feat: Introduce generation grouping, enabling multiple generations per request via a new count parameter and retrieval by group ID.

repos/generation_repo.py

@@ -77,3 +77,11 @@ class GenerationRepo:
 
     async def update_generation(self, generation: Generation, ):
         res = await self.collection.update_one({"_id": ObjectId(generation.id)}, {"$set": generation.model_dump()})
+
+    async def get_generations_by_group(self, group_id: str) -> List[Generation]:
+        res = await self.collection.find({"generation_group_id": group_id, "is_deleted": False}).sort("created_at", 1).to_list(None)
+        generations: List[Generation] = []
+        for generation in res:
+            generation["id"] = str(generation.pop("_id"))
+            generations.append(Generation(**generation))
+        return generations