High resource usage over time (memory leak?)

[TruncatedDinoSour]

Background information

• Dendrite version or git SHA: 0.13.8+79b87c7
• SQLite3 or Postgres?: Postgres
• Running in Docker?: No
• go version: go version go1.23.0 linux/amd64
• Client used (if applicable): Schildichat, Element, Hydrogen, or CinnyChat is what most people use I believe on the HS

Description

• What is the problem: Dendrite, when running over time, begins hogging ram over time. This results in not only a big RAM hog, but also a CPU hog, since I run zRAM (maybe also related to dendrite using the CPU? Idk.) Regardless, every week or so I have to restart Dendrite because it keeps eating more and more RAM, making the overall server performance worse.
• Who is affected: The server.
• How is this bug manifesting: It appears as Dendrite runs in long-term, slowly eating more and more RAM and/or swap.
• When did this first appear: I can't recall. I don't remember needing to restart dendrite before 1.18 I think.

Steps to reproduce

• list the steps
• that reproduce the bug
• using hyphens as bullet points

• Run dendrite
• Use it for a week or so
• Watch the resource, mainly RAM, usage grow over time

This is its resource usage only 2 days later after its most recent restart. And it only creeps over time until I restart it:

It's weird.

[TruncatedDinoSour]

Had to restart it again. Could only last 3 days.