC).replace(tzinfo=None)
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def _fact_id() -> int:
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"""`user_facts.id` 没有 auto_increment,主键由应用生成。
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用微秒时间戳:单调递增、无需额外序列、同客户同微秒重复在单进程写入下不可能发生。
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"""
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return int(datetime.now(UTC).timestamp() * 1_000_000)
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class ProfileAssemblyService:
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def __init__(self, session: AsyncSession) -> None:
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self.session = session
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# ---------- 中期 → 长期 ----------
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async def promote_facts(self, customer_id: int) -> list[str]:
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"""把证据足够的记忆提炼为长期事实;返回本次提升的事实键。"""
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now = _now()
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rows = list(await self.session.scalars(
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select(MemoryUnit).where(
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MemoryUnit.customer_id == customer_id,
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MemoryUnit.status == "active",
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or_(
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MemoryUnit.evidence_count >= MIN_EVIDENCE,
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MemoryUnit.confidence >= HIGH_CONFIDENCE,
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),
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or_(MemoryUnit.valid_until.is_(None), MemoryUnit.valid_until > now),
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)
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))
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promoted: list[str] = []
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for memory in rows:
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key = str(memory.memory_key)
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value = self._fact_value(memory)
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existing = await self.session.scalar(
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select(UserFact).where(
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UserFact.customer_id == customer_id, UserFact.fact_key == key
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)
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)
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if existing is None:
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self.session.add(UserFact(
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# 主键显式赋值:该表无 auto_increment
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id=_fact_id(),
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customer_id=customer_id,
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fact_key=key,
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fact_value=value,
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source_portal=str(memory.source_type or "conversation"),
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source_episode_id=None,
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confidence=float(memory.confidence or 0.0),
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is_critical=key in CRITICAL_FACTS,
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created_at=now,
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))
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else:
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existing.fact_value = value
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existing.confidence = float(memory.confidence or 0.0)
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existing.is_critical = key in CRITICAL_FACTS
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promoted.append(key)
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await self.session.flush()
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return promoted
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@staticmethod
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def _fact_value(memory: MemoryUnit) -> Any:
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"""事实值优先取结构化值,回退到正文;始终以 JSON 可存的形式返回。"""
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structured = memory.structured_value
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if isinstance(structured, dict) and "value" in structured:
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return structured["value"]
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if structured is not None:
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return structured
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return memory.content or ""
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# ---------- 长期 → 画像 ----------
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async def rebuild_profile(self, customer_id: int) -> dict[str, Any]:
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"""用长期事实 + 问卷重建画像,并写一条版本快照。"""
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now = _now()
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facts = list(await self.session.scalars(
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select(UserFact).where(UserFact.customer_id == customer_id)
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))
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assessment = (await self.session.execute(text(
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"""
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SELECT investor_type, questionnaire_version, assessed_at, valid_until
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FROM fin_risk_assessment
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WHERE customer_id = :customer_id
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ORDER BY assessed_at DESC, id DESC
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LIMIT 1
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"""
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), {"customer_id": customer_id})).first()
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values: dict[str, Any] = {}
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basis: dict[str, Any] = {}
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# 红线:风险等级只从问卷取;记忆里哪怕有 preference:risk_level 也不写这个字段
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if assessment is not None and assessment[0]:
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values["investor_type"] = str(assessment[0])
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basis["investor_type"] = {
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"source": "fin_risk_assessment",
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"questionnaire_version": assessment[1],
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"assessed_at": str(assessment[2]),
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"valid_until": str(assessment[3]),
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}
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tags: list[str] = []
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for fact in facts:
