Requesting > 1 reports in parallel can lead to reports overwriting each other

[agross]

Description

I've been running tests in parallel against our Solidtime instance, requesting PDF reports. Under certain timing circumstances, reports overwrite each other.

For example, the first parallel test requested this:

/api/v1/organizations/e9bb8975-82f5-43a2-bfb6-563352013582/time-entries/export?start=2026-01-04T23%3A00%3A00Z&end=2026-01-11T22%3A59%3A59Z&format=pdf&client_ids%5B%5D=ac90a870-1484-4118-a38f-e854a873be88&member_ids%5B%5D=2ea0e0e5-ba8d-45f3-8602-304a0282639f&project_ids%5B%5D=e11332c4-2912-43d9-8337-87a09d68df6d

and got this report download URL:

https://solidtime.example.com/storage/exports/time-entries-export-2026-03-10_14-44-23.pdf?expires=1773154164&signature=2df580d679dc4b3534c63b660587c585822dfbfa1daeef4009191c459fee4949

While in parallel, another test requested this (no project_ids as opposed to the first request):

/api/v1/organizations/e9bb8975-82f5-43a2-bfb6-563352013582/time-entries/export?start=2026-01-04T23%3A00%3A00Z&end=2026-01-11T22%3A59%3A59Z&format=pdf&client_ids%5B%5D=ac90a870-1484-4118-a38f-e854a873be88&member_ids%5B%5D=2ea0e0e5-ba8d-45f3-8602-304a0282639f

and got this download URL, which is the same as above:

https://solidtime.example.com/storage/exports/time-entries-export-2026-03-10_14-44-23.pdf?expires=1773154164&signature=2df580d679dc4b3534c63b660587c585822dfbfa1daeef4009191c459fee4949

Naming the PDF files with second precision leads to the second request overwriting the first request's PDF.

Steps To Reproduce

1. Request 2 reports of the same kind but with different parameters in the same second.

Self-hosted or Cloud?

Self-Hosted

Version of solidtime: (for self-hosted)

0.11.5

solidtime self-hosting guide: (for self-hosted)

Official