use cached prompt generation (#768)

Co-authored-by: Shuchang Zheng <wintonzheng0325@gmail.com>

skyvern/forge/sdk/schemas/task_generations.py

@@ -1,7 +1,7 @@
 from datetime import datetime
 from typing import Any
 
-from pydantic import BaseModel, ConfigDict
+from pydantic import BaseModel, ConfigDict, Field
 
 
 class TaskGenerationBase(BaseModel):
@@ -9,6 +9,7 @@ class TaskGenerationBase(BaseModel):
 
     organization_id: str | None = None
     user_prompt: str | None = None
+    user_prompt_hash: str | None = None
     url: str | None = None
     navigation_goal: str | None = None
     navigation_payload: dict[str, Any] | None = None
@@ -20,19 +21,16 @@ class TaskGenerationBase(BaseModel):
     suggested_title: str | None = None
 
 
-class TaskGenerationCreate(TaskGenerationBase):
-    organization_id: str
-    user_prompt: str
-
-
 class TaskGeneration(TaskGenerationBase):
     task_generation_id: str
     organization_id: str
     user_prompt: str
+    user_prompt_hash: str
 
     created_at: datetime
     modified_at: datetime
 
 
 class GenerateTaskRequest(BaseModel):
-    prompt: str
+    # prompt needs to be at least 1 character long
+    prompt: str = Field(..., min_length=1)