first commit

app/models.py

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+from datetime import datetime
+
+from pydantic import BaseModel, Field
+
+
+class WeatherDataIn(BaseModel):
+    """Payload accepted by POST /data."""
+
+    station_name: str = Field(..., description="Name of the weather station")
+    temperature: float | None = Field(None, description="Temperature in Celsius")
+    pressure: float | None = Field(None, description="Atmospheric pressure in hPa")
+    relative_humidity: float | None = Field(
+        None, description="Relative humidity in percent (0-100)"
+    )
+
+
+class WeatherRecordOut(BaseModel):
+    """Record returned by the API (includes server-assigned fields)."""
+
+    id: int
+    station_name: str
+    temperature: float | None
+    pressure: float | None
+    relative_humidity: float | None
+    received_at: datetime
+
+
+class WeatherHistoryResponse(BaseModel):
+    """Wrapper for history queries — always returns a list (empty if no data)."""
+
+    station_name: str
+    records: list[WeatherRecordOut]