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models/__init__.py

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+"""
+Models package.
+"""

models/schemas.py

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+"""
+models/schemas.py
+Pydantic response schemas for FastAPI automatic OpenAPI documentation.
+"""
+
+from datetime import datetime, timezone
+
+from pydantic import BaseModel, Field
+
+from config.constants import API_VERSION
+
+
+class HealthResponse(BaseModel):
+    status: str = Field(..., json_schema_extra={"example": "healthy"})
+    engine: str = Field(..., json_schema_extra={"example": "rembg-silueta"})
+    model_loaded: bool = Field(..., json_schema_extra={"example": True})
+    timestamp: str = Field(
+        default_factory=lambda: datetime.now(timezone.utc).isoformat(),
+        json_schema_extra={"example": "2025-01-01T00:00:00+00:00"}
+    )
+
+
+class RootResponse(BaseModel):
+    name: str = "Background Remover API"
+    version: str = API_VERSION
+    status: str = "running"
+
+
+class ErrorResponse(BaseModel):
+    detail: str = Field(..., json_schema_extra={"example": "Unsupported image format."})