type SyncOperation<TRow, TKey, TInsertInput> = 
  | {
  data: TInsertInput | TInsertInput[];
  type: "insert";
}
  | {
  data: Partial<TRow> | Partial<TRow>[];
  type: "update";
}
  | {
  key: TKey | TKey[];
  type: "delete";
}
  | {
  data: Partial<TRow> | Partial<TRow>[];
  type: "upsert";
};

type SyncOperation<TRow, TKey, TInsertInput> = 
  | {
  data: TInsertInput | TInsertInput[];
  type: "insert";
}
  | {
  data: Partial<TRow> | Partial<TRow>[];
  type: "update";
}
  | {
  key: TKey | TKey[];
  type: "delete";
}
  | {
  data: Partial<TRow> | Partial<TRow>[];
  type: "upsert";
};