refactor: modularize database management, models, and services for better structure and maintainability

backend/app/models.py

@@ -0,0 +1,50 @@
+from typing import TypedDict, List
+
+from pydantic import BaseModel
+
+
+class ArticleSummary(TypedDict):
+    """Type definition for article summary data returned from the LLM."""
+    title: str
+    summary_de: str
+    summary_en: str
+
+
+# Pydantic models for API requests and responses
+class CronSettings(BaseModel):
+    """Settings for the cron job that harvests news."""
+    hours: float
+
+
+class FeedData(BaseModel):
+    """Data for a news feed."""
+    country: str
+    url: str
+
+
+class ModelStatus(BaseModel):
+    """Status of the LLM model."""
+    name: str
+    status: str
+    available_models: List[str]
+
+
+class ErrorResponse(BaseModel):
+    """Standard error response."""
+    status: str
+    message: str
+
+
+class SuccessResponse(BaseModel):
+    """Standard success response."""
+    status: str
+
+
+class TimestampResponse(BaseModel):
+    """Response containing a timestamp."""
+    ts: int
+
+
+class HoursResponse(BaseModel):
+    """Response containing hours setting."""
+    hours: float