first commit

src/notifications/models.py

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+from typing import Any, Literal
+
+from pydantic import BaseModel, Field
+
+
+class NotificationEvent(BaseModel):
+    event_type: str
+    title: str
+    content_text: str
+    severity: Literal["info", "warning", "error"] = "info"
+    metadata: dict[str, Any] = Field(default_factory=dict)