baseline: 批次A-D 成果 + membership 半成品（测试红）

2026-09-11 23:11:35 +08:00
commit b3f3095d53
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+"""消息通知与智能预警模型：
+1. Notification 站内消息/通知
+2. AlertRule 业务预警规则（库存低限预警、应收账款逾期催收预警等）
+"""
+
+from django.conf import settings
+from django.db import models
+from apps.core.base_models import TenantScopedModel
+
+
+class Notification(TenantScopedModel):
+    """消息通知。"""
+
+    CATEGORY_CHOICES = [
+        ("info", "系统通知"),
+        ("warning", "业务预警"),
+        ("error", "异常提醒"),
+        ("audit", "审批待办"),
+    ]
+
+    recipient = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        blank=True,
+        on_delete=models.CASCADE,
+        related_name="notifications",
+        help_text="接收人（为空表示租户内广播）",
+    )
+    title = models.CharField(max_length=128)
+    content = models.TextField()
+    category = models.CharField(max_length=16, choices=CATEGORY_CHOICES, default="info")
+    link = models.CharField(max_length=255, blank=True, default="", help_text="跳转路由")
+    is_read = models.BooleanField(default=False)
+    read_at = models.DateTimeField(null=True, blank=True)
+    extra_data = models.JSONField(default=dict, blank=True)
+
+    class Meta:
+        db_table = "notify_notification"
+        indexes = [
+            models.Index(fields=["tenant", "recipient", "is_read"]),
+            models.Index(fields=["tenant", "-created_at"]),
+        ]
+        ordering = ["-created_at"]
+
+    def __str__(self):
+        return f"[{self.get_category_display()}] {self.title} (已读: {self.is_read})"
+
+
+class AlertRule(TenantScopedModel):
+    """业务预警规则配置。"""
+
+    RULE_TYPE_CHOICES = [
+        ("inventory_low", "库存缺货/下限预警"),
+        ("receivable_overdue", "应收账款逾期催款预警"),
+        ("stock_backlog", "商品呆滞积压预警"),
+        ("batch_expiry", "批次近效期预警"),
+        ("risk_score", "AI 应收风险预警（threshold=风险分数线）"),
+    ]
+
+    code = models.CharField(max_length=64, help_text="规则代码")
+    name = models.CharField(max_length=128, help_text="预警规则名称")
+    rule_type = models.CharField(max_length=32, choices=RULE_TYPE_CHOICES)
+    threshold = models.DecimalField(max_digits=18, decimal_places=4, default=10, help_text="预警阈值（如天数或数量）")
+    is_enabled = models.BooleanField(default=True)
+    channels = models.JSONField(default=list, blank=True, help_text="通知渠道 ['in_app', 'webhook']")
+
+    class Meta:
+        db_table = "notify_alert_rule"
+        unique_together = [("tenant", "code")]
+        verbose_name_plural = "业务预警规则"
+        ordering = ["code"]
+
+    def __str__(self):
+        return f"{self.name} (阈值: {self.threshold}) [{ '启用' if self.is_enabled else '停用' }]"