feat(platform): 首页轮播 feed 接入真实数据 + 三统计配置增强
轮播 feed(marquee_seed,全新): - 新增 marquee_seed 表 + admin CRUD/批量生成/预览;真实比价记录(success 且 0<省额≤300元、按 user 去重)优先,种子兜底混播 - 种子为「生成规则」:用户名可空(空则按脱敏格式随机合成、避开同屏撞名),金额改 [min,max] 区间随机,feed 公平随机抽取(不看 sort_order) - 新增 GET /api/v1/platform/savings-feed(无鉴权);展示时间统一刷新为相对当前的最近时刻 三统计配置(platform_stat_display)增强: - 自增长新增「绝对增量」方式(random_kind=add,每周期 +[step_min,step_max]) - 真实值模式加基数偏移(real_offset,展示=真实+偏移) - 只增不减护栏(allow_decrease 默认关,real/manual 不回退防门面缩水) - 累计节省 real 口径只计 0<单条≤300元防虚高;倍率上限 5.0→1.5;PATCH 支持 apply_now 立即更新 迁移:marquee_seed_table / marquee_seed_range / platform_stat_growth_offset(均可逆,已验证) 文档:API/DB 对应文档同步更新 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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@@ -20,7 +20,7 @@ from __future__ import annotations
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from datetime import datetime
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from sqlalchemy import DateTime, Integer, String, func
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from sqlalchemy import Boolean, DateTime, Integer, String, func
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from sqlalchemy.orm import Mapped, mapped_column
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from app.db.base import Base
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@@ -49,6 +49,15 @@ class PlatformStatDisplay(Base):
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DateTime(timezone=True), nullable=True
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)
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# random 增长方式:mult=×倍率(用 random_mult_*) / add=+绝对增量(用 random_step_*,基础单位整数)
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random_kind: Mapped[str] = mapped_column(String(8), nullable=False, default="mult")
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random_step_min: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
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random_step_max: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
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# real 模式基数偏移(基础单位;total_saved 为分):展示值 = 真实值 + 偏移(冷启动期既真实又体面)
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real_offset: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
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# 门面数字默认「只增不减」;运营明确要下调时才开此开关(real/manual 刷新都受护栏约束)
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allow_decrease: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
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updated_by_admin_id: Mapped[int | None] = mapped_column(Integer, nullable=True)
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updated_at: Mapped[datetime] = mapped_column(
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DateTime(timezone=True),
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