feat(phase-4b): backend business-logic, 8 entities, 32 endpoints, 58 tests

app/schemas/common.py

@@ -0,0 +1,30 @@
+"""Common Pydantic schemas: pagination."""
+
+from __future__ import annotations
+
+from typing import Generic, List, Optional, TypeVar
+
+from pydantic import BaseModel, ConfigDict, Field
+
+T = TypeVar("T")
+
+
+class PaginationParams(BaseModel):
+    """Standard pagination query params."""
+
+    skip: int = Field(default=0, ge=0)
+    limit: int = Field(default=20, ge=1, le=100)
+
+
+class PaginatedResponse(BaseModel, Generic[T]):
+    """Generic paginated response."""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    items: List[T]  # type: ignore[valid-type]
+    total: int
+    skip: int
+    limit: int
+
+
+__all__ = ["PaginatedResponse", "PaginationParams"]