Update code

schemas.py

@@ -21,14 +21,14 @@ class SourceType(str, Enum):
 
 class RetrievedEvidence(BaseModel):
     source_type: SourceType
-    title: str
-    snippet: str
+    title: str = Field(..., min_length=1)
+    snippet: str = Field(..., min_length=1)
     url: Optional[str] = None
     score: Optional[float] = None
 
 
 class ResponseMeta(BaseModel):
-    used_model: str
+    used_model: str = Field(..., min_length=1)
     fallback_used: bool = False
     retrieval_used: bool = False
     source_count: int = 0
@@ -49,7 +49,7 @@ class CodeXRequest(BaseModel):
 
 
 class CodeXResponse(BaseModel):
-    answer: str
+    answer: str = Field(..., min_length=1)
     task_type: CodeTaskType
     code_output: Optional[str] = None
     explanation: Optional[str] = None