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key = str(fact.fact_key)
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field = FACT_TO_PROFILE_FIELD.get(key)
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if field is not None:
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values[field] = self._as_text(fact.fact_value)
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basis[field] = {
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"source": "user_facts", "fact_key": key,
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"confidence": float(fact.confidence or 0.0),
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}
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elif key.startswith(SELF_REPORTED_PREFIXES):
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# 自述信息进标签,并显式标注"自述",与问卷等级区分开
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tags.append(f"自述:{key}={self._as_text(fact.fact_value)}")
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basis.setdefault("risk_tags", {"source": "user_facts", "items": []})
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basis["risk_tags"]["items"].append(key)
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if tags:
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values["risk_tags"] = ";".join(tags)
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profile = await self.session.get(FundCustomerProfile, customer_id)
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if profile is None:
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# 画像行由开户流程创建:`trade_account` 等身份字段在库里是 NOT NULL,属注册/账户侧
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# 所有。本服务不代替开户去造这些数据——否则会写出一条**假的**开户记录,
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# 而画像恰恰是风控要读的东西,假数据比没有数据更危险。未开户时如实报告。
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return {
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"profile": None,
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"reason": "profile_row_not_opened",
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"generation_basis": basis,
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"promoted": len(facts),
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}
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for field in PROFILE_OWNED_FIELDS:
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2026-09-10 21:58:42 +08:00
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if field == "investor_type":
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# 问卷是唯一权威:本轮没有问卷记录时**保持原值**(既不写入也不清空)。
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# 否则重测前的空档会把开户时的等级抹掉,而该列是 NOT NULL。
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if field in values:
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setattr(profile, field, values[field])
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continue
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# 其余字段由本服务独占:本轮没有对应事实即清空。
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# 这不只是洁癖——记忆失效后若不清理,画像会留着一个已经作废的投资期限,
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# 投顾据此给建议,而客户从未授权这条信息继续生效(实测踩到过)。
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setattr(profile, field, values.get(field))
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2026-09-10 21:36:23 +08:00
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profile.updated_at = now
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await self.session.flush()
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snapshot = {
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**{field: getattr(profile, field, None) for field in PROFILE_OWNED_FIELDS},
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"generated_at": now.isoformat(),
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}
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await self._write_snapshot(customer_id, snapshot, basis, now)
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return {"profile": snapshot, "generation_basis": basis, "promoted": len(facts)}
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@staticmethod
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def _as_text(value: Any) -> str:
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"""把 JSON 列里取出的值渲染成可读字符串。
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字符串类型的值可能带着 JSON 序列化时的外层引号(取决于驱动如何回读 JSON 列),
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这里去掉它们——`risk_tags` 是给风控与投顾看的,多一对引号会让人以为值本身包含引号。
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"""
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if isinstance(value, str):
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return value.strip().strip('"')
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return _json.dumps(value, ensure_ascii=False)
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async def _write_snapshot(
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self, customer_id: int, snapshot: dict[str, Any], basis: dict[str, Any], now: datetime
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) -> None:
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"""写入新版本快照并把旧版本置为非当前。
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唯一键 `uk_profile_snapshot_current` 建立在生成列 `current_customer_id` 上,
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保证「每个客户最多一条 current」;因此必须先清旧再写新,顺序不能反。
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"""
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previous = list(await self.session.scalars(
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select(ProfileSnapshot).where(
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ProfileSnapshot.customer_id == customer_id, ProfileSnapshot.is_current.is_(True)
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)
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))
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for row in previous:
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row.is_current = False
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row.updated_at = now
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await self.session.flush()
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latest = await self.session.scalar(text(
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"SELECT COALESCE(MAX(version), 0) FROM profile_snapshots WHERE customer_id = :cid"
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), {"cid": customer_id})
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version = int(latest or 0) + 1
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payload = _json.dumps(snapshot, ensure_ascii=False, sort_keys=True)
|
|
|
|
|
|
self.session.add(ProfileSnapshot(
|
|
|
|
|
|
profile_uuid=str(uuid4()),
|
|
|
|
|
|
customer_id=customer_id,
|
|
|
|
|
|
version=version,
|
|
|
|
|
|
snapshot=snapshot,
|
|
|
|
|
|
generation_basis=basis,
|
|
|
|
|
|
snapshot_hash=sha256(payload.encode("utf-8")).hexdigest(),
|
|
|
|
|
|
is_current=True,
|
|
|
|
|
|
generated_at=now,
|
|
|
|
|
|
created_at=now,
|
|
|
|
|
|
updated_at=now,
|
|
|
|
|
|
))
|
|
|
|
|
|
await self.session.flush()
|
|
|
|
|
|
|
|
|
|
|
|
# ---------- 完整链路 ----------
|
|
|
|
|
|
|
|
|
|
|
|
async def rebuild(self, customer_id: int) -> dict[str, Any]:
|
|
|
|
|
|
promoted = await self.promote_facts(customer_id)
|
|
|
|
|
|
outcome = await self.rebuild_profile(customer_id)
|
|
|
|
|
|
outcome["promoted_keys"] = promoted
|
|
|
|
|
|
return outcome
|