Endless "IN_QUEUE" status when generating image with sdxl-base

Hello,
I'm experiencing an issue where the txt2img endpoint using the sdxl-base model stays in "IN_QUEUE" status indefinitely. The job never progresses to "IN_PROGRESS" or "COMPLETED".

Here are sample log messages:

sql
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2025-06-16 13:02:51.527 INFO get_image: Current status: IN_QUEUE. Waiting 10 seconds...
2025-06-16 13:03:01.986 INFO get_image: Current status: IN_QUEUE. Waiting 10 seconds...
2025-06-16 13:03:12.415 INFO get_image: Current status: IN_QUEUE. Waiting 10 seconds...
... and it goes on like this for several minutes.
My request payload:

json
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{
"model": "sdxl-base",
"prompt": "Draw a background image with a headline about the news: [some prompt]",
"aspect_ratio": "landscape",
"guidance_scale": 12,
"style": "photorealistic",
"samples": 1
}
The request is accepted and I receive a process_id and status_url, but polling the status_url always returns "IN_QUEUE".

Is there currently a queue overload or an issue with the model backend?

Thanks in advance!