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app/schemas/tag.py

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+from pydantic import BaseModel, Field
+from datetime import datetime
+from typing import Optional
+
+
+class TagBase(BaseModel):
+    name: str = Field(..., min_length=1, max_length=100, description="Tag name")
+    description: Optional[str] = Field(None, description="Tag description")
+    color: Optional[str] = Field(None, pattern="^#[0-9A-Fa-f]{6}$", description="Hex color code (e.g., #FF5733)")
+
+
+class TagCreate(TagBase):
+    pass
+
+
+class TagUpdate(BaseModel):
+    name: Optional[str] = Field(None, min_length=1, max_length=100, description="Tag name")
+    description: Optional[str] = Field(None, description="Tag description")
+    color: Optional[str] = Field(None, pattern="^#[0-9A-Fa-f]{6}$", description="Hex color code")
+
+
+class TagResponse(TagBase):
+    id: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True